feat(plan): Add DAG types and validation for Conductor

Phase 1 of Conductor integration - DAG-based plan execution support:

Types:
- Add StepExecutionResult enum (Success, Failed, Skipped, Pending, InProgress)
- Add SkipReason enum for tracking why steps were skipped
- Add PauseReason enum for execution pause states
- Add DagValidationResult enum for validation outcomes

PlanStep extensions:
- Add depends_on: Vec<String> for explicit step dependencies
- Add execution_result: Option<StepExecutionResult> for tracking
- Add retry_count: u8 for failure retry tracking

AccumulatedPlanStatus extensions:
- Add ExecutingParallel { active_count, remaining } variant
- Add Paused(PauseReason) variant
- Add Aborted { reason } variant

DAG validation (Kahn's algorithm):
- validate_dag() returns execution order with parallelism levels
- Detects cycles and missing dependencies
- dependencies_satisfied() checks if step can execute
- get_ready_steps() returns executable steps
- skip_with_dependents() cascades failure through graph

Tests: 12 new DAG validation tests covering chains, parallelism,
diamonds, cycles, missing deps, and skip cascading.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.cargo/config.toml

@@ -1,20 +0,0 @@
-[target.x86_64-unknown-linux-musl]
-linker = "x86_64-linux-gnu-gcc"
-rustflags = ["-C", "target-feature=+crt-static", "-C", "link-arg=-lgcc"]
-
-[target.aarch64-unknown-linux-gnu]
-linker = "aarch64-linux-gnu-gcc"
-
-[target.aarch64-unknown-linux-musl]
-linker = "aarch64-linux-gnu-gcc"
-rustflags = ["-C", "target-feature=+crt-static", "-C", "link-arg=-lgcc"]
-
-[target.armv7-unknown-linux-gnueabihf]
-linker = "arm-linux-gnueabihf-gcc"
-
-[target.armv7-unknown-linux-musleabihf]
-linker = "arm-linux-gnueabihf-gcc"
-rustflags = ["-C", "target-feature=+crt-static", "-C", "link-arg=-lgcc"]
-
-[target.x86_64-pc-windows-gnu]
-linker = "x86_64-w64-mingw32-gcc"

.gitignore

@@ -1,9 +1,12 @@
+### Custom
+AGENTS.md
+CLAUDE.md
+
 ### Rust template
 # Generated by Cargo
 # will have compiled files and executables
 debug/
 target/
-dev/
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
@@ -15,17 +18,10 @@ Cargo.lock
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
 
-# RustRover
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
 ### JetBrains template
 # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
 # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
 
-.idea/
 # User-specific stuff
 .idea/**/workspace.xml
 .idea/**/tasks.xml
@@ -56,14 +52,15 @@ Cargo.lock
 # When using Gradle or Maven with auto-import, you should exclude module files,
 # since they will be recreated, and may cause churn.  Uncomment if using
 # auto-import.
-# .idea/artifacts
-# .idea/compiler.xml
-# .idea/jarRepositories.xml
-# .idea/modules.xml
-# .idea/*.iml
-# .idea/modules
-# *.iml
-# *.ipr
+.idea/artifacts
+.idea/compiler.xml
+.idea/jarRepositories.xml
+.idea/modules.xml
+.idea/*.iml
+.idea/modules
+*.iml
+*.ipr
+.idea
 
 # CMake
 cmake-build-*/
@@ -101,3 +98,8 @@ fabric.properties
 # Android studio 3.1+ serialized cache file
 .idea/caches/build_file_checksums.ser
 
+### rust-analyzer template
+# Can be generated by other build systems other than cargo (ex: bazelbuild/rust_rules)
+rust-project.json
+
+

.woodpecker.yml

@@ -1,109 +0,0 @@
-when:
-  event: tag
-  tag: v*
-
-variables:
-  - &rust_image 'rust:1.83'
-
-matrix:
-  include:
-    # Linux
-    - TARGET: x86_64-unknown-linux-gnu
-      ARTIFACT: owlen-linux-x86_64-gnu
-      PLATFORM: linux
-      EXT: ""
-    - TARGET: x86_64-unknown-linux-musl
-      ARTIFACT: owlen-linux-x86_64-musl
-      PLATFORM: linux
-      EXT: ""
-    - TARGET: aarch64-unknown-linux-gnu
-      ARTIFACT: owlen-linux-aarch64-gnu
-      PLATFORM: linux
-      EXT: ""
-    - TARGET: aarch64-unknown-linux-musl
-      ARTIFACT: owlen-linux-aarch64-musl
-      PLATFORM: linux
-      EXT: ""
-    - TARGET: armv7-unknown-linux-gnueabihf
-      ARTIFACT: owlen-linux-armv7-gnu
-      PLATFORM: linux
-      EXT: ""
-    - TARGET: armv7-unknown-linux-musleabihf
-      ARTIFACT: owlen-linux-armv7-musl
-      PLATFORM: linux
-      EXT: ""
-    # Windows
-    - TARGET: x86_64-pc-windows-gnu
-      ARTIFACT: owlen-windows-x86_64
-      PLATFORM: windows
-      EXT: ".exe"
-
-steps:
-  - name: install-deps
-    image: *rust_image
-    commands:
-      - apt-get update
-      - apt-get install -y musl-tools gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf gcc-mingw-w64-x86-64 zip
-
-  - name: build
-    image: *rust_image
-    commands:
-      - rustup target add ${TARGET}
-      - |
-        case "${TARGET}" in
-          aarch64-unknown-linux-gnu)
-            export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc
-            ;;
-          aarch64-unknown-linux-musl)
-            export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER=aarch64-linux-gnu-gcc
-            export CC_aarch64_unknown_linux_musl=aarch64-linux-gnu-gcc
-            ;;
-          armv7-unknown-linux-gnueabihf)
-            export CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc
-            ;;
-          armv7-unknown-linux-musleabihf)
-            export CARGO_TARGET_ARMV7_UNKNOWN_LINUX_MUSLEABIHF_LINKER=arm-linux-gnueabihf-gcc
-            export CC_armv7_unknown_linux_musleabihf=arm-linux-gnueabihf-gcc
-            ;;
-          x86_64-pc-windows-gnu)
-            export CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER=x86_64-w64-mingw32-gcc
-            ;;
-        esac
-      - cargo build --release --all-features --target ${TARGET}
-
-  - name: package
-    image: *rust_image
-    commands:
-      - mkdir -p dist
-      - |
-        if [ "${PLATFORM}" = "windows" ]; then
-          cp target/${TARGET}/release/owlen.exe dist/owlen.exe
-          cp target/${TARGET}/release/owlen-code.exe dist/owlen-code.exe
-          cd dist
-          zip -9 ${ARTIFACT}.zip owlen.exe owlen-code.exe
-          cd ..
-          mv dist/${ARTIFACT}.zip .
-          sha256sum ${ARTIFACT}.zip > ${ARTIFACT}.zip.sha256
-        else
-          cp target/${TARGET}/release/owlen dist/owlen
-          cp target/${TARGET}/release/owlen-code dist/owlen-code
-          cd dist
-          tar czf ${ARTIFACT}.tar.gz owlen owlen-code
-          cd ..
-          mv dist/${ARTIFACT}.tar.gz .
-          sha256sum ${ARTIFACT}.tar.gz > ${ARTIFACT}.tar.gz.sha256
-        fi
-
-  - name: release
-    image: plugins/gitea-release
-    settings:
-      api_key:
-        from_secret: gitea_token
-      base_url: https://somegit.dev
-      files:
-        - ${ARTIFACT}.tar.gz
-        - ${ARTIFACT}.tar.gz.sha256
-        - ${ARTIFACT}.zip
-        - ${ARTIFACT}.zip.sha256
-      title: Release ${CI_COMMIT_TAG}
-      note: "Release ${CI_COMMIT_TAG}"

Cargo.toml

@@ -1,64 +1,34 @@
 [workspace]
-resolver = "2"
 members = [
-    "crates/owlen-core",
-    "crates/owlen-tui",
-    "crates/owlen-cli",
-    "crates/owlen-ollama",
+    "crates/app/cli",
+    "crates/app/ui",
+    "crates/core/agent",
+    "crates/llm/core",
+    "crates/llm/anthropic",
+    "crates/llm/ollama",
+    "crates/llm/openai",
+    "crates/platform/auth",
+    "crates/platform/config",
+    "crates/platform/credentials",
+    "crates/platform/hooks",
+    "crates/platform/permissions",
+    "crates/platform/plugins",
+    "crates/tools/ask",
+    "crates/tools/bash",
+    "crates/tools/fs",
+    "crates/tools/notebook",
+    "crates/tools/plan",
+    "crates/tools/skill",
+    "crates/tools/slash",
+    "crates/tools/task",
+    "crates/tools/todo",
+    "crates/tools/web",
+    "crates/integration/mcp-client",
+    "crates/integration/jsonrpc",
 ]
-exclude = []
+resolver = "2"
 
 [workspace.package]
-version = "0.1.5"
-edition = "2021"
-authors = ["Owlibou"]
+edition = "2024"
 license = "AGPL-3.0"
-repository = "https://somegit.dev/Owlibou/owlen"
-homepage = "https://somegit.dev/Owlibou/owlen"
-keywords = ["llm", "tui", "cli", "ollama", "chat"]
-categories = ["command-line-utilities"]
-
-[workspace.dependencies]
-# Async runtime and utilities
-tokio = { version = "1.0", features = ["full"] }
-tokio-stream = "0.1"
-tokio-util = { version = "0.7", features = ["rt"] }
-futures = "0.3"
-futures-util = "0.3"
-
-# TUI framework
-ratatui = "0.28"
-crossterm = "0.28"
-tui-textarea = "0.6"
-
-# HTTP client and JSON handling
-reqwest = { version = "0.12", default-features = false, features = ["json", "stream", "rustls-tls"] }
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-
-# Utilities
-uuid = { version = "1.0", features = ["v4", "serde"] }
-anyhow = "1.0"
-thiserror = "1.0"
-
-# Configuration
-toml = "0.8"
-shellexpand = "3.1"
-
-# Database
-sled = "0.34"
-
-# For better text handling
-textwrap = "0.16"
-
-# Async traits
-async-trait = "0.1"
-
-# CLI framework
-clap = { version = "4.0", features = ["derive"] }
-
-# Dev dependencies
-tempfile = "3.8"
-tokio-test = "0.4"
-
-# For more keys and their definitions, see https://doc.rust-lang.org/cargo/reference/manifest.html
+rust-version = "1.91"

LICENSE

@@ -1,662 +0,0 @@
-                    GNU AFFERO GENERAL PUBLIC LICENSE
-                       Version 3, 19 November 2007
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- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
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-

PERMISSION_SYSTEM.md

@@ -0,0 +1,311 @@
+# Permission System - TUI Implementation
+
+## Overview
+
+The TUI now has a fully functional interactive permission system that allows users to grant, deny, or permanently allow tool executions through an elegant popup interface.
+
+## Features Implemented
+
+### 1. Interactive Permission Popup
+
+**Location:** `crates/app/ui/src/components/permission_popup.rs`
+
+- **Visual Design:**
+  - Centered modal popup with themed border
+  - Tool name highlighted with icon (⚡)
+  - Context information (file path, command, etc.)
+  - Four selectable options with icons
+  - Keyboard shortcuts and navigation hints
+
+- **Options Available:**
+  - ✓ `[a]` **Allow once** - Execute this one time
+  - ✓✓ `[A]` **Always allow** - Add permanent rule to permission manager
+  - ✗ `[d]` **Deny** - Refuse this operation
+  - ? `[?]` **Explain** - Show what this operation does
+
+- **Navigation:**
+  - Arrow keys (↑/↓) to select options
+  - Enter to confirm selection
+  - Keyboard shortcuts (a/A/d/?) for quick selection
+  - Esc to deny and close
+
+### 2. Permission Flow Integration
+
+**Location:** `crates/app/ui/src/app.rs`
+
+#### New Components:
+
+1. **PendingToolCall struct:**
+   ```rust
+   struct PendingToolCall {
+       tool_name: String,
+       arguments: Value,
+       perm_tool: PermTool,
+       context: Option<String>,
+   }
+   ```
+   Stores information about tool awaiting permission.
+
+2. **TuiApp fields:**
+   - `pending_tool: Option<PendingToolCall>` - Current pending tool
+   - `permission_tx: Option<oneshot::Sender<bool>>` - Channel to signal decision
+
+3. **execute_tool_with_permission() method:**
+   ```rust
+   async fn execute_tool_with_permission(
+       &mut self,
+       tool_name: &str,
+       arguments: &Value,
+   ) -> Result<String>
+   ```
+
+   **Flow:**
+   1. Maps tool name to PermTool enum (Read, Write, Edit, Bash, etc.)
+   2. Extracts context (file path, command, etc.)
+   3. Checks permission via PermissionManager
+   4. If `Allow` → Execute immediately
+   5. If `Deny` → Return error
+   6. If `Ask` → Show popup and wait for user decision
+
+   **Async Wait Mechanism:**
+   - Creates oneshot channel for permission response
+   - Shows permission popup
+   - Awaits channel response (with 5-minute timeout)
+   - Event loop continues processing keyboard events
+   - When user responds, channel signals and execution resumes
+
+### 3. Permission Decision Handling
+
+**Location:** `crates/app/ui/src/app.rs:184-254`
+
+When user makes a choice in the popup:
+
+- **Allow Once:**
+  - Signals permission granted (sends `true` through channel)
+  - Tool executes once
+  - No persistent changes
+
+- **Always Allow:**
+  - Adds new rule to PermissionManager
+  - Rule format: `perms.add_rule(tool, context, Action::Allow)`
+  - Example: Always allow reading from `src/` directory
+  - Signals permission granted
+  - All future matching operations auto-approved
+
+- **Deny:**
+  - Signals permission denied (sends `false`)
+  - Tool execution fails with error
+  - Error shown in chat
+
+- **Explain:**
+  - Shows explanation of what the tool does
+  - Popup remains open for user to choose again
+  - Tool-specific explanations:
+    - `read` → "read a file from disk"
+    - `write` → "write or overwrite a file"
+    - `edit` → "modify an existing file"
+    - `bash` → "execute a shell command"
+    - `grep` → "search for patterns in files"
+    - `glob` → "list files matching a pattern"
+
+### 4. Agent Loop Integration
+
+**Location:** `crates/app/ui/src/app.rs:488`
+
+Changed from:
+```rust
+match execute_tool(tool_name, arguments, &self.perms).await {
+```
+
+To:
+```rust
+match self.execute_tool_with_permission(tool_name, arguments).await {
+```
+
+This ensures all tool calls in the streaming agent loop go through the permission system.
+
+## Architecture Details
+
+### Async Concurrency Model
+
+The implementation uses Rust's async/await with tokio to handle the permission flow without blocking the UI:
+
+```
+┌─────────────────────────────────────────────────────────┐
+│                     Event Loop                          │
+│  (continuously running at 60 FPS)                       │
+│                                                          │
+│  while running {                                        │
+│    terminal.draw(...)  ← Always responsive              │
+│    if let Ok(event) = event_rx.try_recv() {            │
+│      handle_event(event).await                          │
+│    }                                                     │
+│    tokio::sleep(16ms).await  ← Yields to runtime       │
+│  }                                                       │
+└─────────────────────────────────────────────────────────┘
+                    ↕
+┌─────────────────────────────────────────────────────────┐
+│              Keyboard Event Listener                    │
+│  (separate tokio task)                                  │
+│                                                          │
+│  loop {                                                 │
+│    event = event_stream.next().await                    │
+│    event_tx.send(Input(key))                            │
+│  }                                                       │
+└─────────────────────────────────────────────────────────┘
+                    ↕
+┌─────────────────────────────────────────────────────────┐
+│          Permission Request Flow                        │
+│                                                          │
+│  1. Tool needs permission (PermissionDecision::Ask)     │
+│  2. Create oneshot channel (tx, rx)                     │
+│  3. Show popup, store tx                                │
+│  4. await rx  ← Yields to event loop                    │
+│  5. Event loop continues, handles keyboard              │
+│  6. User presses 'a' → handle_event processes           │
+│  7. tx.send(true) signals channel                       │
+│  8. rx.await completes, returns true                    │
+│  9. Tool executes with permission                       │
+└─────────────────────────────────────────────────────────┘
+```
+
+### Key Insight
+
+The implementation works because:
+1. **Awaiting is non-blocking:** When we `await rx`, we yield control to the tokio runtime
+2. **Event loop continues:** The outer event loop continues to run its iterations
+3. **Keyboard events processed:** The separate event listener task continues reading keyboard
+4. **Channel signals resume:** When user responds, the channel completes and we resume
+
+This creates a smooth UX where the UI remains responsive while waiting for permission.
+
+## Usage Examples
+
+### Example 1: First-time File Write
+
+```
+User: "Create a new file hello.txt with 'Hello World'"
+
+Agent: [Calls write tool]
+
+┌───────────────────────────────────────┐
+│ 🔒 Permission Required                │
+├───────────────────────────────────────┤
+│ ⚡ Tool: write                         │
+│ 📝 Context:                           │
+│    hello.txt                          │
+├───────────────────────────────────────┤
+│ ▶ ✓ [a] Allow once                    │
+│   ✓✓ [A] Always allow                 │
+│   ✗ [d] Deny                          │
+│   ? [?] Explain                       │
+│                                       │
+│ ↑↓ Navigate  Enter to select  Esc... │
+└───────────────────────────────────────┘
+
+User presses 'a' → File created once
+```
+
+### Example 2: Always Allow Bash in Current Directory
+
+```
+User: "Run npm test"
+
+Agent: [Calls bash tool]
+
+[Permission popup shows with context: "npm test"]
+
+User presses 'A' → Rule added: bash("npm test*") → Allow
+
+Future: User: "Run npm test:unit"
+        Agent: [Executes immediately, no popup]
+```
+
+### Example 3: Explanation Request
+
+```
+User: "Read my secrets.env file"
+
+[Permission popup appears]
+
+User presses '?' →
+
+System: "Tool 'read' requires permission. This operation
+        will read a file from disk."
+
+[Popup remains open]
+
+User presses 'd' → Permission denied
+```
+
+## Testing
+
+Build status: ✅ All tests pass
+```bash
+cargo build --workspace  # Success
+cargo test --workspace --lib  # 28 tests passed
+```
+
+## Configuration
+
+The permission system respects three modes from `PermissionManager`:
+
+1. **Plan Mode** (default):
+   - Read operations (read, grep, glob) → Auto-allowed
+   - Write operations (write, edit) → Ask
+   - System operations (bash) → Ask
+
+2. **AcceptEdits Mode**:
+   - Read operations → Auto-allowed
+   - Write operations → Auto-allowed
+   - System operations (bash) → Ask
+
+3. **Code Mode**:
+   - All operations → Auto-allowed
+   - No popups shown
+
+User can override mode with CLI flag: `--mode code`
+
+## Future Enhancements
+
+Potential improvements:
+
+1. **Permission History:**
+   - Show recently granted/denied permissions
+   - `/permissions` command to view active rules
+
+2. **Temporary Rules:**
+   - "Allow for this session" option
+   - Rules expire when TUI closes
+
+3. **Pattern-based Rules:**
+   - "Always allow reading from `src/` directory"
+   - "Always allow bash commands starting with `npm`"
+
+4. **Visual Feedback:**
+   - Show indicator when permission auto-granted by rule
+   - Different styling for policy-denied vs user-denied
+
+5. **Rule Management:**
+   - `/clear-rules` command
+   - Edit/remove specific rules interactively
+
+## Files Modified
+
+- `crates/app/ui/src/app.rs` - Main permission flow logic
+- `crates/app/ui/src/events.rs` - Removed unused event type
+- `crates/app/ui/src/components/permission_popup.rs` - Pre-existing, now fully integrated
+
+## Summary
+
+The TUI permission system is now fully functional, providing:
+- ✅ Interactive permission popups with keyboard navigation
+- ✅ Four permission options (allow once, always, deny, explain)
+- ✅ Runtime permission rule updates
+- ✅ Async flow that keeps UI responsive
+- ✅ Integration with existing permission manager
+- ✅ Tool-specific context and explanations
+- ✅ Timeout handling (5 minutes)
+- ✅ All tests passing
+
+Users can now safely interact with the AI agent while maintaining control over potentially dangerous operations.

PKGBUILD

@@ -1,44 +0,0 @@
-# Maintainer: vikingowl <christian@nachtigall.dev>
-pkgname=owlen
-pkgver=0.1.4
-pkgrel=1
-pkgdesc="Terminal User Interface LLM client for Ollama with chat and code assistance features"
-arch=('x86_64')
-url="https://somegit.dev/Owlibou/owlen"
-license=('AGPL-3.0-or-later')
-depends=('gcc-libs')
-makedepends=('cargo' 'git')
-options=(!lto)  # avoid LTO-linked ring symbol drop with lld
-source=("$pkgname-$pkgver.tar.gz::$url/archive/v$pkgver.tar.gz")
-sha256sums=('cabb1cfdfc247b5d008c6c5f94e13548bcefeba874aae9a9d45aa95ae1c085ec')
-
-prepare() {
-    cd $pkgname
-    cargo fetch --target "$(rustc -vV | sed -n 's/host: //p')"
-}
-
-build() {
-    cd $pkgname
-    export RUSTFLAGS="${RUSTFLAGS:-} -C link-arg=-Wl,--no-as-needed"
-    export CARGO_PROFILE_RELEASE_LTO=false
-    export CARGO_TARGET_DIR=target
-    cargo build --frozen --release --all-features
-}
-
-check() {
-    cd $pkgname
-    export RUSTFLAGS="${RUSTFLAGS:-} -C link-arg=-Wl,--no-as-needed"
-    cargo test --frozen --all-features
-}
-
-package() {
-    cd $pkgname
-
-    # Install binaries
-    install -Dm755 target/release/owlen "$pkgdir/usr/bin/owlen"
-    install -Dm755 target/release/owlen-code "$pkgdir/usr/bin/owlen-code"
-
-    # Install documentation
-    install -Dm644 README.md "$pkgdir/usr/share/doc/$pkgname/README.md"
-}
-

PLUGIN_HOOKS_INTEGRATION.md

@@ -0,0 +1,363 @@
+# Plugin Hooks Integration
+
+This document describes how the plugin system integrates with the hook system to allow plugins to define lifecycle hooks.
+
+## Overview
+
+Plugins can now define hooks in a `hooks/hooks.json` file that will be automatically registered with the `HookManager` during application startup. This allows plugins to:
+
+- Intercept and validate tool calls before execution (PreToolUse)
+- React to tool execution results (PostToolUse)
+- Run code at session boundaries (SessionStart, SessionEnd)
+- Process user input (UserPromptSubmit)
+- Handle context compaction (PreCompact)
+
+## Plugin Hook Configuration
+
+Plugins define hooks in `hooks/hooks.json`:
+
+```json
+{
+  "description": "Validation and logging hooks for the plugin",
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 ${CLAUDE_PLUGIN_ROOT}/hooks/validate.py",
+            "timeout": 5000
+          }
+        ]
+      },
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/bash_guard.sh"
+          }
+        ]
+      }
+    ],
+    "PostToolUse": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "echo 'Tool executed' >> ${CLAUDE_PLUGIN_ROOT}/logs/tool.log && exit 0"
+          }
+        ]
+      }
+    ]
+  }
+}
+```
+
+### Hook Configuration Schema
+
+- **description** (optional): A human-readable description of what the hooks do
+- **hooks**: A map of event names to hook matchers
+  - **PreToolUse**: Hooks that run before a tool is executed
+  - **PostToolUse**: Hooks that run after a tool is executed
+  - **SessionStart**: Hooks that run when a session starts
+  - **SessionEnd**: Hooks that run when a session ends
+  - **UserPromptSubmit**: Hooks that run when the user submits a prompt
+  - **PreCompact**: Hooks that run before context compaction
+
+### Hook Matcher
+
+Each hook matcher contains:
+
+- **matcher** (optional): A regex pattern to match against tool names (for PreToolUse events)
+  - Example: `"Edit|Write"` matches both Edit and Write tools
+  - Example: `".*"` matches all tools
+  - If not specified, the hook applies to all tools
+- **hooks**: An array of hook definitions
+
+### Hook Definition
+
+Each hook definition contains:
+
+- **type**: The hook type (`"command"` or `"prompt"`)
+- **command**: The shell command to execute (for command-type hooks)
+  - Can use `${CLAUDE_PLUGIN_ROOT}` which is replaced with the plugin's base path
+- **prompt** (future): An LLM prompt for AI-based validation
+- **timeout** (optional): Timeout in milliseconds (default: no timeout)
+
+## Variable Substitution
+
+The following variables are automatically substituted in hook commands:
+
+- **${CLAUDE_PLUGIN_ROOT}**: The absolute path to the plugin directory
+  - Example: `~/.config/owlen/plugins/my-plugin`
+  - Useful for referencing scripts within the plugin
+
+## Hook Execution Behavior
+
+### Exit Codes
+
+Hooks communicate their decision via exit codes:
+
+- **0**: Allow the operation to proceed
+- **2**: Deny the operation (blocks the tool call)
+- **Other**: Error (operation fails with error message)
+
+### Input/Output
+
+Hooks receive JSON input via stdin containing the event data:
+
+```json
+{
+  "event": "preToolUse",
+  "tool": "Edit",
+  "args": {
+    "path": "/path/to/file.txt",
+    "old_string": "foo",
+    "new_string": "bar"
+  }
+}
+```
+
+### Pattern Matching
+
+For PreToolUse hooks, the `matcher` field is treated as a regex pattern:
+
+- `"Edit|Write"` - Matches Edit OR Write tools
+- `"Bash"` - Matches only Bash tool
+- `".*"` - Matches all tools
+- No matcher - Applies to all tools
+
+### Multiple Hooks
+
+- Multiple plugins can define hooks for the same event
+- All matching hooks are executed in sequence
+- If any hook denies (exit code 2), the operation is blocked
+- File-based hooks in `.owlen/hooks/` are executed first, then plugin hooks
+
+## Integration Architecture
+
+### Loading Process
+
+1. **Application Startup** (`main.rs`):
+   ```rust
+   // Create hook manager
+   let mut hook_mgr = HookManager::new(".");
+
+   // Register plugin hooks
+   for plugin in app_context.plugin_manager.plugins() {
+       if let Ok(Some(hooks_config)) = plugin.load_hooks_config() {
+           for (event, command, pattern, timeout) in plugin.register_hooks_with_manager(&hooks_config) {
+               hook_mgr.register_hook(event, command, pattern, timeout);
+           }
+       }
+   }
+   ```
+
+2. **Plugin Hook Loading** (`plugins/src/lib.rs`):
+   - `Plugin::load_hooks_config()` reads and parses `hooks/hooks.json`
+   - `Plugin::register_hooks_with_manager()` processes the config and performs variable substitution
+
+3. **Hook Registration** (`hooks/src/lib.rs`):
+   - `HookManager::register_hook()` stores hooks internally
+   - `HookManager::execute()` filters and executes matching hooks
+
+### Execution Flow
+
+```
+Tool Call Request
+    ↓
+Permission Check
+    ↓
+HookManager::execute(PreToolUse)
+    ↓
+Check file-based hook (.owlen/hooks/PreToolUse)
+    ↓
+Filter plugin hooks by event and pattern
+    ↓
+Execute each matching hook
+    ↓
+If any hook denies → Block operation
+    ↓
+If all allow → Execute tool
+    ↓
+HookManager::execute(PostToolUse)
+```
+
+## Example: Validation Hook
+
+Create a plugin with a validation hook:
+
+**Directory structure:**
+```
+~/.config/owlen/plugins/validation/
+├── plugin.json
+└── hooks/
+    ├── hooks.json
+    └── validate.py
+```
+
+**plugin.json:**
+```json
+{
+  "name": "validation",
+  "version": "1.0.0",
+  "description": "Validation hooks for file operations"
+}
+```
+
+**hooks/hooks.json:**
+```json
+{
+  "description": "Validate file operations",
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 ${CLAUDE_PLUGIN_ROOT}/hooks/validate.py",
+            "timeout": 5000
+          }
+        ]
+      }
+    ]
+  }
+}
+```
+
+**hooks/validate.py:**
+```python
+#!/usr/bin/env python3
+import json
+import sys
+
+# Read event from stdin
+event = json.load(sys.stdin)
+
+tool = event.get('tool')
+args = event.get('args', {})
+path = args.get('path', '')
+
+# Deny operations on system files
+if path.startswith('/etc/') or path.startswith('/sys/'):
+    print(f"Blocked: Cannot modify system file {path}", file=sys.stderr)
+    sys.exit(2)  # Deny
+
+# Allow all other operations
+sys.exit(0)  # Allow
+```
+
+**Make executable:**
+```bash
+chmod +x ~/.config/owlen/plugins/validation/hooks/validate.py
+```
+
+## Testing
+
+### Unit Tests
+
+Test hook registration and execution:
+
+```rust
+#[tokio::test]
+async fn test_plugin_hooks() -> Result<()> {
+    let mut hook_mgr = HookManager::new(".");
+
+    hook_mgr.register_hook(
+        "PreToolUse".to_string(),
+        "echo 'validated' && exit 0".to_string(),
+        Some("Edit|Write".to_string()),
+        Some(5000),
+    );
+
+    let event = HookEvent::PreToolUse {
+        tool: "Edit".to_string(),
+        args: serde_json::json!({}),
+    };
+
+    let result = hook_mgr.execute(&event, Some(5000)).await?;
+    assert_eq!(result, HookResult::Allow);
+
+    Ok(())
+}
+```
+
+### Integration Tests
+
+Test the full plugin loading and hook execution:
+
+```rust
+#[tokio::test]
+async fn test_plugin_hooks_integration() -> Result<()> {
+    // Create plugin with hooks
+    let plugin_dir = create_test_plugin_with_hooks()?;
+
+    // Load plugin
+    let mut plugin_manager = PluginManager::with_dirs(vec![plugin_dir]);
+    plugin_manager.load_all()?;
+
+    // Register hooks
+    let mut hook_mgr = HookManager::new(".");
+    for plugin in plugin_manager.plugins() {
+        if let Ok(Some(config)) = plugin.load_hooks_config() {
+            for (event, cmd, pattern, timeout) in plugin.register_hooks_with_manager(&config) {
+                hook_mgr.register_hook(event, cmd, pattern, timeout);
+            }
+        }
+    }
+
+    // Test hook execution
+    let event = HookEvent::PreToolUse {
+        tool: "Edit".to_string(),
+        args: serde_json::json!({}),
+    };
+
+    let result = hook_mgr.execute(&event, Some(5000)).await?;
+    assert_eq!(result, HookResult::Allow);
+
+    Ok(())
+}
+```
+
+## Implementation Details
+
+### Modified Crates
+
+1. **plugins** (`crates/platform/plugins/src/lib.rs`):
+   - Added `PluginHooksConfig`, `HookMatcher`, `HookDefinition` structs
+   - Added `Plugin::load_hooks_config()` method
+   - Added `Plugin::register_hooks_with_manager()` method
+
+2. **hooks** (`crates/platform/hooks/src/lib.rs`):
+   - Refactored to store registered hooks internally
+   - Added `HookManager::register_hook()` method
+   - Updated `HookManager::execute()` to handle both file-based and registered hooks
+   - Added pattern matching support using regex
+   - Added `regex` dependency
+
+3. **owlen** (`crates/app/cli/src/main.rs`):
+   - Integrated plugin hook loading during startup
+   - Registered plugin hooks with HookManager
+
+### Dependencies Added
+
+- **hooks/Cargo.toml**: Added `regex = "1.10"`
+
+## Benefits
+
+1. **Modularity**: Hooks can be packaged with plugins and distributed independently
+2. **Reusability**: Plugins can be shared across projects
+3. **Flexibility**: Each plugin can define multiple hooks with different patterns
+4. **Compatibility**: Works alongside existing file-based hooks in `.owlen/hooks/`
+5. **Variable Substitution**: `${CLAUDE_PLUGIN_ROOT}` makes scripts portable
+
+## Future Enhancements
+
+1. **Prompt-based hooks**: Use LLM for validation instead of shell commands
+2. **Hook priorities**: Control execution order of hooks
+3. **Hook metadata**: Description, author, version for each hook
+4. **Hook debugging**: Better error messages and logging
+5. **Async hooks**: Support for long-running hooks that don't block

README.md

@@ -1,307 +0,0 @@
-# OWLEN
-
-> Terminal-native assistant for running local language models with a comfortable TUI.
-
-![Status](https://img.shields.io/badge/status-alpha-yellow)
-![Version](https://img.shields.io/badge/version-0.1.0-blue)
-![Rust](https://img.shields.io/badge/made_with-Rust-ffc832?logo=rust&logoColor=white)
-![License](https://img.shields.io/badge/license-AGPL--3.0-blue)
-
-## Alpha Status
-
-- This project is currently in **alpha** (v0.1.5) and under active development.
-- Core features are functional but expect occasional bugs and missing polish.
-- Breaking changes may occur between releases as we refine the API.
-- Feedback, bug reports, and contributions are very welcome!
-
-## What Is OWLEN?
-
-OWLEN is a Rust-powered, terminal-first interface for interacting with local large
-language models. It provides a responsive chat workflow that runs against
-[Ollama](https://ollama.com/) with a focus on developer productivity, vim-style navigation,
-and seamless session management—all without leaving your terminal.
-
-## Screenshots
-
-### Initial Layout
-![OWLEN TUI Layout](images/layout.png)
-
-The OWLEN interface features a clean, multi-panel layout with vim-inspired navigation. See more screenshots in the [`images/`](images/) directory including:
-- Full chat conversations (`chat_view.png`)
-- Help menu (`help.png`)
-- Model selection (`model_select.png`)
-- Visual selection mode (`select_mode.png`)
-
-## Features
-
-### Chat Client (`owlen`)
-- **Vim-style Navigation** - Normal, editing, visual, and command modes
-- **Streaming Responses** - Real-time token streaming from Ollama
-- **Multi-Panel Interface** - Separate panels for chat, thinking content, and input
-- **Advanced Text Editing** - Multi-line input with `tui-textarea`, history navigation
-- **Visual Selection & Clipboard** - Yank/paste text across panels
-- **Flexible Scrolling** - Half-page, full-page, and cursor-based navigation
-- **Model Management** - Interactive model and provider selection (press `m`)
-- **Session Persistence** - Save and load conversations to/from disk
-- **AI-Generated Descriptions** - Automatic short summaries for saved sessions
-- **Session Management** - Start new conversations, clear history, browse saved sessions
-- **Thinking Mode Support** - Dedicated panel for extended reasoning content
-- **Bracketed Paste** - Safe paste handling for multi-line content
-
-### Code Client (`owlen-code`) [Experimental]
-- All chat client features
-- Optimized system prompt for programming assistance
-- Foundation for future code-specific features
-
-### Core Infrastructure
-- **Modular Architecture** - Separated core logic, TUI components, and providers
-- **Provider System** - Extensible provider trait (currently: Ollama)
-- **Session Controller** - Unified conversation and state management
-- **Configuration Management** - TOML-based config with sensible defaults
-- **Message Formatting** - Markdown rendering, thinking content extraction
-- **Async Runtime** - Built on Tokio for efficient streaming
-
-## Getting Started
-
-### Prerequisites
-- Rust 1.75+ and Cargo (`rustup` recommended)
-- A running Ollama instance with at least one model pulled
-  (defaults to `http://localhost:11434`)
-- A terminal that supports 256 colors
-
-### Clone and Build
-
-```bash
-git clone https://somegit.dev/Owlibou/owlen.git
-cd owlen
-cargo build --release
-```
-
-### Run the Chat Client
-
-Make sure Ollama is running, then launch:
-
-```bash
-./target/release/owlen
-# or during development:
-cargo run --bin owlen
-```
-
-### (Optional) Try the Code Client
-
-The coding-focused TUI is experimental:
-
-```bash
-cargo build --release --bin owlen-code --features code-client
-./target/release/owlen-code
-```
-
-## Using the TUI
-
-### Mode System (Vim-inspired)
-
-**Normal Mode** (default):
-- `i` / `Enter` - Enter editing mode
-- `a` - Append (move right and enter editing mode)
-- `A` - Append at end of line
-- `I` - Insert at start of line
-- `o` - Insert new line below
-- `O` - Insert new line above
-- `v` - Enter visual mode (text selection)
-- `:` - Enter command mode
-- `h/j/k/l` - Navigate left/down/up/right
-- `w/b/e` - Word navigation
-- `0/$` - Jump to line start/end
-- `gg` - Jump to top
-- `G` - Jump to bottom
-- `Ctrl-d/u` - Half-page scroll
-- `Ctrl-f/b` - Full-page scroll
-- `Tab` - Cycle focus between panels
-- `p` - Paste from clipboard
-- `dd` - Clear input buffer
-- `q` - Quit
-
-**Editing Mode**:
-- `Esc` - Return to normal mode
-- `Enter` - Send message and return to normal mode
-- `Ctrl-J` / `Shift-Enter` - Insert newline
-- `Ctrl-↑/↓` - Navigate input history
-- Paste events handled automatically
-
-**Visual Mode**:
-- `j/k/h/l` - Extend selection
-- `w/b/e` - Word-based selection
-- `y` - Yank (copy) selection
-- `d` - Cut selection (Input panel only)
-- `Esc` - Cancel selection
-
-**Command Mode**:
-- `:q` / `:quit` - Quit application
-- `:c` / `:clear` - Clear conversation
-- `:m` / `:model` - Open model selector
-- `:n` / `:new` - Start new conversation
-- `:h` / `:help` - Show help
-- `:save [name]` / `:w [name]` - Save current conversation
-- `:load` / `:open` - Browse and load saved sessions
-- `:sessions` / `:ls` - List saved sessions
-
-**Session Browser** (accessed via `:load` or `:sessions`):
-- `j` / `k` / `↑` / `↓` - Navigate sessions
-- `Enter` - Load selected session
-- `d` - Delete selected session
-- `Esc` - Close browser
-
-### Panel Management
-- Three panels: Chat, Thinking, and Input
-- `Tab` / `Shift-Tab` - Cycle focus forward/backward
-- Focused panel receives scroll and navigation commands
-- Thinking panel appears when extended reasoning is available
-
-## Configuration
-
-OWLEN stores configuration in `~/.config/owlen/config.toml`. The file is created
-on first run and can be edited to customize behavior:
-
-```toml
-[general]
-default_model = "llama3.2:latest"
-default_provider = "ollama"
-enable_streaming = true
-project_context_file = "OWLEN.md"
-
-[providers.ollama]
-provider_type = "ollama"
-base_url = "http://localhost:11434"
-timeout = 300
-```
-
-### Storage Settings
-
-Sessions are saved to platform-specific directories by default:
-- **Linux**: `~/.local/share/owlen/sessions`
-- **Windows**: `%APPDATA%\owlen\sessions`
-- **macOS**: `~/Library/Application Support/owlen/sessions`
-
-You can customize this in your config:
-
-```toml
-[storage]
-# conversation_dir = "~/custom/path"  # Optional: override default location
-max_saved_sessions = 25
-generate_descriptions = true  # AI-generated summaries for saved sessions
-```
-
-Configuration is automatically saved when you change models or providers.
-
-## Repository Layout
-
-```
-owlen/
-├── crates/
-│   ├── owlen-core/       # Core types, session management, shared UI components
-│   ├── owlen-ollama/     # Ollama provider implementation
-│   ├── owlen-tui/        # TUI components (chat_app, code_app, rendering)
-│   └── owlen-cli/        # Binary entry points (owlen, owlen-code)
-├── LICENSE               # AGPL-3.0 License
-├── Cargo.toml            # Workspace configuration
-└── README.md
-```
-
-### Architecture Highlights
-- **owlen-core**: Provider-agnostic core with session controller, UI primitives (AutoScroll, InputMode, FocusedPanel), and shared utilities
-- **owlen-tui**: Ratatui-based UI implementation with vim-style modal editing
-- **Separation of Concerns**: Clean boundaries between business logic, presentation, and provider implementations
-
-## Development
-
-### Building
-```bash
-# Debug build
-cargo build
-
-# Release build
-cargo build --release
-
-# Build with all features
-cargo build --all-features
-
-# Run tests
-cargo test
-
-# Check code
-cargo clippy
-cargo fmt
-```
-
-### Development Notes
-- Standard Rust workflows apply (`cargo fmt`, `cargo clippy`, `cargo test`)
-- Codebase uses async Rust (`tokio`) for event handling and streaming
-- Configuration is cached in `~/.config/owlen` (wipe to reset)
-- UI components are extensively tested in `owlen-core/src/ui.rs`
-
-## Roadmap
-
-### Completed ✓
-- [x] Streaming responses with real-time display
-- [x] Autoscroll and viewport management
-- [x] Push user message before loading LLM response
-- [x] Thinking mode support with dedicated panel
-- [x] Vim-style modal editing (Normal, Visual, Command modes)
-- [x] Multi-panel focus management
-- [x] Text selection and clipboard functionality
-- [x] Comprehensive keyboard navigation
-- [x] Bracketed paste support
-
-### In Progress
-- [x] Session persistence (save/load conversations)
-- [ ] Theming options and color customization
-- [ ] Enhanced configuration UX (in-app settings)
-- [ ] Conversation export (Markdown, JSON, plain text)
-
-### Planned
-- [ ] Code Client Enhancement
-  - [ ] In-project code navigation
-  - [ ] Syntax highlighting for code blocks
-  - [ ] File tree browser integration
-  - [ ] Project-aware context management
-  - [ ] Code snippets and templates
-- [ ] Additional LLM Providers
-  - [ ] OpenAI API support
-  - [ ] Anthropic Claude support
-  - [ ] Local model providers (llama.cpp, etc.)
-- [ ] Advanced Features
-  - [ ] Conversation search and filtering
-  - [ ] Multi-session management
-  - [ ] Export conversations (Markdown, JSON)
-  - [ ] Custom keybindings
-  - [ ] Plugin system
-
-## Contributing
-
-Contributions are welcome! Here's how to get started:
-
-1. Fork the repository
-2. Create a feature branch (`git checkout -b feature/amazing-feature`)
-3. Make your changes and add tests
-4. Run `cargo fmt` and `cargo clippy`
-5. Commit your changes (`git commit -m 'Add amazing feature'`)
-6. Push to the branch (`git push origin feature/amazing-feature`)
-7. Open a Pull Request
-
-Please open an issue first for significant changes to discuss the approach.
-
-## License
-
-This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0) - see the [LICENSE](LICENSE) file for details.
-
-## Acknowledgments
-
-Built with:
-- [ratatui](https://ratatui.rs/) - Terminal UI framework
-- [crossterm](https://github.com/crossterm-rs/crossterm) - Cross-platform terminal manipulation
-- [tokio](https://tokio.rs/) - Async runtime
-- [Ollama](https://ollama.com/) - Local LLM runtime
-
----
-
-**Status**: Alpha v0.1.0 | **License**: AGPL-3.0 | **Made with Rust** 🦀

TODO.md

@@ -0,0 +1,262 @@
+# Owlen Project Improvement Roadmap
+
+Generated from codebase analysis on 2025-11-01
+
+## Overall Assessment
+
+**Grade:** A (90/100)
+**Status:** Production-ready with minor enhancements needed
+**Architecture:** Excellent domain-driven design with clean separation of concerns
+
+---
+
+## 🔴 Critical Issues (Do First)
+
+- [x] **Fix Integration Test Failure** (`crates/app/cli/tests/chat_stream.rs`) ✅ **COMPLETED**
+  - Fixed mock server to accept requests with tools parameter
+  - Test now passes successfully
+  - Location: `crates/app/cli/tests/chat_stream.rs`
+
+- [x] **Remove Side Effects from Library Code** (`crates/core/agent/src/lib.rs:348-349`) ✅ **COMPLETED**
+  - Replaced `println!` with `tracing` crate
+  - Added `tracing = "0.1"` dependency to `agent-core`
+  - Changed to structured logging: `tracing::debug!` for tool calls, `tracing::warn!` for errors
+  - Users can now control verbosity and route logs appropriately
+  - Location: `crates/core/agent/src/lib.rs:348, 352, 361`
+
+---
+
+## 🟡 High-Priority Improvements
+
+### Permission System ✅
+
+- [x] **Implement Proper Permission Selection in TUI** ✅ **COMPLETED**
+  - Added interactive permission popup with keyboard navigation
+  - Implemented "Allow once", "Always allow", "Deny", and "Explain" options
+  - Integrated permission requests into agent loop with async channels
+  - Added runtime permission rule updates for "Always allow"
+  - Permission popups pause execution and wait for user input
+  - Location: `crates/app/ui/src/app.rs`, `crates/app/ui/src/components/permission_popup.rs`
+
+### Documentation
+
+- [ ] **Add User-Facing README.md**
+  - Quick start guide
+  - Installation instructions
+  - Usage examples
+  - Feature overview
+  - Links to detailed docs
+  - Priority: HIGH
+
+- [ ] **Add Architecture Documentation**
+  - Crate dependency graph diagram
+  - Agent loop flow diagram
+  - Permission system flow diagram
+  - Plugin/hook integration points diagram
+  - Priority: MEDIUM
+
+### Feature Integration
+
+- [ ] **Integrate Plugin System**
+  - Wire plugin loading into `crates/app/cli/src/main.rs`
+  - Load plugins at startup
+  - Test with example plugins
+  - Priority: HIGH
+
+- [ ] **Integrate MCP Client into Agent**
+  - Add MCP tools to agent's tool registry
+  - Enable external tool servers (databases, APIs, etc.)
+  - Document MCP server setup
+  - Priority: HIGH
+
+- [ ] **Implement Real Web Search Provider**
+  - Add provider for DuckDuckGo, Brave Search, or SearXNG
+  - Make the web tool functional
+  - Add configuration for provider selection
+  - Priority: MEDIUM
+
+### Error Handling & Reliability
+
+- [ ] **Add Retry Logic for Transient Failures**
+  - Exponential backoff for Ollama API calls
+  - Configurable retry policies (max attempts, timeout)
+  - Handle network failures gracefully
+  - Priority: MEDIUM
+
+- [ ] **Enhance Error Messages**
+  - Add actionable suggestions for common errors
+  - Example: "Ollama not running? Try: `ollama serve`"
+  - Example: "Model not found? Try: `ollama pull qwen3:8b`"
+  - Priority: MEDIUM
+
+---
+
+## 🟢 Medium-Priority Enhancements
+
+### Testing
+
+- [ ] **Add UI Component Testing**
+  - Snapshot tests for TUI components
+  - Integration tests for user interactions
+  - Use `ratatui` testing utilities
+  - Priority: MEDIUM
+
+- [ ] **Add More Edge Case Tests**
+  - Glob patterns with special characters
+  - Edit operations with Unicode
+  - Very large file handling
+  - Concurrent tool execution
+  - Priority: MEDIUM
+
+- [ ] **Code Coverage Reporting**
+  - Integrate `tarpaulin` or `cargo-llvm-cov`
+  - Set minimum coverage thresholds (aim for 80%+)
+  - Track coverage trends over time
+  - Priority: LOW
+
+### Documentation
+
+- [ ] **Module-Level Documentation**
+  - Add `//!` docs to key modules
+  - Explain design decisions and patterns
+  - Document internal APIs
+  - Priority: MEDIUM
+
+- [ ] **Create Examples Directory**
+  - Simple CLI usage examples
+  - Custom plugin development guide
+  - Hook script examples
+  - MCP server integration examples
+  - Configuration templates
+  - Priority: MEDIUM
+
+### Code Quality
+
+- [ ] **Fix Dead Code Warning** (`ui/src/app.rs:38`)
+  - Either use `settings` field or remove it
+  - Remove `#[allow(dead_code)]`
+  - Priority: LOW
+
+- [ ] **Improve Error Recovery**
+  - Checkpoint auto-save on crashes
+  - Graceful degradation when tools fail
+  - Better handling of partial tool results
+  - Priority: MEDIUM
+
+---
+
+## 🔵 Low-Priority Nice-to-Haves
+
+### Project Infrastructure
+
+- [ ] **CI/CD Pipeline (GitHub Actions)**
+  - Automated testing on push
+  - Clippy linting
+  - Format checking with `rustfmt`
+  - Security audits with `cargo-audit`
+  - Cross-platform builds (Linux, macOS, Windows)
+  - Priority: LOW
+
+- [ ] **Performance Benchmarking**
+  - Add benchmark suite using `criterion` crate
+  - Track performance for glob, grep, large file ops
+  - Track agent loop iteration performance
+  - Priority: LOW
+
+### Code Organization
+
+- [ ] **Extract Reusable Crates**
+  - Publish `mcp-client` as standalone library
+  - Publish `llm-ollama` as standalone library
+  - Enable reuse by other projects
+  - Consider publishing to crates.io
+  - Priority: LOW
+
+---
+
+## 💡 Feature Enhancement Ideas
+
+### Session Management
+
+- [ ] **Session Persistence**
+  - Auto-save sessions across restarts
+  - Resume previous conversations
+  - Session history browser in TUI
+  - Export/import session transcripts
+
+### Multi-Provider Support
+
+- [ ] **Multi-Model Support**
+  - Support Anthropic Claude API
+  - Support OpenAI API
+  - Provider abstraction layer
+  - Fallback chains for reliability
+
+### Enhanced Permissions
+
+- [ ] **Advanced Permission System**
+  - Time-based permissions (expire after N minutes)
+  - Scope-based permissions (allow within specific directories)
+  - Permission profiles (dev, prod, strict)
+  - Team permission policies
+
+### Collaboration
+
+- [ ] **Collaborative Features**
+  - Export sessions as shareable transcripts
+  - Import/export checkpoints
+  - Shared permission policies for teams
+  - Session replay functionality
+
+### Observability
+
+- [ ] **Enhanced Observability**
+  - Token usage tracking per tool call
+  - Cost estimation dashboard
+  - Performance metrics export (JSON/CSV)
+  - OpenTelemetry integration
+  - Real-time stats in TUI
+
+---
+
+## 🚀 Quick Wins (Can Be Done Today)
+
+- [ ] Add `README.md` to repository root
+- [ ] Fix dead code warning in `ui/src/app.rs:38`
+- [ ] Add `tracing` crate and replace `println!` calls
+- [ ] Create `.github/workflows/ci.yml` for basic CI
+- [ ] Add module-level docs to `agent-core` and `config-agent`
+
+---
+
+## 🌟 Long-Term Vision
+
+- **Plugin Marketplace:** Curated registry of community plugins
+- **Interactive Tutorial:** Built-in tutorial mode for new users
+- **VS Code Extension:** Editor integration for inline assistance
+- **Collaborative Agents:** Multi-agent workflows with role assignment
+- **Knowledge Base Integration:** RAG capabilities for project-specific knowledge
+- **Web Dashboard:** Browser-based interface for session management
+- **Cloud Sync:** Sync configs and sessions across devices
+
+---
+
+## Notes
+
+- **Test Status:** 28+ tests, most passing. 1 integration test failure (mock server issue)
+- **Test Coverage:** Strong coverage for core functionality (permissions, checkpoints, hooks)
+- **Architecture:** Clean domain-driven workspace with 15 crates across 4 domains
+- **Code Quality:** Excellent error handling, consistent patterns, minimal technical debt
+- **Innovation Highlights:** Checkpoint/rewind system, three-tiered permissions, shell-based hooks
+
+---
+
+## Priority Legend
+
+- **HIGH:** Should be done soon, blocks other features or affects quality
+- **MEDIUM:** Important but not urgent, improves user experience
+- **LOW:** Nice to have, can be deferred
+
+---
+
+Last Updated: 2025-11-01

conductor/archive/stabilize_core_20251226/metadata.json

@@ -0,0 +1,8 @@
+{
+  "track_id": "stabilize_core_20251226",
+  "type": "feature",
+  "status": "new",
+  "created_at": "2025-12-26T10:00:00Z",
+  "updated_at": "2025-12-26T10:00:00Z",
+  "description": "Establish a comprehensive test suite for the core agent logic and ensure basic documentation for all crates."
+}

conductor/archive/stabilize_core_20251226/plan.md

@@ -0,0 +1,17 @@
+# Plan: Core Stabilization & Documentation
+
+## Phase 1: Core Agent & Platform Testing [checkpoint: 495f63f]
+
+- [x] Task: Write unit tests for `crates/core/agent/src/lib.rs` f5a5724
+- [x] Task: Write unit tests for `crates/platform/permissions/src/lib.rs` 94c89ce
+- [x] Task: Write unit tests for `crates/platform/config/src/lib.rs` b4a4a38
+- [x] Task: Conductor - User Manual Verification 'Core Agent & Platform Testing' (Protocol in workflow.md)
+
+## Phase 2: Documentation Audit & Standardization [checkpoint: 6486dd9]
+
+- [x] Task: Create/Update README.md for all crates in `crates/app/` f39c7a7
+- [x] Task: Create/Update README.md for all crates in `crates/llm/` f7aac07
+- [x] Task: Create/Update README.md for all crates in `crates/platform/` f9970074
+- [x] Task: Create/Update README.md for all crates in `crates/tools/` a764fd6b
+- [x] Task: Add doc-comments to all public functions in `crates/core/agent/` b555256d
+- [x] Task: Conductor - User Manual Verification 'Documentation Audit & Standardization' (Protocol in workflow.md)

conductor/archive/stabilize_core_20251226/spec.md

@@ -0,0 +1,14 @@
+# Specification: Core Stabilization & Documentation
+
+## Goal
+To increase the reliability and maintainability of the Owlen codebase by establishing a robust testing foundation and comprehensive documentation for all existing crates.
+
+## Scope
+- **Crates Covered:** All crates in the workspace (`app/*`, `core/*`, `llm/*`, `platform/*`, `tools/*`, `integration/*`).
+- **Testing:** Unit tests for core logic, focusing on the `core/agent` and `platform/*` crates.
+- **Documentation:** `README.md` for each crate and doc-comments for all public APIs.
+
+## Deliverables
+- Increased test coverage (targeting >80%) for core crates.
+- Comprehensive API documentation.
+- Standardized `README.md` files for all crates.

conductor/code_styleguides/markdown.md

@@ -0,0 +1,28 @@
+# Markdown Style Guide
+
+## General
+- **Line Wrapping:** Wrap lines at 80-100 characters for readability, unless it breaks a link or code block.
+- **Headers:**
+    - Use ATX-style headers (`#`, `##`, etc.).
+    - Leave one blank line before and after headers.
+- **Lists:**
+    - Use hyphens (`-`) for unordered lists.
+    - Use numbers (`1.`, `2.`) for ordered lists.
+    - Indent nested lists by 2 or 4 spaces.
+
+## Code Blocks
+- **Fenced Code Blocks:** Use triple backticks (```) for code blocks.
+- **Language Tags:** Always specify the language for syntax highlighting (e.g., ```rust).
+
+## Links & Images
+- **Reference Links:** Prefer inline links `[text](url)` for short links.
+- **Images:** Provide descriptive alt text for accessibility: `![Alt text](url)`.
+
+## Emphasis
+- **Bold:** Use double asterisks (`**text**`).
+- **Italic:** Use single asterisks (`*text*`) or underscores (`_text_`).
+- **Code:** Use single backticks (`` `text` ``) for inline code.
+
+## Structure
+- **Table of Contents:** Include a TOC for long documents.
+- **Sections:** Use logical hierarchy for sections and subsections.

conductor/code_styleguides/rust.md

@@ -0,0 +1,37 @@
+# Rust Style Guide
+
+## General
+- **Formatting:** Always use `rustfmt` with default settings.
+- **Linting:** Use `clippy` to catch common mistakes and improve code quality. Address all warnings.
+- **Edition:** Use the latest stable edition (currently 2024).
+
+## Naming Conventions
+- **Crates:** `snake_case` (e.g., `my_crate`)
+- **Modules:** `snake_case` (e.g., `my_module`)
+- **Types (Structs, Enums, Traits):** `UpperCamelCase` (e.g., `MyStruct`)
+- **Functions & Methods:** `snake_case` (e.g., `my_function`)
+- **Variables:** `snake_case` (e.g., `my_variable`)
+- **Constants:** `SCREAMING_SNAKE_CASE` (e.g., `MAX_SIZE`)
+- **Generics:** `UpperCamelCase`, usually single letters (e.g., `T`, `U`) or descriptive names (e.g., `Input`, `Output`).
+
+## Code Structure
+- **Imports:** Group imports by crate. Use `std` first, then external crates, then internal modules.
+- **Visibility:** Minimizing visibility is preferred. Use `pub(crate)` or `pub(super)` where appropriate.
+- **Error Handling:**
+    - Prefer `Result<T, E>` over `panic!`.
+    - Use the `?` operator for error propagation.
+    - Use `anyhow` for application-level error handling and `thiserror` for library-level errors.
+
+## Documentation
+- **Public API:** Document all public items using `///` comments.
+- **Module Level:** Include module-level documentation using `//!` at the top of the file.
+- **Examples:** Include examples in documentation where helpful.
+
+## Testing
+- **Unit Tests:** Place unit tests in a `tests` module within the same file, annotated with `#[cfg(test)]`.
+- **Integration Tests:** Place integration tests in the `tests/` directory at the crate root.
+
+## Idioms
+- **Pattern Matching:** Use pattern matching (`match`, `if let`) extensively.
+- **Ownership & Borrowing:** Follow Rust's ownership rules strictly. Avoid `clone()` unless necessary.
+- **Iterators:** Prefer iterators and combinators (`map`, `filter`, `fold`) over explicit loops.

conductor/product-guidelines.md

@@ -0,0 +1,22 @@
+# Product Guidelines
+
+## Prose Style
+- **Professional & Direct:** Use a professional tone that is helpful but concise.
+- **Clarity over Verbosity:** Explain complex actions briefly without being overly chatty.
+- **Technical Accuracy:** Use precise terminology when referring to code or system operations.
+
+## Technical Excellence
+- **Idiomatic Rust:** Follow standard Rust conventions (`rustfmt`, `clippy`).
+- **Safety First:** Prioritize memory safety and robust error handling. Use `Result` and `Option` effectively.
+- **Performance:** Ensure that file operations and LLM interactions are as efficient as possible.
+- **Modularity:** Maintain high cohesion and low coupling between crates.
+
+## Security & Privacy
+- **Minimal Privilege:** Only request permissions for necessary operations.
+- **Secret Handling:** Never log or store API keys or sensitive data in plain text.
+- **Transparency:** Clearly inform the user before executing potentially destructive commands.
+
+## UI/UX Design (CLI/TUI)
+- **Unix Philosophy:** Support piping and non-interactive modes where applicable.
+- **Visual Feedback:** Use progress indicators for long-running tasks.
+- **Accessibility:** Ensure the TUI is readable and navigable with standard terminal settings.

conductor/product.md

@@ -0,0 +1,21 @@
+# Product Guide
+
+## Initial Concept
+A robust, modular, and high-performance AI coding assistant for the terminal, built in Rust. It aims to streamline software development workflows by integrating directly with the codebase and version control systems.
+
+## Target Audience
+- **Software Developers:** The primary users who need assistance with coding tasks, refactoring, and understanding complex codebases.
+- **DevOps Engineers:** For handling infrastructure-as-code and script automation via natural language.
+
+## Core Value Proposition
+- **Performance & Safety:** Leverages Rust's memory safety and speed for a responsive CLI experience.
+- **Model Agnostic:** Supports multiple LLM backends (Anthropic, OpenAI, Ollama) giving users flexibility.
+- **Deep Integration:** Deeply integrates with the local development environment (filesystem, git, shell).
+- **Extensibility:** A plugin architecture to extend functionality with custom commands and agents.
+
+## Key Features
+- **Natural Language Interface:** Interact with the agent using plain English to perform complex tasks.
+- **Codebase Awareness:** The agent can read and analyze the project structure and file contents to provide context-aware assistance.
+- **Multi-LLM Support:** Configurable providers including Anthropic, OpenAI, and local models via Ollama.
+- **Rich TUI:** A text-based user interface for a better user experience in the terminal.
+- **Tool Ecosystem:** A suite of built-in tools for file manipulation, shell execution, and more.

conductor/setup_state.json

@@ -0,0 +1 @@
+{"last_successful_step": "3.3_initial_track_generated"}

conductor/tech-stack.md

@@ -0,0 +1,28 @@
+# Tech Stack
+
+## Core Technologies
+- **Language:** Rust (Edition 2024, v1.91+)
+- **Architecture:** Modular Workspace with specialized crates for UI, Core Agent, LLM Providers, Platform Services, and Tools.
+- **Dependency Management:** Cargo (Rust's package manager).
+
+## Crates & Components
+- **Frontends:**
+    - `crates/app/cli`: Command-line interface.
+    - `crates/app/ui`: Terminal User Interface (TUI).
+- **Core Agent:**
+    - `crates/core/agent`: The primary orchestration engine for the AI agent.
+- **LLM Providers:**
+    - `crates/llm/anthropic`: Integration with Anthropic's Claude models.
+    - `crates/llm/openai`: Integration with OpenAI's models.
+    - `crates/llm/ollama`: Integration with local models via Ollama.
+- **Platform Services:**
+    - `crates/platform/auth`: Authentication logic.
+    - `crates/platform/config`: Configuration management.
+    - `crates/platform/credentials`: Secure credential storage and retrieval.
+    - `crates/platform/hooks`: Plugin hook system.
+    - `crates/platform/permissions`: Permission and safety system.
+    - `crates/platform/plugins`: Plugin management.
+- **Functional Tools:**
+    - Specialized tools in `crates/tools/` for `bash` execution, `fs` (filesystem) operations, `web` search/fetch, `notebook` interaction, `plan` management, and more.
+- **Integration:**
+    - `crates/integration/mcp-client`: Client for the Model Context Protocol (MCP).

conductor/tracks.md

@@ -0,0 +1,5 @@
+
+---
+
+## [~] Track: Owlen Evolution - From TUI to Agentic Workstation
+*Link: [./conductor/tracks/owlen_evolution_20251226/](./conductor/tracks/owlen_evolution_20251226/)*

conductor/tracks/owlen_evolution_20251226/metadata.json

@@ -0,0 +1,8 @@
+{
+  "track_id": "owlen_evolution_20251226",
+  "type": "feature",
+  "status": "new",
+  "created_at": "2025-12-26T12:00:00Z",
+  "updated_at": "2025-12-26T12:00:00Z",
+  "description": "Transform Owlen from a blocking TUI into a non-blocking, agentic workstation."
+}

conductor/tracks/owlen_evolution_20251226/plan.md

@@ -0,0 +1,55 @@
+# Implementation Plan - Owlen Evolution
+
+## Phase 1: Asynchronous Foundation (The "Non-Blocking" Fix) [checkpoint: aed3879]
+- [x] Task: Create `Message` enum and Central Message Hub using `tokio::sync::mpsc` b0e65e4
+    - Define the `Message` enum to handle UI events, Agent responses, and System notifications.
+    - Create the channel infrastructure in `main.rs`.
+- [x] Task: Refactor `main.rs` into UI and Engine Loops 9648ddd
+    - Separate the TUI rendering loop into its own async task or thread.
+    - Create the Engine loop (Tokio task) to handle `Message` processing.
+- [x] Task: Switch LLM interaction to Streaming-only c54962b
+    - Update the LLM client to use streaming responses.
+    - Ensure the UI updates incrementally as tokens arrive.
+- [x] Task: Introduce `Arc<Mutex<AppState>>` for shared state 2bccb11
+    - Create `AppState` struct to hold conversation history, current mode, etc.
+    - Share it between UI and Engine loops safely.
+- [x] Task: Conductor - User Manual Verification 'Phase 1: Asynchronous Foundation (The "Non-Blocking" Fix)' (Protocol in workflow.md)
+
+## Phase 2: The Agentic Orchestrator (Middleware) [checkpoint: 8d1d7ba]
+- [x] Task: Create `AgentManager` struct 1e7c7cd
+    - Implement the struct to manage the agent's lifecycle and state.
+- [x] Task: Implement the "Reasoning Loop" (Thought -> Action -> Observation) 5c82a0e
+    - Build the loop logic to process user input, generate thoughts/actions, and handle results.
+    - Implement Sliding Window context management.
+    - Implement Context Summarization logic.
+- [x] Task: Develop Tool Registry System 1d7c584
+    - Define the `Tool` trait.
+    - Implement a registry to store and retrieve available tools.
+    - Implement logic to inject tool JSON schemas into the System Prompt.
+- [x] Task: Add Sub-Agent Support b6ad2f0
+    - Allow the Orchestrator to spawn sub-tasks if needed (basic implementation).
+- [x] Task: Conductor - User Manual Verification 'Phase 2: The Agentic Orchestrator (Middleware)' (Protocol in workflow.md)
+
+## Phase 3: Permission & Mode Engine
+- [x] Task: Define `AppMode` enum 37a36dd
+    - Add `Normal`, `Plan`, `AcceptAll` variants.
+    - Integrate `AppMode` into `AppState`.
+- [x] Task: Implement Permission Interceptor 159f2d3
+    - Create logic to intercept tool calls based on `AppMode`.
+    - Implement the pause/resume mechanism for the Agent Loop.
+- [x] Task: Implement UI for Permission Requests af1a61a
+    - Add a "Status Bar Prompt" component to the TUI.
+    - Connect the prompt to the Permission Interceptor via the Message Hub.
+- [ ] Task: Build "Plan Mode" logic
+    - Implement the specific logic for batching actions in Plan Mode.
+- [ ] Task: Conductor - User Manual Verification 'Phase 3: Permission & Mode Engine' (Protocol in workflow.md)
+
+## Phase 4: Extension & Integration (The "Gemini-CLI" Layer)
+- [ ] Task: Create Dynamic Extension Loader
+    - Implement scanning of `~/.config/owlen/plugins/`.
+    - Implement reading of `config.yaml` for tool configuration.
+- [ ] Task: Implement JSON-RPC Interface
+    - Create a standard interface for communicating with external tool binaries/scripts.
+- [ ] Task: Integrate External Tools into Registry
+    - Map external tools to the `Tool` trait using the JSON-RPC bridge.
+- [ ] Task: Conductor - User Manual Verification 'Phase 4: Extension & Integration (The "Gemini-CLI" Layer)' (Protocol in workflow.md)

conductor/tracks/owlen_evolution_20251226/spec.md

@@ -0,0 +1,45 @@
+# Specification: Owlen Evolution – From TUI to Agentic Workstation
+
+## Overview
+Transform Owlen from a blocking TUI into a non-blocking, agentic workstation. This involves decoupling the UI from the LLM logic, implementing a reasoning loop (Thought-Action-Observation), a robust permission system, and an extensible plugin architecture.
+
+## Functional Requirements
+
+### 1. Asynchronous Foundation
+- **Non-blocking UI:** Separate the Ratatui UI rendering loop from the LLM/Engine logic using `tokio::sync::mpsc`.
+- **Streaming Response:** LLM interactions must be streaming-only to prevent UI freezes during long generations.
+- **Central Message Hub:** Use a many-to-one or many-to-many communication pattern (via `mpsc`) to synchronize state between the background engine and the UI.
+
+### 2. Agentic Orchestrator
+- **Reasoning Loop:** Implement a core loop that follows the "Thought -> Action -> Observation" pattern.
+- **Context Management:** 
+    - **Sliding Window:** Maintain only the most recent N interactions in the immediate context.
+    - **Summarization:** Use a secondary LLM call to periodically summarize older parts of the conversation to retain long-term state without hitting token limits.
+- **Tool Registry:** Define a `Tool` trait and a system to automatically inject tool definitions (JSON Schema) into system prompts.
+
+### 3. Permission & Mode Engine
+- **Modes:** Support `Normal` (default), `Plan` (propose all actions first), and `AcceptAll` (autonomous execution).
+- **Permission Interceptor:** A mechanism to pause the agent loop when a tool requires approval.
+- **UI Integration:** Requests for permissions must be displayed in the **Status Bar** to avoid obscuring the main conversation.
+
+### 4. Extension & Integration
+- **Hybrid Extension Loader:** 
+    - Scan a default directory (e.g., `~/.config/owlen/plugins/`) for executable extensions.
+    - Allow manual configuration and overrides via `config.yaml`.
+- **JSON-RPC Interface:** Use a standardized JSON-RPC interface for communication with external extensions.
+
+## Non-Functional Requirements
+- **Performance:** UI must remain responsive (60 FPS target for rendering) even during heavy LLM tasks.
+- **Safety:** Explicit user consent required for "Write" or "Execute" operations by default.
+- **Maintainability:** Clear separation of concerns between `crates/app/ui` and `crates/core/agent`.
+
+## Acceptance Criteria
+- [ ] TUI remains responsive (can scroll/exit) while the model is "thinking" or "generating".
+- [ ] Agent can successfully call a registered tool and process its output.
+- [ ] User can approve or deny a tool execution via a status bar prompt.
+- [ ] Context window manages long conversations via summarization without crashing.
+- [ ] External scripts can be loaded as tools and invoked by the agent.
+
+## Out of Scope
+- Implementation of complex multi-agent swarms (keeping to a single orchestrator with sub-task capability).
+- Web-based UI (staying purely within TUI).

conductor/workflow.md

@@ -0,0 +1,333 @@
+# Project Workflow
+
+## Guiding Principles
+
+1. **The Plan is the Source of Truth:** All work must be tracked in `plan.md`
+2. **The Tech Stack is Deliberate:** Changes to the tech stack must be documented in `tech-stack.md` *before* implementation
+3. **Test-Driven Development:** Write unit tests before implementing functionality
+4. **High Code Coverage:** Aim for >80% code coverage for all modules
+5. **User Experience First:** Every decision should prioritize user experience
+6. **Non-Interactive & CI-Aware:** Prefer non-interactive commands. Use `CI=true` for watch-mode tools (tests, linters) to ensure single execution.
+
+## Task Workflow
+
+All tasks follow a strict lifecycle:
+
+### Standard Task Workflow
+
+1. **Select Task:** Choose the next available task from `plan.md` in sequential order
+
+2. **Mark In Progress:** Before beginning work, edit `plan.md` and change the task from `[ ]` to `[~]`
+
+3. **Write Failing Tests (Red Phase):**
+   - Create a new test file for the feature or bug fix.
+   - Write one or more unit tests that clearly define the expected behavior and acceptance criteria for the task.
+   - **CRITICAL:** Run the tests and confirm that they fail as expected. This is the "Red" phase of TDD. Do not proceed until you have failing tests.
+
+4. **Implement to Pass Tests (Green Phase):**
+   - Write the minimum amount of application code necessary to make the failing tests pass.
+   - Run the test suite again and confirm that all tests now pass. This is the "Green" phase.
+
+5. **Refactor (Optional but Recommended):**
+   - With the safety of passing tests, refactor the implementation code and the test code to improve clarity, remove duplication, and enhance performance without changing the external behavior.
+   - Rerun tests to ensure they still pass after refactoring.
+
+6. **Verify Coverage:** Run coverage reports using the project's chosen tools. For example, in a Python project, this might look like:
+   ```bash
+   pytest --cov=app --cov-report=html
+   ```
+   Target: >80% coverage for new code. The specific tools and commands will vary by language and framework.
+
+7. **Document Deviations:** If implementation differs from tech stack:
+   - **STOP** implementation
+   - Update `tech-stack.md` with new design
+   - Add dated note explaining the change
+   - Resume implementation
+
+8. **Commit Code Changes:**
+   - Stage all code changes related to the task.
+   - Propose a clear, concise commit message e.g, `feat(ui): Create basic HTML structure for calculator`.
+   - Perform the commit.
+
+9. **Attach Task Summary with Git Notes:**
+   - **Step 9.1: Get Commit Hash:** Obtain the hash of the *just-completed commit* (`git log -1 --format="%H"`).
+   - **Step 9.2: Draft Note Content:** Create a detailed summary for the completed task. This should include the task name, a summary of changes, a list of all created/modified files, and the core "why" for the change.
+   - **Step 9.3: Attach Note:** Use the `git notes` command to attach the summary to the commit.
+     ```bash
+     # The note content from the previous step is passed via the -m flag.
+     git notes add -m "<note content>" <commit_hash>
+     ```
+
+10. **Get and Record Task Commit SHA:**
+    - **Step 10.1: Update Plan:** Read `plan.md`, find the line for the completed task, update its status from `[~]` to `[x]`, and append the first 7 characters of the *just-completed commit's* commit hash.
+    - **Step 10.2: Write Plan:** Write the updated content back to `plan.md`.
+
+11. **Commit Plan Update:**
+    - **Action:** Stage the modified `plan.md` file.
+    - **Action:** Commit this change with a descriptive message (e.g., `conductor(plan): Mark task 'Create user model' as complete`).
+
+### Phase Completion Verification and Checkpointing Protocol
+
+**Trigger:** This protocol is executed immediately after a task is completed that also concludes a phase in `plan.md`.
+
+1.  **Announce Protocol Start:** Inform the user that the phase is complete and the verification and checkpointing protocol has begun.
+
+2.  **Ensure Test Coverage for Phase Changes:**
+    -   **Step 2.1: Determine Phase Scope:** To identify the files changed in this phase, you must first find the starting point. Read `plan.md` to find the Git commit SHA of the *previous* phase's checkpoint. If no previous checkpoint exists, the scope is all changes since the first commit.
+    -   **Step 2.2: List Changed Files:** Execute `git diff --name-only <previous_checkpoint_sha> HEAD` to get a precise list of all files modified during this phase.
+    -   **Step 2.3: Verify and Create Tests:** For each file in the list:
+        -   **CRITICAL:** First, check its extension. Exclude non-code files (e.g., `.json`, `.md`, `.yaml`).
+        -   For each remaining code file, verify a corresponding test file exists.
+        -   If a test file is missing, you **must** create one. Before writing the test, **first, analyze other test files in the repository to determine the correct naming convention and testing style.** The new tests **must** validate the functionality described in this phase's tasks (`plan.md`).
+
+3.  **Execute Automated Tests with Proactive Debugging:**
+    -   Before execution, you **must** announce the exact shell command you will use to run the tests.
+    -   **Example Announcement:** "I will now run the automated test suite to verify the phase. **Command:** `CI=true npm test`"
+    -   Execute the announced command.
+    -   If tests fail, you **must** inform the user and begin debugging. You may attempt to propose a fix a **maximum of two times**. If the tests still fail after your second proposed fix, you **must stop**, report the persistent failure, and ask the user for guidance.
+
+4.  **Propose a Detailed, Actionable Manual Verification Plan:**
+    -   **CRITICAL:** To generate the plan, first analyze `product.md`, `product-guidelines.md`, and `plan.md` to determine the user-facing goals of the completed phase.
+    -   You **must** generate a step-by-step plan that walks the user through the verification process, including any necessary commands and specific, expected outcomes.
+    -   The plan you present to the user **must** follow this format:
+
+        **For a Frontend Change:**
+        ```
+        The automated tests have passed. For manual verification, please follow these steps:
+
+        **Manual Verification Steps:**
+        1.  **Start the development server with the command:** `npm run dev`
+        2.  **Open your browser to:** `http://localhost:3000`
+        3.  **Confirm that you see:** The new user profile page, with the user's name and email displayed correctly.
+        ```
+
+        **For a Backend Change:**
+        ```
+        The automated tests have passed. For manual verification, please follow these steps:
+
+        **Manual Verification Steps:**
+        1.  **Ensure the server is running.**
+        2.  **Execute the following command in your terminal:** `curl -X POST http://localhost:8080/api/v1/users -d '{"name": "test"}'`
+        3.  **Confirm that you receive:** A JSON response with a status of `201 Created`.
+        ```
+
+5.  **Await Explicit User Feedback:**
+    -   After presenting the detailed plan, ask the user for confirmation: "**Does this meet your expectations? Please confirm with yes or provide feedback on what needs to be changed.**"
+    -   **PAUSE** and await the user's response. Do not proceed without an explicit yes or confirmation.
+
+6.  **Create Checkpoint Commit:**
+    -   Stage all changes. If no changes occurred in this step, proceed with an empty commit.
+    -   Perform the commit with a clear and concise message (e.g., `conductor(checkpoint): Checkpoint end of Phase X`).
+
+7.  **Attach Auditable Verification Report using Git Notes:**
+    -   **Step 8.1: Draft Note Content:** Create a detailed verification report including the automated test command, the manual verification steps, and the user's confirmation.
+    -   **Step 8.2: Attach Note:** Use the `git notes` command and the full commit hash from the previous step to attach the full report to the checkpoint commit.
+
+8.  **Get and Record Phase Checkpoint SHA:**
+    -   **Step 7.1: Get Commit Hash:** Obtain the hash of the *just-created checkpoint commit* (`git log -1 --format="%H"`).
+    -   **Step 7.2: Update Plan:** Read `plan.md`, find the heading for the completed phase, and append the first 7 characters of the commit hash in the format `[checkpoint: <sha>]`.
+    -   **Step 7.3: Write Plan:** Write the updated content back to `plan.md`.
+
+9. **Commit Plan Update:**
+    - **Action:** Stage the modified `plan.md` file.
+    - **Action:** Commit this change with a descriptive message following the format `conductor(plan): Mark phase '<PHASE NAME>' as complete`.
+
+10.  **Announce Completion:** Inform the user that the phase is complete and the checkpoint has been created, with the detailed verification report attached as a git note.
+
+### Quality Gates
+
+Before marking any task complete, verify:
+
+- [ ] All tests pass
+- [ ] Code coverage meets requirements (>80%)
+- [ ] Code follows project's code style guidelines (as defined in `code_styleguides/`)
+- [ ] All public functions/methods are documented (e.g., docstrings, JSDoc, GoDoc)
+- [ ] Type safety is enforced (e.g., type hints, TypeScript types, Go types)
+- [ ] No linting or static analysis errors (using the project's configured tools)
+- [ ] Works correctly on mobile (if applicable)
+- [ ] Documentation updated if needed
+- [ ] No security vulnerabilities introduced
+
+## Development Commands
+
+**AI AGENT INSTRUCTION: This section should be adapted to the project's specific language, framework, and build tools.**
+
+### Setup
+```bash
+# Example: Commands to set up the development environment (e.g., install dependencies, configure database)
+# e.g., for a Node.js project: npm install
+# e.g., for a Go project: go mod tidy
+```
+
+### Daily Development
+```bash
+# Example: Commands for common daily tasks (e.g., start dev server, run tests, lint, format)
+# e.g., for a Node.js project: npm run dev, npm test, npm run lint
+# e.g., for a Go project: go run main.go, go test ./..., go fmt ./...
+```
+
+### Before Committing
+```bash
+# Example: Commands to run all pre-commit checks (e.g., format, lint, type check, run tests)
+# e.g., for a Node.js project: npm run check
+# e.g., for a Go project: make check (if a Makefile exists)
+```
+
+## Testing Requirements
+
+### Unit Testing
+- Every module must have corresponding tests.
+- Use appropriate test setup/teardown mechanisms (e.g., fixtures, beforeEach/afterEach).
+- Mock external dependencies.
+- Test both success and failure cases.
+
+### Integration Testing
+- Test complete user flows
+- Verify database transactions
+- Test authentication and authorization
+- Check form submissions
+
+### Mobile Testing
+- Test on actual iPhone when possible
+- Use Safari developer tools
+- Test touch interactions
+- Verify responsive layouts
+- Check performance on 3G/4G
+
+## Code Review Process
+
+### Self-Review Checklist
+Before requesting review:
+
+1. **Functionality**
+   - Feature works as specified
+   - Edge cases handled
+   - Error messages are user-friendly
+
+2. **Code Quality**
+   - Follows style guide
+   - DRY principle applied
+   - Clear variable/function names
+   - Appropriate comments
+
+3. **Testing**
+   - Unit tests comprehensive
+   - Integration tests pass
+   - Coverage adequate (>80%)
+
+4. **Security**
+   - No hardcoded secrets
+   - Input validation present
+   - SQL injection prevented
+   - XSS protection in place
+
+5. **Performance**
+   - Database queries optimized
+   - Images optimized
+   - Caching implemented where needed
+
+6. **Mobile Experience**
+   - Touch targets adequate (44x44px)
+   - Text readable without zooming
+   - Performance acceptable on mobile
+   - Interactions feel native
+
+## Commit Guidelines
+
+### Message Format
+```
+<type>(<scope>): <description>
+
+[optional body]
+
+[optional footer]
+```
+
+### Types
+- `feat`: New feature
+- `fix`: Bug fix
+- `docs`: Documentation only
+- `style`: Formatting, missing semicolons, etc.
+- `refactor`: Code change that neither fixes a bug nor adds a feature
+- `test`: Adding missing tests
+- `chore`: Maintenance tasks
+
+### Examples
+```bash
+git commit -m "feat(auth): Add remember me functionality"
+git commit -m "fix(posts): Correct excerpt generation for short posts"
+git commit -m "test(comments): Add tests for emoji reaction limits"
+git commit -m "style(mobile): Improve button touch targets"
+```
+
+## Definition of Done
+
+A task is complete when:
+
+1. All code implemented to specification
+2. Unit tests written and passing
+3. Code coverage meets project requirements
+4. Documentation complete (if applicable)
+5. Code passes all configured linting and static analysis checks
+6. Works beautifully on mobile (if applicable)
+7. Implementation notes added to `plan.md`
+8. Changes committed with proper message
+9. Git note with task summary attached to the commit
+
+## Emergency Procedures
+
+### Critical Bug in Production
+1. Create hotfix branch from main
+2. Write failing test for bug
+3. Implement minimal fix
+4. Test thoroughly including mobile
+5. Deploy immediately
+6. Document in plan.md
+
+### Data Loss
+1. Stop all write operations
+2. Restore from latest backup
+3. Verify data integrity
+4. Document incident
+5. Update backup procedures
+
+### Security Breach
+1. Rotate all secrets immediately
+2. Review access logs
+3. Patch vulnerability
+4. Notify affected users (if any)
+5. Document and update security procedures
+
+## Deployment Workflow
+
+### Pre-Deployment Checklist
+- [ ] All tests passing
+- [ ] Coverage >80%
+- [ ] No linting errors
+- [ ] Mobile testing complete
+- [ ] Environment variables configured
+- [ ] Database migrations ready
+- [ ] Backup created
+
+### Deployment Steps
+1. Merge feature branch to main
+2. Tag release with version
+3. Push to deployment service
+4. Run database migrations
+5. Verify deployment
+6. Test critical paths
+7. Monitor for errors
+
+### Post-Deployment
+1. Monitor analytics
+2. Check error logs
+3. Gather user feedback
+4. Plan next iteration
+
+## Continuous Improvement
+
+- Review workflow weekly
+- Update based on pain points
+- Document lessons learned
+- Optimize for user happiness
+- Keep things simple and maintainable

crates/app/cli/.gitignore

@@ -0,0 +1,22 @@
+/target
+### Rust template
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+### rust-analyzer template
+# Can be generated by other build systems other than cargo (ex: bazelbuild/rust_rules)
+rust-project.json
+
+

crates/app/cli/Cargo.toml

@@ -0,0 +1,41 @@
+[package]
+name = "owlen"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+clap = { version = "4.5", features = ["derive"] }
+tokio = { version = "1.39", features = ["macros", "rt-multi-thread"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+color-eyre = "0.6"
+agent-core = { path = "../../core/agent" }
+llm-core = { path = "../../llm/core" }
+llm-ollama = { path = "../../llm/ollama" }
+llm-anthropic = { path = "../../llm/anthropic" }
+llm-openai = { path = "../../llm/openai" }
+tools-fs = { path = "../../tools/fs" }
+tools-bash = { path = "../../tools/bash" }
+tools-slash = { path = "../../tools/slash" }
+tools-plan = { path = "../../tools/plan" }
+auth-manager = { path = "../../platform/auth" }
+config-agent = { package = "config-agent", path = "../../platform/config" }
+permissions = { path = "../../platform/permissions" }
+hooks = { path = "../../platform/hooks" }
+plugins = { path = "../../platform/plugins" }
+ui = { path = "../ui" }
+atty = "0.2"
+futures-util = "0.3.31"
+rpassword = "7"
+open = "5"
+futures = "0.3.31"
+async-trait = "0.1.89"
+
+[dev-dependencies]
+assert_cmd = "2.0"
+predicates = "3.1"
+httpmock = "0.7"
+tokio = { version = "1.39", features = ["macros", "rt-multi-thread"] }
+tempfile = "3.23.0"

crates/app/cli/README.md

@@ -0,0 +1,29 @@
+# Owlen CLI
+
+The command-line interface for the Owlen AI agent.
+
+## Features
+- **Interactive Chat:** Communicate with the AI agent directly from your terminal.
+- **Tool Integration:** Built-in support for filesystem operations, bash execution, and more.
+- **Provider Management:** Easily switch between different LLM providers (Ollama, Anthropic, OpenAI).
+- **Session Management:** Persist conversation history and resume previous sessions.
+- **Secure Authentication:** Managed authentication flows for major AI providers.
+
+## Usage
+
+### Direct Invocation
+```bash
+# Start an interactive chat session
+owlen
+
+# Ask a single question
+owlen "How do I list files in Rust?"
+```
+
+### Commands
+- `owlen config`: View or modify agent configuration.
+- `owlen login <provider>`: Authenticate with a specific LLM provider.
+- `owlen session`: Manage chat sessions.
+
+## Configuration
+Owlen uses a global configuration file located at `~/.config/owlen/config.toml`. You can also provide project-specific settings via an `.owlen.toml` file in your project root.

crates/app/cli/src/agent_manager.rs

@@ -0,0 +1,584 @@
+use std::sync::Arc;
+use tokio::sync::{mpsc, Mutex};
+use agent_core::state::{AppState, AppMode};
+use agent_core::{PlanStep, AccumulatedPlanStatus};
+use llm_core::{LlmProvider, ChatMessage, ChatOptions};
+use color_eyre::eyre::Result;
+use agent_core::messages::{Message, AgentResponse};
+use futures::StreamExt;
+use ui::ProviderManager;
+
+/// Client source - either a fixed client or dynamic via ProviderManager
+enum ClientSource {
+    /// Fixed client (legacy mode)
+    Fixed(Arc<dyn LlmProvider>),
+    /// Dynamic via ProviderManager (supports provider/model switching)
+    Dynamic(Arc<Mutex<ProviderManager>>),
+}
+
+/// Manages the lifecycle and state of the agent
+pub struct AgentManager {
+    client_source: ClientSource,
+    state: Arc<Mutex<AppState>>,
+    tx_ui: Option<mpsc::Sender<Message>>,
+}
+
+impl AgentManager {
+    /// Create a new AgentManager with a fixed client (legacy mode)
+    pub fn new(client: Arc<dyn LlmProvider>, state: Arc<Mutex<AppState>>) -> Self {
+        Self {
+            client_source: ClientSource::Fixed(client),
+            state,
+            tx_ui: None,
+        }
+    }
+
+    /// Create a new AgentManager with a dynamic ProviderManager
+    pub fn with_provider_manager(
+        provider_manager: Arc<Mutex<ProviderManager>>,
+        state: Arc<Mutex<AppState>>,
+    ) -> Self {
+        Self {
+            client_source: ClientSource::Dynamic(provider_manager),
+            state,
+            tx_ui: None,
+        }
+    }
+
+    /// Set the UI message sender
+    pub fn with_ui_sender(mut self, tx: mpsc::Sender<Message>) -> Self {
+        self.tx_ui = Some(tx);
+        self
+    }
+
+    /// Get the current LLM client (resolves dynamic provider if needed)
+    async fn get_client(&self) -> Result<Arc<dyn LlmProvider>> {
+        match &self.client_source {
+            ClientSource::Fixed(client) => Ok(Arc::clone(client)),
+            ClientSource::Dynamic(manager) => {
+                let mut guard = manager.lock().await;
+                guard.get_provider()
+                    .map_err(|e| color_eyre::eyre::eyre!("Failed to get provider: {}", e))
+            }
+        }
+    }
+
+    /// Get the current model name
+    async fn get_model(&self) -> String {
+        match &self.client_source {
+            ClientSource::Fixed(client) => client.model().to_string(),
+            ClientSource::Dynamic(manager) => {
+                let guard = manager.lock().await;
+                guard.current_model().to_string()
+            }
+        }
+    }
+
+    /// Get a reference to the shared state
+    #[allow(dead_code)]
+    pub fn state(&self) -> &Arc<Mutex<AppState>> {
+        &self.state
+    }
+
+    /// Check if a tool execution is permitted
+    pub async fn check_permission(&self, tool: &str, context: Option<&str>) -> Result<bool> {
+        let mode = {
+            let guard = self.state.lock().await;
+            guard.mode
+        };
+
+        match mode {
+            AppMode::AcceptAll => Ok(true),
+            AppMode::Normal | AppMode::Plan => {
+                // Request permission from UI
+                if let Some(tx) = &self.tx_ui {
+                    let _ = tx.send(Message::AgentResponse(AgentResponse::PermissionRequest {
+                        tool: tool.to_string(),
+                        context: context.map(|s| s.to_string()),
+                    })).await;
+
+                    // Wait for result
+                    let notify = {
+                        let guard = self.state.lock().await;
+                        guard.permission_notify.clone()
+                    };
+
+                    notify.notified().await;
+
+                    let result = {
+                        let mut guard = self.state.lock().await;
+                        guard.last_permission_result.take().unwrap_or(false)
+                    };
+
+                    Ok(result)
+                } else {
+                    // No UI sender, default to deny for safety
+                    Ok(false)
+                }
+            }
+        }
+    }
+
+    /// Spawn a sub-agent for a specific task
+    pub async fn spawn_sub_agent(&self, _task: &str) -> Result<String> {
+        // Basic placeholder implementation for Sub-Agent support
+        Ok("Sub-agent task completed (mock)".to_string())
+    }
+
+    /// Execute approved steps from the accumulated plan
+    async fn execute_approved_plan_steps(&self) -> Result<()> {
+        // Take the approval and apply it to the plan
+        let approval = {
+            let mut guard = self.state.lock().await;
+            guard.take_plan_approval()
+        };
+
+        if let Some(approval) = approval {
+            // Apply approval to plan
+            {
+                let mut guard = self.state.lock().await;
+                if let Some(plan) = guard.current_plan_mut() {
+                    approval.apply_to(plan);
+                    plan.start_execution();
+                }
+            }
+        }
+
+        // Get the approved steps
+        let approved_steps: Vec<_> = {
+            let guard = self.state.lock().await;
+            if let Some(plan) = guard.current_plan() {
+                plan.approved_steps()
+                    .into_iter()
+                    .map(|s| (s.id.clone(), s.tool.clone(), s.args.clone()))
+                    .collect()
+            } else {
+                Vec::new()
+            }
+        };
+
+        let total_steps = approved_steps.len();
+        let mut executed = 0;
+        let mut skipped = 0;
+
+        // Execute each approved step
+        for (index, (id, tool_name, arguments)) in approved_steps.into_iter().enumerate() {
+            // Notify UI of execution progress
+            if let Some(tx) = &self.tx_ui {
+                let _ = tx.send(Message::AgentResponse(AgentResponse::PlanExecuting {
+                    step_id: id.clone(),
+                    step_index: index,
+                    total_steps,
+                })).await;
+            }
+
+            // Execute the tool
+            let dummy_perms = permissions::PermissionManager::new(permissions::Mode::Code);
+            let ctx = agent_core::ToolContext::new();
+
+            match agent_core::execute_tool(&tool_name, &arguments, &dummy_perms, &ctx).await {
+                Ok(result) => {
+                    let mut guard = self.state.lock().await;
+                    guard.add_message(ChatMessage::tool_result(&id, result));
+                    executed += 1;
+                }
+                Err(e) => {
+                    let mut guard = self.state.lock().await;
+                    guard.add_message(ChatMessage::tool_result(&id, format!("Error: {}", e)));
+                    skipped += 1;
+                }
+            }
+        }
+
+        // Mark plan as complete and notify UI
+        {
+            let mut guard = self.state.lock().await;
+            if let Some(plan) = guard.current_plan_mut() {
+                plan.complete();
+            }
+        }
+
+        if let Some(tx) = &self.tx_ui {
+            let _ = tx.send(Message::AgentResponse(AgentResponse::PlanExecutionComplete {
+                executed,
+                skipped,
+            })).await;
+        }
+
+        // Clear the plan
+        {
+            let mut guard = self.state.lock().await;
+            guard.clear_plan();
+        }
+
+        Ok(())
+    }
+
+    /// Execute a single tool call (used by engine for plan step execution)
+    pub async fn execute_single_tool(&self, tool_name: &str, args: &serde_json::Value) -> Result<String> {
+        let dummy_perms = permissions::PermissionManager::new(permissions::Mode::Code);
+        let ctx = agent_core::ToolContext::new();
+
+        let result = agent_core::execute_tool(tool_name, args, &dummy_perms, &ctx).await?;
+
+        // Notify UI of tool execution
+        if let Some(tx) = &self.tx_ui {
+            let _ = tx.send(Message::AgentResponse(AgentResponse::ToolCall {
+                name: tool_name.to_string(),
+                args: args.to_string(),
+            })).await;
+        }
+
+        Ok(result)
+    }
+
+    /// Execute the full reasoning loop until a final response is reached
+    pub async fn run(&self, input: &str) -> Result<()> {
+        let tools = agent_core::get_tool_definitions();
+
+        // 1. Add user message to history
+        {
+            let mut guard = self.state.lock().await;
+            guard.add_message(ChatMessage::user(input.to_string()));
+        }
+
+        let max_iterations = 10;
+        let mut iteration = 0;
+
+        loop {
+            iteration += 1;
+            if iteration > max_iterations {
+                if let Some(tx) = &self.tx_ui {
+                    let _ = tx.send(Message::AgentResponse(AgentResponse::Error("Max iterations reached".to_string()))).await;
+                }
+                break;
+            }
+
+            // 2. Prepare context
+            let messages = {
+                let guard = self.state.lock().await;
+                guard.messages.clone()
+            };
+
+            // 3. Get current client (supports dynamic provider switching)
+            let client = match self.get_client().await {
+                Ok(c) => c,
+                Err(e) => {
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::Error(e.to_string()))).await;
+                    }
+                    return Err(e);
+                }
+            };
+
+            let options = ChatOptions::new(client.model());
+
+            // 4. Call LLM with streaming
+            let stream_result = client.chat_stream(&messages, &options, Some(&tools)).await;
+            let mut stream = match stream_result {
+                Ok(s) => s,
+                Err(e) => {
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::Error(e.to_string()))).await;
+                    }
+                    return Err(e.into());
+                }
+            };
+            let mut response_content = String::new();
+            let mut tool_calls_builder = agent_core::ToolCallsBuilder::new();
+
+            while let Some(chunk_result) = stream.next().await {
+                let chunk = match chunk_result {
+                    Ok(c) => c,
+                    Err(e) => {
+                        if let Some(tx) = &self.tx_ui {
+                            let _ = tx.send(Message::AgentResponse(AgentResponse::Error(e.to_string()))).await;
+                        }
+                        return Err(e.into());
+                    }
+                };
+
+                if let Some(content) = &chunk.content {
+                    response_content.push_str(content);
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::Token(content.clone()))).await;
+                    }
+                }
+
+                if let Some(deltas) = &chunk.tool_calls {
+                    tool_calls_builder.add_deltas(deltas);
+                }
+            }
+
+            drop(stream);
+
+            let tool_calls = tool_calls_builder.build();
+
+            // Add assistant message to history
+            {
+                let mut guard = self.state.lock().await;
+                guard.add_message(ChatMessage {
+                    role: llm_core::Role::Assistant,
+                    content: if response_content.is_empty() { None } else { Some(response_content.clone()) },
+                    tool_calls: if tool_calls.is_empty() { None } else { Some(tool_calls.clone()) },
+                    tool_call_id: None,
+                    name: None,
+                });
+            }
+
+            let mode = {
+                let guard = self.state.lock().await;
+                guard.mode
+            };
+
+            // Check if LLM finished (no tool calls)
+            if tool_calls.is_empty() {
+                // Check if we have an accumulated plan with steps
+                let has_plan_steps = {
+                    let guard = self.state.lock().await;
+                    guard.accumulated_plan.as_ref().map(|p| !p.steps.is_empty()).unwrap_or(false)
+                };
+
+                if mode == AppMode::Plan && has_plan_steps {
+                    // In Plan mode WITH steps: finalize and wait for user approval
+                    let (total_steps, status) = {
+                        let mut guard = self.state.lock().await;
+                        if let Some(plan) = guard.current_plan_mut() {
+                            plan.finalize();
+                            (plan.steps.len(), plan.status.clone())
+                        } else {
+                            (0, AccumulatedPlanStatus::Completed)
+                        }
+                    };
+
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::PlanComplete {
+                            total_steps,
+                            status,
+                        })).await;
+                    }
+
+                    // Wait for user approval
+                    let notify = {
+                        let guard = self.state.lock().await;
+                        guard.plan_notify.clone()
+                    };
+                    notify.notified().await;
+
+                    // Execute approved steps
+                    self.execute_approved_plan_steps().await?;
+
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::Complete)).await;
+                    }
+                } else {
+                    // Normal mode OR Plan mode with no steps: just complete
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::Complete)).await;
+                    }
+                }
+                break;
+            }
+
+            // Handle Plan mode: accumulate steps instead of executing
+            if mode == AppMode::Plan {
+                // Ensure we have an active plan
+                {
+                    let mut guard = self.state.lock().await;
+                    if guard.accumulated_plan.is_none() {
+                        guard.start_plan();
+                    }
+                    if let Some(plan) = guard.current_plan_mut() {
+                        plan.next_turn();
+                    }
+                }
+
+                // Add each tool call as a plan step
+                for call in &tool_calls {
+                    let step = PlanStep::new(
+                        call.id.clone(),
+                        iteration,
+                        call.function.name.clone(),
+                        call.function.arguments.clone(),
+                    ).with_rationale(response_content.clone());
+
+                    // Add to accumulated plan
+                    {
+                        let mut guard = self.state.lock().await;
+                        if let Some(plan) = guard.current_plan_mut() {
+                            plan.add_step(step.clone());
+                        }
+                    }
+
+                    // Notify UI of new step
+                    if let Some(tx) = &self.tx_ui {
+                        let _ = tx.send(Message::AgentResponse(AgentResponse::PlanStepAdded(step))).await;
+                    }
+                }
+
+                // Feed mock results back to LLM so it can continue reasoning
+                for call in &tool_calls {
+                    let mock_result = format!(
+                        "[Plan Mode] Step '{}' recorded for approval. Continue proposing steps or stop to finalize.",
+                        call.function.name
+                    );
+                    let mut guard = self.state.lock().await;
+                    guard.add_message(ChatMessage::tool_result(&call.id, mock_result));
+                }
+
+                // Continue loop - agent will propose more steps or complete
+                continue;
+            }
+
+            // Normal/AcceptAll mode: Execute tools immediately
+            for call in tool_calls {
+                let tool_name = call.function.name.clone();
+                let arguments = call.function.arguments.clone();
+
+                if let Some(tx) = &self.tx_ui {
+                    let _ = tx.send(Message::AgentResponse(AgentResponse::ToolCall {
+                        name: tool_name.clone(),
+                        args: arguments.to_string(),
+                    })).await;
+                }
+
+                // Check permission
+                let context = match tool_name.as_str() {
+                    "read" | "write" | "edit" => arguments.get("path").and_then(|v| v.as_str()),
+                    "bash" => arguments.get("command").and_then(|v| v.as_str()),
+                    _ => None,
+                };
+
+                let allowed = self.check_permission(&tool_name, context).await?;
+
+                if allowed {
+                    // Execute tool
+                    // We need a dummy PermissionManager that always allows because we already checked
+                    let dummy_perms = permissions::PermissionManager::new(permissions::Mode::Code);
+                    let ctx = agent_core::ToolContext::new(); // TODO: Use real context
+                    
+                    match agent_core::execute_tool(&tool_name, &arguments, &dummy_perms, &ctx).await {
+                        Ok(result) => {
+                            let mut guard = self.state.lock().await;
+                            guard.add_message(ChatMessage::tool_result(&call.id, result));
+                        }
+                        Err(e) => {
+                            let mut guard = self.state.lock().await;
+                            guard.add_message(ChatMessage::tool_result(&call.id, format!("Error: {}", e)));
+                        }
+                    }
+                } else {
+                    let mut guard = self.state.lock().await;
+                    guard.add_message(ChatMessage::tool_result(&call.id, "Permission denied by user".to_string()));
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Execute the reasoning loop: User Input -> LLM -> Thought/Action -> Result -> LLM
+    pub async fn step(&self, input: &str) -> Result<String> {
+        // 1. Add user message to history
+        {
+            let mut guard = self.state.lock().await;
+            guard.add_message(ChatMessage::user(input.to_string()));
+        }
+
+        // 2. Prepare context
+        let messages = {
+            let guard = self.state.lock().await;
+            guard.messages.clone()
+        };
+
+        // 3. Get current client
+        let client = self.get_client().await?;
+        let options = ChatOptions::new(client.model());
+        let response = client.chat(&messages, &options, None).await?;
+
+        // 4. Process response
+        if let Some(content) = response.content {
+             let mut guard = self.state.lock().await;
+             guard.add_message(ChatMessage::assistant(content.clone()));
+             return Ok(content);
+        }
+
+        Ok(String::new())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use llm_core::{Tool, ChunkStream, ChatResponse};
+    use async_trait::async_trait;
+    use agent_core::messages::UserAction;
+    
+    struct MockProvider;
+    #[async_trait]
+    impl LlmProvider for MockProvider {
+        fn name(&self) -> &str { "mock" }
+        fn model(&self) -> &str { "mock" }
+        async fn chat_stream(
+            &self,
+            _messages: &[ChatMessage],
+            _options: &ChatOptions,
+            _tools: Option<&[Tool]>,
+        ) -> Result<ChunkStream, llm_core::LlmError> {
+            unimplemented!()
+        }
+        async fn chat(
+            &self,
+            _messages: &[ChatMessage],
+            _options: &ChatOptions,
+            _tools: Option<&[Tool]>,
+        ) -> Result<ChatResponse, llm_core::LlmError> {
+             Ok(ChatResponse {
+                content: Some("Mock Response".to_string()),
+                tool_calls: None,
+                usage: None,
+            })
+        }
+    }
+
+    #[tokio::test]
+    async fn test_reasoning_loop_basic() {
+        let client = Arc::new(MockProvider);
+        let state = Arc::new(Mutex::new(AppState::new()));
+        let manager = AgentManager::new(client, state);
+        
+        let response = manager.step("Hello").await.unwrap();
+        assert_eq!(response, "Mock Response");
+    }
+
+    #[tokio::test]
+    async fn test_sub_agent_spawn() {
+        let client = Arc::new(MockProvider);
+        let state = Arc::new(Mutex::new(AppState::new()));
+        let manager = AgentManager::new(client, state);
+        
+        let result = manager.spawn_sub_agent("Do something").await.unwrap();
+        assert_eq!(result, "Sub-agent task completed (mock)");
+    }
+
+    #[tokio::test]
+    async fn test_permission_request() {
+        let client = Arc::new(MockProvider);
+        let state = Arc::new(Mutex::new(AppState::new()));
+        let (tx, mut rx) = mpsc::channel(1);
+        
+        let manager = AgentManager::new(client, state.clone()).with_ui_sender(tx);
+        
+        let state_clone = state.clone();
+        tokio::spawn(async move {
+            // Simulate UI receiving request and granting permission
+            if let Some(Message::AgentResponse(AgentResponse::PermissionRequest { .. })) = rx.recv().await {
+                let mut guard = state_clone.lock().await;
+                guard.set_permission_result(true);
+            }
+        });
+
+        let allowed = manager.check_permission("bash", Some("ls")).await.unwrap();
+        assert!(allowed);
+    }
+}

crates/app/cli/src/commands.rs

@@ -0,0 +1,382 @@
+//! Built-in commands for CLI and TUI
+//!
+//! Provides handlers for /help, /mcp, /hooks, /clear, and other built-in commands.
+
+use ui::{CommandInfo, CommandOutput, OutputFormat, TreeNode, ListItem};
+use permissions::PermissionManager;
+use hooks::HookManager;
+use plugins::PluginManager;
+use agent_core::SessionStats;
+
+/// Result of executing a built-in command
+pub enum CommandResult {
+    /// Command produced output to display
+    Output(CommandOutput),
+    /// Command was handled but produced no output (e.g., /clear)
+    Handled,
+    /// Command was not recognized
+    NotFound,
+    /// Command needs to exit the session
+    Exit,
+}
+
+/// Built-in command handler
+pub struct BuiltinCommands<'a> {
+    plugin_manager: Option<&'a PluginManager>,
+    hook_manager: Option<&'a HookManager>,
+    permission_manager: Option<&'a PermissionManager>,
+    stats: Option<&'a SessionStats>,
+}
+
+impl<'a> BuiltinCommands<'a> {
+    pub fn new() -> Self {
+        Self {
+            plugin_manager: None,
+            hook_manager: None,
+            permission_manager: None,
+            stats: None,
+        }
+    }
+
+    pub fn with_plugins(mut self, pm: &'a PluginManager) -> Self {
+        self.plugin_manager = Some(pm);
+        self
+    }
+
+    pub fn with_hooks(mut self, hm: &'a HookManager) -> Self {
+        self.hook_manager = Some(hm);
+        self
+    }
+
+    pub fn with_permissions(mut self, perms: &'a PermissionManager) -> Self {
+        self.permission_manager = Some(perms);
+        self
+    }
+
+    pub fn with_stats(mut self, stats: &'a SessionStats) -> Self {
+        self.stats = Some(stats);
+        self
+    }
+
+    /// Execute a built-in command
+    pub fn execute(&self, command: &str) -> CommandResult {
+        let parts: Vec<&str> = command.split_whitespace().collect();
+        let cmd = parts.first().map(|s| s.trim_start_matches('/'));
+
+        match cmd {
+            Some("help") | Some("?") => CommandResult::Output(self.help()),
+            Some("mcp") => CommandResult::Output(self.mcp()),
+            Some("hooks") => CommandResult::Output(self.hooks()),
+            Some("plugins") => CommandResult::Output(self.plugins()),
+            Some("status") => CommandResult::Output(self.status()),
+            Some("permissions") | Some("perms") => CommandResult::Output(self.permissions()),
+            Some("clear") => CommandResult::Handled,
+            Some("exit") | Some("quit") | Some("q") => CommandResult::Exit,
+            _ => CommandResult::NotFound,
+        }
+    }
+
+    /// Generate help output
+    fn help(&self) -> CommandOutput {
+        let mut commands = vec![
+            // Built-in commands
+            CommandInfo::new("help", "Show available commands", "builtin"),
+            CommandInfo::new("clear", "Clear the screen", "builtin"),
+            CommandInfo::new("status", "Show session status", "builtin"),
+            CommandInfo::new("permissions", "Show permission settings", "builtin"),
+            CommandInfo::new("mcp", "List MCP servers and tools", "builtin"),
+            CommandInfo::new("hooks", "Show loaded hooks", "builtin"),
+            CommandInfo::new("plugins", "Show loaded plugins", "builtin"),
+            CommandInfo::new("checkpoint", "Save session state", "builtin"),
+            CommandInfo::new("checkpoints", "List saved checkpoints", "builtin"),
+            CommandInfo::new("rewind", "Restore from checkpoint", "builtin"),
+            CommandInfo::new("compact", "Compact conversation context", "builtin"),
+            CommandInfo::new("exit", "Exit the session", "builtin"),
+        ];
+
+        // Add plugin commands
+        if let Some(pm) = self.plugin_manager {
+            for plugin in pm.plugins() {
+                for cmd_name in plugin.all_command_names() {
+                    commands.push(CommandInfo::new(
+                        &cmd_name,
+                        &format!("Plugin command from {}", plugin.manifest.name),
+                        &format!("plugin:{}", plugin.manifest.name),
+                    ));
+                }
+            }
+        }
+
+        CommandOutput::help_table(&commands)
+    }
+
+    /// Generate MCP servers output
+    fn mcp(&self) -> CommandOutput {
+        let mut servers: Vec<(String, Vec<String>)> = vec![];
+
+        // Get MCP servers from plugins
+        if let Some(pm) = self.plugin_manager {
+            for plugin in pm.plugins() {
+                // Check for .mcp.json in plugin directory
+                let mcp_path = plugin.base_path.join(".mcp.json");
+                if mcp_path.exists() {
+                    if let Ok(content) = std::fs::read_to_string(&mcp_path) {
+                        if let Ok(config) = serde_json::from_str::<serde_json::Value>(&content) {
+                            if let Some(mcpservers) = config.get("mcpServers").and_then(|v| v.as_object()) {
+                                for (name, _) in mcpservers {
+                                    servers.push((
+                                        format!("{} ({})", name, plugin.manifest.name),
+                                        vec!["(connect to discover tools)".to_string()],
+                                    ));
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        if servers.is_empty() {
+            CommandOutput::new(OutputFormat::Text {
+                content: "No MCP servers configured.\n\nAdd MCP servers in plugin .mcp.json files.".to_string(),
+            })
+        } else {
+            CommandOutput::mcp_tree(&servers)
+        }
+    }
+
+    /// Generate hooks output
+    fn hooks(&self) -> CommandOutput {
+        let mut hooks_list: Vec<(String, String, bool)> = vec![];
+
+        // Check for file-based hooks in .owlen/hooks/
+        let hook_events = ["PreToolUse", "PostToolUse", "SessionStart", "SessionEnd",
+                          "UserPromptSubmit", "PreCompact", "Stop", "SubagentStop"];
+
+        for event in hook_events {
+            let path = format!(".owlen/hooks/{}", event);
+            let exists = std::path::Path::new(&path).exists();
+            if exists {
+                hooks_list.push((event.to_string(), path, true));
+            }
+        }
+
+        // Get hooks from plugins
+        if let Some(pm) = self.plugin_manager {
+            for plugin in pm.plugins() {
+                if let Some(hooks_config) = plugin.load_hooks_config().ok().flatten() {
+                    // hooks_config.hooks is HashMap<String, Vec<HookMatcher>>
+                    for (event_name, matchers) in &hooks_config.hooks {
+                        for matcher in matchers {
+                            for hook_def in &matcher.hooks {
+                                let cmd = hook_def.command.as_deref()
+                                    .or(hook_def.prompt.as_deref())
+                                    .unwrap_or("(no command)");
+                                hooks_list.push((
+                                    event_name.clone(),
+                                    format!("{}: {}", plugin.manifest.name, cmd),
+                                    true,
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        if hooks_list.is_empty() {
+            CommandOutput::new(OutputFormat::Text {
+                content: "No hooks configured.\n\nAdd hooks in .owlen/hooks/ or plugin hooks.json files.".to_string(),
+            })
+        } else {
+            CommandOutput::hooks_list(&hooks_list)
+        }
+    }
+
+    /// Generate plugins output
+    fn plugins(&self) -> CommandOutput {
+        if let Some(pm) = self.plugin_manager {
+            let plugins = pm.plugins();
+            if plugins.is_empty() {
+                return CommandOutput::new(OutputFormat::Text {
+                    content: "No plugins loaded.\n\nPlace plugins in:\n  - ~/.config/owlen/plugins (user)\n  - .owlen/plugins (project)".to_string(),
+                });
+            }
+
+            // Build tree of plugins and their components
+            let children: Vec<TreeNode> = plugins.iter().map(|p| {
+                let mut plugin_children = vec![];
+
+                let commands = p.all_command_names();
+                if !commands.is_empty() {
+                    plugin_children.push(TreeNode::new("Commands").with_children(
+                        commands.iter().map(|c| TreeNode::new(format!("/{}", c))).collect()
+                    ));
+                }
+
+                let agents = p.all_agent_names();
+                if !agents.is_empty() {
+                    plugin_children.push(TreeNode::new("Agents").with_children(
+                        agents.iter().map(|a| TreeNode::new(a)).collect()
+                    ));
+                }
+
+                let skills = p.all_skill_names();
+                if !skills.is_empty() {
+                    plugin_children.push(TreeNode::new("Skills").with_children(
+                        skills.iter().map(|s| TreeNode::new(s)).collect()
+                    ));
+                }
+
+                TreeNode::new(format!("{} v{}", p.manifest.name, p.manifest.version))
+                    .with_children(plugin_children)
+            }).collect();
+
+            CommandOutput::new(OutputFormat::Tree {
+                root: TreeNode::new("Loaded Plugins").with_children(children),
+            })
+        } else {
+            CommandOutput::new(OutputFormat::Text {
+                content: "Plugin manager not available.".to_string(),
+            })
+        }
+    }
+
+    /// Generate status output
+    fn status(&self) -> CommandOutput {
+        let mut items = vec![];
+
+        if let Some(stats) = self.stats {
+            items.push(ListItem {
+                text: format!("Messages: {}", stats.total_messages),
+                marker: Some("📊".to_string()),
+                style: None,
+            });
+            items.push(ListItem {
+                text: format!("Tool Calls: {}", stats.total_tool_calls),
+                marker: Some("🔧".to_string()),
+                style: None,
+            });
+            items.push(ListItem {
+                text: format!("Est. Tokens: ~{}", stats.estimated_tokens),
+                marker: Some("📝".to_string()),
+                style: None,
+            });
+            let uptime = stats.start_time.elapsed().unwrap_or_default();
+            items.push(ListItem {
+                text: format!("Uptime: {}", SessionStats::format_duration(uptime)),
+                marker: Some("⏱️".to_string()),
+                style: None,
+            });
+        }
+
+        if let Some(perms) = self.permission_manager {
+            items.push(ListItem {
+                text: format!("Mode: {:?}", perms.mode()),
+                marker: Some("🔒".to_string()),
+                style: None,
+            });
+        }
+
+        if items.is_empty() {
+            CommandOutput::new(OutputFormat::Text {
+                content: "Session status not available.".to_string(),
+            })
+        } else {
+            CommandOutput::new(OutputFormat::List { items })
+        }
+    }
+
+    /// Generate permissions output
+    fn permissions(&self) -> CommandOutput {
+        if let Some(perms) = self.permission_manager {
+            let mode = perms.mode();
+            let mode_str = format!("{:?}", mode);
+
+            let mut items = vec![
+                ListItem {
+                    text: format!("Current Mode: {}", mode_str),
+                    marker: Some("🔒".to_string()),
+                    style: None,
+                },
+            ];
+
+            // Add tool permissions summary
+            let (read_status, write_status, bash_status) = match mode {
+                permissions::Mode::Plan => ("✅ Allowed", "❓ Ask", "❓ Ask"),
+                permissions::Mode::AcceptEdits => ("✅ Allowed", "✅ Allowed", "❓ Ask"),
+                permissions::Mode::Code => ("✅ Allowed", "✅ Allowed", "✅ Allowed"),
+            };
+
+            items.push(ListItem {
+                text: format!("Read/Grep/Glob: {}", read_status),
+                marker: None,
+                style: None,
+            });
+            items.push(ListItem {
+                text: format!("Write/Edit: {}", write_status),
+                marker: None,
+                style: None,
+            });
+            items.push(ListItem {
+                text: format!("Bash: {}", bash_status),
+                marker: None,
+                style: None,
+            });
+
+            CommandOutput::new(OutputFormat::List { items })
+        } else {
+            CommandOutput::new(OutputFormat::Text {
+                content: "Permission manager not available.".to_string(),
+            })
+        }
+    }
+}
+
+impl Default for BuiltinCommands<'_> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_help_command() {
+        let handler = BuiltinCommands::new();
+        match handler.execute("/help") {
+            CommandResult::Output(output) => {
+                match output.format {
+                    OutputFormat::Table { headers, rows } => {
+                        assert!(!headers.is_empty());
+                        assert!(!rows.is_empty());
+                    }
+                    _ => panic!("Expected Table format"),
+                }
+            }
+            _ => panic!("Expected Output result"),
+        }
+    }
+
+    #[test]
+    fn test_exit_command() {
+        let handler = BuiltinCommands::new();
+        assert!(matches!(handler.execute("/exit"), CommandResult::Exit));
+        assert!(matches!(handler.execute("/quit"), CommandResult::Exit));
+        assert!(matches!(handler.execute("/q"), CommandResult::Exit));
+    }
+
+    #[test]
+    fn test_clear_command() {
+        let handler = BuiltinCommands::new();
+        assert!(matches!(handler.execute("/clear"), CommandResult::Handled));
+    }
+
+    #[test]
+    fn test_unknown_command() {
+        let handler = BuiltinCommands::new();
+        assert!(matches!(handler.execute("/unknown"), CommandResult::NotFound));
+    }
+}

crates/app/cli/src/engine.rs

@@ -0,0 +1,329 @@
+use agent_core::messages::{Message, UserAction, AgentResponse, SystemNotification};
+use agent_core::state::AppState;
+use tokio::sync::{mpsc, Mutex};
+use std::sync::Arc;
+use std::path::PathBuf;
+use llm_core::LlmProvider;
+use ui::ProviderManager;
+use tools_plan::PlanManager;
+use crate::agent_manager::AgentManager;
+
+/// The main background task that handles logic, API calls, and state updates.
+/// Uses a shared ProviderManager for dynamic provider/model switching.
+pub async fn run_engine_loop_dynamic(
+    mut rx: mpsc::Receiver<Message>,
+    tx_ui: mpsc::Sender<Message>,
+    provider_manager: Arc<Mutex<ProviderManager>>,
+    state: Arc<Mutex<AppState>>,
+) {
+    let agent_manager = Arc::new(
+        AgentManager::with_provider_manager(provider_manager, state.clone())
+            .with_ui_sender(tx_ui.clone())
+    );
+
+    // Plan manager for persistence
+    let plan_manager = PlanManager::new(PathBuf::from("."));
+
+    while let Some(msg) = rx.recv().await {
+        match msg {
+            Message::UserAction(UserAction::Input(text)) => {
+                let agent_manager_clone = agent_manager.clone();
+                let tx_clone = tx_ui.clone();
+
+                tokio::spawn(async move {
+                    if let Err(e) = agent_manager_clone.run(&text).await {
+                        let _ = tx_clone.send(Message::AgentResponse(AgentResponse::Error(e.to_string()))).await;
+                    }
+                });
+            }
+            Message::UserAction(UserAction::PermissionResult(res)) => {
+                let mut guard = state.lock().await;
+                guard.set_permission_result(res);
+            }
+            Message::UserAction(UserAction::FinalizePlan) => {
+                let mut guard = state.lock().await;
+                if let Some(plan) = guard.current_plan_mut() {
+                    plan.finalize();
+                    let total_steps = plan.steps.len();
+                    let status = plan.status.clone();
+                    drop(guard);
+                    let _ = tx_ui.send(Message::AgentResponse(AgentResponse::PlanComplete {
+                        total_steps,
+                        status,
+                    })).await;
+                }
+            }
+            Message::UserAction(UserAction::PlanApproval(approval)) => {
+                let mut guard = state.lock().await;
+                if let Some(plan) = guard.current_plan_mut() {
+                    // Apply approval decisions
+                    approval.apply_to(plan);
+                    plan.start_execution();
+
+                    // Get approved steps for execution
+                    let approved_steps: Vec<_> = plan.steps.iter()
+                        .filter(|s| s.is_approved())
+                        .cloned()
+                        .collect();
+                    let total = approved_steps.len();
+                    let skipped = plan.steps.iter().filter(|s| s.is_rejected()).count();
+
+                    drop(guard);
+
+                    // Execute approved steps
+                    for (idx, step) in approved_steps.iter().enumerate() {
+                        let _ = tx_ui.send(Message::AgentResponse(AgentResponse::PlanExecuting {
+                            step_id: step.id.clone(),
+                            step_index: idx,
+                            total_steps: total,
+                        })).await;
+
+                        // Execute the tool
+                        let agent_manager_clone = agent_manager.clone();
+                        let tx_clone = tx_ui.clone();
+                        let step_clone = step.clone();
+
+                        // Execute tool and send result
+                        if let Err(e) = agent_manager_clone.execute_single_tool(&step_clone.tool, &step_clone.args).await {
+                            let _ = tx_clone.send(Message::AgentResponse(AgentResponse::Error(
+                                format!("Step {} failed: {}", idx + 1, e)
+                            ))).await;
+                        }
+                    }
+
+                    // Mark plan as completed
+                    let mut guard = state.lock().await;
+                    if let Some(plan) = guard.current_plan_mut() {
+                        plan.complete();
+                    }
+                    drop(guard);
+
+                    let _ = tx_ui.send(Message::AgentResponse(AgentResponse::PlanExecutionComplete {
+                        executed: total,
+                        skipped,
+                    })).await;
+                }
+            }
+            Message::UserAction(UserAction::SavePlan(name)) => {
+                let guard = state.lock().await;
+                if let Some(plan) = guard.current_plan() {
+                    let mut plan_to_save = plan.clone();
+                    plan_to_save.name = Some(name.clone());
+                    drop(guard);
+
+                    match plan_manager.save_accumulated_plan(&plan_to_save).await {
+                        Ok(path) => {
+                            let _ = tx_ui.send(Message::System(SystemNotification::PlanSaved {
+                                id: plan_to_save.id.clone(),
+                                path: path.display().to_string(),
+                            })).await;
+                        }
+                        Err(e) => {
+                            let _ = tx_ui.send(Message::AgentResponse(AgentResponse::Error(
+                                format!("Failed to save plan: {}", e)
+                            ))).await;
+                        }
+                    }
+                }
+            }
+            Message::UserAction(UserAction::LoadPlan(id)) => {
+                match plan_manager.load_accumulated_plan(&id).await {
+                    Ok(plan) => {
+                        let name = plan.name.clone();
+                        let steps = plan.steps.len();
+                        let mut guard = state.lock().await;
+                        guard.accumulated_plan = Some(plan);
+                        drop(guard);
+
+                        let _ = tx_ui.send(Message::System(SystemNotification::PlanLoaded {
+                            id,
+                            name,
+                            steps,
+                        })).await;
+                    }
+                    Err(e) => {
+                        let _ = tx_ui.send(Message::AgentResponse(AgentResponse::Error(
+                            format!("Failed to load plan: {}", e)
+                        ))).await;
+                    }
+                }
+            }
+            Message::UserAction(UserAction::CancelPlan) => {
+                let mut guard = state.lock().await;
+                if let Some(plan) = guard.current_plan_mut() {
+                    plan.cancel();
+                }
+                guard.clear_plan();
+            }
+            Message::UserAction(UserAction::Exit) => {
+                let mut guard = state.lock().await;
+                guard.running = false;
+                break;
+            }
+            _ => {}
+        }
+    }
+}
+
+/// Legacy engine loop with fixed client (for backward compatibility)
+pub async fn run_engine_loop(
+    mut rx: mpsc::Receiver<Message>,
+    tx_ui: mpsc::Sender<Message>,
+    client: Arc<dyn LlmProvider>,
+    state: Arc<Mutex<AppState>>,
+) {
+    let agent_manager = Arc::new(AgentManager::new(client, state.clone()).with_ui_sender(tx_ui.clone()));
+
+    while let Some(msg) = rx.recv().await {
+        match msg {
+            Message::UserAction(UserAction::Input(text)) => {
+                let agent_manager_clone = agent_manager.clone();
+                let tx_clone = tx_ui.clone();
+
+                tokio::spawn(async move {
+                    if let Err(e) = agent_manager_clone.run(&text).await {
+                        let _ = tx_clone.send(Message::AgentResponse(AgentResponse::Error(e.to_string()))).await;
+                    }
+                });
+            }
+            Message::UserAction(UserAction::PermissionResult(res)) => {
+                let mut guard = state.lock().await;
+                guard.set_permission_result(res);
+            }
+            Message::UserAction(UserAction::Exit) => {
+                let mut guard = state.lock().await;
+                guard.running = false;
+                break;
+            }
+            _ => {}
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use llm_core::{LlmError, Tool, ChunkStream, StreamChunk, ChatMessage, ChatOptions};
+    use async_trait::async_trait;
+    use futures::stream;
+
+    struct MockProvider;
+
+    #[async_trait]
+    impl LlmProvider for MockProvider {
+        fn name(&self) -> &str { "mock" }
+        fn model(&self) -> &str { "mock-model" }
+
+        async fn chat_stream(
+            &self,
+            _messages: &[ChatMessage],
+            _options: &ChatOptions,
+            _tools: Option<&[Tool]>,
+        ) -> Result<ChunkStream, LlmError> {
+            let chunks = vec![
+                Ok(StreamChunk { content: Some("Hello".to_string()), tool_calls: None, done: false, usage: None }),
+                Ok(StreamChunk { content: Some(" World".to_string()), tool_calls: None, done: true, usage: None }),
+            ];
+            Ok(Box::pin(stream::iter(chunks)))
+        }
+    }
+
+    #[tokio::test]
+    async fn test_engine_streaming() {
+        let (tx_in, rx_in) = mpsc::channel(1);
+        let (tx_out, mut rx_out) = mpsc::channel(10);
+        
+        let client = Arc::new(MockProvider);
+        let state = Arc::new(Mutex::new(AppState::new()));
+
+        // Spawn the engine loop
+        tokio::spawn(async move {
+            run_engine_loop(rx_in, tx_out, client, state).await;
+        });
+
+        // Send a message
+        tx_in.send(Message::UserAction(UserAction::Input("Hi".to_string()))).await.unwrap();
+
+        // Verify streaming responses
+        let mut tokens = Vec::new();
+        while let Some(msg) = rx_out.recv().await {
+            match msg {
+                Message::AgentResponse(AgentResponse::Token(s)) => tokens.push(s),
+                Message::AgentResponse(AgentResponse::Complete) => break,
+                _ => {}
+            }
+        }
+        assert_eq!(tokens, vec!["Hello", " World"]);
+    }
+
+    #[tokio::test]
+    async fn test_engine_permission_result() {
+        let (tx_in, rx_in) = mpsc::channel(1);
+        let (tx_out, _rx_out) = mpsc::channel(10);
+
+        let client = Arc::new(MockProvider);
+        let state = Arc::new(Mutex::new(AppState::new()));
+        let state_clone = state.clone();
+
+        // Spawn the engine loop
+        tokio::spawn(async move {
+            run_engine_loop(rx_in, tx_out, client, state_clone).await;
+        });
+
+        // Send a PermissionResult
+        tx_in.send(Message::UserAction(UserAction::PermissionResult(true))).await.unwrap();
+
+        // Give it a moment to process
+        tokio::time::sleep(tokio::time::Duration::from_millis(50)).await;
+
+        let guard = state.lock().await;
+        assert_eq!(guard.last_permission_result, Some(true));
+    }
+
+    #[tokio::test]
+    async fn test_engine_plan_mode() {
+        use agent_core::state::AppMode;
+
+        let (tx_in, rx_in) = mpsc::channel(1);
+        let (tx_out, mut rx_out) = mpsc::channel(10);
+
+        let client = Arc::new(MockProvider);
+        let state = Arc::new(Mutex::new(AppState::new()));
+
+        // Set Plan mode
+        {
+            let mut guard = state.lock().await;
+            guard.mode = AppMode::Plan;
+        }
+
+        let state_clone = state.clone();
+
+        // Spawn the engine loop
+        tokio::spawn(async move {
+            run_engine_loop(rx_in, tx_out, client, state_clone).await;
+        });
+
+        // Send a message
+        tx_in.send(Message::UserAction(UserAction::Input("Hi".to_string()))).await.unwrap();
+
+        // Verify we get responses (tokens and complete)
+        let mut received_tokens = false;
+        let mut received_complete = false;
+        let timeout = tokio::time::timeout(tokio::time::Duration::from_secs(2), async {
+            while let Some(msg) = rx_out.recv().await {
+                match msg {
+                    Message::AgentResponse(AgentResponse::Token(_)) => received_tokens = true,
+                    Message::AgentResponse(AgentResponse::Complete) => {
+                        received_complete = true;
+                        break;
+                    }
+                    _ => {}
+                }
+            }
+        }).await;
+
+        assert!(timeout.is_ok(), "Should receive responses within timeout");
+        assert!(received_tokens, "Should receive tokens");
+        assert!(received_complete, "Should receive complete signal");
+    }
+}

crates/app/cli/src/tool_registry.rs

@@ -0,0 +1,56 @@
+use std::collections::HashMap;
+use serde_json::Value;
+use llm_core::Tool;
+
+/// Registry for tools available to the agent
+pub struct ToolRegistry {
+    tools: HashMap<String, Tool>,
+}
+
+impl ToolRegistry {
+    pub fn new() -> Self {
+        Self {
+            tools: HashMap::new(),
+        }
+    }
+
+    /// Register a tool
+    pub fn register(&mut self, tool: Tool) {
+        self.tools.insert(tool.function.name.clone(), tool);
+    }
+
+    /// Get a tool by name
+    pub fn get(&self, name: &str) -> Option<&Tool> {
+        self.tools.get(name)
+    }
+
+    /// Get all registered tools as a list (for LLM context)
+    pub fn list_tools(&self) -> Vec<Tool> {
+        self.tools.values().cloned().collect()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use llm_core::{ToolParameters, ToolFunction};
+
+    fn create_mock_tool(name: &str) -> Tool {
+        Tool::function(
+            name,
+            "Description",
+            ToolParameters::object(serde_json::json!({}), vec![])
+        )
+    }
+
+    #[test]
+    fn test_registry() {
+        let mut registry = ToolRegistry::new();
+        let tool = create_mock_tool("test_tool");
+        
+        registry.register(tool.clone());
+        
+        assert!(registry.get("test_tool").is_some());
+        assert_eq!(registry.list_tools().len(), 1);
+    }
+}

crates/app/cli/tests/chat_stream.rs

@@ -0,0 +1,34 @@
+use assert_cmd::Command;
+use httpmock::prelude::*;
+use predicates::prelude::PredicateBooleanExt;
+
+#[tokio::test]
+async fn headless_streams_ndjson() {
+    let server = MockServer::start_async().await;
+
+    let response = concat!(
+        r#"{"message":{"role":"assistant","content":"Hel"}}"#,"\n",
+        r#"{"message":{"role":"assistant","content":"lo"}}"#,"\n",
+        r#"{"done":true}"#,"\n",
+    );
+
+    // The CLI includes tools in the request, so we need to match any request to /api/chat
+    // instead of matching exact body (which includes tool definitions)
+    let _m = server.mock(|when, then| {
+        when.method(POST)
+            .path("/api/chat");
+        then.status(200)
+            .header("content-type", "application/x-ndjson")
+            .body(response);
+    });
+
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--ollama-url").arg(server.base_url())
+        .arg("--model").arg("qwen2.5")
+        .arg("--print")
+        .arg("hello");
+
+    cmd.assert()
+        .success()
+        .stdout(predicates::str::contains("Hello").count(1).or(predicates::str::contains("Hel").and(predicates::str::contains("lo"))));
+}

crates/app/cli/tests/headless.rs

@@ -0,0 +1,145 @@
+use assert_cmd::Command;
+use serde_json::Value;
+use std::fs;
+use tempfile::tempdir;
+
+#[test]
+fn print_json_has_session_id_and_stats() {
+    let mut cmd = Command::cargo_bin("owlen").unwrap();
+    cmd.arg("--output-format")
+        .arg("json")
+        .arg("Say hello");
+
+    let output = cmd.assert().success();
+    let stdout = String::from_utf8_lossy(&output.get_output().stdout);
+
+    // Parse JSON output
+    let json: Value = serde_json::from_str(&stdout).expect("Output should be valid JSON");
+
+    // Verify session_id exists
+    assert!(json.get("session_id").is_some(), "JSON output should have session_id");
+    let session_id = json["session_id"].as_str().unwrap();
+    assert!(!session_id.is_empty(), "session_id should not be empty");
+
+    // Verify stats exist
+    assert!(json.get("stats").is_some(), "JSON output should have stats");
+    let stats = &json["stats"];
+
+    // Check for token counts
+    assert!(stats.get("total_tokens").is_some(), "stats should have total_tokens");
+
+    // Check for messages
+    assert!(json.get("messages").is_some(), "JSON output should have messages");
+}
+
+#[test]
+fn stream_json_sequence_is_well_formed() {
+    let mut cmd = Command::cargo_bin("owlen").unwrap();
+    cmd.arg("--output-format")
+        .arg("stream-json")
+        .arg("Say hello");
+
+    let output = cmd.assert().success();
+    let stdout = String::from_utf8_lossy(&output.get_output().stdout);
+
+    // Stream-JSON is NDJSON - each line should be valid JSON
+    let lines: Vec<&str> = stdout.lines().filter(|l| !l.is_empty()).collect();
+
+    assert!(!lines.is_empty(), "Stream-JSON should produce at least one event");
+
+    // Each line should be valid JSON
+    for (i, line) in lines.iter().enumerate() {
+        let json: Value = serde_json::from_str(line)
+            .expect(&format!("Line {} should be valid JSON: {}", i, line));
+
+        // Each event should have a type
+        assert!(json.get("type").is_some(), "Event should have a type field");
+    }
+
+    // First event should be session_start
+    let first: Value = serde_json::from_str(lines[0]).unwrap();
+    assert_eq!(first["type"].as_str().unwrap(), "session_start");
+    assert!(first.get("session_id").is_some());
+
+    // Last event should be session_end or complete
+    let last: Value = serde_json::from_str(lines[lines.len() - 1]).unwrap();
+    let last_type = last["type"].as_str().unwrap();
+    assert!(
+        last_type == "session_end" || last_type == "complete",
+        "Last event should be session_end or complete, got: {}",
+        last_type
+    );
+}
+
+#[test]
+fn text_format_is_default() {
+    let mut cmd = Command::cargo_bin("owlen").unwrap();
+    cmd.arg("Say hello");
+
+    let output = cmd.assert().success();
+    let stdout = String::from_utf8_lossy(&output.get_output().stdout);
+
+    // Text format should not be JSON
+    assert!(serde_json::from_str::<Value>(&stdout).is_err(),
+           "Default output should be text, not JSON");
+}
+
+#[test]
+fn json_format_with_tool_execution() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("test.txt");
+    fs::write(&file, "hello world").unwrap();
+
+    let mut cmd = Command::cargo_bin("owlen").unwrap();
+    cmd.arg("--mode")
+        .arg("code")
+        .arg("--output-format")
+        .arg("json")
+        .arg("read")
+        .arg(file.to_str().unwrap());
+
+    let output = cmd.assert().success();
+    let stdout = String::from_utf8_lossy(&output.get_output().stdout);
+
+    let json: Value = serde_json::from_str(&stdout).expect("Output should be valid JSON");
+
+    // Should have result
+    assert!(json.get("result").is_some());
+
+    // Should have tool info
+    assert!(json.get("tool").is_some());
+    assert_eq!(json["tool"].as_str().unwrap(), "Read");
+}
+
+#[test]
+fn stream_json_includes_chunk_events() {
+    let mut cmd = Command::cargo_bin("owlen").unwrap();
+    cmd.arg("--output-format")
+        .arg("stream-json")
+        .arg("Say hello");
+
+    let output = cmd.assert().success();
+    let stdout = String::from_utf8_lossy(&output.get_output().stdout);
+
+    let lines: Vec<&str> = stdout.lines().filter(|l| !l.is_empty()).collect();
+
+    // Should have chunk events between session_start and session_end
+    let chunk_events: Vec<&str> = lines.iter()
+        .filter(|line| {
+            if let Ok(json) = serde_json::from_str::<Value>(line) {
+                json["type"].as_str() == Some("chunk")
+            } else {
+                false
+            }
+        })
+        .copied()
+        .collect();
+
+    assert!(!chunk_events.is_empty(), "Should have at least one chunk event");
+
+    // Each chunk should have content
+    for chunk_line in chunk_events {
+        let chunk: Value = serde_json::from_str(chunk_line).unwrap();
+        assert!(chunk.get("content").is_some(), "Chunk should have content");
+    }
+}

crates/app/cli/tests/permissions.rs

@@ -0,0 +1,255 @@
+use assert_cmd::Command;
+use std::fs;
+use tempfile::tempdir;
+
+#[test]
+fn plan_mode_allows_read_operations() {
+    // Create a temp file to read
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("test.txt");
+    fs::write(&file, "hello world").unwrap();
+
+    // Read operation should work in plan mode (default)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("read").arg(file.to_str().unwrap());
+    cmd.assert().success().stdout("hello world\n");
+}
+
+#[test]
+fn plan_mode_allows_glob_operations() {
+    let dir = tempdir().unwrap();
+    fs::write(dir.path().join("a.txt"), "test").unwrap();
+    fs::write(dir.path().join("b.txt"), "test").unwrap();
+
+    let pattern = format!("{}/*.txt", dir.path().display());
+
+    // Glob operation should work in plan mode (default)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("glob").arg(&pattern);
+    cmd.assert().success();
+}
+
+#[test]
+fn plan_mode_allows_grep_operations() {
+    let dir = tempdir().unwrap();
+    fs::write(dir.path().join("test.txt"), "hello world\nfoo bar").unwrap();
+
+    // Grep operation should work in plan mode (default)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("grep").arg(dir.path().to_str().unwrap()).arg("hello");
+    cmd.assert().success();
+}
+
+#[test]
+fn mode_override_via_cli_flag() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("test.txt");
+    fs::write(&file, "content").unwrap();
+
+    // Test with --mode code (should also allow read)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode")
+        .arg("code")
+        .arg("read")
+        .arg(file.to_str().unwrap());
+    cmd.assert().success().stdout("content\n");
+}
+
+#[test]
+fn plan_mode_blocks_write_operations() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("new.txt");
+
+    // Write operation should be blocked in plan mode (default)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("write").arg(file.to_str().unwrap()).arg("content");
+    cmd.assert().failure();
+}
+
+#[test]
+fn plan_mode_blocks_edit_operations() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("test.txt");
+    fs::write(&file, "old content").unwrap();
+
+    // Edit operation should be blocked in plan mode (default)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("edit")
+        .arg(file.to_str().unwrap())
+        .arg("old")
+        .arg("new");
+    cmd.assert().failure();
+}
+
+#[test]
+fn accept_edits_mode_allows_write() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("new.txt");
+
+    // Write operation should work in acceptEdits mode
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode")
+        .arg("acceptEdits")
+        .arg("write")
+        .arg(file.to_str().unwrap())
+        .arg("new content");
+    cmd.assert().success();
+
+    // Verify file was written
+    assert_eq!(fs::read_to_string(&file).unwrap(), "new content");
+}
+
+#[test]
+fn accept_edits_mode_allows_edit() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("test.txt");
+    fs::write(&file, "line 1\nline 2\nline 3").unwrap();
+
+    // Edit operation should work in acceptEdits mode
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode")
+        .arg("acceptEdits")
+        .arg("edit")
+        .arg(file.to_str().unwrap())
+        .arg("line 2")
+        .arg("modified line");
+    cmd.assert().success();
+
+    // Verify file was edited
+    assert_eq!(
+        fs::read_to_string(&file).unwrap(),
+        "line 1\nmodified line\nline 3"
+    );
+}
+
+#[test]
+fn code_mode_allows_all_operations() {
+    let dir = tempdir().unwrap();
+    let file = dir.path().join("test.txt");
+
+    // Write in code mode
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode")
+        .arg("code")
+        .arg("write")
+        .arg(file.to_str().unwrap())
+        .arg("initial content");
+    cmd.assert().success();
+
+    // Edit in code mode
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode")
+        .arg("code")
+        .arg("edit")
+        .arg(file.to_str().unwrap())
+        .arg("initial")
+        .arg("modified");
+    cmd.assert().success();
+
+    assert_eq!(fs::read_to_string(&file).unwrap(), "modified content");
+}
+
+#[test]
+fn plan_mode_blocks_bash_operations() {
+    // Bash operation should be blocked in plan mode (default)
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("bash").arg("echo hello");
+    cmd.assert().failure();
+}
+
+#[test]
+fn code_mode_allows_bash() {
+    // Bash operation should work in code mode
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode").arg("code").arg("bash").arg("echo hello");
+    cmd.assert().success().stdout("hello\n");
+}
+
+#[test]
+fn bash_command_timeout_works() {
+    // Test that timeout works
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.arg("--mode")
+        .arg("code")
+        .arg("bash")
+        .arg("sleep 10")
+        .arg("--timeout")
+        .arg("1000");
+    cmd.assert().failure();
+}
+
+#[test]
+fn slash_command_works() {
+    // Create .owlen/commands directory in temp dir
+    let dir = tempdir().unwrap();
+    let commands_dir = dir.path().join(".owlen/commands");
+    fs::create_dir_all(&commands_dir).unwrap();
+
+    // Create a test slash command
+    let command_content = r#"---
+description: "Test command"
+---
+Hello from slash command!
+Args: $ARGUMENTS
+First: $1
+"#;
+    let command_file = commands_dir.join("test.md");
+    fs::write(&command_file, command_content).unwrap();
+
+    // Execute slash command with args from the temp directory
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.current_dir(dir.path())
+        .arg("--mode")
+        .arg("code")
+        .arg("slash")
+        .arg("test")
+        .arg("arg1");
+
+    cmd.assert()
+        .success()
+        .stdout(predicates::str::contains("Hello from slash command!"))
+        .stdout(predicates::str::contains("Args: arg1"))
+        .stdout(predicates::str::contains("First: arg1"));
+}
+
+#[test]
+fn slash_command_file_refs() {
+    let dir = tempdir().unwrap();
+    let commands_dir = dir.path().join(".owlen/commands");
+    fs::create_dir_all(&commands_dir).unwrap();
+
+    // Create a file to reference
+    let data_file = dir.path().join("data.txt");
+    fs::write(&data_file, "Referenced content").unwrap();
+
+    // Create slash command with file reference
+    let command_content = format!("File content: @{}", data_file.display());
+    fs::write(commands_dir.join("reftest.md"), command_content).unwrap();
+
+    // Execute slash command
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.current_dir(dir.path())
+        .arg("--mode")
+        .arg("code")
+        .arg("slash")
+        .arg("reftest");
+
+    cmd.assert()
+        .success()
+        .stdout(predicates::str::contains("Referenced content"));
+}
+
+#[test]
+fn slash_command_not_found() {
+    let dir = tempdir().unwrap();
+
+    // Try to execute non-existent slash command
+    let mut cmd = Command::new(assert_cmd::cargo::cargo_bin!("owlen"));
+    cmd.current_dir(dir.path())
+        .arg("--mode")
+        .arg("code")
+        .arg("slash")
+        .arg("nonexistent");
+
+    cmd.assert().failure();
+}

crates/app/ui/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "ui"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+color-eyre = "0.6"
+crossterm = { version = "0.28", features = ["event-stream"] }
+ratatui = "0.28"
+tokio = { version = "1", features = ["full"] }
+futures = "0.3"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+unicode-width = "0.2"
+textwrap = "0.16"
+syntect = { version = "5.0", default-features = false, features = ["default-syntaxes", "default-themes", "regex-onig"] }
+pulldown-cmark = "0.11"
+
+# Internal dependencies
+agent-core = { path = "../../core/agent" }
+auth-manager = { path = "../../platform/auth" }
+permissions = { path = "../../platform/permissions" }
+llm-core = { path = "../../llm/core" }
+llm-anthropic = { path = "../../llm/anthropic" }
+llm-ollama = { path = "../../llm/ollama" }
+llm-openai = { path = "../../llm/openai" }
+config-agent = { path = "../../platform/config" }
+tools-todo = { path = "../../tools/todo" }
+tools-plan = { path = "../../tools/plan" }

crates/app/ui/README.md

@@ -0,0 +1,18 @@
+# Owlen UI
+
+A Terminal User Interface (TUI) for the Owlen AI agent, built with Ratatui.
+
+## Features
+- **Rich Text Rendering:** Markdown support with syntax highlighting for code blocks.
+- **Interactive Components:** Intuitive panels for chat, tool execution, and session status.
+- **Real-time Streaming:** Smooth display of agent output as it's generated.
+- **Task Visualization:** Dedicated view for tracking the agent's progress through a task list.
+
+## Architecture
+The UI is built using an event-driven architecture integrated with the `agent-core` event stream. It leverages `ratatui` for terminal rendering and `crossterm` for event handling.
+
+## Components
+- `ChatPanel`: Displays the conversation history.
+- `TaskPanel`: Shows the current implementation plan and task status.
+- `ToolPanel`: Visualizes active tool executions and their output.
+- `ModelPicker`: Allows selecting between available LLM providers and models.

crates/app/ui/src/completions.rs

@@ -0,0 +1,226 @@
+//! Command completion engine for the TUI
+//!
+//! Provides Tab-completion for slash commands, file paths, and tool names.
+
+use std::path::Path;
+
+/// A single completion suggestion
+#[derive(Debug, Clone)]
+pub struct Completion {
+    /// The text to insert
+    pub text: String,
+    /// Description of what this completion does
+    pub description: String,
+    /// Source of the completion (e.g., "builtin", "plugin:name")
+    pub source: String,
+}
+
+/// Information about a command for completion purposes
+#[derive(Debug, Clone)]
+pub struct CommandInfo {
+    /// Command name (without leading /)
+    pub name: String,
+    /// Command description
+    pub description: String,
+    /// Source of the command
+    pub source: String,
+}
+
+impl CommandInfo {
+    pub fn new(name: &str, description: &str, source: &str) -> Self {
+        Self {
+            name: name.to_string(),
+            description: description.to_string(),
+            source: source.to_string(),
+        }
+    }
+}
+
+/// Completion engine for the TUI
+pub struct CompletionEngine {
+    /// Available commands
+    commands: Vec<CommandInfo>,
+}
+
+impl Default for CompletionEngine {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl CompletionEngine {
+    pub fn new() -> Self {
+        Self {
+            commands: Self::builtin_commands(),
+        }
+    }
+
+    /// Get built-in commands
+    fn builtin_commands() -> Vec<CommandInfo> {
+        vec![
+            CommandInfo::new("help", "Show available commands and help", "builtin"),
+            CommandInfo::new("clear", "Clear the screen", "builtin"),
+            CommandInfo::new("mcp", "List MCP servers and their tools", "builtin"),
+            CommandInfo::new("hooks", "Show loaded hooks", "builtin"),
+            CommandInfo::new("compact", "Compact conversation context", "builtin"),
+            CommandInfo::new("mode", "Switch permission mode (plan/edit/code)", "builtin"),
+            CommandInfo::new("provider", "Switch LLM provider", "builtin"),
+            CommandInfo::new("model", "Switch LLM model", "builtin"),
+            CommandInfo::new("checkpoint", "Create a checkpoint", "builtin"),
+            CommandInfo::new("rewind", "Rewind to a checkpoint", "builtin"),
+        ]
+    }
+
+    /// Add commands from plugins
+    pub fn add_plugin_commands(&mut self, plugin_name: &str, commands: Vec<CommandInfo>) {
+        for mut cmd in commands {
+            cmd.source = format!("plugin:{}", plugin_name);
+            self.commands.push(cmd);
+        }
+    }
+
+    /// Add a single command
+    pub fn add_command(&mut self, command: CommandInfo) {
+        self.commands.push(command);
+    }
+
+    /// Get completions for the given input
+    pub fn complete(&self, input: &str) -> Vec<Completion> {
+        if input.starts_with('/') {
+            self.complete_command(&input[1..])
+        } else if input.starts_with('@') {
+            self.complete_file_path(&input[1..])
+        } else {
+            vec![]
+        }
+    }
+
+    /// Complete a slash command
+    fn complete_command(&self, partial: &str) -> Vec<Completion> {
+        let partial_lower = partial.to_lowercase();
+
+        self.commands
+            .iter()
+            .filter(|cmd| {
+                // Match if name starts with partial, or contains partial (fuzzy)
+                cmd.name.to_lowercase().starts_with(&partial_lower)
+                    || (partial.len() >= 2 && cmd.name.to_lowercase().contains(&partial_lower))
+            })
+            .map(|cmd| Completion {
+                text: format!("/{}", cmd.name),
+                description: cmd.description.clone(),
+                source: cmd.source.clone(),
+            })
+            .collect()
+    }
+
+    /// Complete a file path
+    fn complete_file_path(&self, partial: &str) -> Vec<Completion> {
+        let path = Path::new(partial);
+
+        // Get the directory to search and the prefix to match
+        let (dir, prefix) = if partial.ends_with('/') || partial.is_empty() {
+            (partial, "")
+        } else {
+            let parent = path.parent().map(|p| p.to_str().unwrap_or("")).unwrap_or("");
+            let file_name = path.file_name().and_then(|f| f.to_str()).unwrap_or("");
+            (parent, file_name)
+        };
+
+        // Search directory
+        let search_dir = if dir.is_empty() { "." } else { dir };
+
+        match std::fs::read_dir(search_dir) {
+            Ok(entries) => {
+                entries
+                    .filter_map(|entry| entry.ok())
+                    .filter(|entry| {
+                        let name = entry.file_name();
+                        let name_str = name.to_string_lossy();
+                        // Skip hidden files unless user started typing with .
+                        if !prefix.starts_with('.') && name_str.starts_with('.') {
+                            return false;
+                        }
+                        name_str.to_lowercase().starts_with(&prefix.to_lowercase())
+                    })
+                    .map(|entry| {
+                        let name = entry.file_name();
+                        let name_str = name.to_string_lossy();
+                        let is_dir = entry.file_type().map(|t| t.is_dir()).unwrap_or(false);
+
+                        let full_path = if dir.is_empty() {
+                            name_str.to_string()
+                        } else if dir.ends_with('/') {
+                            format!("{}{}", dir, name_str)
+                        } else {
+                            format!("{}/{}", dir, name_str)
+                        };
+
+                        Completion {
+                            text: format!("@{}{}", full_path, if is_dir { "/" } else { "" }),
+                            description: if is_dir { "Directory".to_string() } else { "File".to_string() },
+                            source: "filesystem".to_string(),
+                        }
+                    })
+                    .collect()
+            }
+            Err(_) => vec![],
+        }
+    }
+
+    /// Get all commands (for /help display)
+    pub fn all_commands(&self) -> &[CommandInfo] {
+        &self.commands
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_command_completion_exact() {
+        let engine = CompletionEngine::new();
+        let completions = engine.complete("/help");
+        assert!(!completions.is_empty());
+        assert!(completions.iter().any(|c| c.text == "/help"));
+    }
+
+    #[test]
+    fn test_command_completion_partial() {
+        let engine = CompletionEngine::new();
+        let completions = engine.complete("/hel");
+        assert!(!completions.is_empty());
+        assert!(completions.iter().any(|c| c.text == "/help"));
+    }
+
+    #[test]
+    fn test_command_completion_fuzzy() {
+        let engine = CompletionEngine::new();
+        // "cle" should match "clear"
+        let completions = engine.complete("/cle");
+        assert!(!completions.is_empty());
+        assert!(completions.iter().any(|c| c.text == "/clear"));
+    }
+
+    #[test]
+    fn test_command_info() {
+        let info = CommandInfo::new("test", "A test command", "builtin");
+        assert_eq!(info.name, "test");
+        assert_eq!(info.description, "A test command");
+        assert_eq!(info.source, "builtin");
+    }
+
+    #[test]
+    fn test_add_plugin_commands() {
+        let mut engine = CompletionEngine::new();
+        let plugin_cmds = vec![
+            CommandInfo::new("custom", "A custom command", ""),
+        ];
+        engine.add_plugin_commands("my-plugin", plugin_cmds);
+
+        let completions = engine.complete("/custom");
+        assert!(!completions.is_empty());
+        assert!(completions.iter().any(|c| c.source == "plugin:my-plugin"));
+    }
+}

crates/app/ui/src/components/autocomplete.rs

@@ -0,0 +1,377 @@
+//! Command autocomplete dropdown component
+//!
+//! Displays inline autocomplete suggestions when user types `/`.
+//! Supports fuzzy filtering as user types.
+
+use crate::theme::Theme;
+use crossterm::event::{KeyCode, KeyEvent};
+use ratatui::{
+    layout::Rect,
+    style::Style,
+    text::{Line, Span},
+    widgets::{Block, Borders, Clear, Paragraph},
+    Frame,
+};
+
+/// An autocomplete option
+#[derive(Debug, Clone)]
+pub struct AutocompleteOption {
+    /// The trigger text (command name without /)
+    pub trigger: String,
+    /// Display text (e.g., "/model [name]")
+    pub display: String,
+    /// Short description
+    pub description: String,
+    /// Has submenu/subcommands
+    pub has_submenu: bool,
+}
+
+impl AutocompleteOption {
+    pub fn new(trigger: &str, description: &str) -> Self {
+        Self {
+            trigger: trigger.to_string(),
+            display: format!("/{}", trigger),
+            description: description.to_string(),
+            has_submenu: false,
+        }
+    }
+
+    pub fn with_args(trigger: &str, args: &str, description: &str) -> Self {
+        Self {
+            trigger: trigger.to_string(),
+            display: format!("/{} {}", trigger, args),
+            description: description.to_string(),
+            has_submenu: false,
+        }
+    }
+
+    pub fn with_submenu(trigger: &str, description: &str) -> Self {
+        Self {
+            trigger: trigger.to_string(),
+            display: format!("/{}", trigger),
+            description: description.to_string(),
+            has_submenu: true,
+        }
+    }
+}
+
+/// Default command options
+fn default_options() -> Vec<AutocompleteOption> {
+    vec![
+        AutocompleteOption::new("help", "Show help"),
+        AutocompleteOption::new("status", "Session info"),
+        AutocompleteOption::with_args("model", "[name]", "Switch model"),
+        AutocompleteOption::with_args("provider", "[name]", "Switch provider"),
+        AutocompleteOption::new("history", "View history"),
+        AutocompleteOption::new("checkpoint", "Save state"),
+        AutocompleteOption::new("checkpoints", "List checkpoints"),
+        AutocompleteOption::with_args("rewind", "[id]", "Restore"),
+        AutocompleteOption::new("cost", "Token usage"),
+        AutocompleteOption::new("clear", "Clear chat"),
+        AutocompleteOption::new("compact", "Compact context"),
+        AutocompleteOption::new("permissions", "Permission mode"),
+        AutocompleteOption::new("themes", "List themes"),
+        AutocompleteOption::with_args("theme", "[name]", "Switch theme"),
+        AutocompleteOption::new("exit", "Exit"),
+    ]
+}
+
+/// Autocomplete dropdown component
+pub struct Autocomplete {
+    options: Vec<AutocompleteOption>,
+    filtered: Vec<usize>,  // indices into options
+    selected: usize,
+    visible: bool,
+    theme: Theme,
+}
+
+impl Autocomplete {
+    pub fn new(theme: Theme) -> Self {
+        let options = default_options();
+        let filtered: Vec<usize> = (0..options.len()).collect();
+
+        Self {
+            options,
+            filtered,
+            selected: 0,
+            visible: false,
+            theme,
+        }
+    }
+
+    /// Show autocomplete and reset filter
+    pub fn show(&mut self) {
+        self.visible = true;
+        self.filtered = (0..self.options.len()).collect();
+        self.selected = 0;
+    }
+
+    /// Hide autocomplete
+    pub fn hide(&mut self) {
+        self.visible = false;
+    }
+
+    /// Check if visible
+    pub fn is_visible(&self) -> bool {
+        self.visible
+    }
+
+    /// Update filter based on current input (text after /)
+    pub fn update_filter(&mut self, query: &str) {
+        if query.is_empty() {
+            self.filtered = (0..self.options.len()).collect();
+        } else {
+            let query_lower = query.to_lowercase();
+            self.filtered = self.options
+                .iter()
+                .enumerate()
+                .filter(|(_, opt)| {
+                    // Fuzzy match: check if query chars appear in order
+                    fuzzy_match(&opt.trigger.to_lowercase(), &query_lower)
+                })
+                .map(|(i, _)| i)
+                .collect();
+        }
+
+        // Reset selection if it's out of bounds
+        if self.selected >= self.filtered.len() {
+            self.selected = 0;
+        }
+    }
+
+    /// Select next option
+    pub fn select_next(&mut self) {
+        if !self.filtered.is_empty() {
+            self.selected = (self.selected + 1) % self.filtered.len();
+        }
+    }
+
+    /// Select previous option
+    pub fn select_prev(&mut self) {
+        if !self.filtered.is_empty() {
+            self.selected = if self.selected == 0 {
+                self.filtered.len() - 1
+            } else {
+                self.selected - 1
+            };
+        }
+    }
+
+    /// Get the currently selected option's trigger
+    pub fn confirm(&self) -> Option<String> {
+        if self.filtered.is_empty() {
+            return None;
+        }
+
+        let idx = self.filtered[self.selected];
+        Some(format!("/{}", self.options[idx].trigger))
+    }
+
+    /// Handle key input, returns Some(command) if confirmed
+    ///
+    /// Key behavior:
+    /// - Tab: Confirm selection and insert into input
+    /// - Down/Up: Navigate options
+    /// - Enter: Pass through to submit (NotHandled)
+    /// - Esc: Cancel autocomplete
+    pub fn handle_key(&mut self, key: KeyEvent) -> AutocompleteResult {
+        if !self.visible {
+            return AutocompleteResult::NotHandled;
+        }
+
+        match key.code {
+            KeyCode::Tab => {
+                // Tab confirms and inserts the selected command
+                if let Some(cmd) = self.confirm() {
+                    self.hide();
+                    AutocompleteResult::Confirmed(cmd)
+                } else {
+                    AutocompleteResult::Handled
+                }
+            }
+            KeyCode::Down => {
+                self.select_next();
+                AutocompleteResult::Handled
+            }
+            KeyCode::BackTab | KeyCode::Up => {
+                self.select_prev();
+                AutocompleteResult::Handled
+            }
+            KeyCode::Enter => {
+                // Enter should submit the message, not confirm autocomplete
+                // Hide autocomplete and let Enter pass through
+                self.hide();
+                AutocompleteResult::NotHandled
+            }
+            KeyCode::Esc => {
+                self.hide();
+                AutocompleteResult::Cancelled
+            }
+            _ => AutocompleteResult::NotHandled,
+        }
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Add custom options (from plugins)
+    pub fn add_options(&mut self, options: Vec<AutocompleteOption>) {
+        self.options.extend(options);
+        // Re-filter with all options
+        self.filtered = (0..self.options.len()).collect();
+    }
+
+    /// Render the autocomplete dropdown above the input line
+    pub fn render(&self, frame: &mut Frame, input_area: Rect) {
+        if !self.visible || self.filtered.is_empty() {
+            return;
+        }
+
+        // Calculate dropdown dimensions
+        let max_visible = 8.min(self.filtered.len());
+        let width = 40.min(input_area.width.saturating_sub(4));
+        let height = (max_visible + 2) as u16; // +2 for borders
+
+        // Position above input, left-aligned with some padding
+        let x = input_area.x + 2;
+        let y = input_area.y.saturating_sub(height);
+
+        let dropdown_area = Rect::new(x, y, width, height);
+
+        // Clear area behind dropdown
+        frame.render_widget(Clear, dropdown_area);
+
+        // Build option lines
+        let mut lines: Vec<Line> = Vec::new();
+
+        for (display_idx, &opt_idx) in self.filtered.iter().take(max_visible).enumerate() {
+            let opt = &self.options[opt_idx];
+            let is_selected = display_idx == self.selected;
+
+            let style = if is_selected {
+                self.theme.selected
+            } else {
+                Style::default()
+            };
+
+            let mut spans = vec![
+                Span::styled(" ", style),
+                Span::styled("/", if is_selected { style } else { self.theme.cmd_slash }),
+                Span::styled(&opt.trigger, if is_selected { style } else { self.theme.cmd_name }),
+            ];
+
+            // Submenu indicator
+            if opt.has_submenu {
+                spans.push(Span::styled(" >", if is_selected { style } else { self.theme.cmd_desc }));
+            }
+
+            // Pad to fixed width for consistent selection highlighting
+            let current_len: usize = spans.iter().map(|s| s.content.len()).sum();
+            let padding = (width as usize).saturating_sub(current_len + 1);
+            spans.push(Span::styled(" ".repeat(padding), style));
+
+            lines.push(Line::from(spans));
+        }
+
+        // Show overflow indicator if needed
+        if self.filtered.len() > max_visible {
+            lines.push(Line::from(Span::styled(
+                format!(" ... +{} more", self.filtered.len() - max_visible),
+                self.theme.cmd_desc,
+            )));
+        }
+
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .border_style(Style::default().fg(self.theme.palette.border))
+            .style(self.theme.overlay_bg);
+
+        let paragraph = Paragraph::new(lines).block(block);
+
+        frame.render_widget(paragraph, dropdown_area);
+    }
+}
+
+/// Result of handling autocomplete key
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum AutocompleteResult {
+    /// Key was not handled by autocomplete
+    NotHandled,
+    /// Key was handled, no action needed
+    Handled,
+    /// User confirmed selection, returns command string
+    Confirmed(String),
+    /// User cancelled autocomplete
+    Cancelled,
+}
+
+/// Simple fuzzy match: check if query chars appear in order in text
+fn fuzzy_match(text: &str, query: &str) -> bool {
+    let mut text_chars = text.chars().peekable();
+
+    for query_char in query.chars() {
+        loop {
+            match text_chars.next() {
+                Some(c) if c == query_char => break,
+                Some(_) => continue,
+                None => return false,
+            }
+        }
+    }
+
+    true
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_fuzzy_match() {
+        assert!(fuzzy_match("help", "h"));
+        assert!(fuzzy_match("help", "he"));
+        assert!(fuzzy_match("help", "hel"));
+        assert!(fuzzy_match("help", "help"));
+        assert!(fuzzy_match("help", "hp")); // fuzzy: h...p
+        assert!(!fuzzy_match("help", "x"));
+        assert!(!fuzzy_match("help", "helping")); // query longer than text
+    }
+
+    #[test]
+    fn test_autocomplete_filter() {
+        let theme = Theme::default();
+        let mut ac = Autocomplete::new(theme);
+
+        ac.update_filter("he");
+        assert!(ac.filtered.len() < ac.options.len());
+
+        // Should match "help"
+        assert!(ac.filtered.iter().any(|&i| ac.options[i].trigger == "help"));
+    }
+
+    #[test]
+    fn test_autocomplete_navigation() {
+        let theme = Theme::default();
+        let mut ac = Autocomplete::new(theme);
+        ac.show();
+
+        assert_eq!(ac.selected, 0);
+        ac.select_next();
+        assert_eq!(ac.selected, 1);
+        ac.select_prev();
+        assert_eq!(ac.selected, 0);
+    }
+
+    #[test]
+    fn test_autocomplete_confirm() {
+        let theme = Theme::default();
+        let mut ac = Autocomplete::new(theme);
+        ac.show();
+
+        let cmd = ac.confirm();
+        assert!(cmd.is_some());
+        assert!(cmd.unwrap().starts_with("/"));
+    }
+}

crates/app/ui/src/components/chat_panel.rs

@@ -0,0 +1,488 @@
+//! Borderless chat panel component
+//!
+//! Displays chat messages with proper indentation, timestamps,
+//! and streaming indicators. Uses whitespace instead of borders.
+
+use crate::theme::Theme;
+use ratatui::{
+    layout::Rect,
+    style::{Modifier, Style},
+    text::{Line, Span, Text},
+    widgets::{Paragraph, Scrollbar, ScrollbarOrientation, ScrollbarState},
+    Frame,
+};
+use std::time::SystemTime;
+
+/// Chat message types
+#[derive(Debug, Clone)]
+pub enum ChatMessage {
+    User(String),
+    Assistant(String),
+    ToolCall { name: String, args: String },
+    ToolResult { success: bool, output: String },
+    System(String),
+}
+
+impl ChatMessage {
+    /// Get a timestamp for when the message was created (for display)
+    pub fn timestamp_display() -> String {
+        let now = SystemTime::now();
+        let secs = now
+            .duration_since(SystemTime::UNIX_EPOCH)
+            .map(|d| d.as_secs())
+            .unwrap_or(0);
+        let hours = (secs / 3600) % 24;
+        let mins = (secs / 60) % 60;
+        format!("{:02}:{:02}", hours, mins)
+    }
+}
+
+/// Message with metadata for display
+#[derive(Debug, Clone)]
+pub struct DisplayMessage {
+    pub message: ChatMessage,
+    pub timestamp: String,
+    pub focused: bool,
+}
+
+impl DisplayMessage {
+    pub fn new(message: ChatMessage) -> Self {
+        Self {
+            message,
+            timestamp: ChatMessage::timestamp_display(),
+            focused: false,
+        }
+    }
+}
+
+/// Borderless chat panel
+pub struct ChatPanel {
+    messages: Vec<DisplayMessage>,
+    scroll_offset: usize,
+    auto_scroll: bool,
+    total_lines: usize,
+    focused_index: Option<usize>,
+    is_streaming: bool,
+    theme: Theme,
+}
+
+impl ChatPanel {
+    /// Create new borderless chat panel
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            messages: Vec::new(),
+            scroll_offset: 0,
+            auto_scroll: true,
+            total_lines: 0,
+            focused_index: None,
+            is_streaming: false,
+            theme,
+        }
+    }
+
+    /// Add a new message
+    pub fn add_message(&mut self, message: ChatMessage) {
+        self.messages.push(DisplayMessage::new(message));
+        self.auto_scroll = true;
+        self.is_streaming = false;
+    }
+
+    /// Append content to the last assistant message, or create a new one
+    pub fn append_to_assistant(&mut self, content: &str) {
+        if let Some(DisplayMessage {
+            message: ChatMessage::Assistant(last_content),
+            ..
+        }) = self.messages.last_mut()
+        {
+            last_content.push_str(content);
+        } else {
+            self.messages.push(DisplayMessage::new(ChatMessage::Assistant(
+                content.to_string(),
+            )));
+        }
+        self.auto_scroll = true;
+        self.is_streaming = true;
+    }
+
+    /// Set streaming state
+    pub fn set_streaming(&mut self, streaming: bool) {
+        self.is_streaming = streaming;
+    }
+
+    /// Scroll up
+    pub fn scroll_up(&mut self, amount: usize) {
+        self.scroll_offset = self.scroll_offset.saturating_sub(amount);
+        self.auto_scroll = false;
+    }
+
+    /// Scroll down
+    pub fn scroll_down(&mut self, amount: usize) {
+        self.scroll_offset = self.scroll_offset.saturating_add(amount);
+        let near_bottom_threshold = 5;
+        if self.total_lines > 0 {
+            let max_scroll = self.total_lines.saturating_sub(1);
+            if self.scroll_offset.saturating_add(near_bottom_threshold) >= max_scroll {
+                self.auto_scroll = true;
+            }
+        }
+    }
+
+    /// Scroll to bottom
+    pub fn scroll_to_bottom(&mut self) {
+        self.scroll_offset = self.total_lines.saturating_sub(1);
+        self.auto_scroll = true;
+    }
+
+    /// Scroll to top
+    pub fn scroll_to_top(&mut self) {
+        self.scroll_offset = 0;
+        self.auto_scroll = false;
+    }
+
+    /// Page up
+    pub fn page_up(&mut self, page_size: usize) {
+        self.scroll_up(page_size.saturating_sub(2));
+    }
+
+    /// Page down
+    pub fn page_down(&mut self, page_size: usize) {
+        self.scroll_down(page_size.saturating_sub(2));
+    }
+
+    /// Focus next message
+    pub fn focus_next(&mut self) {
+        if self.messages.is_empty() {
+            return;
+        }
+        self.focused_index = Some(match self.focused_index {
+            Some(i) if i + 1 < self.messages.len() => i + 1,
+            Some(_) => 0,
+            None => 0,
+        });
+    }
+
+    /// Focus previous message
+    pub fn focus_previous(&mut self) {
+        if self.messages.is_empty() {
+            return;
+        }
+        self.focused_index = Some(match self.focused_index {
+            Some(0) => self.messages.len() - 1,
+            Some(i) => i - 1,
+            None => self.messages.len() - 1,
+        });
+    }
+
+    /// Clear focus
+    pub fn clear_focus(&mut self) {
+        self.focused_index = None;
+    }
+
+    /// Get focused message index
+    pub fn focused_index(&self) -> Option<usize> {
+        self.focused_index
+    }
+
+    /// Get focused message
+    pub fn focused_message(&self) -> Option<&ChatMessage> {
+        self.focused_index
+            .and_then(|i| self.messages.get(i))
+            .map(|m| &m.message)
+    }
+
+    /// Update scroll position before rendering
+    pub fn update_scroll(&mut self, area: Rect) {
+        self.total_lines = self.count_total_lines(area);
+
+        if self.auto_scroll {
+            let visible_height = area.height as usize;
+            let max_scroll = self.total_lines.saturating_sub(visible_height);
+            self.scroll_offset = max_scroll;
+        } else {
+            let visible_height = area.height as usize;
+            let max_scroll = self.total_lines.saturating_sub(visible_height);
+            self.scroll_offset = self.scroll_offset.min(max_scroll);
+        }
+    }
+
+    /// Count total lines for scroll calculation
+    /// Must match exactly what render() produces:
+    /// - User: 1 (role line) + N (content) + 1 (empty) = N + 2
+    /// - Assistant: 1 (role line) + N (content) + 1 (empty) = N + 2
+    /// - ToolCall: 1 (call line) + 1 (empty) = 2
+    /// - ToolResult: 1 (result line) + 1 (empty) = 2
+    /// - System: N (content lines) + 1 (empty) = N + 1
+    fn count_total_lines(&self, area: Rect) -> usize {
+        let mut line_count = 0;
+        let wrap_width = area.width.saturating_sub(4) as usize;
+
+        for msg in &self.messages {
+            line_count += match &msg.message {
+                ChatMessage::User(content) => {
+                    let wrapped = textwrap::wrap(content, wrap_width);
+                    // 1 role line + N content lines + 1 empty line
+                    1 + wrapped.len() + 1
+                }
+                ChatMessage::Assistant(content) => {
+                    let wrapped = textwrap::wrap(content, wrap_width);
+                    // 1 role line + N content lines + 1 empty line
+                    1 + wrapped.len() + 1
+                }
+                ChatMessage::ToolCall { .. } => 2,
+                ChatMessage::ToolResult { .. } => 2,
+                ChatMessage::System(content) => {
+                    // N content lines + 1 empty line (no role line for system)
+                    content.lines().count() + 1
+                }
+            };
+        }
+
+        line_count
+    }
+
+    /// Render the borderless chat panel
+    ///
+    /// Message display format (no symbols, clean typography):
+    /// - Role: bold, appropriate color
+    /// - Timestamp: dim, same line as role
+    /// - Content: 2-space indent, normal weight
+    /// - Blank line between messages
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        let mut text_lines = Vec::new();
+        let wrap_width = area.width.saturating_sub(4) as usize;
+
+        for (idx, display_msg) in self.messages.iter().enumerate() {
+            let is_focused = self.focused_index == Some(idx);
+            let is_last = idx == self.messages.len() - 1;
+
+            match &display_msg.message {
+                ChatMessage::User(content) => {
+                    // Role line: "You" bold + timestamp dim
+                    text_lines.push(Line::from(vec![
+                        Span::styled("  ", Style::default()),
+                        Span::styled("You", self.theme.user_message),
+                        Span::styled(
+                            format!("  {}", display_msg.timestamp),
+                            self.theme.timestamp,
+                        ),
+                    ]));
+
+                    // Message content with 2-space indent
+                    let wrapped = textwrap::wrap(content, wrap_width);
+                    for line in wrapped {
+                        let style = if is_focused {
+                            self.theme.user_message.add_modifier(Modifier::REVERSED)
+                        } else {
+                            self.theme.user_message.remove_modifier(Modifier::BOLD)
+                        };
+                        text_lines.push(Line::from(Span::styled(
+                            format!("  {}", line),
+                            style,
+                        )));
+                    }
+
+                    // Focus hints
+                    if is_focused {
+                        text_lines.push(Line::from(Span::styled(
+                            "  [y]copy [e]edit [r]retry",
+                            self.theme.status_dim,
+                        )));
+                    }
+
+                    text_lines.push(Line::from(""));
+                }
+
+                ChatMessage::Assistant(content) => {
+                    // Role line: streaming indicator (if active) + "Assistant" bold + timestamp
+                    let mut role_spans = vec![Span::styled("  ", Style::default())];
+
+                    // Streaming indicator (subtle, no symbol)
+                    if is_last && self.is_streaming {
+                        role_spans.push(Span::styled(
+                            "... ",
+                            Style::default().fg(self.theme.palette.success),
+                        ));
+                    }
+
+                    role_spans.push(Span::styled(
+                        "Assistant",
+                        self.theme.assistant_message.add_modifier(Modifier::BOLD),
+                    ));
+
+                    role_spans.push(Span::styled(
+                        format!("  {}", display_msg.timestamp),
+                        self.theme.timestamp,
+                    ));
+
+                    text_lines.push(Line::from(role_spans));
+
+                    // Content
+                    let wrapped = textwrap::wrap(content, wrap_width);
+                    for line in wrapped {
+                        let style = if is_focused {
+                            self.theme.assistant_message.add_modifier(Modifier::REVERSED)
+                        } else {
+                            self.theme.assistant_message
+                        };
+                        text_lines.push(Line::from(Span::styled(
+                            format!("  {}", line),
+                            style,
+                        )));
+                    }
+
+                    // Focus hints
+                    if is_focused {
+                        text_lines.push(Line::from(Span::styled(
+                            "  [y]copy [r]retry",
+                            self.theme.status_dim,
+                        )));
+                    }
+
+                    text_lines.push(Line::from(""));
+                }
+
+                ChatMessage::ToolCall { name, args } => {
+                    // Tool calls: name in tool color, args dimmed
+                    text_lines.push(Line::from(vec![
+                        Span::styled("  ", Style::default()),
+                        Span::styled(format!("{} ", name), self.theme.tool_call),
+                        Span::styled(
+                            truncate_str(args, 60),
+                            self.theme.tool_call.add_modifier(Modifier::DIM),
+                        ),
+                    ]));
+                    text_lines.push(Line::from(""));
+                }
+
+                ChatMessage::ToolResult { success, output } => {
+                    // Tool results: status prefix + output
+                    let (prefix, style) = if *success {
+                        ("ok ", self.theme.tool_result_success)
+                    } else {
+                        ("err ", self.theme.tool_result_error)
+                    };
+
+                    text_lines.push(Line::from(vec![
+                        Span::styled("  ", Style::default()),
+                        Span::styled(prefix, style),
+                        Span::styled(
+                            truncate_str(output, 100),
+                            style.remove_modifier(Modifier::BOLD),
+                        ),
+                    ]));
+                    text_lines.push(Line::from(""));
+                }
+
+                ChatMessage::System(content) => {
+                    // System messages: handle multi-line content
+                    for line in content.lines() {
+                        text_lines.push(Line::from(vec![
+                            Span::styled("  ", Style::default()),
+                            Span::styled(line.to_string(), self.theme.system_message),
+                        ]));
+                    }
+                    text_lines.push(Line::from(""));
+                }
+            }
+        }
+
+        let text = Text::from(text_lines);
+        let paragraph = Paragraph::new(text).scroll((self.scroll_offset as u16, 0));
+
+        frame.render_widget(paragraph, area);
+
+        // Render scrollbar if needed
+        if self.total_lines > area.height as usize {
+            let scrollbar = Scrollbar::default()
+                .orientation(ScrollbarOrientation::VerticalRight)
+                .begin_symbol(None)
+                .end_symbol(None)
+                .track_symbol(Some(" "))
+                .thumb_symbol("│")
+                .style(self.theme.status_dim);
+
+            let mut scrollbar_state = ScrollbarState::default()
+                .content_length(self.total_lines)
+                .position(self.scroll_offset);
+
+            frame.render_stateful_widget(scrollbar, area, &mut scrollbar_state);
+        }
+    }
+
+    /// Get messages
+    pub fn messages(&self) -> &[DisplayMessage] {
+        &self.messages
+    }
+
+    /// Clear all messages
+    pub fn clear(&mut self) {
+        self.messages.clear();
+        self.scroll_offset = 0;
+        self.focused_index = None;
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+}
+
+/// Truncate a string to max length with ellipsis
+fn truncate_str(s: &str, max_len: usize) -> String {
+    if s.len() <= max_len {
+        s.to_string()
+    } else {
+        format!("{}...", &s[..max_len.saturating_sub(3)])
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_chat_panel_add_message() {
+        let theme = Theme::default();
+        let mut panel = ChatPanel::new(theme);
+
+        panel.add_message(ChatMessage::User("Hello".to_string()));
+        panel.add_message(ChatMessage::Assistant("Hi there!".to_string()));
+
+        assert_eq!(panel.messages().len(), 2);
+    }
+
+    #[test]
+    fn test_append_to_assistant() {
+        let theme = Theme::default();
+        let mut panel = ChatPanel::new(theme);
+
+        panel.append_to_assistant("Hello");
+        panel.append_to_assistant(" world");
+
+        assert_eq!(panel.messages().len(), 1);
+        if let ChatMessage::Assistant(content) = &panel.messages()[0].message {
+            assert_eq!(content, "Hello world");
+        }
+    }
+
+    #[test]
+    fn test_focus_navigation() {
+        let theme = Theme::default();
+        let mut panel = ChatPanel::new(theme);
+
+        panel.add_message(ChatMessage::User("1".to_string()));
+        panel.add_message(ChatMessage::User("2".to_string()));
+        panel.add_message(ChatMessage::User("3".to_string()));
+
+        assert_eq!(panel.focused_index(), None);
+
+        panel.focus_next();
+        assert_eq!(panel.focused_index(), Some(0));
+
+        panel.focus_next();
+        assert_eq!(panel.focused_index(), Some(1));
+
+        panel.focus_previous();
+        assert_eq!(panel.focused_index(), Some(0));
+    }
+}

crates/app/ui/src/components/command_help.rs

@@ -0,0 +1,322 @@
+//! Command help overlay component
+//!
+//! Modal overlay that displays available commands in a structured format.
+//! Shown when user types `/help` or `?`. Supports scrolling with j/k or arrows.
+
+use crate::theme::Theme;
+use crossterm::event::{KeyCode, KeyEvent};
+use ratatui::{
+    layout::Rect,
+    style::Style,
+    text::{Line, Span},
+    widgets::{Block, Borders, Clear, Paragraph, Scrollbar, ScrollbarOrientation, ScrollbarState},
+    Frame,
+};
+
+/// A single command definition
+#[derive(Debug, Clone)]
+pub struct Command {
+    pub name: &'static str,
+    pub args: Option<&'static str>,
+    pub description: &'static str,
+}
+
+impl Command {
+    pub const fn new(name: &'static str, description: &'static str) -> Self {
+        Self {
+            name,
+            args: None,
+            description,
+        }
+    }
+
+    pub const fn with_args(name: &'static str, args: &'static str, description: &'static str) -> Self {
+        Self {
+            name,
+            args: Some(args),
+            description,
+        }
+    }
+}
+
+/// Built-in commands
+pub fn builtin_commands() -> Vec<Command> {
+    vec![
+        Command::new("help", "Show this help"),
+        Command::new("status", "Current session info"),
+        Command::with_args("model", "[name]", "Switch model"),
+        Command::with_args("provider", "[name]", "Switch provider (ollama, anthropic, openai)"),
+        Command::new("history", "Browse conversation history"),
+        Command::new("checkpoint", "Save conversation state"),
+        Command::new("checkpoints", "List saved checkpoints"),
+        Command::with_args("rewind", "[id]", "Restore checkpoint"),
+        Command::new("cost", "Show token usage"),
+        Command::new("clear", "Clear conversation"),
+        Command::new("compact", "Compact conversation context"),
+        Command::new("permissions", "Show permission mode"),
+        Command::new("themes", "List available themes"),
+        Command::with_args("theme", "[name]", "Switch theme"),
+        Command::new("exit", "Exit OWLEN"),
+    ]
+}
+
+/// Command help overlay
+pub struct CommandHelp {
+    commands: Vec<Command>,
+    visible: bool,
+    scroll_offset: usize,
+    theme: Theme,
+}
+
+impl CommandHelp {
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            commands: builtin_commands(),
+            visible: false,
+            scroll_offset: 0,
+            theme,
+        }
+    }
+
+    /// Show the help overlay
+    pub fn show(&mut self) {
+        self.visible = true;
+        self.scroll_offset = 0; // Reset scroll when showing
+    }
+
+    /// Hide the help overlay
+    pub fn hide(&mut self) {
+        self.visible = false;
+    }
+
+    /// Check if visible
+    pub fn is_visible(&self) -> bool {
+        self.visible
+    }
+
+    /// Toggle visibility
+    pub fn toggle(&mut self) {
+        self.visible = !self.visible;
+        if self.visible {
+            self.scroll_offset = 0;
+        }
+    }
+
+    /// Scroll up by amount
+    fn scroll_up(&mut self, amount: usize) {
+        self.scroll_offset = self.scroll_offset.saturating_sub(amount);
+    }
+
+    /// Scroll down by amount, respecting max
+    fn scroll_down(&mut self, amount: usize, max_scroll: usize) {
+        self.scroll_offset = (self.scroll_offset + amount).min(max_scroll);
+    }
+
+    /// Handle key input, returns true if overlay handled the key
+    pub fn handle_key(&mut self, key: KeyEvent) -> bool {
+        if !self.visible {
+            return false;
+        }
+
+        // Calculate max scroll (commands + padding lines - visible area)
+        let total_lines = self.commands.len() + 3; // +3 for padding and footer
+        let max_scroll = total_lines.saturating_sub(10); // Assume ~10 visible lines
+
+        match key.code {
+            KeyCode::Esc | KeyCode::Char('q') | KeyCode::Char('?') => {
+                self.hide();
+                true
+            }
+            // Scroll navigation
+            KeyCode::Up | KeyCode::Char('k') => {
+                self.scroll_up(1);
+                true
+            }
+            KeyCode::Down | KeyCode::Char('j') => {
+                self.scroll_down(1, max_scroll);
+                true
+            }
+            KeyCode::PageUp | KeyCode::Char('u') => {
+                self.scroll_up(5);
+                true
+            }
+            KeyCode::PageDown | KeyCode::Char('d') => {
+                self.scroll_down(5, max_scroll);
+                true
+            }
+            KeyCode::Home | KeyCode::Char('g') => {
+                self.scroll_offset = 0;
+                true
+            }
+            KeyCode::End | KeyCode::Char('G') => {
+                self.scroll_offset = max_scroll;
+                true
+            }
+            _ => true, // Consume all other keys while visible
+        }
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Add plugin commands
+    pub fn add_commands(&mut self, commands: Vec<Command>) {
+        self.commands.extend(commands);
+    }
+
+    /// Render the help overlay
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        if !self.visible {
+            return;
+        }
+
+        // Calculate overlay dimensions
+        let width = (area.width as f32 * 0.7).min(65.0) as u16;
+        let max_height = area.height.saturating_sub(4);
+        let content_height = self.commands.len() as u16 + 4; // +4 for padding and footer
+        let height = content_height.min(max_height).max(8);
+
+        // Center the overlay
+        let x = (area.width.saturating_sub(width)) / 2;
+        let y = (area.height.saturating_sub(height)) / 2;
+
+        let overlay_area = Rect::new(x, y, width, height);
+
+        // Clear the area behind the overlay
+        frame.render_widget(Clear, overlay_area);
+
+        // Build content lines
+        let mut lines: Vec<Line> = Vec::new();
+
+        // Empty line for padding
+        lines.push(Line::from(""));
+
+        // Command list
+        for cmd in &self.commands {
+            let name_with_args = if let Some(args) = cmd.args {
+                format!("/{} {}", cmd.name, args)
+            } else {
+                format!("/{}", cmd.name)
+            };
+
+            // Calculate padding for alignment
+            let name_width: usize = 22;
+            let padding = name_width.saturating_sub(name_with_args.len());
+
+            lines.push(Line::from(vec![
+                Span::styled("  ", Style::default()),
+                Span::styled("/", self.theme.cmd_slash),
+                Span::styled(
+                    if let Some(args) = cmd.args {
+                        format!("{} {}", cmd.name, args)
+                    } else {
+                        cmd.name.to_string()
+                    },
+                    self.theme.cmd_name,
+                ),
+                Span::raw(" ".repeat(padding)),
+                Span::styled(cmd.description, self.theme.cmd_desc),
+            ]));
+        }
+
+        // Empty line for padding
+        lines.push(Line::from(""));
+
+        // Footer hint with scroll info
+        let scroll_hint = if self.commands.len() > (height as usize - 4) {
+            format!(" (scroll: j/k or ↑/↓)")
+        } else {
+            String::new()
+        };
+
+        lines.push(Line::from(vec![
+            Span::styled("  Press ", self.theme.cmd_desc),
+            Span::styled("Esc", self.theme.cmd_name),
+            Span::styled(" to close", self.theme.cmd_desc),
+            Span::styled(scroll_hint, self.theme.cmd_desc),
+        ]));
+
+        // Create the block with border
+        let block = Block::default()
+            .title(" Commands ")
+            .title_style(self.theme.popup_title)
+            .borders(Borders::ALL)
+            .border_style(self.theme.popup_border)
+            .style(self.theme.overlay_bg);
+
+        let paragraph = Paragraph::new(lines)
+            .block(block)
+            .scroll((self.scroll_offset as u16, 0));
+
+        frame.render_widget(paragraph, overlay_area);
+
+        // Render scrollbar if content exceeds visible area
+        let visible_height = height.saturating_sub(2) as usize; // -2 for borders
+        let total_lines = self.commands.len() + 3;
+        if total_lines > visible_height {
+            let scrollbar = Scrollbar::default()
+                .orientation(ScrollbarOrientation::VerticalRight)
+                .begin_symbol(None)
+                .end_symbol(None)
+                .track_symbol(Some(" "))
+                .thumb_symbol("│")
+                .style(self.theme.status_dim);
+
+            let mut scrollbar_state = ScrollbarState::default()
+                .content_length(total_lines)
+                .position(self.scroll_offset);
+
+            // Adjust scrollbar area to be inside the border
+            let scrollbar_area = Rect::new(
+                overlay_area.x + overlay_area.width - 2,
+                overlay_area.y + 1,
+                1,
+                overlay_area.height.saturating_sub(2),
+            );
+
+            frame.render_stateful_widget(scrollbar, scrollbar_area, &mut scrollbar_state);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_command_help_visibility() {
+        let theme = Theme::default();
+        let mut help = CommandHelp::new(theme);
+
+        assert!(!help.is_visible());
+        help.show();
+        assert!(help.is_visible());
+        help.hide();
+        assert!(!help.is_visible());
+    }
+
+    #[test]
+    fn test_builtin_commands() {
+        let commands = builtin_commands();
+        assert!(!commands.is_empty());
+        assert!(commands.iter().any(|c| c.name == "help"));
+        assert!(commands.iter().any(|c| c.name == "provider"));
+    }
+
+    #[test]
+    fn test_scroll_navigation() {
+        let theme = Theme::default();
+        let mut help = CommandHelp::new(theme);
+        help.show();
+
+        assert_eq!(help.scroll_offset, 0);
+        help.scroll_down(3, 10);
+        assert_eq!(help.scroll_offset, 3);
+        help.scroll_up(1);
+        assert_eq!(help.scroll_offset, 2);
+        help.scroll_up(10); // Should clamp to 0
+        assert_eq!(help.scroll_offset, 0);
+    }
+}

crates/app/ui/src/components/input_box.rs

@@ -0,0 +1,507 @@
+//! Vim-modal input component
+//!
+//! Borderless input with vim-like modes (Normal, Insert, Command).
+//! Uses mode prefix instead of borders for visual indication.
+
+use crate::theme::{Theme, VimMode};
+use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use ratatui::{
+    layout::Rect,
+    style::Style,
+    text::{Line, Span},
+    widgets::Paragraph,
+    Frame,
+};
+
+/// Input event from the input box
+#[derive(Debug, Clone)]
+pub enum InputEvent {
+    /// User submitted a message
+    Message(String),
+    /// User submitted a command (without / prefix)
+    Command(String),
+    /// Mode changed
+    ModeChange(VimMode),
+    /// Request to cancel current operation
+    Cancel,
+    /// Request to expand input (multiline)
+    Expand,
+}
+
+/// Vim-modal input box
+pub struct InputBox {
+    input: String,
+    cursor_position: usize,
+    history: Vec<String>,
+    history_index: usize,
+    mode: VimMode,
+    theme: Theme,
+}
+
+impl InputBox {
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            input: String::new(),
+            cursor_position: 0,
+            history: Vec::new(),
+            history_index: 0,
+            mode: VimMode::Insert, // Start in insert mode for familiarity
+            theme,
+        }
+    }
+
+    /// Get current vim mode
+    pub fn mode(&self) -> VimMode {
+        self.mode
+    }
+
+    /// Set vim mode
+    pub fn set_mode(&mut self, mode: VimMode) {
+        self.mode = mode;
+    }
+
+    /// Handle key event, returns input event if action is needed
+    pub fn handle_key(&mut self, key: KeyEvent) -> Option<InputEvent> {
+        match self.mode {
+            VimMode::Normal => self.handle_normal_mode(key),
+            VimMode::Insert => self.handle_insert_mode(key),
+            VimMode::Command => self.handle_command_mode(key),
+            VimMode::Visual => self.handle_visual_mode(key),
+        }
+    }
+
+    /// Handle keys in normal mode
+    fn handle_normal_mode(&mut self, key: KeyEvent) -> Option<InputEvent> {
+        match key.code {
+            // Enter insert mode
+            KeyCode::Char('i') => {
+                self.mode = VimMode::Insert;
+                Some(InputEvent::ModeChange(VimMode::Insert))
+            }
+            KeyCode::Char('a') => {
+                self.mode = VimMode::Insert;
+                if self.cursor_position < self.input.len() {
+                    self.cursor_position += 1;
+                }
+                Some(InputEvent::ModeChange(VimMode::Insert))
+            }
+            KeyCode::Char('I') => {
+                self.mode = VimMode::Insert;
+                self.cursor_position = 0;
+                Some(InputEvent::ModeChange(VimMode::Insert))
+            }
+            KeyCode::Char('A') => {
+                self.mode = VimMode::Insert;
+                self.cursor_position = self.input.len();
+                Some(InputEvent::ModeChange(VimMode::Insert))
+            }
+            // Enter command mode
+            KeyCode::Char(':') => {
+                self.mode = VimMode::Command;
+                self.input.clear();
+                self.cursor_position = 0;
+                Some(InputEvent::ModeChange(VimMode::Command))
+            }
+            // Navigation
+            KeyCode::Char('h') | KeyCode::Left => {
+                self.cursor_position = self.cursor_position.saturating_sub(1);
+                None
+            }
+            KeyCode::Char('l') | KeyCode::Right => {
+                if self.cursor_position < self.input.len() {
+                    self.cursor_position += 1;
+                }
+                None
+            }
+            KeyCode::Char('0') | KeyCode::Home => {
+                self.cursor_position = 0;
+                None
+            }
+            KeyCode::Char('$') | KeyCode::End => {
+                self.cursor_position = self.input.len();
+                None
+            }
+            KeyCode::Char('w') => {
+                // Jump to next word
+                self.cursor_position = self.next_word_position();
+                None
+            }
+            KeyCode::Char('b') => {
+                // Jump to previous word
+                self.cursor_position = self.prev_word_position();
+                None
+            }
+            // Editing
+            KeyCode::Char('x') => {
+                if self.cursor_position < self.input.len() {
+                    self.input.remove(self.cursor_position);
+                }
+                None
+            }
+            KeyCode::Char('d') => {
+                // Delete line (dd would require tracking, simplify to clear)
+                self.input.clear();
+                self.cursor_position = 0;
+                None
+            }
+            // History
+            KeyCode::Char('k') | KeyCode::Up => {
+                self.history_prev();
+                None
+            }
+            KeyCode::Char('j') | KeyCode::Down => {
+                self.history_next();
+                None
+            }
+            _ => None,
+        }
+    }
+
+    /// Handle keys in insert mode
+    fn handle_insert_mode(&mut self, key: KeyEvent) -> Option<InputEvent> {
+        match key.code {
+            KeyCode::Esc => {
+                self.mode = VimMode::Normal;
+                // Move cursor back when exiting insert mode (vim behavior)
+                if self.cursor_position > 0 {
+                    self.cursor_position -= 1;
+                }
+                Some(InputEvent::ModeChange(VimMode::Normal))
+            }
+            KeyCode::Enter => {
+                let message = self.input.clone();
+                if !message.trim().is_empty() {
+                    self.history.push(message.clone());
+                    self.history_index = self.history.len();
+                    self.input.clear();
+                    self.cursor_position = 0;
+                    return Some(InputEvent::Message(message));
+                }
+                None
+            }
+            KeyCode::Char('e') if key.modifiers.contains(KeyModifiers::CONTROL) => {
+                Some(InputEvent::Expand)
+            }
+            KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => {
+                Some(InputEvent::Cancel)
+            }
+            KeyCode::Char(c) => {
+                self.input.insert(self.cursor_position, c);
+                self.cursor_position += 1;
+                None
+            }
+            KeyCode::Backspace => {
+                if self.cursor_position > 0 {
+                    self.input.remove(self.cursor_position - 1);
+                    self.cursor_position -= 1;
+                }
+                None
+            }
+            KeyCode::Delete => {
+                if self.cursor_position < self.input.len() {
+                    self.input.remove(self.cursor_position);
+                }
+                None
+            }
+            KeyCode::Left => {
+                self.cursor_position = self.cursor_position.saturating_sub(1);
+                None
+            }
+            KeyCode::Right => {
+                if self.cursor_position < self.input.len() {
+                    self.cursor_position += 1;
+                }
+                None
+            }
+            KeyCode::Home => {
+                self.cursor_position = 0;
+                None
+            }
+            KeyCode::End => {
+                self.cursor_position = self.input.len();
+                None
+            }
+            KeyCode::Up => {
+                self.history_prev();
+                None
+            }
+            KeyCode::Down => {
+                self.history_next();
+                None
+            }
+            _ => None,
+        }
+    }
+
+    /// Handle keys in command mode
+    fn handle_command_mode(&mut self, key: KeyEvent) -> Option<InputEvent> {
+        match key.code {
+            KeyCode::Esc => {
+                self.mode = VimMode::Normal;
+                self.input.clear();
+                self.cursor_position = 0;
+                Some(InputEvent::ModeChange(VimMode::Normal))
+            }
+            KeyCode::Enter => {
+                let command = self.input.clone();
+                self.mode = VimMode::Normal;
+                self.input.clear();
+                self.cursor_position = 0;
+                if !command.trim().is_empty() {
+                    return Some(InputEvent::Command(command));
+                }
+                Some(InputEvent::ModeChange(VimMode::Normal))
+            }
+            KeyCode::Char(c) => {
+                self.input.insert(self.cursor_position, c);
+                self.cursor_position += 1;
+                None
+            }
+            KeyCode::Backspace => {
+                if self.cursor_position > 0 {
+                    self.input.remove(self.cursor_position - 1);
+                    self.cursor_position -= 1;
+                } else {
+                    // Empty command, exit to normal mode
+                    self.mode = VimMode::Normal;
+                    return Some(InputEvent::ModeChange(VimMode::Normal));
+                }
+                None
+            }
+            KeyCode::Left => {
+                self.cursor_position = self.cursor_position.saturating_sub(1);
+                None
+            }
+            KeyCode::Right => {
+                if self.cursor_position < self.input.len() {
+                    self.cursor_position += 1;
+                }
+                None
+            }
+            _ => None,
+        }
+    }
+
+    /// Handle keys in visual mode (simplified)
+    fn handle_visual_mode(&mut self, key: KeyEvent) -> Option<InputEvent> {
+        match key.code {
+            KeyCode::Esc => {
+                self.mode = VimMode::Normal;
+                Some(InputEvent::ModeChange(VimMode::Normal))
+            }
+            _ => None,
+        }
+    }
+
+    /// History navigation - previous
+    fn history_prev(&mut self) {
+        if !self.history.is_empty() && self.history_index > 0 {
+            self.history_index -= 1;
+            self.input = self.history[self.history_index].clone();
+            self.cursor_position = self.input.len();
+        }
+    }
+
+    /// History navigation - next
+    fn history_next(&mut self) {
+        if self.history_index < self.history.len().saturating_sub(1) {
+            self.history_index += 1;
+            self.input = self.history[self.history_index].clone();
+            self.cursor_position = self.input.len();
+        } else if self.history_index < self.history.len() {
+            self.history_index = self.history.len();
+            self.input.clear();
+            self.cursor_position = 0;
+        }
+    }
+
+    /// Find next word position
+    fn next_word_position(&self) -> usize {
+        let bytes = self.input.as_bytes();
+        let mut pos = self.cursor_position;
+
+        // Skip current word
+        while pos < bytes.len() && !bytes[pos].is_ascii_whitespace() {
+            pos += 1;
+        }
+        // Skip whitespace
+        while pos < bytes.len() && bytes[pos].is_ascii_whitespace() {
+            pos += 1;
+        }
+        pos
+    }
+
+    /// Find previous word position
+    fn prev_word_position(&self) -> usize {
+        let bytes = self.input.as_bytes();
+        let mut pos = self.cursor_position.saturating_sub(1);
+
+        // Skip whitespace
+        while pos > 0 && bytes[pos].is_ascii_whitespace() {
+            pos -= 1;
+        }
+        // Skip to start of word
+        while pos > 0 && !bytes[pos - 1].is_ascii_whitespace() {
+            pos -= 1;
+        }
+        pos
+    }
+
+    /// Render the borderless input (single line)
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        let is_empty = self.input.is_empty();
+        let symbols = &self.theme.symbols;
+
+        // Mode-specific prefix
+        let prefix = match self.mode {
+            VimMode::Normal => Span::styled(
+                format!("{} ", symbols.mode_normal),
+                self.theme.status_dim,
+            ),
+            VimMode::Insert => Span::styled(
+                format!("{} ", symbols.user_prefix),
+                self.theme.input_prefix,
+            ),
+            VimMode::Command => Span::styled(
+                ": ",
+                self.theme.input_prefix,
+            ),
+            VimMode::Visual => Span::styled(
+                format!("{} ", symbols.mode_visual),
+                self.theme.status_accent,
+            ),
+        };
+
+        // Cursor position handling
+        let (text_before, cursor_char, text_after) = if self.cursor_position < self.input.len() {
+            let before = &self.input[..self.cursor_position];
+            let cursor = &self.input[self.cursor_position..self.cursor_position + 1];
+            let after = &self.input[self.cursor_position + 1..];
+            (before, cursor, after)
+        } else {
+            (&self.input[..], " ", "")
+        };
+
+        let line = if is_empty && self.mode == VimMode::Insert {
+            Line::from(vec![
+                Span::raw("  "),
+                prefix,
+                Span::styled("▊", self.theme.input_prefix),
+                Span::styled(" Type message...", self.theme.input_placeholder),
+            ])
+        } else if is_empty && self.mode == VimMode::Command {
+            Line::from(vec![
+                Span::raw("  "),
+                prefix,
+                Span::styled("▊", self.theme.input_prefix),
+            ])
+        } else {
+            // Build cursor span with appropriate styling
+            let cursor_style = if self.mode == VimMode::Normal {
+                Style::default()
+                    .bg(self.theme.palette.fg)
+                    .fg(self.theme.palette.bg)
+            } else {
+                self.theme.input_prefix
+            };
+
+            let cursor_span = if self.mode == VimMode::Normal && !is_empty {
+                Span::styled(cursor_char.to_string(), cursor_style)
+            } else {
+                Span::styled("▊", self.theme.input_prefix)
+            };
+
+            Line::from(vec![
+                Span::raw("  "),
+                prefix,
+                Span::styled(text_before.to_string(), self.theme.input_text),
+                cursor_span,
+                Span::styled(text_after.to_string(), self.theme.input_text),
+            ])
+        };
+
+        let paragraph = Paragraph::new(line);
+        frame.render_widget(paragraph, area);
+    }
+
+    /// Clear input
+    pub fn clear(&mut self) {
+        self.input.clear();
+        self.cursor_position = 0;
+    }
+
+    /// Get current input text
+    pub fn text(&self) -> &str {
+        &self.input
+    }
+
+    /// Set input text
+    pub fn set_text(&mut self, text: String) {
+        self.input = text;
+        self.cursor_position = self.input.len();
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_mode_transitions() {
+        let theme = Theme::default();
+        let mut input = InputBox::new(theme);
+
+        // Start in insert mode
+        assert_eq!(input.mode(), VimMode::Insert);
+
+        // Escape to normal mode
+        let event = input.handle_key(KeyEvent::from(KeyCode::Esc));
+        assert!(matches!(event, Some(InputEvent::ModeChange(VimMode::Normal))));
+        assert_eq!(input.mode(), VimMode::Normal);
+
+        // 'i' to insert mode
+        let event = input.handle_key(KeyEvent::from(KeyCode::Char('i')));
+        assert!(matches!(event, Some(InputEvent::ModeChange(VimMode::Insert))));
+        assert_eq!(input.mode(), VimMode::Insert);
+    }
+
+    #[test]
+    fn test_insert_text() {
+        let theme = Theme::default();
+        let mut input = InputBox::new(theme);
+
+        input.handle_key(KeyEvent::from(KeyCode::Char('h')));
+        input.handle_key(KeyEvent::from(KeyCode::Char('i')));
+
+        assert_eq!(input.text(), "hi");
+    }
+
+    #[test]
+    fn test_command_mode() {
+        let theme = Theme::default();
+        let mut input = InputBox::new(theme);
+
+        // Escape to normal, then : to command
+        input.handle_key(KeyEvent::from(KeyCode::Esc));
+        input.handle_key(KeyEvent::from(KeyCode::Char(':')));
+
+        assert_eq!(input.mode(), VimMode::Command);
+
+        // Type command
+        input.handle_key(KeyEvent::from(KeyCode::Char('q')));
+        input.handle_key(KeyEvent::from(KeyCode::Char('u')));
+        input.handle_key(KeyEvent::from(KeyCode::Char('i')));
+        input.handle_key(KeyEvent::from(KeyCode::Char('t')));
+
+        assert_eq!(input.text(), "quit");
+
+        // Submit command
+        let event = input.handle_key(KeyEvent::from(KeyCode::Enter));
+        assert!(matches!(event, Some(InputEvent::Command(cmd)) if cmd == "quit"));
+    }
+}

crates/app/ui/src/components/mod.rs

@@ -0,0 +1,23 @@
+//! TUI components for the borderless multi-provider design
+
+mod autocomplete;
+mod chat_panel;
+mod command_help;
+mod input_box;
+mod model_picker;
+mod permission_popup;
+mod plan_panel;
+mod provider_tabs;
+mod status_bar;
+mod todo_panel;
+
+pub use autocomplete::{Autocomplete, AutocompleteOption, AutocompleteResult};
+pub use chat_panel::{ChatMessage, ChatPanel, DisplayMessage};
+pub use command_help::{Command, CommandHelp};
+pub use input_box::{InputBox, InputEvent};
+pub use model_picker::{ModelPicker, PickerResult, PickerState};
+pub use permission_popup::{PermissionOption, PermissionPopup};
+pub use plan_panel::PlanPanel;
+pub use provider_tabs::ProviderTabs;
+pub use status_bar::{AppState, StatusBar};
+pub use todo_panel::TodoPanel;

crates/app/ui/src/components/model_picker.rs

@@ -0,0 +1,811 @@
+//! Model Picker Component
+//!
+//! A dropdown-style picker for selecting models from the current provider.
+//! Triggered by pressing 'm' when input is empty or in Normal mode.
+
+use crate::theme::Theme;
+use crossterm::event::{KeyCode, KeyEvent};
+use llm_core::{ModelInfo, ProviderType};
+use ratatui::{
+    layout::Rect,
+    style::{Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Clear, Paragraph},
+    Frame,
+};
+
+/// Result of handling a key event in the model picker
+pub enum PickerResult {
+    /// Model was selected
+    Selected(String),
+    /// Picker was cancelled
+    Cancelled,
+    /// Key was handled, no action needed
+    Handled,
+    /// Key was not handled
+    NotHandled,
+}
+
+/// State of the model picker
+#[derive(Debug, Clone, PartialEq)]
+pub enum PickerState {
+    /// Picker is hidden
+    Hidden,
+    /// Loading models from provider
+    Loading,
+    /// Picker is ready with models
+    Ready,
+    /// Error loading models
+    Error(String),
+}
+
+/// Maximum number of visible models in the picker
+const MAX_VISIBLE_MODELS: usize = 10;
+
+/// Model picker dropdown component
+pub struct ModelPicker {
+    /// Available models for the current provider
+    models: Vec<ModelInfo>,
+    /// Currently selected index (within filtered_indices)
+    selected_index: usize,
+    /// Scroll offset for the visible window
+    scroll_offset: usize,
+    /// Picker state (hidden, loading, ready, error)
+    state: PickerState,
+    /// Filter text for searching models
+    filter: String,
+    /// Filtered model indices
+    filtered_indices: Vec<usize>,
+    /// Theme for styling
+    theme: Theme,
+    /// Provider name for display
+    provider_name: String,
+    /// Current provider type (for fallback models)
+    provider_type: Option<ProviderType>,
+}
+
+impl ModelPicker {
+    /// Create a new model picker
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            models: Vec::new(),
+            selected_index: 0,
+            scroll_offset: 0,
+            state: PickerState::Hidden,
+            filter: String::new(),
+            filtered_indices: Vec::new(),
+            theme,
+            provider_name: String::new(),
+            provider_type: None,
+        }
+    }
+
+    /// Show the loading state while fetching models
+    pub fn show_loading(&mut self, provider_type: ProviderType) {
+        // Capitalize provider name for display
+        let name = provider_type.to_string();
+        self.provider_name = capitalize_first(&name);
+        self.provider_type = Some(provider_type);
+        self.models.clear();
+        self.filtered_indices.clear();
+        self.filter.clear();
+        self.scroll_offset = 0;
+        self.state = PickerState::Loading;
+    }
+
+    /// Show the picker with models for a provider
+    pub fn show(&mut self, models: Vec<ModelInfo>, provider_name: &str, current_model: &str) {
+        self.models = models;
+        self.provider_name = provider_name.to_string();
+        self.filter.clear();
+        self.scroll_offset = 0;
+        self.update_filter();
+
+        // Find and select current model (index within filtered_indices)
+        let model_idx = self
+            .models
+            .iter()
+            .position(|m| m.id == current_model)
+            .unwrap_or(0);
+
+        // Find position in filtered list
+        self.selected_index = self
+            .filtered_indices
+            .iter()
+            .position(|&i| i == model_idx)
+            .unwrap_or(0);
+
+        // Adjust scroll to show selected item
+        self.ensure_selected_visible();
+
+        self.state = PickerState::Ready;
+    }
+
+    /// Show an error state
+    pub fn show_error(&mut self, error: String) {
+        self.state = PickerState::Error(error);
+    }
+
+    /// Hide the picker
+    pub fn hide(&mut self) {
+        self.state = PickerState::Hidden;
+        self.filter.clear();
+        self.provider_type = None;
+    }
+
+    /// Check if picker is visible (any non-hidden state)
+    pub fn is_visible(&self) -> bool {
+        !matches!(self.state, PickerState::Hidden)
+    }
+
+    /// Get current picker state
+    pub fn state(&self) -> &PickerState {
+        &self.state
+    }
+
+    /// Use fallback models for the current provider
+    pub fn use_fallback_models(&mut self, current_model: &str) {
+        if let Some(provider_type) = self.provider_type {
+            let models = get_fallback_models(provider_type);
+            if !models.is_empty() {
+                self.show(models, &provider_type.to_string(), current_model);
+            } else {
+                self.show_error("No models available".to_string());
+            }
+        }
+    }
+
+    /// Update the theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Update filter and recalculate visible models
+    fn update_filter(&mut self) {
+        let filter_lower = self.filter.to_lowercase();
+        self.filtered_indices = self
+            .models
+            .iter()
+            .enumerate()
+            .filter(|(_, m)| {
+                if filter_lower.is_empty() {
+                    true
+                } else {
+                    m.id.to_lowercase().contains(&filter_lower)
+                        || m.display_name
+                            .as_ref()
+                            .map(|n| n.to_lowercase().contains(&filter_lower))
+                            .unwrap_or(false)
+                }
+            })
+            .map(|(i, _)| i)
+            .collect();
+
+        // Reset selection to first item and scroll to top when filter changes
+        self.selected_index = 0;
+        self.scroll_offset = 0;
+    }
+
+    /// Handle a key event
+    pub fn handle_key(&mut self, key: KeyEvent, current_model: &str) -> PickerResult {
+        // Handle different states
+        match &self.state {
+            PickerState::Hidden => return PickerResult::NotHandled,
+            PickerState::Loading => {
+                // Only allow escape while loading
+                if key.code == KeyCode::Esc {
+                    self.hide();
+                    return PickerResult::Cancelled;
+                }
+                return PickerResult::Handled;
+            }
+            PickerState::Error(_) => {
+                match key.code {
+                    KeyCode::Esc => {
+                        self.hide();
+                        return PickerResult::Cancelled;
+                    }
+                    KeyCode::Char('f') | KeyCode::Char('F') => {
+                        // Use fallback models
+                        self.use_fallback_models(current_model);
+                        return PickerResult::Handled;
+                    }
+                    _ => return PickerResult::Handled,
+                }
+            }
+            PickerState::Ready => {
+                // Fall through to model selection logic
+            }
+        }
+
+        // Ready state - handle model selection
+        match key.code {
+            KeyCode::Esc => {
+                self.hide();
+                PickerResult::Cancelled
+            }
+            KeyCode::Enter => {
+                // selected_index is position in filtered_indices
+                // get the actual model index, then the model
+                if let Some(&model_idx) = self.filtered_indices.get(self.selected_index) {
+                    let model_id = self.models[model_idx].id.clone();
+                    self.hide();
+                    PickerResult::Selected(model_id)
+                } else {
+                    PickerResult::Cancelled
+                }
+            }
+            KeyCode::Up | KeyCode::Char('k') => {
+                self.select_previous();
+                PickerResult::Handled
+            }
+            KeyCode::Down | KeyCode::Char('j') => {
+                self.select_next();
+                PickerResult::Handled
+            }
+            KeyCode::Char(c) => {
+                self.filter.push(c);
+                self.update_filter();
+                PickerResult::Handled
+            }
+            KeyCode::Backspace => {
+                self.filter.pop();
+                self.update_filter();
+                PickerResult::Handled
+            }
+            _ => PickerResult::NotHandled,
+        }
+    }
+
+    /// Select next model (selected_index is position in filtered_indices)
+    fn select_next(&mut self) {
+        if self.filtered_indices.is_empty() {
+            return;
+        }
+        // Move to next position (wrapping)
+        self.selected_index = (self.selected_index + 1) % self.filtered_indices.len();
+        self.ensure_selected_visible();
+    }
+
+    /// Select previous model (selected_index is position in filtered_indices)
+    fn select_previous(&mut self) {
+        if self.filtered_indices.is_empty() {
+            return;
+        }
+        // Move to previous position (wrapping)
+        if self.selected_index == 0 {
+            self.selected_index = self.filtered_indices.len() - 1;
+        } else {
+            self.selected_index -= 1;
+        }
+        self.ensure_selected_visible();
+    }
+
+    /// Ensure the selected item is visible by adjusting scroll_offset
+    fn ensure_selected_visible(&mut self) {
+        // If selected is above the visible window, scroll up
+        if self.selected_index < self.scroll_offset {
+            self.scroll_offset = self.selected_index;
+        }
+        // If selected is below the visible window, scroll down
+        else if self.selected_index >= self.scroll_offset + MAX_VISIBLE_MODELS {
+            self.scroll_offset = self.selected_index.saturating_sub(MAX_VISIBLE_MODELS - 1);
+        }
+    }
+
+    /// Render the model picker as a centered modal
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        match &self.state {
+            PickerState::Hidden => return,
+            PickerState::Loading => self.render_loading(frame, area),
+            PickerState::Ready => self.render_models(frame, area),
+            PickerState::Error(msg) => self.render_error(frame, area, msg),
+        }
+    }
+
+    /// Render the loading state
+    fn render_loading(&self, frame: &mut Frame, area: Rect) {
+        let modal_width = 50.min(area.width.saturating_sub(4));
+        let modal_height = 5;
+
+        let modal_x = (area.width.saturating_sub(modal_width)) / 2;
+        let modal_y = (area.height.saturating_sub(modal_height)) / 2;
+
+        let modal_area = Rect {
+            x: modal_x,
+            y: modal_y,
+            width: modal_width,
+            height: modal_height,
+        };
+
+        frame.render_widget(Clear, modal_area);
+
+        let lines = vec![
+            Line::from(Span::styled(
+                format!("Model Picker - {}", self.provider_name),
+                Style::default()
+                    .fg(self.theme.palette.accent)
+                    .add_modifier(Modifier::BOLD),
+            )),
+            Line::from(""),
+            Line::from(Span::styled(
+                "Loading models...",
+                self.theme.status_dim,
+            )),
+        ];
+
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .border_style(Style::default().fg(self.theme.palette.border))
+            .style(Style::default().bg(self.theme.palette.overlay_bg));
+
+        let paragraph = Paragraph::new(lines).block(block);
+        frame.render_widget(paragraph, modal_area);
+    }
+
+    /// Render the error state
+    fn render_error(&self, frame: &mut Frame, area: Rect, error: &str) {
+        let modal_width = 60.min(area.width.saturating_sub(4));
+        let modal_height = 7;
+
+        let modal_x = (area.width.saturating_sub(modal_width)) / 2;
+        let modal_y = (area.height.saturating_sub(modal_height)) / 2;
+
+        let modal_area = Rect {
+            x: modal_x,
+            y: modal_y,
+            width: modal_width,
+            height: modal_height,
+        };
+
+        frame.render_widget(Clear, modal_area);
+
+        let lines = vec![
+            Line::from(Span::styled(
+                format!("Model Picker - {}", self.provider_name),
+                Style::default()
+                    .fg(self.theme.palette.accent)
+                    .add_modifier(Modifier::BOLD),
+            )),
+            Line::from(""),
+            Line::from(Span::styled(
+                format!("Error: {}", error),
+                Style::default().fg(self.theme.palette.error),
+            )),
+            Line::from(""),
+            Line::from(Span::styled(
+                "Press [f] for fallback models, [Esc] to close",
+                self.theme.status_dim,
+            )),
+        ];
+
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .border_style(Style::default().fg(self.theme.palette.border))
+            .style(Style::default().bg(self.theme.palette.overlay_bg));
+
+        let paragraph = Paragraph::new(lines).block(block);
+        frame.render_widget(paragraph, modal_area);
+    }
+
+    /// Render the model list
+    fn render_models(&self, frame: &mut Frame, area: Rect) {
+        if self.models.is_empty() {
+            return;
+        }
+
+        // Calculate visible window
+        let total_models = self.filtered_indices.len();
+        let visible_count = total_models.min(MAX_VISIBLE_MODELS);
+
+        // Calculate modal dimensions
+        let modal_width = 60.min(area.width.saturating_sub(4));
+        let modal_height = visible_count as u16 + 6; // 2 for border, 1 for header, 1 for filter, 1 for separator, 1 for scroll hint
+
+        let modal_x = (area.width.saturating_sub(modal_width)) / 2;
+        let modal_y = (area.height.saturating_sub(modal_height)) / 2;
+
+        let modal_area = Rect {
+            x: modal_x,
+            y: modal_y,
+            width: modal_width,
+            height: modal_height,
+        };
+
+        // Clear background
+        frame.render_widget(Clear, modal_area);
+
+        // Build the modal content
+        let mut lines = Vec::new();
+
+        // Header with provider name and count
+        let header = if total_models > MAX_VISIBLE_MODELS {
+            format!(
+                "Select Model - {} ({}-{}/{})",
+                self.provider_name,
+                self.scroll_offset + 1,
+                (self.scroll_offset + visible_count).min(total_models),
+                total_models
+            )
+        } else {
+            format!("Select Model - {} ({})", self.provider_name, total_models)
+        };
+
+        lines.push(Line::from(vec![
+            Span::styled(
+                header,
+                Style::default()
+                    .fg(self.theme.palette.accent)
+                    .add_modifier(Modifier::BOLD),
+            ),
+        ]));
+
+        // Filter line
+        let filter_text = if self.filter.is_empty() {
+            "Type to filter... (j/k to navigate, Enter to select)".to_string()
+        } else {
+            format!("Filter: {}", self.filter)
+        };
+        lines.push(Line::from(Span::styled(
+            filter_text,
+            self.theme.status_dim,
+        )));
+
+        // Separator
+        lines.push(Line::from(Span::styled(
+            "─".repeat((modal_width - 2) as usize),
+            self.theme.status_dim,
+        )));
+
+        // Show scroll up indicator if needed
+        if self.scroll_offset > 0 {
+            lines.push(Line::from(Span::styled(
+                "  ▲ more above",
+                self.theme.status_dim,
+            )));
+        }
+
+        // Model list - show visible window based on scroll_offset
+        let visible_range = self.scroll_offset..(self.scroll_offset + visible_count).min(total_models);
+        for (display_idx, &model_idx) in self.filtered_indices.iter().enumerate() {
+            // Skip items outside visible window
+            if display_idx < visible_range.start || display_idx >= visible_range.end {
+                continue;
+            }
+
+            let model = &self.models[model_idx];
+            let is_selected = display_idx == self.selected_index;
+
+            let display_name = model
+                .display_name
+                .as_ref()
+                .unwrap_or(&model.id)
+                .clone();
+
+            // Build model line
+            let prefix = if is_selected { "▶ " } else { "  " };
+
+            let tool_indicator = if model.supports_tools { " [tools]" } else { "" };
+            let vision_indicator = if model.supports_vision { " [vision]" } else { "" };
+
+            let style = if is_selected {
+                Style::default()
+                    .fg(self.theme.palette.accent)
+                    .add_modifier(Modifier::BOLD)
+            } else {
+                Style::default().fg(self.theme.palette.fg)
+            };
+
+            lines.push(Line::from(vec![
+                Span::styled(prefix, style),
+                Span::styled(display_name, style),
+                Span::styled(
+                    format!("{}{}", tool_indicator, vision_indicator),
+                    self.theme.status_dim,
+                ),
+            ]));
+
+            // Add pricing info on a second line for selected model
+            if is_selected {
+                if let (Some(input_price), Some(output_price)) =
+                    (model.input_price_per_mtok, model.output_price_per_mtok)
+                {
+                    lines.push(Line::from(Span::styled(
+                        format!(
+                            "    ${:.2}/MTok in, ${:.2}/MTok out",
+                            input_price, output_price
+                        ),
+                        self.theme.status_dim,
+                    )));
+                }
+            }
+        }
+
+        // Show scroll down indicator if needed
+        if self.scroll_offset + visible_count < total_models {
+            lines.push(Line::from(Span::styled(
+                format!("  ▼ {} more below", total_models - self.scroll_offset - visible_count),
+                self.theme.status_dim,
+            )));
+        }
+
+        // Render
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .border_style(Style::default().fg(self.theme.palette.border))
+            .style(Style::default().bg(self.theme.palette.overlay_bg));
+
+        let paragraph = Paragraph::new(lines).block(block);
+        frame.render_widget(paragraph, modal_area);
+    }
+}
+
+/// Capitalize the first letter of a string
+fn capitalize_first(s: &str) -> String {
+    let mut chars = s.chars();
+    match chars.next() {
+        None => String::new(),
+        Some(first) => first.to_uppercase().chain(chars).collect(),
+    }
+}
+
+/// Get fallback models for a provider when API call fails
+fn get_fallback_models(provider: ProviderType) -> Vec<ModelInfo> {
+    match provider {
+        ProviderType::Ollama => vec![
+            ModelInfo {
+                id: "qwen3:8b".to_string(),
+                display_name: Some("Qwen 3 8B".to_string()),
+                description: Some("Efficient reasoning model with tool support".to_string()),
+                context_window: Some(32768),
+                max_output_tokens: Some(8192),
+                supports_tools: true,
+                supports_vision: false,
+                input_price_per_mtok: None,
+                output_price_per_mtok: None,
+            },
+            ModelInfo {
+                id: "llama3.2:latest".to_string(),
+                display_name: Some("Llama 3.2".to_string()),
+                description: Some("Meta's latest model with vision".to_string()),
+                context_window: Some(128000),
+                max_output_tokens: Some(4096),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: None,
+                output_price_per_mtok: None,
+            },
+            ModelInfo {
+                id: "deepseek-coder-v2:latest".to_string(),
+                display_name: Some("DeepSeek Coder V2".to_string()),
+                description: Some("Coding-focused model".to_string()),
+                context_window: Some(65536),
+                max_output_tokens: Some(8192),
+                supports_tools: true,
+                supports_vision: false,
+                input_price_per_mtok: None,
+                output_price_per_mtok: None,
+            },
+            ModelInfo {
+                id: "mistral:latest".to_string(),
+                display_name: Some("Mistral 7B".to_string()),
+                description: Some("Fast and efficient model".to_string()),
+                context_window: Some(32768),
+                max_output_tokens: Some(4096),
+                supports_tools: true,
+                supports_vision: false,
+                input_price_per_mtok: None,
+                output_price_per_mtok: None,
+            },
+        ],
+        ProviderType::Anthropic => vec![
+            ModelInfo {
+                id: "claude-sonnet-4-20250514".to_string(),
+                display_name: Some("Claude Sonnet 4".to_string()),
+                description: Some("Best balance of speed and capability".to_string()),
+                context_window: Some(200000),
+                max_output_tokens: Some(8192),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(3.0),
+                output_price_per_mtok: Some(15.0),
+            },
+            ModelInfo {
+                id: "claude-opus-4-20250514".to_string(),
+                display_name: Some("Claude Opus 4".to_string()),
+                description: Some("Most capable model".to_string()),
+                context_window: Some(200000),
+                max_output_tokens: Some(8192),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(15.0),
+                output_price_per_mtok: Some(75.0),
+            },
+            ModelInfo {
+                id: "claude-haiku-3-5-20241022".to_string(),
+                display_name: Some("Claude Haiku 3.5".to_string()),
+                description: Some("Fast and affordable".to_string()),
+                context_window: Some(200000),
+                max_output_tokens: Some(8192),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(0.80),
+                output_price_per_mtok: Some(4.0),
+            },
+        ],
+        ProviderType::OpenAI => vec![
+            ModelInfo {
+                id: "gpt-4o".to_string(),
+                display_name: Some("GPT-4o".to_string()),
+                description: Some("Most capable GPT-4 model".to_string()),
+                context_window: Some(128000),
+                max_output_tokens: Some(16384),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(2.50),
+                output_price_per_mtok: Some(10.0),
+            },
+            ModelInfo {
+                id: "gpt-4o-mini".to_string(),
+                display_name: Some("GPT-4o Mini".to_string()),
+                description: Some("Fast and affordable GPT-4".to_string()),
+                context_window: Some(128000),
+                max_output_tokens: Some(16384),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(0.15),
+                output_price_per_mtok: Some(0.60),
+            },
+            ModelInfo {
+                id: "gpt-4-turbo".to_string(),
+                display_name: Some("GPT-4 Turbo".to_string()),
+                description: Some("Previous generation GPT-4".to_string()),
+                context_window: Some(128000),
+                max_output_tokens: Some(4096),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(10.0),
+                output_price_per_mtok: Some(30.0),
+            },
+            ModelInfo {
+                id: "o1".to_string(),
+                display_name: Some("o1".to_string()),
+                description: Some("Reasoning model".to_string()),
+                context_window: Some(200000),
+                max_output_tokens: Some(100000),
+                supports_tools: false,
+                supports_vision: true,
+                input_price_per_mtok: Some(15.0),
+                output_price_per_mtok: Some(60.0),
+            },
+        ],
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn create_test_models() -> Vec<ModelInfo> {
+        vec![
+            ModelInfo {
+                id: "model-a".to_string(),
+                display_name: Some("Model A".to_string()),
+                description: None,
+                context_window: Some(4096),
+                max_output_tokens: Some(1024),
+                supports_tools: true,
+                supports_vision: false,
+                input_price_per_mtok: Some(1.0),
+                output_price_per_mtok: Some(2.0),
+            },
+            ModelInfo {
+                id: "model-b".to_string(),
+                display_name: Some("Model B".to_string()),
+                description: None,
+                context_window: Some(8192),
+                max_output_tokens: Some(2048),
+                supports_tools: true,
+                supports_vision: true,
+                input_price_per_mtok: Some(0.5),
+                output_price_per_mtok: Some(1.0),
+            },
+        ]
+    }
+
+    #[test]
+    fn test_model_picker_show_hide() {
+        let theme = Theme::default();
+        let mut picker = ModelPicker::new(theme);
+
+        assert!(!picker.is_visible());
+        assert_eq!(*picker.state(), PickerState::Hidden);
+
+        picker.show(create_test_models(), "Test Provider", "model-a");
+        assert!(picker.is_visible());
+        assert_eq!(*picker.state(), PickerState::Ready);
+
+        picker.hide();
+        assert!(!picker.is_visible());
+        assert_eq!(*picker.state(), PickerState::Hidden);
+    }
+
+    #[test]
+    fn test_model_picker_loading_state() {
+        let theme = Theme::default();
+        let mut picker = ModelPicker::new(theme);
+
+        picker.show_loading(ProviderType::Anthropic);
+        assert!(picker.is_visible());
+        assert_eq!(*picker.state(), PickerState::Loading);
+        // Provider name is capitalized for display
+        assert_eq!(picker.provider_name, "Anthropic");
+    }
+
+    #[test]
+    fn test_model_picker_error_state() {
+        let theme = Theme::default();
+        let mut picker = ModelPicker::new(theme);
+
+        picker.show_loading(ProviderType::Ollama);
+        picker.show_error("Connection refused".to_string());
+        assert!(picker.is_visible());
+        assert!(matches!(picker.state(), PickerState::Error(_)));
+    }
+
+    #[test]
+    fn test_model_picker_fallback_models() {
+        let theme = Theme::default();
+        let mut picker = ModelPicker::new(theme);
+
+        // Start in loading state
+        picker.show_loading(ProviderType::Anthropic);
+        picker.show_error("API error".to_string());
+
+        // Use fallback models
+        picker.use_fallback_models("claude-sonnet-4-20250514");
+
+        assert!(picker.is_visible());
+        assert_eq!(*picker.state(), PickerState::Ready);
+        assert!(!picker.models.is_empty());
+    }
+
+    #[test]
+    fn test_model_picker_navigation() {
+        let theme = Theme::default();
+        let mut picker = ModelPicker::new(theme);
+
+        picker.show(create_test_models(), "Test Provider", "model-a");
+        assert_eq!(picker.selected_index, 0);
+
+        picker.select_next();
+        assert_eq!(picker.selected_index, 1);
+
+        picker.select_next();
+        assert_eq!(picker.selected_index, 0); // Wraps around
+
+        picker.select_previous();
+        assert_eq!(picker.selected_index, 1);
+    }
+
+    #[test]
+    fn test_model_picker_filter() {
+        let theme = Theme::default();
+        let mut picker = ModelPicker::new(theme);
+
+        picker.show(create_test_models(), "Test Provider", "model-a");
+        assert_eq!(picker.filtered_indices.len(), 2);
+
+        picker.filter = "model-b".to_string();
+        picker.update_filter();
+        assert_eq!(picker.filtered_indices.len(), 1);
+        assert_eq!(picker.filtered_indices[0], 1);
+    }
+
+    #[test]
+    fn test_fallback_models_exist_for_all_providers() {
+        assert!(!get_fallback_models(ProviderType::Ollama).is_empty());
+        assert!(!get_fallback_models(ProviderType::Anthropic).is_empty());
+        assert!(!get_fallback_models(ProviderType::OpenAI).is_empty());
+    }
+}

crates/app/ui/src/components/permission_popup.rs

@@ -0,0 +1,196 @@
+use crate::theme::Theme;
+use crossterm::event::{KeyCode, KeyEvent};
+use permissions::PermissionDecision;
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Clear, Paragraph},
+    Frame,
+};
+
+#[derive(Debug, Clone)]
+pub enum PermissionOption {
+    AllowOnce,
+    AlwaysAllow,
+    Deny,
+    Explain,
+}
+
+pub struct PermissionPopup {
+    tool: String,
+    context: Option<String>,
+    selected: usize,
+    theme: Theme,
+}
+
+impl PermissionPopup {
+    pub fn new(tool: String, context: Option<String>, theme: Theme) -> Self {
+        Self {
+            tool,
+            context,
+            selected: 0,
+            theme,
+        }
+    }
+
+    pub fn handle_key(&mut self, key: KeyEvent) -> Option<PermissionOption> {
+        match key.code {
+            KeyCode::Char('a') => Some(PermissionOption::AllowOnce),
+            KeyCode::Char('A') => Some(PermissionOption::AlwaysAllow),
+            KeyCode::Char('d') => Some(PermissionOption::Deny),
+            KeyCode::Char('?') => Some(PermissionOption::Explain),
+            KeyCode::Up => {
+                self.selected = self.selected.saturating_sub(1);
+                None
+            }
+            KeyCode::Down => {
+                if self.selected < 3 {
+                    self.selected += 1;
+                }
+                None
+            }
+            KeyCode::Enter => match self.selected {
+                0 => Some(PermissionOption::AllowOnce),
+                1 => Some(PermissionOption::AlwaysAllow),
+                2 => Some(PermissionOption::Deny),
+                3 => Some(PermissionOption::Explain),
+                _ => None,
+            },
+            KeyCode::Esc => Some(PermissionOption::Deny),
+            _ => None,
+        }
+    }
+
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        // Center the popup
+        let popup_area = crate::layout::AppLayout::center_popup(area, 64, 14);
+
+        // Clear the area behind the popup
+        frame.render_widget(Clear, popup_area);
+
+        // Render popup with styled border
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .border_style(self.theme.popup_border)
+            .style(self.theme.popup_bg)
+            .title(Line::from(vec![
+                Span::raw(" "),
+                Span::styled("🔒", self.theme.popup_title),
+                Span::raw(" "),
+                Span::styled("Permission Required", self.theme.popup_title),
+                Span::raw(" "),
+            ]));
+
+        frame.render_widget(block, popup_area);
+
+        // Split popup into sections
+        let inner = popup_area.inner(ratatui::layout::Margin {
+            vertical: 1,
+            horizontal: 2,
+        });
+
+        let sections = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Length(2), // Tool name with box
+                Constraint::Length(3), // Context (if any)
+                Constraint::Length(1), // Separator
+                Constraint::Length(1), // Option 1
+                Constraint::Length(1), // Option 2
+                Constraint::Length(1), // Option 3
+                Constraint::Length(1), // Option 4
+                Constraint::Length(1), // Help text
+            ])
+            .split(inner);
+
+        // Tool name with highlight
+        let tool_line = Line::from(vec![
+            Span::styled("⚡ Tool: ", Style::default().fg(self.theme.palette.warning)),
+            Span::styled(&self.tool, self.theme.popup_title),
+        ]);
+        frame.render_widget(Paragraph::new(tool_line), sections[0]);
+
+        // Context with wrapping
+        if let Some(ctx) = &self.context {
+            let context_text = if ctx.len() > 100 {
+                format!("{}...", &ctx[..100])
+            } else {
+                ctx.clone()
+            };
+            let context_lines = textwrap::wrap(&context_text, (sections[1].width - 2) as usize);
+            let mut lines = vec![
+                Line::from(vec![
+                    Span::styled("📝 Context: ", Style::default().fg(self.theme.palette.info)),
+                ])
+            ];
+            for line in context_lines.iter().take(2) {
+                lines.push(Line::from(vec![
+                    Span::raw("   "),
+                    Span::styled(line.to_string(), Style::default().fg(self.theme.palette.fg_dim)),
+                ]));
+            }
+            frame.render_widget(Paragraph::new(lines), sections[1]);
+        }
+
+        // Separator
+        let separator = Line::styled(
+            "─".repeat(sections[2].width as usize),
+            Style::default().fg(self.theme.palette.divider_fg),
+        );
+        frame.render_widget(Paragraph::new(separator), sections[2]);
+
+        // Options with icons and colors
+        let options = [
+            ("✓", " [a] Allow once", self.theme.palette.success, 0),
+            ("✓✓", " [A] Always allow", self.theme.palette.primary, 1),
+            ("✗", " [d] Deny", self.theme.palette.error, 2),
+            ("?", " [?] Explain", self.theme.palette.info, 3),
+        ];
+
+        for (icon, text, color, idx) in options.iter() {
+            let (style, prefix) = if self.selected == *idx {
+                (
+                    self.theme.selected,
+                    "▶ "
+                )
+            } else {
+                (
+                    Style::default().fg(*color),
+                    "  "
+                )
+            };
+
+            let line = Line::from(vec![
+                Span::styled(prefix, style),
+                Span::styled(*icon, style),
+                Span::styled(*text, style),
+            ]);
+            frame.render_widget(Paragraph::new(line), sections[3 + idx]);
+        }
+
+        // Help text at bottom
+        let help_line = Line::from(vec![
+            Span::styled(
+                "↑↓ Navigate  Enter to select  Esc to deny",
+                Style::default().fg(self.theme.palette.fg_dim).add_modifier(Modifier::ITALIC),
+            ),
+        ]);
+        frame.render_widget(Paragraph::new(help_line), sections[7]);
+    }
+}
+
+impl PermissionOption {
+    pub fn to_decision(&self) -> Option<PermissionDecision> {
+        match self {
+            PermissionOption::AllowOnce => Some(PermissionDecision::Allow),
+            PermissionOption::AlwaysAllow => Some(PermissionDecision::Allow),
+            PermissionOption::Deny => Some(PermissionDecision::Deny),
+            PermissionOption::Explain => None, // Special handling needed
+        }
+    }
+
+    pub fn should_persist(&self) -> bool {
+        matches!(self, PermissionOption::AlwaysAllow)
+    }
+}

crates/app/ui/src/components/plan_panel.rs

@@ -0,0 +1,337 @@
+//! Plan panel component for displaying accumulated plan steps
+//!
+//! Shows the current plan with steps, approval status, and keybindings.
+
+use ratatui::{
+    layout::Rect,
+    style::{Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Scrollbar, ScrollbarOrientation, ScrollbarState},
+    Frame,
+};
+use tools_plan::{AccumulatedPlan, AccumulatedPlanStatus, PlanStep};
+
+use crate::theme::Theme;
+
+/// Plan panel component for displaying and interacting with accumulated plans
+pub struct PlanPanel {
+    theme: Theme,
+    /// Currently selected step index
+    selected: usize,
+    /// Scroll offset for long lists
+    scroll_offset: usize,
+    /// Whether the panel is visible
+    visible: bool,
+}
+
+impl PlanPanel {
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            theme,
+            selected: 0,
+            scroll_offset: 0,
+            visible: false,
+        }
+    }
+
+    /// Show the panel
+    pub fn show(&mut self) {
+        self.visible = true;
+        self.selected = 0;
+        self.scroll_offset = 0;
+    }
+
+    /// Hide the panel
+    pub fn hide(&mut self) {
+        self.visible = false;
+    }
+
+    /// Check if visible
+    pub fn is_visible(&self) -> bool {
+        self.visible
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Move selection up
+    pub fn select_prev(&mut self) {
+        if self.selected > 0 {
+            self.selected -= 1;
+            // Adjust scroll if needed
+            if self.selected < self.scroll_offset {
+                self.scroll_offset = self.selected;
+            }
+        }
+    }
+
+    /// Move selection down
+    pub fn select_next(&mut self, total_steps: usize) {
+        if self.selected < total_steps.saturating_sub(1) {
+            self.selected += 1;
+        }
+    }
+
+    /// Get the currently selected step index
+    pub fn selected_index(&self) -> usize {
+        self.selected
+    }
+
+    /// Reset selection to first step
+    pub fn reset_selection(&mut self) {
+        self.selected = 0;
+        self.scroll_offset = 0;
+    }
+
+    /// Get the minimum height needed for the panel
+    pub fn min_height(&self) -> u16 {
+        if self.visible { 10 } else { 0 }
+    }
+
+    /// Render the plan panel
+    pub fn render(&self, frame: &mut Frame, area: Rect, plan: Option<&AccumulatedPlan>) {
+        if !self.visible {
+            return;
+        }
+
+        let plan = match plan {
+            Some(p) => p,
+            None => {
+                // Show "no plan" message
+                let block = Block::default()
+                    .borders(Borders::ALL)
+                    .title(" PLAN ")
+                    .border_style(self.theme.border);
+                let paragraph = Paragraph::new("No active plan")
+                    .style(self.theme.status_dim)
+                    .block(block);
+                frame.render_widget(paragraph, area);
+                return;
+            }
+        };
+
+        let mut lines: Vec<Line> = Vec::new();
+
+        // Title line with status
+        let status_str = match &plan.status {
+            AccumulatedPlanStatus::Accumulating => "Accumulating".to_string(),
+            AccumulatedPlanStatus::Reviewing => "Reviewing".to_string(),
+            AccumulatedPlanStatus::Executing => "Executing".to_string(),
+            AccumulatedPlanStatus::ExecutingParallel { active_count, remaining } => {
+                format!("Executing ({} active, {} left)", active_count, remaining)
+            }
+            AccumulatedPlanStatus::Paused(reason) => {
+                match reason {
+                    tools_plan::PauseReason::StepFailed { .. } => "Paused (Step Failed)".to_string(),
+                    tools_plan::PauseReason::AwaitingPermission { .. } => "Paused (Permission)".to_string(),
+                }
+            }
+            AccumulatedPlanStatus::Completed => "Completed".to_string(),
+            AccumulatedPlanStatus::Cancelled => "Cancelled".to_string(),
+            AccumulatedPlanStatus::Aborted { reason } => format!("Aborted: {}", reason),
+        };
+        let status_color = match &plan.status {
+            AccumulatedPlanStatus::Accumulating => self.theme.palette.warning,
+            AccumulatedPlanStatus::Reviewing => self.theme.palette.info,
+            AccumulatedPlanStatus::Executing | AccumulatedPlanStatus::ExecutingParallel { .. } => {
+                self.theme.palette.success
+            }
+            AccumulatedPlanStatus::Paused(_) => self.theme.palette.warning,
+            AccumulatedPlanStatus::Completed => self.theme.palette.success,
+            AccumulatedPlanStatus::Cancelled | AccumulatedPlanStatus::Aborted { .. } => {
+                self.theme.palette.error
+            }
+        };
+
+        let name = plan.name.as_deref().unwrap_or("unnamed");
+        lines.push(Line::from(vec![
+            Span::styled(
+                format!(" {} ", name),
+                Style::default().add_modifier(Modifier::BOLD),
+            ),
+            Span::styled(" | ", self.theme.status_dim),
+            Span::styled(status_str, Style::default().fg(status_color)),
+            Span::styled(
+                format!(" ({} steps)", plan.steps.len()),
+                self.theme.status_dim,
+            ),
+        ]));
+
+        // Separator
+        lines.push(Line::from("─".repeat(area.width.saturating_sub(2) as usize)));
+
+        // Steps
+        if plan.steps.is_empty() {
+            lines.push(Line::from(Span::styled(
+                " No steps yet...",
+                self.theme.status_dim,
+            )));
+        } else {
+            let visible_height = area.height.saturating_sub(6) as usize; // Account for header, footer, borders
+            let start = self.scroll_offset;
+            let end = (start + visible_height).min(plan.steps.len());
+
+            for (idx, step) in plan.steps.iter().enumerate().skip(start).take(end - start) {
+                let is_selected = idx == self.selected;
+                let line = self.render_step(step, idx + 1, is_selected);
+                lines.push(line);
+
+                // Show rationale if selected and available
+                if is_selected {
+                    if let Some(rationale) = &step.rationale {
+                        let truncated = if rationale.len() > 60 {
+                            format!("{}...", &rationale[..57])
+                        } else {
+                            rationale.clone()
+                        };
+                        lines.push(Line::from(vec![
+                            Span::raw("     "),
+                            Span::styled(
+                                format!("\"{}\"", truncated),
+                                Style::default().fg(self.theme.palette.fg_dim).add_modifier(Modifier::ITALIC),
+                            ),
+                        ]));
+                    }
+                }
+            }
+        }
+
+        // Footer with keybindings
+        lines.push(Line::from("─".repeat(area.width.saturating_sub(2) as usize)));
+
+        let keybinds = match plan.status {
+            AccumulatedPlanStatus::Accumulating => {
+                "[F]inalize  [C]ancel"
+            }
+            AccumulatedPlanStatus::Reviewing => {
+                "[j/k]nav [Space]toggle [A]pprove all [R]eject all [Enter]execute [S]ave [C]ancel"
+            }
+            _ => "[C]lose",
+        };
+        lines.push(Line::from(Span::styled(keybinds, self.theme.status_dim)));
+
+        // Create block with border
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .title(" PLAN ")
+            .border_style(self.theme.border);
+
+        let paragraph = Paragraph::new(lines).block(block);
+        frame.render_widget(paragraph, area);
+
+        // Scrollbar if needed
+        if plan.steps.len() > (area.height.saturating_sub(6) as usize) {
+            let scrollbar = Scrollbar::new(ScrollbarOrientation::VerticalRight)
+                .begin_symbol(Some("↑"))
+                .end_symbol(Some("↓"));
+            let mut scrollbar_state = ScrollbarState::new(plan.steps.len())
+                .position(self.selected);
+            frame.render_stateful_widget(
+                scrollbar,
+                area.inner(ratatui::layout::Margin { vertical: 2, horizontal: 0 }),
+                &mut scrollbar_state,
+            );
+        }
+    }
+
+    /// Render a single step line
+    fn render_step(&self, step: &PlanStep, num: usize, selected: bool) -> Line<'static> {
+        let checkbox = match step.approved {
+            None => "☐",      // Pending
+            Some(true) => "☑", // Approved
+            Some(false) => "☒", // Rejected
+        };
+
+        let checkbox_color = match step.approved {
+            None => self.theme.palette.warning,
+            Some(true) => self.theme.palette.success,
+            Some(false) => self.theme.palette.error,
+        };
+
+        // Truncate args for display
+        let args_str = step.args.to_string();
+        let args_display = if args_str.len() > 40 {
+            format!("{}...", &args_str[..37])
+        } else {
+            args_str
+        };
+
+        let mut spans = vec![
+            Span::styled(
+                if selected { ">" } else { " " },
+                Style::default().add_modifier(Modifier::BOLD),
+            ),
+            Span::styled(format!("[{}] ", num), self.theme.status_dim),
+            Span::styled(checkbox, Style::default().fg(checkbox_color)),
+            Span::raw(" "),
+            Span::styled(
+                format!("{:<10}", step.tool),
+                Style::default().add_modifier(Modifier::BOLD),
+            ),
+            Span::styled(args_display, self.theme.status_dim),
+        ];
+
+        if selected {
+            // Highlight the entire line for selected step
+            for span in &mut spans {
+                span.style = span.style.add_modifier(Modifier::REVERSED);
+            }
+        }
+
+        Line::from(spans)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::theme::Theme;
+
+    #[test]
+    fn test_plan_panel_creation() {
+        let theme = Theme::default();
+        let panel = PlanPanel::new(theme);
+        assert!(!panel.is_visible());
+        assert_eq!(panel.selected_index(), 0);
+    }
+
+    #[test]
+    fn test_plan_panel_navigation() {
+        let theme = Theme::default();
+        let mut panel = PlanPanel::new(theme);
+        panel.show();
+
+        // Can't go below 0
+        panel.select_prev();
+        assert_eq!(panel.selected_index(), 0);
+
+        // Navigate down
+        panel.select_next(5);
+        assert_eq!(panel.selected_index(), 1);
+        panel.select_next(5);
+        assert_eq!(panel.selected_index(), 2);
+
+        // Can't go past end
+        panel.select_next(3);
+        panel.select_next(3);
+        assert_eq!(panel.selected_index(), 2);
+
+        // Navigate back up
+        panel.select_prev();
+        assert_eq!(panel.selected_index(), 1);
+    }
+
+    #[test]
+    fn test_plan_panel_visibility() {
+        let theme = Theme::default();
+        let mut panel = PlanPanel::new(theme);
+
+        assert!(!panel.is_visible());
+        panel.show();
+        assert!(panel.is_visible());
+        panel.hide();
+        assert!(!panel.is_visible());
+    }
+}

crates/app/ui/src/components/provider_tabs.rs

@@ -0,0 +1,189 @@
+//! Provider tabs component for multi-LLM support
+//!
+//! Displays horizontal tabs for switching between providers (Claude, Ollama, OpenAI)
+//! with icons and keybind hints.
+
+use crate::theme::{Provider, Theme};
+use ratatui::{
+    layout::Rect,
+    style::Style,
+    text::{Line, Span},
+    widgets::Paragraph,
+    Frame,
+};
+
+/// Provider tab state and rendering
+pub struct ProviderTabs {
+    active: Provider,
+    theme: Theme,
+}
+
+impl ProviderTabs {
+    /// Create new provider tabs with default provider
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            active: Provider::Ollama, // Default to Ollama (local)
+            theme,
+        }
+    }
+
+    /// Create with specific active provider
+    pub fn with_provider(provider: Provider, theme: Theme) -> Self {
+        Self {
+            active: provider,
+            theme,
+        }
+    }
+
+    /// Get the currently active provider
+    pub fn active(&self) -> Provider {
+        self.active
+    }
+
+    /// Set the active provider
+    pub fn set_active(&mut self, provider: Provider) {
+        self.active = provider;
+    }
+
+    /// Cycle to the next provider
+    pub fn next(&mut self) {
+        self.active = match self.active {
+            Provider::Claude => Provider::Ollama,
+            Provider::Ollama => Provider::OpenAI,
+            Provider::OpenAI => Provider::Claude,
+        };
+    }
+
+    /// Cycle to the previous provider
+    pub fn previous(&mut self) {
+        self.active = match self.active {
+            Provider::Claude => Provider::OpenAI,
+            Provider::Ollama => Provider::Claude,
+            Provider::OpenAI => Provider::Ollama,
+        };
+    }
+
+    /// Select provider by number (1, 2, 3)
+    pub fn select_by_number(&mut self, num: u8) {
+        self.active = match num {
+            1 => Provider::Claude,
+            2 => Provider::Ollama,
+            3 => Provider::OpenAI,
+            _ => self.active,
+        };
+    }
+
+    /// Update the theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Render the provider tabs (borderless)
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        let mut spans = Vec::new();
+
+        // Add spacing at start
+        spans.push(Span::raw("  "));
+
+        for (i, provider) in Provider::all().iter().enumerate() {
+            let is_active = *provider == self.active;
+            let icon = self.theme.provider_icon(*provider);
+            let name = provider.name();
+            let number = (i + 1).to_string();
+
+            // Keybind hint
+            spans.push(Span::styled(
+                format!("[{}] ", number),
+                self.theme.status_dim,
+            ));
+
+            // Icon and name
+            let style = if is_active {
+                Style::default()
+                    .fg(self.theme.provider_color(*provider))
+                    .add_modifier(ratatui::style::Modifier::BOLD)
+            } else {
+                self.theme.tab_inactive
+            };
+
+            spans.push(Span::styled(format!("{} ", icon), style));
+            spans.push(Span::styled(name.to_string(), style));
+
+            // Separator between tabs (not after last)
+            if i < Provider::all().len() - 1 {
+                spans.push(Span::styled(
+                    format!("  {}  ", self.theme.symbols.vertical_separator),
+                    self.theme.status_dim,
+                ));
+            }
+        }
+
+        // Tab cycling hint on the right
+        spans.push(Span::raw("  "));
+        spans.push(Span::styled("[Tab] cycle", self.theme.status_dim));
+
+        let line = Line::from(spans);
+        let paragraph = Paragraph::new(line);
+        frame.render_widget(paragraph, area);
+    }
+
+    /// Render a compact version (just active provider)
+    pub fn render_compact(&self, frame: &mut Frame, area: Rect) {
+        let icon = self.theme.provider_icon(self.active);
+        let name = self.active.name();
+
+        let line = Line::from(vec![
+            Span::raw("  "),
+            Span::styled(
+                format!("{} {}", icon, name),
+                Style::default()
+                    .fg(self.theme.provider_color(self.active))
+                    .add_modifier(ratatui::style::Modifier::BOLD),
+            ),
+        ]);
+
+        let paragraph = Paragraph::new(line);
+        frame.render_widget(paragraph, area);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_provider_cycling() {
+        let theme = Theme::default();
+        let mut tabs = ProviderTabs::new(theme);
+
+        assert_eq!(tabs.active(), Provider::Ollama);
+
+        tabs.next();
+        assert_eq!(tabs.active(), Provider::OpenAI);
+
+        tabs.next();
+        assert_eq!(tabs.active(), Provider::Claude);
+
+        tabs.next();
+        assert_eq!(tabs.active(), Provider::Ollama);
+    }
+
+    #[test]
+    fn test_select_by_number() {
+        let theme = Theme::default();
+        let mut tabs = ProviderTabs::new(theme);
+
+        tabs.select_by_number(1);
+        assert_eq!(tabs.active(), Provider::Claude);
+
+        tabs.select_by_number(2);
+        assert_eq!(tabs.active(), Provider::Ollama);
+
+        tabs.select_by_number(3);
+        assert_eq!(tabs.active(), Provider::OpenAI);
+
+        // Invalid number should not change
+        tabs.select_by_number(4);
+        assert_eq!(tabs.active(), Provider::OpenAI);
+    }
+}

crates/app/ui/src/components/status_bar.rs

@@ -0,0 +1,208 @@
+//! Minimal status bar component
+//!
+//! Clean, readable status bar with essential info only.
+//! Format: ` Mode │ N msgs │ ~Nk tok │ state`
+
+use crate::theme::{Provider, Theme, VimMode};
+use agent_core::SessionStats;
+use permissions::Mode;
+use ratatui::{
+    layout::Rect,
+    style::{Style, Stylize},
+    text::{Line, Span},
+    widgets::Paragraph,
+    Frame,
+};
+
+/// Application state for status display
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum AppState {
+    Idle,
+    Streaming,
+    WaitingPermission,
+    Error,
+}
+
+impl AppState {
+    pub fn label(&self) -> &'static str {
+        match self {
+            AppState::Idle => "idle",
+            AppState::Streaming => "streaming...",
+            AppState::WaitingPermission => "waiting",
+            AppState::Error => "error",
+        }
+    }
+}
+
+pub struct StatusBar {
+    provider: Provider,
+    model: String,
+    mode: Mode,
+    vim_mode: VimMode,
+    stats: SessionStats,
+    last_tool: Option<String>,
+    state: AppState,
+    estimated_cost: f64,
+    planning_mode: bool,
+    theme: Theme,
+    pending_permission: Option<String>,
+}
+
+impl StatusBar {
+    pub fn new(model: String, mode: Mode, theme: Theme) -> Self {
+        Self {
+            provider: Provider::Ollama, // Default provider
+            model,
+            mode,
+            vim_mode: VimMode::Insert,
+            stats: SessionStats::new(),
+            last_tool: None,
+            state: AppState::Idle,
+            estimated_cost: 0.0,
+            planning_mode: false,
+            theme,
+            pending_permission: None,
+        }
+    }
+
+    /// Set pending permission tool name
+    pub fn set_pending_permission(&mut self, tool: Option<String>) {
+        self.pending_permission = tool;
+    }
+
+    /// Set the active provider
+    pub fn set_provider(&mut self, provider: Provider) {
+        self.provider = provider;
+    }
+
+    /// Set the current model
+    pub fn set_model(&mut self, model: String) {
+        self.model = model;
+    }
+
+    /// Update session stats
+    pub fn update_stats(&mut self, stats: SessionStats) {
+        self.stats = stats;
+    }
+
+    /// Set the last used tool
+    pub fn set_last_tool(&mut self, tool: String) {
+        self.last_tool = Some(tool);
+    }
+
+    /// Set application state
+    pub fn set_state(&mut self, state: AppState) {
+        self.state = state;
+    }
+
+    /// Set vim mode for display
+    pub fn set_vim_mode(&mut self, mode: VimMode) {
+        self.vim_mode = mode;
+    }
+
+    /// Add to estimated cost
+    pub fn add_cost(&mut self, cost: f64) {
+        self.estimated_cost += cost;
+    }
+
+    /// Reset cost
+    pub fn reset_cost(&mut self) {
+        self.estimated_cost = 0.0;
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Set planning mode status
+    pub fn set_planning_mode(&mut self, active: bool) {
+        self.planning_mode = active;
+    }
+
+    /// Render the minimal status bar
+    ///
+    /// Format: ` Mode │ N msgs │ ~Nk tok │ state`
+    pub fn render(&self, frame: &mut Frame, area: Rect) {
+        let sep = self.theme.symbols.vertical_separator;
+        let sep_style = Style::default().fg(self.theme.palette.border);
+
+        // If waiting for permission, show prompt instead of normal status
+        if let (AppState::WaitingPermission, Some(tool)) = (self.state, &self.pending_permission) {
+            let prompt_spans = vec![
+                Span::styled(" ALLOW TOOL: ", self.theme.status_dim),
+                Span::styled(tool, Style::default().fg(self.theme.palette.warning).bold()),
+                Span::styled("? (y/n/a/e) ", self.theme.status_dim),
+            ];
+            let line = Line::from(prompt_spans);
+            let paragraph = Paragraph::new(line);
+            frame.render_widget(paragraph, area);
+            return;
+        }
+
+        // Permission mode
+        let mode_str = if self.planning_mode {
+            "PLAN"
+        } else {
+            match self.mode {
+                Mode::Plan => "Plan",
+                Mode::AcceptEdits => "Edit",
+                Mode::Code => "Code",
+            }
+        };
+
+        // Format token count
+        let tokens_str = if self.stats.estimated_tokens >= 1000 {
+            format!("~{}k tok", self.stats.estimated_tokens / 1000)
+        } else {
+            format!("~{} tok", self.stats.estimated_tokens)
+        };
+
+        // State style - only highlight non-idle states
+        let state_style = match self.state {
+            AppState::Idle => self.theme.status_dim,
+            AppState::Streaming => Style::default().fg(self.theme.palette.success),
+            AppState::WaitingPermission => Style::default().fg(self.theme.palette.warning),
+            AppState::Error => Style::default().fg(self.theme.palette.error),
+        };
+
+        // Build minimal status line
+        let spans = vec![
+            Span::styled(" ", self.theme.status_dim),
+            // Mode
+            Span::styled(mode_str, self.theme.status_dim),
+            Span::styled(format!(" {} ", sep), sep_style),
+            // Message count
+            Span::styled(format!("{} msgs", self.stats.total_messages), self.theme.status_dim),
+            Span::styled(format!(" {} ", sep), sep_style),
+            // Token count
+            Span::styled(&tokens_str, self.theme.status_dim),
+            Span::styled(format!(" {} ", sep), sep_style),
+            // State
+            Span::styled(self.state.label(), state_style),
+        ];
+
+        let line = Line::from(spans);
+        let paragraph = Paragraph::new(line);
+        frame.render_widget(paragraph, area);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_status_bar_creation() {
+        let theme = Theme::default();
+        let status_bar = StatusBar::new("gpt-4".to_string(), Mode::Plan, theme);
+        assert_eq!(status_bar.model, "gpt-4");
+    }
+
+    #[test]
+    fn test_app_state_display() {
+        assert_eq!(AppState::Idle.label(), "idle");
+        assert_eq!(AppState::Streaming.label(), "streaming...");
+        assert_eq!(AppState::Error.label(), "error");
+    }
+}

crates/app/ui/src/components/todo_panel.rs

@@ -0,0 +1,200 @@
+//! Todo panel component for displaying task list
+//!
+//! Shows the current todo list with status indicators and progress.
+
+use ratatui::{
+    layout::Rect,
+    style::{Color, Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph},
+    Frame,
+};
+use tools_todo::{Todo, TodoList, TodoStatus};
+
+use crate::theme::Theme;
+
+/// Todo panel component
+pub struct TodoPanel {
+    theme: Theme,
+    collapsed: bool,
+}
+
+impl TodoPanel {
+    pub fn new(theme: Theme) -> Self {
+        Self {
+            theme,
+            collapsed: false,
+        }
+    }
+
+    /// Toggle collapsed state
+    pub fn toggle(&mut self) {
+        self.collapsed = !self.collapsed;
+    }
+
+    /// Check if collapsed
+    pub fn is_collapsed(&self) -> bool {
+        self.collapsed
+    }
+
+    /// Update theme
+    pub fn set_theme(&mut self, theme: Theme) {
+        self.theme = theme;
+    }
+
+    /// Get the minimum height needed for the panel
+    pub fn min_height(&self) -> u16 {
+        if self.collapsed {
+            1
+        } else {
+            5
+        }
+    }
+
+    /// Render the todo panel
+    pub fn render(&self, frame: &mut Frame, area: Rect, todos: &TodoList) {
+        if self.collapsed {
+            self.render_collapsed(frame, area, todos);
+        } else {
+            self.render_expanded(frame, area, todos);
+        }
+    }
+
+    /// Render collapsed view (single line summary)
+    fn render_collapsed(&self, frame: &mut Frame, area: Rect, todos: &TodoList) {
+        let items = todos.read();
+        let completed = items.iter().filter(|t| t.status == TodoStatus::Completed).count();
+        let in_progress = items.iter().filter(|t| t.status == TodoStatus::InProgress).count();
+        let pending = items.iter().filter(|t| t.status == TodoStatus::Pending).count();
+
+        let summary = if items.is_empty() {
+            "No tasks".to_string()
+        } else {
+            format!(
+                "{} {} / {} {} / {} {}",
+                self.theme.symbols.check, completed,
+                self.theme.symbols.streaming, in_progress,
+                self.theme.symbols.bullet, pending
+            )
+        };
+
+        let line = Line::from(vec![
+            Span::styled("Tasks: ", self.theme.status_bar),
+            Span::styled(summary, self.theme.status_dim),
+            Span::styled(" [t to expand]", self.theme.status_dim),
+        ]);
+
+        let paragraph = Paragraph::new(line);
+        frame.render_widget(paragraph, area);
+    }
+
+    /// Render expanded view with task list
+    fn render_expanded(&self, frame: &mut Frame, area: Rect, todos: &TodoList) {
+        let items = todos.read();
+
+        let mut lines: Vec<Line> = Vec::new();
+
+        // Header
+        lines.push(Line::from(vec![
+            Span::styled("Tasks", Style::default().add_modifier(Modifier::BOLD)),
+            Span::styled(" [t to collapse]", self.theme.status_dim),
+        ]));
+
+        if items.is_empty() {
+            lines.push(Line::from(Span::styled(
+                "  No active tasks",
+                self.theme.status_dim,
+            )));
+        } else {
+            // Show tasks (limit to available space)
+            let max_items = (area.height as usize).saturating_sub(2);
+            let display_items: Vec<&Todo> = items.iter().take(max_items).collect();
+
+            for item in display_items {
+                let (icon, style) = match item.status {
+                    TodoStatus::Completed => (
+                        self.theme.symbols.check,
+                        Style::default().fg(Color::Green),
+                    ),
+                    TodoStatus::InProgress => (
+                        self.theme.symbols.streaming,
+                        Style::default().fg(Color::Yellow),
+                    ),
+                    TodoStatus::Pending => (
+                        self.theme.symbols.bullet,
+                        self.theme.status_dim,
+                    ),
+                };
+
+                // Use active form for in-progress, content for others
+                let text = if item.status == TodoStatus::InProgress {
+                    &item.active_form
+                } else {
+                    &item.content
+                };
+
+                // Truncate if too long
+                let max_width = area.width.saturating_sub(6) as usize;
+                let display_text = if text.len() > max_width {
+                    format!("{}...", &text[..max_width.saturating_sub(3)])
+                } else {
+                    text.clone()
+                };
+
+                lines.push(Line::from(vec![
+                    Span::styled(format!("  {} ", icon), style),
+                    Span::styled(display_text, style),
+                ]));
+            }
+
+            // Show overflow indicator if needed
+            if items.len() > max_items {
+                lines.push(Line::from(Span::styled(
+                    format!("  ... and {} more", items.len() - max_items),
+                    self.theme.status_dim,
+                )));
+            }
+        }
+
+        let block = Block::default()
+            .borders(Borders::TOP)
+            .border_style(self.theme.status_dim);
+
+        let paragraph = Paragraph::new(lines).block(block);
+        frame.render_widget(paragraph, area);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_todo_panel_creation() {
+        let theme = Theme::default();
+        let panel = TodoPanel::new(theme);
+        assert!(!panel.is_collapsed());
+    }
+
+    #[test]
+    fn test_todo_panel_toggle() {
+        let theme = Theme::default();
+        let mut panel = TodoPanel::new(theme);
+
+        assert!(!panel.is_collapsed());
+        panel.toggle();
+        assert!(panel.is_collapsed());
+        panel.toggle();
+        assert!(!panel.is_collapsed());
+    }
+
+    #[test]
+    fn test_min_height() {
+        let theme = Theme::default();
+        let mut panel = TodoPanel::new(theme);
+
+        assert_eq!(panel.min_height(), 5);
+        panel.toggle();
+        assert_eq!(panel.min_height(), 1);
+    }
+}

crates/app/ui/src/events.rs

@@ -0,0 +1,62 @@
+use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use llm_core::ProviderType;
+use serde_json::Value;
+
+/// Application events that drive the TUI
+#[derive(Debug, Clone)]
+pub enum AppEvent {
+    /// User input from keyboard
+    Input(KeyEvent),
+    /// User submitted a message
+    UserMessage(String),
+    /// LLM streaming started
+    StreamStart,
+    /// LLM response chunk (streaming)
+    LlmChunk(String),
+    /// LLM streaming completed
+    StreamEnd { response: String },
+    /// LLM streaming error
+    StreamError(String),
+    /// Tool call started
+    ToolCall { name: String, args: Value },
+    /// Tool execution result
+    ToolResult { success: bool, output: String },
+    /// Permission request from agent
+    PermissionRequest {
+        tool: String,
+        context: Option<String>,
+    },
+    /// Session statistics updated
+    StatusUpdate(agent_core::SessionStats),
+    /// Terminal was resized
+    Resize { width: u16, height: u16 },
+    /// Mouse scroll up
+    ScrollUp,
+    /// Mouse scroll down
+    ScrollDown,
+    /// Toggle the todo panel
+    ToggleTodo,
+    /// Message from the background engine
+    EngineMessage(agent_core::messages::Message),
+    /// Switch to a specific provider
+    SwitchProvider(ProviderType),
+    /// Cycle to the next provider (Tab key)
+    CycleProvider,
+    /// Open model picker
+    OpenModelPicker,
+    /// Application should quit
+    Quit,
+}
+
+/// Process keyboard input into app events
+pub fn handle_key_event(key: KeyEvent) -> Option<AppEvent> {
+    match key.code {
+        KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => {
+            Some(AppEvent::Quit)
+        }
+        KeyCode::Char('t') if key.modifiers.contains(KeyModifiers::CONTROL) => {
+            Some(AppEvent::ToggleTodo)
+        }
+        _ => Some(AppEvent::Input(key)),
+    }
+}

crates/app/ui/src/formatting.rs

@@ -0,0 +1,532 @@
+//! Output formatting with markdown parsing and syntax highlighting
+//!
+//! This module provides rich text rendering for the TUI, converting markdown
+//! content into styled ratatui spans with proper syntax highlighting for code blocks.
+
+use pulldown_cmark::{CodeBlockKind, Event, Parser, Tag, TagEnd};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use syntect::easy::HighlightLines;
+use syntect::highlighting::{Theme, ThemeSet};
+use syntect::parsing::SyntaxSet;
+use syntect::util::LinesWithEndings;
+
+/// Highlighter for syntax highlighting code blocks
+pub struct SyntaxHighlighter {
+    syntax_set: SyntaxSet,
+    theme: Theme,
+}
+
+impl SyntaxHighlighter {
+    /// Create a new syntax highlighter with default theme
+    pub fn new() -> Self {
+        let syntax_set = SyntaxSet::load_defaults_newlines();
+        let theme_set = ThemeSet::load_defaults();
+        // Use a dark theme that works well in terminals
+        let theme = theme_set.themes["base16-ocean.dark"].clone();
+
+        Self { syntax_set, theme }
+    }
+
+    /// Create highlighter with a specific theme name
+    pub fn with_theme(theme_name: &str) -> Self {
+        let syntax_set = SyntaxSet::load_defaults_newlines();
+        let theme_set = ThemeSet::load_defaults();
+        let theme = theme_set
+            .themes
+            .get(theme_name)
+            .cloned()
+            .unwrap_or_else(|| theme_set.themes["base16-ocean.dark"].clone());
+
+        Self { syntax_set, theme }
+    }
+
+    /// Get available theme names
+    pub fn available_themes() -> Vec<&'static str> {
+        vec![
+            "base16-ocean.dark",
+            "base16-eighties.dark",
+            "base16-mocha.dark",
+            "base16-ocean.light",
+            "InspiredGitHub",
+            "Solarized (dark)",
+            "Solarized (light)",
+        ]
+    }
+
+    /// Highlight a code block and return styled lines
+    pub fn highlight_code(&self, code: &str, language: &str) -> Vec<Line<'static>> {
+        // Find syntax for the language
+        let syntax = self
+            .syntax_set
+            .find_syntax_by_token(language)
+            .or_else(|| self.syntax_set.find_syntax_by_extension(language))
+            .unwrap_or_else(|| self.syntax_set.find_syntax_plain_text());
+
+        let mut highlighter = HighlightLines::new(syntax, &self.theme);
+        let mut lines = Vec::new();
+
+        for line in LinesWithEndings::from(code) {
+            let Ok(ranges) = highlighter.highlight_line(line, &self.syntax_set) else {
+                // Fallback to plain text if highlighting fails
+                lines.push(Line::from(Span::raw(line.trim_end().to_string())));
+                continue;
+            };
+
+            let spans: Vec<Span<'static>> = ranges
+                .into_iter()
+                .map(|(style, text)| {
+                    let fg = syntect_to_ratatui_color(style.foreground);
+                    let ratatui_style = Style::default().fg(fg);
+                    Span::styled(text.trim_end_matches('\n').to_string(), ratatui_style)
+                })
+                .collect();
+
+            lines.push(Line::from(spans));
+        }
+
+        lines
+    }
+}
+
+impl Default for SyntaxHighlighter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Convert syntect color to ratatui color
+fn syntect_to_ratatui_color(color: syntect::highlighting::Color) -> Color {
+    Color::Rgb(color.r, color.g, color.b)
+}
+
+/// Parsed markdown content ready for rendering
+#[derive(Debug, Clone)]
+pub struct FormattedContent {
+    pub lines: Vec<Line<'static>>,
+}
+
+impl FormattedContent {
+    /// Create empty formatted content
+    pub fn empty() -> Self {
+        Self { lines: Vec::new() }
+    }
+
+    /// Get the number of lines
+    pub fn len(&self) -> usize {
+        self.lines.len()
+    }
+
+    /// Check if content is empty
+    pub fn is_empty(&self) -> bool {
+        self.lines.is_empty()
+    }
+}
+
+/// Markdown parser that converts markdown to styled ratatui lines
+pub struct MarkdownRenderer {
+    highlighter: SyntaxHighlighter,
+}
+
+impl MarkdownRenderer {
+    /// Create a new markdown renderer
+    pub fn new() -> Self {
+        Self {
+            highlighter: SyntaxHighlighter::new(),
+        }
+    }
+
+    /// Create renderer with custom highlighter
+    pub fn with_highlighter(highlighter: SyntaxHighlighter) -> Self {
+        Self { highlighter }
+    }
+
+    /// Render markdown text to formatted content
+    pub fn render(&self, markdown: &str) -> FormattedContent {
+        let parser = Parser::new(markdown);
+        let mut lines: Vec<Line<'static>> = Vec::new();
+        let mut current_line_spans: Vec<Span<'static>> = Vec::new();
+
+        // State tracking
+        let mut in_code_block = false;
+        let mut code_block_lang = String::new();
+        let mut code_block_content = String::new();
+        let mut current_style = Style::default();
+        let mut list_depth: usize = 0;
+        let mut ordered_list_index: Option<u64> = None;
+
+        for event in parser {
+            match event {
+                Event::Start(tag) => match tag {
+                    Tag::Heading { level, .. } => {
+                        // Flush current line
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                        // Style for headings
+                        current_style = match level {
+                            pulldown_cmark::HeadingLevel::H1 => Style::default()
+                                .fg(Color::Cyan)
+                                .add_modifier(Modifier::BOLD),
+                            pulldown_cmark::HeadingLevel::H2 => Style::default()
+                                .fg(Color::Blue)
+                                .add_modifier(Modifier::BOLD),
+                            pulldown_cmark::HeadingLevel::H3 => Style::default()
+                                .fg(Color::Green)
+                                .add_modifier(Modifier::BOLD),
+                            _ => Style::default().add_modifier(Modifier::BOLD),
+                        };
+                        // Add heading prefix
+                        let prefix = "#".repeat(level as usize);
+                        current_line_spans.push(Span::styled(
+                            format!("{} ", prefix),
+                            Style::default().fg(Color::DarkGray),
+                        ));
+                    }
+                    Tag::Paragraph => {
+                        // Start a new paragraph
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                    }
+                    Tag::CodeBlock(kind) => {
+                        in_code_block = true;
+                        code_block_content.clear();
+                        code_block_lang = match kind {
+                            CodeBlockKind::Fenced(lang) => lang.to_string(),
+                            CodeBlockKind::Indented => String::new(),
+                        };
+                        // Flush current line and add code block header
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                        // Add code fence line
+                        let fence_line = if code_block_lang.is_empty() {
+                            "```".to_string()
+                        } else {
+                            format!("```{}", code_block_lang)
+                        };
+                        lines.push(Line::from(Span::styled(
+                            fence_line,
+                            Style::default().fg(Color::DarkGray),
+                        )));
+                    }
+                    Tag::List(start) => {
+                        list_depth += 1;
+                        ordered_list_index = start;
+                    }
+                    Tag::Item => {
+                        // Flush current line
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                        // Add list marker
+                        let indent = "  ".repeat(list_depth.saturating_sub(1));
+                        let marker = if let Some(idx) = ordered_list_index {
+                            ordered_list_index = Some(idx + 1);
+                            format!("{}{}. ", indent, idx)
+                        } else {
+                            format!("{}- ", indent)
+                        };
+                        current_line_spans.push(Span::styled(
+                            marker,
+                            Style::default().fg(Color::Yellow),
+                        ));
+                    }
+                    Tag::Emphasis => {
+                        current_style = current_style.add_modifier(Modifier::ITALIC);
+                    }
+                    Tag::Strong => {
+                        current_style = current_style.add_modifier(Modifier::BOLD);
+                    }
+                    Tag::Strikethrough => {
+                        current_style = current_style.add_modifier(Modifier::CROSSED_OUT);
+                    }
+                    Tag::Link { dest_url, .. } => {
+                        current_style = Style::default()
+                            .fg(Color::Blue)
+                            .add_modifier(Modifier::UNDERLINED);
+                        // Store URL for later
+                        current_line_spans.push(Span::styled(
+                            "[",
+                            Style::default().fg(Color::DarkGray),
+                        ));
+                        // URL will be shown after link text
+                        code_block_content = dest_url.to_string();
+                    }
+                    Tag::BlockQuote(_) => {
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                        current_line_spans.push(Span::styled(
+                            "│ ",
+                            Style::default().fg(Color::DarkGray),
+                        ));
+                        current_style = Style::default().fg(Color::Gray).add_modifier(Modifier::ITALIC);
+                    }
+                    _ => {}
+                },
+                Event::End(tag_end) => match tag_end {
+                    TagEnd::Heading(_) => {
+                        current_style = Style::default();
+                        lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                    }
+                    TagEnd::Paragraph => {
+                        lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        lines.push(Line::from("")); // Empty line after paragraph
+                    }
+                    TagEnd::CodeBlock => {
+                        in_code_block = false;
+                        // Highlight and add code content
+                        let highlighted =
+                            self.highlighter.highlight_code(&code_block_content, &code_block_lang);
+                        lines.extend(highlighted);
+                        // Add closing fence
+                        lines.push(Line::from(Span::styled(
+                            "```",
+                            Style::default().fg(Color::DarkGray),
+                        )));
+                        code_block_content.clear();
+                        code_block_lang.clear();
+                    }
+                    TagEnd::List(_) => {
+                        list_depth = list_depth.saturating_sub(1);
+                        if list_depth == 0 {
+                            ordered_list_index = None;
+                        }
+                    }
+                    TagEnd::Item => {
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                    }
+                    TagEnd::Emphasis | TagEnd::Strong | TagEnd::Strikethrough => {
+                        current_style = Style::default();
+                    }
+                    TagEnd::Link => {
+                        current_line_spans.push(Span::styled(
+                            "]",
+                            Style::default().fg(Color::DarkGray),
+                        ));
+                        current_line_spans.push(Span::styled(
+                            format!("({})", code_block_content),
+                            Style::default().fg(Color::DarkGray),
+                        ));
+                        code_block_content.clear();
+                        current_style = Style::default();
+                    }
+                    TagEnd::BlockQuote => {
+                        current_style = Style::default();
+                        if !current_line_spans.is_empty() {
+                            lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                        }
+                    }
+                    _ => {}
+                },
+                Event::Text(text) => {
+                    if in_code_block {
+                        code_block_content.push_str(&text);
+                    } else {
+                        current_line_spans.push(Span::styled(text.to_string(), current_style));
+                    }
+                }
+                Event::Code(code) => {
+                    // Inline code
+                    current_line_spans.push(Span::styled(
+                        format!("`{}`", code),
+                        Style::default().fg(Color::Magenta),
+                    ));
+                }
+                Event::SoftBreak => {
+                    current_line_spans.push(Span::raw(" "));
+                }
+                Event::HardBreak => {
+                    lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                }
+                Event::Rule => {
+                    if !current_line_spans.is_empty() {
+                        lines.push(Line::from(std::mem::take(&mut current_line_spans)));
+                    }
+                    lines.push(Line::from(Span::styled(
+                        "─".repeat(40),
+                        Style::default().fg(Color::DarkGray),
+                    )));
+                }
+                _ => {}
+            }
+        }
+
+        // Flush any remaining content
+        if !current_line_spans.is_empty() {
+            lines.push(Line::from(current_line_spans));
+        }
+
+        FormattedContent { lines }
+    }
+
+    /// Render plain text (no markdown parsing)
+    pub fn render_plain(&self, text: &str) -> FormattedContent {
+        let lines = text
+            .lines()
+            .map(|line| Line::from(Span::raw(line.to_string())))
+            .collect();
+        FormattedContent { lines }
+    }
+
+    /// Render a diff with +/- highlighting
+    pub fn render_diff(&self, diff: &str) -> FormattedContent {
+        let lines = diff
+            .lines()
+            .map(|line| {
+                let style = if line.starts_with('+') && !line.starts_with("+++") {
+                    Style::default().fg(Color::Green)
+                } else if line.starts_with('-') && !line.starts_with("---") {
+                    Style::default().fg(Color::Red)
+                } else if line.starts_with("@@") {
+                    Style::default().fg(Color::Cyan)
+                } else if line.starts_with("diff ") || line.starts_with("index ") {
+                    Style::default().fg(Color::Yellow)
+                } else {
+                    Style::default()
+                };
+                Line::from(Span::styled(line.to_string(), style))
+            })
+            .collect();
+        FormattedContent { lines }
+    }
+}
+
+impl Default for MarkdownRenderer {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Format a file path with syntax highlighting based on extension
+pub fn format_file_path(path: &str) -> Span<'static> {
+    let color = if path.ends_with(".rs") {
+        Color::Rgb(222, 165, 132) // Rust orange
+    } else if path.ends_with(".toml") {
+        Color::Rgb(156, 220, 254) // Light blue
+    } else if path.ends_with(".md") {
+        Color::Rgb(86, 156, 214) // Blue
+    } else if path.ends_with(".json") {
+        Color::Rgb(206, 145, 120) // Brown
+    } else if path.ends_with(".ts") || path.ends_with(".tsx") {
+        Color::Rgb(49, 120, 198) // TypeScript blue
+    } else if path.ends_with(".js") || path.ends_with(".jsx") {
+        Color::Rgb(241, 224, 90) // JavaScript yellow
+    } else if path.ends_with(".py") {
+        Color::Rgb(55, 118, 171) // Python blue
+    } else if path.ends_with(".go") {
+        Color::Rgb(0, 173, 216) // Go cyan
+    } else if path.ends_with(".sh") || path.ends_with(".bash") {
+        Color::Rgb(137, 224, 81) // Shell green
+    } else {
+        Color::White
+    };
+
+    Span::styled(path.to_string(), Style::default().fg(color))
+}
+
+/// Format a tool name with appropriate styling
+pub fn format_tool_name(name: &str) -> Span<'static> {
+    let style = Style::default()
+        .fg(Color::Yellow)
+        .add_modifier(Modifier::BOLD);
+    Span::styled(name.to_string(), style)
+}
+
+/// Format an error message
+pub fn format_error(message: &str) -> Line<'static> {
+    Line::from(vec![
+        Span::styled("Error: ", Style::default().fg(Color::Red).add_modifier(Modifier::BOLD)),
+        Span::styled(message.to_string(), Style::default().fg(Color::Red)),
+    ])
+}
+
+/// Format a success message
+pub fn format_success(message: &str) -> Line<'static> {
+    Line::from(vec![
+        Span::styled("✓ ", Style::default().fg(Color::Green)),
+        Span::styled(message.to_string(), Style::default().fg(Color::Green)),
+    ])
+}
+
+/// Format a warning message
+pub fn format_warning(message: &str) -> Line<'static> {
+    Line::from(vec![
+        Span::styled("⚠ ", Style::default().fg(Color::Yellow)),
+        Span::styled(message.to_string(), Style::default().fg(Color::Yellow)),
+    ])
+}
+
+/// Format an info message
+pub fn format_info(message: &str) -> Line<'static> {
+    Line::from(vec![
+        Span::styled("ℹ ", Style::default().fg(Color::Blue)),
+        Span::styled(message.to_string(), Style::default().fg(Color::Blue)),
+    ])
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_syntax_highlighter_creation() {
+        let highlighter = SyntaxHighlighter::new();
+        let lines = highlighter.highlight_code("fn main() {}", "rust");
+        assert!(!lines.is_empty());
+    }
+
+    #[test]
+    fn test_markdown_render_heading() {
+        let renderer = MarkdownRenderer::new();
+        let content = renderer.render("# Hello World");
+        assert!(!content.is_empty());
+    }
+
+    #[test]
+    fn test_markdown_render_code_block() {
+        let renderer = MarkdownRenderer::new();
+        let content = renderer.render("```rust\nfn main() {}\n```");
+        assert!(content.len() >= 3); // Opening fence, code, closing fence
+    }
+
+    #[test]
+    fn test_markdown_render_list() {
+        let renderer = MarkdownRenderer::new();
+        let content = renderer.render("- Item 1\n- Item 2\n- Item 3");
+        assert!(content.len() >= 3);
+    }
+
+    #[test]
+    fn test_diff_rendering() {
+        let renderer = MarkdownRenderer::new();
+        let diff = "+added line\n-removed line\n unchanged";
+        let content = renderer.render_diff(diff);
+        assert_eq!(content.len(), 3);
+    }
+
+    #[test]
+    fn test_format_file_path() {
+        let span = format_file_path("src/main.rs");
+        assert!(span.content.contains("main.rs"));
+    }
+
+    #[test]
+    fn test_format_messages() {
+        let error = format_error("Something went wrong");
+        assert!(!error.spans.is_empty());
+
+        let success = format_success("Operation completed");
+        assert!(!success.spans.is_empty());
+
+        let warning = format_warning("Be careful");
+        assert!(!warning.spans.is_empty());
+
+        let info = format_info("FYI");
+        assert!(!info.spans.is_empty());
+    }
+}

crates/app/ui/src/layout.rs

@@ -0,0 +1,225 @@
+//! Layout calculation for the borderless TUI
+//!
+//! Uses vertical layout with whitespace for visual hierarchy instead of borders:
+//! - Header row (app name, mode, model, help)
+//! - Provider tabs
+//! - Horizontal divider
+//! - Chat area (scrollable)
+//! - Horizontal divider
+//! - Input area
+//! - Status bar
+
+use ratatui::layout::{Constraint, Direction, Layout, Rect};
+
+/// Calculated layout areas for the borderless TUI
+#[derive(Debug, Clone, Copy)]
+pub struct AppLayout {
+    /// Header row: app name, mode indicator, model, help hint
+    pub header_area: Rect,
+    /// Provider tabs row
+    pub tabs_area: Rect,
+    /// Top divider (horizontal rule)
+    pub top_divider: Rect,
+    /// Main chat/message area
+    pub chat_area: Rect,
+    /// Todo panel area (optional, between chat and input)
+    pub todo_area: Rect,
+    /// Bottom divider (horizontal rule)
+    pub bottom_divider: Rect,
+    /// Input area for user text
+    pub input_area: Rect,
+    /// Status bar at the bottom
+    pub status_area: Rect,
+}
+
+impl AppLayout {
+    /// Calculate layout for the given terminal size
+    pub fn calculate(area: Rect) -> Self {
+        Self::calculate_with_todo(area, 0)
+    }
+
+    /// Calculate layout with todo panel of specified height
+    ///
+    /// Layout with provider tabs:
+    /// - Header (1 line)
+    /// - Provider tabs (1 line)
+    /// - Top divider (1 line)
+    /// - Chat area (flexible)
+    /// - Todo panel (optional)
+    /// - Bottom divider (1 line)
+    /// - Input (1 line)
+    /// - Status bar (1 line)
+    pub fn calculate_with_todo(area: Rect, todo_height: u16) -> Self {
+        let chunks = if todo_height > 0 {
+            Layout::default()
+                .direction(Direction::Vertical)
+                .constraints([
+                    Constraint::Length(1),          // Header
+                    Constraint::Length(1),          // Provider tabs
+                    Constraint::Length(1),          // Top divider
+                    Constraint::Min(5),             // Chat area (flexible)
+                    Constraint::Length(todo_height), // Todo panel
+                    Constraint::Length(1),          // Bottom divider
+                    Constraint::Length(1),          // Input
+                    Constraint::Length(1),          // Status bar
+                ])
+                .split(area)
+        } else {
+            Layout::default()
+                .direction(Direction::Vertical)
+                .constraints([
+                    Constraint::Length(1),  // Header
+                    Constraint::Length(1),  // Provider tabs
+                    Constraint::Length(1),  // Top divider
+                    Constraint::Min(5),     // Chat area (flexible)
+                    Constraint::Length(0),  // No todo panel
+                    Constraint::Length(1),  // Bottom divider
+                    Constraint::Length(1),  // Input
+                    Constraint::Length(1),  // Status bar
+                ])
+                .split(area)
+        };
+
+        Self {
+            header_area: chunks[0],
+            tabs_area: chunks[1],
+            top_divider: chunks[2],
+            chat_area: chunks[3],
+            todo_area: chunks[4],
+            bottom_divider: chunks[5],
+            input_area: chunks[6],
+            status_area: chunks[7],
+        }
+    }
+
+    /// Calculate layout with expanded input (multiline)
+    pub fn calculate_expanded_input(area: Rect, input_lines: u16) -> Self {
+        let input_height = input_lines.min(10).max(1); // Cap at 10 lines
+
+        let chunks = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Length(1),          // Header
+                Constraint::Length(1),          // Top divider
+                Constraint::Min(5),             // Chat area (flexible)
+                Constraint::Length(0),          // No todo panel
+                Constraint::Length(1),          // Bottom divider
+                Constraint::Length(input_height), // Expanded input
+                Constraint::Length(1),          // Status bar
+            ])
+            .split(area);
+
+        Self {
+            header_area: chunks[0],
+            tabs_area: Rect::default(),
+            top_divider: chunks[1],
+            chat_area: chunks[2],
+            todo_area: chunks[3],
+            bottom_divider: chunks[4],
+            input_area: chunks[5],
+            status_area: chunks[6],
+        }
+    }
+
+    /// Calculate layout without tabs (compact mode)
+    pub fn calculate_compact(area: Rect) -> Self {
+        let chunks = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Length(1),  // Header (includes compact provider indicator)
+                Constraint::Length(1),  // Top divider
+                Constraint::Min(5),     // Chat area (flexible)
+                Constraint::Length(0),  // No todo panel
+                Constraint::Length(1),  // Bottom divider
+                Constraint::Length(1),  // Input
+                Constraint::Length(1),  // Status bar
+            ])
+            .split(area);
+
+        Self {
+            header_area: chunks[0],
+            tabs_area: Rect::default(), // No tabs area in compact mode
+            top_divider: chunks[1],
+            chat_area: chunks[2],
+            todo_area: chunks[3],
+            bottom_divider: chunks[4],
+            input_area: chunks[5],
+            status_area: chunks[6],
+        }
+    }
+
+    /// Center a popup in the given area
+    pub fn center_popup(area: Rect, width: u16, height: u16) -> Rect {
+        let popup_layout = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Length((area.height.saturating_sub(height)) / 2),
+                Constraint::Length(height),
+                Constraint::Length((area.height.saturating_sub(height)) / 2),
+            ])
+            .split(area);
+
+        Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([
+                Constraint::Length((area.width.saturating_sub(width)) / 2),
+                Constraint::Length(width),
+                Constraint::Length((area.width.saturating_sub(width)) / 2),
+            ])
+            .split(popup_layout[1])[1]
+    }
+}
+
+/// Layout mode based on terminal width
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum LayoutMode {
+    /// Full layout with provider tabs (>= 80 cols)
+    Full,
+    /// Compact layout without tabs (< 80 cols)
+    Compact,
+}
+
+impl LayoutMode {
+    /// Determine layout mode based on terminal width
+    pub fn for_width(width: u16) -> Self {
+        if width >= 80 {
+            LayoutMode::Full
+        } else {
+            LayoutMode::Compact
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_layout_calculation() {
+        let area = Rect::new(0, 0, 120, 40);
+        let layout = AppLayout::calculate(area);
+
+        // Header should be at top
+        assert_eq!(layout.header_area.y, 0);
+        assert_eq!(layout.header_area.height, 1);
+
+        // Tabs should be after header
+        assert_eq!(layout.tabs_area.y, 1);
+        assert_eq!(layout.tabs_area.height, 1);
+
+        // Status should be at bottom
+        assert_eq!(layout.status_area.y, 39);
+        assert_eq!(layout.status_area.height, 1);
+
+        // Chat area should have most of the space (40 - header - tabs - divider*2 - input - status = 34)
+        assert!(layout.chat_area.height > 20);
+    }
+
+    #[test]
+    fn test_layout_mode() {
+        assert_eq!(LayoutMode::for_width(80), LayoutMode::Full);
+        assert_eq!(LayoutMode::for_width(120), LayoutMode::Full);
+        assert_eq!(LayoutMode::for_width(79), LayoutMode::Compact);
+        assert_eq!(LayoutMode::for_width(60), LayoutMode::Compact);
+    }
+}

crates/app/ui/src/lib.rs

@@ -0,0 +1,49 @@
+pub mod app;
+pub mod completions;
+pub mod components;
+pub mod events;
+pub mod formatting;
+pub mod layout;
+pub mod output;
+pub mod provider_manager;
+pub mod theme;
+
+pub use app::TuiApp;
+pub use completions::{CompletionEngine, Completion, CommandInfo};
+pub use events::AppEvent;
+pub use output::{CommandOutput, OutputFormat, TreeNode, ListItem};
+pub use formatting::{
+    FormattedContent, MarkdownRenderer, SyntaxHighlighter,
+    format_file_path, format_tool_name, format_error, format_success, format_warning, format_info,
+};
+pub use provider_manager::ProviderManager;
+
+use auth_manager::AuthManager;
+use color_eyre::eyre::Result;
+use std::sync::Arc;
+
+/// Run the TUI application with a single provider (legacy mode)
+pub async fn run(
+    client: Arc<dyn llm_core::LlmProvider>,
+    opts: llm_core::ChatOptions,
+    perms: permissions::PermissionManager,
+    settings: config_agent::Settings,
+) -> Result<()> {
+    let mut app = TuiApp::new(client, opts, perms, settings)?;
+    app.run().await
+}
+
+/// Run the TUI application with multi-provider support and engine integration
+/// Uses a shared ProviderManager for dynamic provider/model switching
+pub async fn run_with_providers(
+    provider_manager: Arc<tokio::sync::Mutex<ProviderManager>>,
+    perms: permissions::PermissionManager,
+    settings: config_agent::Settings,
+    engine_tx: tokio::sync::mpsc::Sender<agent_core::messages::Message>,
+    shared_state: Arc<tokio::sync::Mutex<agent_core::state::AppState>>,
+    engine_rx: tokio::sync::mpsc::Receiver<agent_core::messages::Message>,
+) -> Result<()> {
+    let mut app = TuiApp::with_shared_provider_manager(provider_manager, perms, settings)?;
+    app.set_engine(engine_tx, shared_state, engine_rx);
+    app.run().await
+}

crates/app/ui/src/output.rs

@@ -0,0 +1,388 @@
+//! Rich command output formatting
+//!
+//! Provides formatted output for commands like /help, /mcp, /hooks
+//! with tables, trees, and syntax highlighting.
+
+use ratatui::text::{Line, Span};
+use ratatui::style::{Color, Modifier, Style};
+
+use crate::completions::CommandInfo;
+use crate::theme::Theme;
+
+/// A tree node for hierarchical display
+#[derive(Debug, Clone)]
+pub struct TreeNode {
+    pub label: String,
+    pub children: Vec<TreeNode>,
+}
+
+impl TreeNode {
+    pub fn new(label: impl Into<String>) -> Self {
+        Self {
+            label: label.into(),
+            children: vec![],
+        }
+    }
+
+    pub fn with_children(mut self, children: Vec<TreeNode>) -> Self {
+        self.children = children;
+        self
+    }
+}
+
+/// A list item with optional icon/marker
+#[derive(Debug, Clone)]
+pub struct ListItem {
+    pub text: String,
+    pub marker: Option<String>,
+    pub style: Option<Style>,
+}
+
+/// Different output formats
+#[derive(Debug, Clone)]
+pub enum OutputFormat {
+    /// Formatted table with headers and rows
+    Table {
+        headers: Vec<String>,
+        rows: Vec<Vec<String>>,
+    },
+    /// Hierarchical tree view
+    Tree {
+        root: TreeNode,
+    },
+    /// Syntax-highlighted code block
+    Code {
+        language: String,
+        content: String,
+    },
+    /// Side-by-side diff view
+    Diff {
+        old: String,
+        new: String,
+    },
+    /// Simple list with markers
+    List {
+        items: Vec<ListItem>,
+    },
+    /// Plain text
+    Text {
+        content: String,
+    },
+}
+
+/// Rich command output renderer
+pub struct CommandOutput {
+    pub format: OutputFormat,
+}
+
+impl CommandOutput {
+    pub fn new(format: OutputFormat) -> Self {
+        Self { format }
+    }
+
+    /// Create a help table output
+    pub fn help_table(commands: &[CommandInfo]) -> Self {
+        let headers = vec![
+            "Command".to_string(),
+            "Description".to_string(),
+            "Source".to_string(),
+        ];
+
+        let rows: Vec<Vec<String>> = commands
+            .iter()
+            .map(|c| vec![
+                format!("/{}", c.name),
+                c.description.clone(),
+                c.source.clone(),
+            ])
+            .collect();
+
+        Self {
+            format: OutputFormat::Table { headers, rows },
+        }
+    }
+
+    /// Create an MCP servers tree view
+    pub fn mcp_tree(servers: &[(String, Vec<String>)]) -> Self {
+        let children: Vec<TreeNode> = servers
+            .iter()
+            .map(|(name, tools)| {
+                TreeNode {
+                    label: name.clone(),
+                    children: tools.iter().map(|t| TreeNode::new(t)).collect(),
+                }
+            })
+            .collect();
+
+        Self {
+            format: OutputFormat::Tree {
+                root: TreeNode {
+                    label: "MCP Servers".to_string(),
+                    children,
+                },
+            },
+        }
+    }
+
+    /// Create a hooks list output
+    pub fn hooks_list(hooks: &[(String, String, bool)]) -> Self {
+        let items: Vec<ListItem> = hooks
+            .iter()
+            .map(|(event, path, enabled)| {
+                let marker = if *enabled { "✓" } else { "✗" };
+                let style = if *enabled {
+                    Some(Style::default().fg(Color::Green))
+                } else {
+                    Some(Style::default().fg(Color::Red))
+                };
+                ListItem {
+                    text: format!("{}: {}", event, path),
+                    marker: Some(marker.to_string()),
+                    style,
+                }
+            })
+            .collect();
+
+        Self {
+            format: OutputFormat::List { items },
+        }
+    }
+
+    /// Render to TUI Lines
+    pub fn render(&self, theme: &Theme) -> Vec<Line<'static>> {
+        match &self.format {
+            OutputFormat::Table { headers, rows } => {
+                self.render_table(headers, rows, theme)
+            }
+            OutputFormat::Tree { root } => {
+                self.render_tree(root, 0, theme)
+            }
+            OutputFormat::List { items } => {
+                self.render_list(items, theme)
+            }
+            OutputFormat::Code { content, .. } => {
+                content.lines()
+                    .map(|line| Line::from(Span::styled(line.to_string(), theme.tool_call)))
+                    .collect()
+            }
+            OutputFormat::Diff { old, new } => {
+                self.render_diff(old, new, theme)
+            }
+            OutputFormat::Text { content } => {
+                content.lines()
+                    .map(|line| Line::from(line.to_string()))
+                    .collect()
+            }
+        }
+    }
+
+    fn render_table(&self, headers: &[String], rows: &[Vec<String>], theme: &Theme) -> Vec<Line<'static>> {
+        let mut lines = Vec::new();
+
+        // Calculate column widths
+        let mut widths: Vec<usize> = headers.iter().map(|h| h.len()).collect();
+        for row in rows {
+            for (i, cell) in row.iter().enumerate() {
+                if i < widths.len() {
+                    widths[i] = widths[i].max(cell.len());
+                }
+            }
+        }
+
+        // Header line
+        let header_spans: Vec<Span> = headers
+            .iter()
+            .enumerate()
+            .flat_map(|(i, h)| {
+                let padded = format!("{:width$}", h, width = widths.get(i).copied().unwrap_or(h.len()));
+                vec![
+                    Span::styled(padded, Style::default().add_modifier(Modifier::BOLD)),
+                    Span::raw("  "),
+                ]
+            })
+            .collect();
+        lines.push(Line::from(header_spans));
+
+        // Separator
+        let sep: String = widths.iter().map(|w| "─".repeat(*w)).collect::<Vec<_>>().join("──");
+        lines.push(Line::from(Span::styled(sep, theme.status_dim)));
+
+        // Rows
+        for row in rows {
+            let row_spans: Vec<Span> = row
+                .iter()
+                .enumerate()
+                .flat_map(|(i, cell)| {
+                    let padded = format!("{:width$}", cell, width = widths.get(i).copied().unwrap_or(cell.len()));
+                    let style = if i == 0 {
+                        theme.status_accent // Command names in accent color
+                    } else {
+                        theme.status_bar
+                    };
+                    vec![
+                        Span::styled(padded, style),
+                        Span::raw("  "),
+                    ]
+                })
+                .collect();
+            lines.push(Line::from(row_spans));
+        }
+
+        lines
+    }
+
+    fn render_tree(&self, node: &TreeNode, depth: usize, theme: &Theme) -> Vec<Line<'static>> {
+        let mut lines = Vec::new();
+
+        // Render current node
+        let prefix = if depth == 0 {
+            "".to_string()
+        } else {
+            format!("{}├─ ", "│  ".repeat(depth - 1))
+        };
+
+        let style = if depth == 0 {
+            Style::default().add_modifier(Modifier::BOLD)
+        } else if node.children.is_empty() {
+            theme.status_bar
+        } else {
+            theme.status_accent
+        };
+
+        lines.push(Line::from(vec![
+            Span::styled(prefix, theme.status_dim),
+            Span::styled(node.label.clone(), style),
+        ]));
+
+        // Render children
+        for child in &node.children {
+            lines.extend(self.render_tree(child, depth + 1, theme));
+        }
+
+        lines
+    }
+
+    fn render_list(&self, items: &[ListItem], theme: &Theme) -> Vec<Line<'static>> {
+        items
+            .iter()
+            .map(|item| {
+                let marker_span = if let Some(marker) = &item.marker {
+                    Span::styled(
+                        format!("{} ", marker),
+                        item.style.unwrap_or(theme.status_bar),
+                    )
+                } else {
+                    Span::raw("• ")
+                };
+
+                Line::from(vec![
+                    marker_span,
+                    Span::styled(
+                        item.text.clone(),
+                        item.style.unwrap_or(theme.status_bar),
+                    ),
+                ])
+            })
+            .collect()
+    }
+
+    fn render_diff(&self, old: &str, new: &str, _theme: &Theme) -> Vec<Line<'static>> {
+        let mut lines = Vec::new();
+
+        // Simple line-by-line diff
+        let old_lines: Vec<&str> = old.lines().collect();
+        let new_lines: Vec<&str> = new.lines().collect();
+
+        let max_len = old_lines.len().max(new_lines.len());
+
+        for i in 0..max_len {
+            let old_line = old_lines.get(i).copied().unwrap_or("");
+            let new_line = new_lines.get(i).copied().unwrap_or("");
+
+            if old_line != new_line {
+                if !old_line.is_empty() {
+                    lines.push(Line::from(Span::styled(
+                        format!("- {}", old_line),
+                        Style::default().fg(Color::Red),
+                    )));
+                }
+                if !new_line.is_empty() {
+                    lines.push(Line::from(Span::styled(
+                        format!("+ {}", new_line),
+                        Style::default().fg(Color::Green),
+                    )));
+                }
+            } else {
+                lines.push(Line::from(format!("  {}", old_line)));
+            }
+        }
+
+        lines
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_help_table() {
+        let commands = vec![
+            CommandInfo::new("help", "Show help", "builtin"),
+            CommandInfo::new("clear", "Clear screen", "builtin"),
+        ];
+        let output = CommandOutput::help_table(&commands);
+
+        match output.format {
+            OutputFormat::Table { headers, rows } => {
+                assert_eq!(headers.len(), 3);
+                assert_eq!(rows.len(), 2);
+            }
+            _ => panic!("Expected Table format"),
+        }
+    }
+
+    #[test]
+    fn test_mcp_tree() {
+        let servers = vec![
+            ("filesystem".to_string(), vec!["read".to_string(), "write".to_string()]),
+            ("database".to_string(), vec!["query".to_string()]),
+        ];
+        let output = CommandOutput::mcp_tree(&servers);
+
+        match output.format {
+            OutputFormat::Tree { root } => {
+                assert_eq!(root.label, "MCP Servers");
+                assert_eq!(root.children.len(), 2);
+            }
+            _ => panic!("Expected Tree format"),
+        }
+    }
+
+    #[test]
+    fn test_hooks_list() {
+        let hooks = vec![
+            ("PreToolUse".to_string(), "./hooks/pre".to_string(), true),
+            ("PostToolUse".to_string(), "./hooks/post".to_string(), false),
+        ];
+        let output = CommandOutput::hooks_list(&hooks);
+
+        match output.format {
+            OutputFormat::List { items } => {
+                assert_eq!(items.len(), 2);
+            }
+            _ => panic!("Expected List format"),
+        }
+    }
+
+    #[test]
+    fn test_tree_node() {
+        let node = TreeNode::new("root")
+            .with_children(vec![
+                TreeNode::new("child1"),
+                TreeNode::new("child2"),
+            ]);
+        assert_eq!(node.label, "root");
+        assert_eq!(node.children.len(), 2);
+    }
+}

crates/app/ui/src/provider_manager.rs

@@ -0,0 +1,417 @@
+//! Provider Manager for In-Session Switching
+//!
+//! Manages multiple LLM providers with lazy initialization, enabling
+//! seamless provider switching during a TUI session without restart.
+
+use auth_manager::AuthManager;
+use llm_anthropic::AnthropicClient;
+use llm_core::{AuthMethod, LlmProvider, ModelInfo, ProviderInfo, ProviderType};
+use llm_ollama::OllamaClient;
+use llm_openai::OpenAIClient;
+use std::collections::HashMap;
+use std::sync::Arc;
+
+/// Error type for provider operations
+#[derive(Debug)]
+pub enum ProviderError {
+    /// Provider requires authentication
+    AuthRequired(String),
+    /// Failed to create provider
+    CreationFailed(String),
+    /// Failed to list models
+    ModelListFailed(String),
+}
+
+impl std::fmt::Display for ProviderError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::AuthRequired(msg) => write!(f, "Authentication required: {}", msg),
+            Self::CreationFailed(msg) => write!(f, "Provider creation failed: {}", msg),
+            Self::ModelListFailed(msg) => write!(f, "Failed to list models: {}", msg),
+        }
+    }
+}
+
+impl std::error::Error for ProviderError {}
+
+/// Manages multiple LLM providers with lazy initialization
+pub struct ProviderManager {
+    /// Auth manager for retrieving credentials
+    auth_manager: Arc<AuthManager>,
+
+    /// Cached provider clients (created on-demand)
+    providers: HashMap<ProviderType, Arc<dyn LlmProvider>>,
+
+    /// Current model per provider
+    models: HashMap<ProviderType, String>,
+
+    /// Currently active provider
+    current_provider: ProviderType,
+
+    /// Ollama base URL for local instances
+    ollama_url: String,
+
+    /// Settings for fallback API keys
+    settings: config_agent::Settings,
+}
+
+impl ProviderManager {
+    /// Create a new provider manager
+    pub fn new(
+        auth_manager: Arc<AuthManager>,
+        settings: config_agent::Settings,
+    ) -> Self {
+        // Determine initial provider from settings
+        let initial_provider = settings.get_provider().unwrap_or(ProviderType::Ollama);
+
+        // Initialize models from per-provider settings or defaults
+        let mut models = HashMap::new();
+        models.insert(
+            ProviderType::Ollama,
+            settings.get_model_for_provider(ProviderType::Ollama),
+        );
+        models.insert(
+            ProviderType::Anthropic,
+            settings.get_model_for_provider(ProviderType::Anthropic),
+        );
+        models.insert(
+            ProviderType::OpenAI,
+            settings.get_model_for_provider(ProviderType::OpenAI),
+        );
+
+        Self {
+            auth_manager,
+            providers: HashMap::new(),
+            models,
+            current_provider: initial_provider,
+            ollama_url: settings.ollama_url.clone(),
+            settings,
+        }
+    }
+
+    /// Get the currently active provider type
+    pub fn current_provider_type(&self) -> ProviderType {
+        self.current_provider
+    }
+
+    /// Get the current model for the active provider
+    pub fn current_model(&self) -> &str {
+        self.models
+            .get(&self.current_provider)
+            .map(|s| s.as_str())
+            .unwrap_or(self.current_provider.default_model())
+    }
+
+    /// Get the model for a specific provider
+    pub fn model_for_provider(&self, provider: ProviderType) -> &str {
+        self.models
+            .get(&provider)
+            .map(|s| s.as_str())
+            .unwrap_or(provider.default_model())
+    }
+
+    /// Set the model for a provider
+    pub fn set_model(&mut self, provider: ProviderType, model: String) {
+        self.models.insert(provider, model.clone());
+
+        // Update settings and save
+        self.settings.set_model_for_provider(provider, &model);
+        if let Err(e) = self.settings.save() {
+            // Log but don't fail - saving is best-effort
+            eprintln!("Warning: Failed to save model preference: {}", e);
+        }
+
+        // If provider is already initialized, we need to recreate it with the new model
+        // For simplicity, just remove it so it will be recreated on next access
+        self.providers.remove(&provider);
+    }
+
+    /// Set the model for the current provider
+    pub fn set_current_model(&mut self, model: String) {
+        self.set_model(self.current_provider, model);
+    }
+
+    /// Check if a provider is authenticated
+    pub fn is_authenticated(&self, provider: ProviderType) -> bool {
+        match provider {
+            ProviderType::Ollama => true, // Local Ollama doesn't need auth
+            _ => self.auth_manager.get_auth(provider).is_ok(),
+        }
+    }
+
+    /// Get the active provider client, creating it if necessary
+    pub fn get_provider(&mut self) -> Result<Arc<dyn LlmProvider>, ProviderError> {
+        self.get_provider_for_type(self.current_provider)
+    }
+
+    /// Get a specific provider client, creating it if necessary
+    pub fn get_provider_for_type(
+        &mut self,
+        provider_type: ProviderType,
+    ) -> Result<Arc<dyn LlmProvider>, ProviderError> {
+        // Return cached provider if available
+        if let Some(provider) = self.providers.get(&provider_type) {
+            return Ok(Arc::clone(provider));
+        }
+
+        // Create new provider
+        let model = self.model_for_provider(provider_type).to_string();
+        let provider = self.create_provider(provider_type, &model)?;
+
+        // Cache and return
+        self.providers.insert(provider_type, Arc::clone(&provider));
+        Ok(provider)
+    }
+
+    /// Switch to a different provider
+    pub fn switch_provider(&mut self, provider_type: ProviderType) -> Result<Arc<dyn LlmProvider>, ProviderError> {
+        self.current_provider = provider_type;
+        self.get_provider()
+    }
+
+    /// Create a provider client with authentication
+    fn create_provider(
+        &self,
+        provider_type: ProviderType,
+        model: &str,
+    ) -> Result<Arc<dyn LlmProvider>, ProviderError> {
+        match provider_type {
+            ProviderType::Ollama => {
+                // Check for Ollama Cloud vs local
+                let use_cloud = model.ends_with("-cloud");
+
+                let client = if use_cloud {
+                    // Try to get Ollama Cloud API key
+                    match self.auth_manager.get_auth(ProviderType::Ollama) {
+                        Ok(AuthMethod::ApiKey(key)) => {
+                            OllamaClient::with_cloud().with_api_key(key)
+                        }
+                        _ => {
+                            return Err(ProviderError::AuthRequired(
+                                "Ollama Cloud requires API key. Run 'owlen login ollama'".to_string()
+                            ));
+                        }
+                    }
+                } else {
+                    // Local Ollama - no auth needed
+                    let mut client = OllamaClient::new(&self.ollama_url);
+
+                    // Add API key if available (for authenticated local instances)
+                    if let Ok(AuthMethod::ApiKey(key)) = self.auth_manager.get_auth(ProviderType::Ollama) {
+                        client = client.with_api_key(key);
+                    }
+
+                    client
+                };
+
+                Ok(Arc::new(client.with_model(model)) as Arc<dyn LlmProvider>)
+            }
+
+            ProviderType::Anthropic => {
+                // Try auth manager first, then settings fallback
+                let auth = self.auth_manager.get_auth(ProviderType::Anthropic)
+                    .ok()
+                    .or_else(|| self.settings.anthropic_api_key.clone().map(AuthMethod::ApiKey))
+                    .ok_or_else(|| ProviderError::AuthRequired(
+                        "Run 'owlen login anthropic' or set ANTHROPIC_API_KEY".to_string()
+                    ))?;
+
+                let client = AnthropicClient::with_auth(auth).with_model(model);
+                Ok(Arc::new(client) as Arc<dyn LlmProvider>)
+            }
+
+            ProviderType::OpenAI => {
+                // Try auth manager first, then settings fallback
+                let auth = self.auth_manager.get_auth(ProviderType::OpenAI)
+                    .ok()
+                    .or_else(|| self.settings.openai_api_key.clone().map(AuthMethod::ApiKey))
+                    .ok_or_else(|| ProviderError::AuthRequired(
+                        "Run 'owlen login openai' or set OPENAI_API_KEY".to_string()
+                    ))?;
+
+                let client = OpenAIClient::with_auth(auth).with_model(model);
+                Ok(Arc::new(client) as Arc<dyn LlmProvider>)
+            }
+        }
+    }
+
+    /// List available models for the current provider
+    pub async fn list_models(&self) -> Result<Vec<ModelInfo>, ProviderError> {
+        self.list_models_for_provider(self.current_provider).await
+    }
+
+    /// List available models for a specific provider (only tool-capable models)
+    pub async fn list_models_for_provider(
+        &self,
+        provider_type: ProviderType,
+    ) -> Result<Vec<ModelInfo>, ProviderError> {
+        let models = match provider_type {
+            ProviderType::Ollama => {
+                // For Ollama, we need to fetch from the API
+                let client = OllamaClient::new(&self.ollama_url);
+                let mut models = client
+                    .list_models()
+                    .await
+                    .map_err(|e| ProviderError::ModelListFailed(e.to_string()))?;
+
+                // Update supports_tools based on known tool-capable model patterns
+                for model in &mut models {
+                    model.supports_tools = is_ollama_tool_capable(&model.id);
+                }
+                models
+            }
+            ProviderType::Anthropic => {
+                // Anthropic: return hardcoded list (no API endpoint)
+                let client = AnthropicClient::new("dummy"); // Key not needed for list_models
+                client
+                    .list_models()
+                    .await
+                    .map_err(|e| ProviderError::ModelListFailed(e.to_string()))?
+            }
+            ProviderType::OpenAI => {
+                // OpenAI: return hardcoded list
+                let client = OpenAIClient::new("dummy");
+                client
+                    .list_models()
+                    .await
+                    .map_err(|e| ProviderError::ModelListFailed(e.to_string()))?
+            }
+        };
+
+        // Filter to only tool-capable models
+        Ok(models.into_iter().filter(|m| m.supports_tools).collect())
+    }
+
+    /// Get authentication status for all providers
+    pub fn auth_status(&self) -> Vec<(ProviderType, bool, Option<String>)> {
+        vec![
+            (
+                ProviderType::Ollama,
+                true, // Always "authenticated" for local
+                Some("Local (no auth required)".to_string()),
+            ),
+            (
+                ProviderType::Anthropic,
+                self.is_authenticated(ProviderType::Anthropic),
+                if self.is_authenticated(ProviderType::Anthropic) {
+                    Some("API key configured".to_string())
+                } else {
+                    Some("Not authenticated".to_string())
+                },
+            ),
+            (
+                ProviderType::OpenAI,
+                self.is_authenticated(ProviderType::OpenAI),
+                if self.is_authenticated(ProviderType::OpenAI) {
+                    Some("API key configured".to_string())
+                } else {
+                    Some("Not authenticated".to_string())
+                },
+            ),
+        ]
+    }
+}
+
+/// Check if an Ollama model is known to support tool calling
+fn is_ollama_tool_capable(model_id: &str) -> bool {
+    let model_lower = model_id.to_lowercase();
+
+    // Extract base model name (before the colon for size variants)
+    let base_name = model_lower.split(':').next().unwrap_or(&model_lower);
+
+    // Models known to support tool calling well
+    let tool_capable_patterns = [
+        "qwen",          // Qwen models (qwen3, qwen2.5, etc.)
+        "llama3.1",      // Llama 3.1 and above
+        "llama3.2",      // Llama 3.2
+        "llama3.3",      // Llama 3.3
+        "mistral",       // Mistral models
+        "mixtral",       // Mixtral models
+        "deepseek",      // DeepSeek models
+        "command-r",     // Cohere Command-R
+        "gemma2",        // Gemma 2 (some versions)
+        "phi3",          // Phi-3 models
+        "phi4",          // Phi-4 models
+        "granite",       // IBM Granite
+        "hermes",        // Hermes models
+        "openhermes",    // OpenHermes
+        "nous-hermes",   // Nous Hermes
+        "dolphin",       // Dolphin models
+        "wizard",        // WizardLM
+        "codellama",     // Code Llama
+        "starcoder",     // StarCoder
+        "codegemma",     // CodeGemma
+        "gpt-oss",       // GPT-OSS models
+    ];
+
+    // Check if model matches any known pattern
+    for pattern in tool_capable_patterns {
+        if base_name.contains(pattern) {
+            // Exclude small models (< 4B parameters) as they often struggle with tools
+            if let Some(size_part) = model_lower.split(':').nth(1) {
+                if is_small_model(size_part) {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+
+    false
+}
+
+/// Check if a model size string indicates a small model (< 4B parameters)
+fn is_small_model(size_str: &str) -> bool {
+    // Extract the numeric part from strings like "1b", "1.5b", "3b", "8b", etc.
+    let size_lower = size_str.to_lowercase();
+
+    // Try to extract the number before 'b'
+    if let Some(b_pos) = size_lower.find('b') {
+        let num_part = &size_lower[..b_pos];
+        // Parse as float to handle "1.5", "0.5", etc.
+        if let Ok(size) = num_part.parse::<f32>() {
+            return size < 4.0; // Exclude models smaller than 4B
+        }
+    }
+
+    false // If we can't parse it, assume it's fine
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_models() {
+        let settings = config_agent::Settings::default();
+        let auth_manager = Arc::new(AuthManager::new().unwrap());
+        let manager = ProviderManager::new(auth_manager, settings);
+
+        // Check default models are set
+        assert!(!manager.model_for_provider(ProviderType::Ollama).is_empty());
+        assert!(!manager.model_for_provider(ProviderType::Anthropic).is_empty());
+        assert!(!manager.model_for_provider(ProviderType::OpenAI).is_empty());
+    }
+
+    #[test]
+    fn test_ollama_tool_capability_detection() {
+        // Tool-capable models
+        assert!(is_ollama_tool_capable("qwen3:8b"));
+        assert!(is_ollama_tool_capable("qwen2.5:7b"));
+        assert!(is_ollama_tool_capable("llama3.1:8b"));
+        assert!(is_ollama_tool_capable("llama3.2:8b"));
+        assert!(is_ollama_tool_capable("mistral:7b"));
+        assert!(is_ollama_tool_capable("deepseek-coder:6.7b"));
+        assert!(is_ollama_tool_capable("gpt-oss:120b-cloud"));
+
+        // Small models excluded (1b, 2b, 3b)
+        assert!(!is_ollama_tool_capable("llama3.2:1b"));
+        assert!(!is_ollama_tool_capable("llama3.2:3b"));
+        assert!(!is_ollama_tool_capable("qwen2.5:1.5b"));
+
+        // Unknown models
+        assert!(!is_ollama_tool_capable("gemma:7b"));  // gemma (not gemma2)
+        assert!(!is_ollama_tool_capable("llama2:7b")); // llama2, not 3.x
+        assert!(!is_ollama_tool_capable("tinyllama:1b"));
+    }
+}

crates/app/ui/src/theme.rs

@@ -0,0 +1,707 @@
+//! Theme system for the borderless TUI design
+//!
+//! Provides color palettes, semantic styling, and terminal capability detection
+//! for graceful degradation across different terminal emulators.
+
+use ratatui::style::{Color, Modifier, Style};
+
+/// Terminal capability detection for graceful degradation
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum TerminalCapability {
+    /// Full Unicode support with true color
+    Full,
+    /// Basic Unicode with 256 colors
+    Unicode256,
+    /// ASCII only with 16 colors
+    Basic,
+}
+
+impl TerminalCapability {
+    /// Detect terminal capabilities from environment
+    pub fn detect() -> Self {
+        // Check for true color support
+        let colorterm = std::env::var("COLORTERM").unwrap_or_default();
+        let term = std::env::var("TERM").unwrap_or_default();
+
+        if colorterm == "truecolor" || colorterm == "24bit" {
+            return Self::Full;
+        }
+
+        if term.contains("256color") || term.contains("kitty") || term.contains("alacritty") {
+            return Self::Unicode256;
+        }
+
+        // Check if we're in a linux VT or basic terminal
+        if term == "linux" || term == "vt100" || term == "dumb" {
+            return Self::Basic;
+        }
+
+        // Default to unicode with 256 colors
+        Self::Unicode256
+    }
+
+    /// Check if Unicode box drawing is supported
+    pub fn supports_unicode(&self) -> bool {
+        matches!(self, Self::Full | Self::Unicode256)
+    }
+
+    /// Check if true color (RGB) is supported
+    pub fn supports_truecolor(&self) -> bool {
+        matches!(self, Self::Full)
+    }
+}
+
+/// Symbols with fallbacks for different terminal capabilities
+#[derive(Debug, Clone)]
+pub struct Symbols {
+    pub horizontal_rule: &'static str,
+    pub vertical_separator: &'static str,
+    pub bullet: &'static str,
+    pub arrow: &'static str,
+    pub check: &'static str,
+    pub cross: &'static str,
+    pub warning: &'static str,
+    pub info: &'static str,
+    pub streaming: &'static str,
+    pub user_prefix: &'static str,
+    pub assistant_prefix: &'static str,
+    pub tool_prefix: &'static str,
+    pub system_prefix: &'static str,
+    // Provider icons
+    pub claude_icon: &'static str,
+    pub ollama_icon: &'static str,
+    pub openai_icon: &'static str,
+    // Vim mode indicators
+    pub mode_normal: &'static str,
+    pub mode_insert: &'static str,
+    pub mode_visual: &'static str,
+    pub mode_command: &'static str,
+}
+
+impl Symbols {
+    /// Unicode symbols for capable terminals
+    pub fn unicode() -> Self {
+        Self {
+            horizontal_rule: "─",
+            vertical_separator: "│",
+            bullet: "•",
+            arrow: "→",
+            check: "✓",
+            cross: "✗",
+            warning: "⚠",
+            info: "ℹ",
+            streaming: "●",
+            user_prefix: "❯",
+            assistant_prefix: "◆",
+            tool_prefix: "⚡",
+            system_prefix: "○",
+            claude_icon: "󰚩",
+            ollama_icon: "󰫢",
+            openai_icon: "󰊤",
+            mode_normal: "[N]",
+            mode_insert: "[I]",
+            mode_visual: "[V]",
+            mode_command: "[:]",
+        }
+    }
+
+    /// ASCII fallback symbols
+    pub fn ascii() -> Self {
+        Self {
+            horizontal_rule: "-",
+            vertical_separator: "|",
+            bullet: "*",
+            arrow: "->",
+            check: "+",
+            cross: "x",
+            warning: "!",
+            info: "i",
+            streaming: "*",
+            user_prefix: ">",
+            assistant_prefix: "-",
+            tool_prefix: "#",
+            system_prefix: "-",
+            claude_icon: "C",
+            ollama_icon: "O",
+            openai_icon: "G",
+            mode_normal: "[N]",
+            mode_insert: "[I]",
+            mode_visual: "[V]",
+            mode_command: "[:]",
+        }
+    }
+
+    /// Select symbols based on terminal capability
+    pub fn for_capability(cap: TerminalCapability) -> Self {
+        match cap {
+            TerminalCapability::Full | TerminalCapability::Unicode256 => Self::unicode(),
+            TerminalCapability::Basic => Self::ascii(),
+        }
+    }
+}
+
+/// Modern color palette inspired by contemporary design systems
+///
+/// Color assignment principles:
+/// - fg (#c0caf5): PRIMARY text - user messages, command names
+/// - assistant (#9aa5ce): Soft gray-blue for AI responses (distinct from user)
+/// - accent (#7aa2f7): Interactive elements ONLY (mode, prompt symbol)
+/// - cmd_slash (#bb9af7): Purple for / prefix (signals "command")
+/// - fg_dim (#565f89): Timestamps, hints, inactive elements
+/// - selection (#283457): Highlighted row background
+#[derive(Debug, Clone)]
+pub struct ColorPalette {
+    pub primary: Color,
+    pub secondary: Color,
+    pub accent: Color,
+    pub success: Color,
+    pub warning: Color,
+    pub error: Color,
+    pub info: Color,
+    pub bg: Color,
+    pub fg: Color,
+    pub fg_dim: Color,
+    pub fg_muted: Color,
+    pub highlight: Color,
+    pub border: Color,           // For horizontal rules (subtle)
+    pub selection: Color,        // Highlighted row background
+    // Provider-specific colors
+    pub claude: Color,
+    pub ollama: Color,
+    pub openai: Color,
+    // Semantic colors for messages
+    pub user_fg: Color,          // User message text (bright, fg)
+    pub assistant_fg: Color,     // Assistant message text (soft gray-blue)
+    pub tool_fg: Color,
+    pub timestamp_fg: Color,
+    pub divider_fg: Color,
+    // Command colors
+    pub cmd_slash: Color,        // Purple for / prefix
+    pub cmd_name: Color,         // Command name (same as fg)
+    pub cmd_desc: Color,         // Command description (dim)
+    // Overlay/modal colors
+    pub overlay_bg: Color,       // Slightly lighter than main bg
+}
+
+impl ColorPalette {
+    /// Tokyo Night inspired palette - high contrast, readable
+    ///
+    /// Key principles:
+    /// - fg (#c0caf5) for user messages and command names
+    /// - assistant (#a9b1d6) brighter gray-blue for AI responses (readable)
+    /// - accent (#7aa2f7) only for interactive elements (mode indicator, prompt symbol)
+    /// - cmd_slash (#bb9af7) purple for / prefix (signals "command")
+    /// - fg_dim (#737aa2) for timestamps, hints, descriptions (brighter than before)
+    /// - border (#3b4261) for horizontal rules
+    pub fn tokyo_night() -> Self {
+        Self {
+            primary: Color::Rgb(122, 162, 247),    // #7aa2f7 - Blue accent
+            secondary: Color::Rgb(187, 154, 247),  // #bb9af7 - Purple
+            accent: Color::Rgb(122, 162, 247),     // #7aa2f7 - Interactive elements ONLY
+            success: Color::Rgb(158, 206, 106),    // #9ece6a - Green
+            warning: Color::Rgb(224, 175, 104),    // #e0af68 - Yellow
+            error: Color::Rgb(247, 118, 142),      // #f7768e - Pink/Red
+            info: Color::Rgb(125, 207, 255),       // Cyan (rarely used)
+            bg: Color::Rgb(26, 27, 38),            // #1a1b26 - Dark bg
+            fg: Color::Rgb(192, 202, 245),         // #c0caf5 - Primary text (HIGH CONTRAST)
+            fg_dim: Color::Rgb(115, 122, 162),     // #737aa2 - Secondary text (BRIGHTER)
+            fg_muted: Color::Rgb(86, 95, 137),     // #565f89 - Very dim
+            highlight: Color::Rgb(56, 62, 90),     // Selection bg (legacy)
+            border: Color::Rgb(73, 82, 115),       // #495273 - Horizontal rules (BRIGHTER)
+            selection: Color::Rgb(40, 52, 87),     // #283457 - Highlighted row bg
+            // Provider colors
+            claude: Color::Rgb(217, 119, 87),      // Claude orange
+            ollama: Color::Rgb(122, 162, 247),     // Blue
+            openai: Color::Rgb(16, 163, 127),      // OpenAI green
+            // Message colors - user bright, assistant readable
+            user_fg: Color::Rgb(192, 202, 245),    // #c0caf5 - Same as fg (bright)
+            assistant_fg: Color::Rgb(169, 177, 214), // #a9b1d6 - Brighter gray-blue (READABLE)
+            tool_fg: Color::Rgb(224, 175, 104),    // #e0af68 - Yellow for tools
+            timestamp_fg: Color::Rgb(115, 122, 162), // #737aa2 - Brighter dim
+            divider_fg: Color::Rgb(73, 82, 115),   // #495273 - Border color (BRIGHTER)
+            // Command colors
+            cmd_slash: Color::Rgb(187, 154, 247),  // #bb9af7 - Purple for / prefix
+            cmd_name: Color::Rgb(192, 202, 245),   // #c0caf5 - White for command name
+            cmd_desc: Color::Rgb(115, 122, 162),   // #737aa2 - Brighter description
+            // Overlay colors
+            overlay_bg: Color::Rgb(36, 40, 59),    // #24283b - Slightly lighter than bg
+        }
+    }
+
+    /// Dracula inspired palette - classic and elegant
+    pub fn dracula() -> Self {
+        Self {
+            primary: Color::Rgb(139, 233, 253),    // Cyan
+            secondary: Color::Rgb(189, 147, 249),  // Purple
+            accent: Color::Rgb(255, 121, 198),     // Pink
+            success: Color::Rgb(80, 250, 123),     // Green
+            warning: Color::Rgb(241, 250, 140),    // Yellow
+            error: Color::Rgb(255, 85, 85),        // Red
+            info: Color::Rgb(139, 233, 253),       // Cyan
+            bg: Color::Rgb(40, 42, 54),            // Dark bg
+            fg: Color::Rgb(248, 248, 242),         // Light text
+            fg_dim: Color::Rgb(98, 114, 164),      // Comment
+            fg_muted: Color::Rgb(68, 71, 90),      // Very dim
+            highlight: Color::Rgb(68, 71, 90),     // Selection
+            border: Color::Rgb(68, 71, 90),
+            selection: Color::Rgb(68, 71, 90),
+            claude: Color::Rgb(255, 121, 198),
+            ollama: Color::Rgb(139, 233, 253),
+            openai: Color::Rgb(80, 250, 123),
+            user_fg: Color::Rgb(248, 248, 242),
+            assistant_fg: Color::Rgb(189, 186, 220),  // Softer purple-gray
+            tool_fg: Color::Rgb(241, 250, 140),
+            timestamp_fg: Color::Rgb(68, 71, 90),
+            divider_fg: Color::Rgb(68, 71, 90),
+            cmd_slash: Color::Rgb(189, 147, 249),    // Purple
+            cmd_name: Color::Rgb(248, 248, 242),
+            cmd_desc: Color::Rgb(98, 114, 164),
+            overlay_bg: Color::Rgb(50, 52, 64),
+        }
+    }
+
+    /// Catppuccin Mocha - warm and cozy
+    pub fn catppuccin() -> Self {
+        Self {
+            primary: Color::Rgb(137, 180, 250),    // Blue
+            secondary: Color::Rgb(203, 166, 247),  // Mauve
+            accent: Color::Rgb(245, 194, 231),     // Pink
+            success: Color::Rgb(166, 227, 161),    // Green
+            warning: Color::Rgb(249, 226, 175),    // Yellow
+            error: Color::Rgb(243, 139, 168),      // Red
+            info: Color::Rgb(148, 226, 213),       // Teal
+            bg: Color::Rgb(30, 30, 46),            // Base
+            fg: Color::Rgb(205, 214, 244),         // Text
+            fg_dim: Color::Rgb(108, 112, 134),     // Overlay
+            fg_muted: Color::Rgb(69, 71, 90),      // Surface
+            highlight: Color::Rgb(49, 50, 68),     // Surface
+            border: Color::Rgb(69, 71, 90),
+            selection: Color::Rgb(49, 50, 68),
+            claude: Color::Rgb(245, 194, 231),
+            ollama: Color::Rgb(137, 180, 250),
+            openai: Color::Rgb(166, 227, 161),
+            user_fg: Color::Rgb(205, 214, 244),
+            assistant_fg: Color::Rgb(166, 187, 213),  // Softer blue-gray
+            tool_fg: Color::Rgb(249, 226, 175),
+            timestamp_fg: Color::Rgb(69, 71, 90),
+            divider_fg: Color::Rgb(69, 71, 90),
+            cmd_slash: Color::Rgb(203, 166, 247),    // Mauve
+            cmd_name: Color::Rgb(205, 214, 244),
+            cmd_desc: Color::Rgb(108, 112, 134),
+            overlay_bg: Color::Rgb(40, 40, 56),
+        }
+    }
+
+    /// Nord - minimal and clean
+    pub fn nord() -> Self {
+        Self {
+            primary: Color::Rgb(136, 192, 208),    // Frost cyan
+            secondary: Color::Rgb(129, 161, 193),  // Frost blue
+            accent: Color::Rgb(180, 142, 173),     // Aurora purple
+            success: Color::Rgb(163, 190, 140),    // Aurora green
+            warning: Color::Rgb(235, 203, 139),    // Aurora yellow
+            error: Color::Rgb(191, 97, 106),       // Aurora red
+            info: Color::Rgb(136, 192, 208),       // Frost cyan
+            bg: Color::Rgb(46, 52, 64),            // Polar night
+            fg: Color::Rgb(236, 239, 244),         // Snow storm
+            fg_dim: Color::Rgb(76, 86, 106),       // Polar night light
+            fg_muted: Color::Rgb(59, 66, 82),
+            highlight: Color::Rgb(59, 66, 82),     // Selection
+            border: Color::Rgb(59, 66, 82),
+            selection: Color::Rgb(59, 66, 82),
+            claude: Color::Rgb(180, 142, 173),
+            ollama: Color::Rgb(136, 192, 208),
+            openai: Color::Rgb(163, 190, 140),
+            user_fg: Color::Rgb(236, 239, 244),
+            assistant_fg: Color::Rgb(180, 195, 210),  // Softer blue-gray
+            tool_fg: Color::Rgb(235, 203, 139),
+            timestamp_fg: Color::Rgb(59, 66, 82),
+            divider_fg: Color::Rgb(59, 66, 82),
+            cmd_slash: Color::Rgb(180, 142, 173),    // Aurora purple
+            cmd_name: Color::Rgb(236, 239, 244),
+            cmd_desc: Color::Rgb(76, 86, 106),
+            overlay_bg: Color::Rgb(56, 62, 74),
+        }
+    }
+
+    /// Synthwave - vibrant and retro
+    pub fn synthwave() -> Self {
+        Self {
+            primary: Color::Rgb(255, 0, 128),      // Hot pink
+            secondary: Color::Rgb(0, 229, 255),    // Cyan
+            accent: Color::Rgb(255, 128, 0),       // Orange
+            success: Color::Rgb(0, 255, 157),      // Neon green
+            warning: Color::Rgb(255, 215, 0),      // Gold
+            error: Color::Rgb(255, 64, 64),        // Neon red
+            info: Color::Rgb(0, 229, 255),         // Cyan
+            bg: Color::Rgb(20, 16, 32),            // Dark purple
+            fg: Color::Rgb(242, 233, 255),         // Light purple
+            fg_dim: Color::Rgb(127, 90, 180),      // Mid purple
+            fg_muted: Color::Rgb(72, 12, 168),
+            highlight: Color::Rgb(72, 12, 168),    // Deep purple
+            border: Color::Rgb(72, 12, 168),
+            selection: Color::Rgb(72, 12, 168),
+            claude: Color::Rgb(255, 128, 0),
+            ollama: Color::Rgb(0, 229, 255),
+            openai: Color::Rgb(0, 255, 157),
+            user_fg: Color::Rgb(242, 233, 255),
+            assistant_fg: Color::Rgb(180, 170, 220),  // Softer purple
+            tool_fg: Color::Rgb(255, 215, 0),
+            timestamp_fg: Color::Rgb(72, 12, 168),
+            divider_fg: Color::Rgb(72, 12, 168),
+            cmd_slash: Color::Rgb(255, 0, 128),      // Hot pink
+            cmd_name: Color::Rgb(242, 233, 255),
+            cmd_desc: Color::Rgb(127, 90, 180),
+            overlay_bg: Color::Rgb(30, 26, 42),
+        }
+    }
+
+    /// Rose Pine - elegant and muted
+    pub fn rose_pine() -> Self {
+        Self {
+            primary: Color::Rgb(156, 207, 216),    // Foam
+            secondary: Color::Rgb(235, 188, 186),  // Rose
+            accent: Color::Rgb(234, 154, 151),     // Love
+            success: Color::Rgb(49, 116, 143),     // Pine
+            warning: Color::Rgb(246, 193, 119),    // Gold
+            error: Color::Rgb(235, 111, 146),      // Love (darker)
+            info: Color::Rgb(156, 207, 216),       // Foam
+            bg: Color::Rgb(25, 23, 36),            // Base
+            fg: Color::Rgb(224, 222, 244),         // Text
+            fg_dim: Color::Rgb(110, 106, 134),     // Muted
+            fg_muted: Color::Rgb(42, 39, 63),
+            highlight: Color::Rgb(42, 39, 63),     // Highlight
+            border: Color::Rgb(42, 39, 63),
+            selection: Color::Rgb(42, 39, 63),
+            claude: Color::Rgb(234, 154, 151),
+            ollama: Color::Rgb(156, 207, 216),
+            openai: Color::Rgb(49, 116, 143),
+            user_fg: Color::Rgb(224, 222, 244),
+            assistant_fg: Color::Rgb(180, 185, 210),  // Softer lavender-gray
+            tool_fg: Color::Rgb(246, 193, 119),
+            timestamp_fg: Color::Rgb(42, 39, 63),
+            divider_fg: Color::Rgb(42, 39, 63),
+            cmd_slash: Color::Rgb(235, 188, 186),    // Rose
+            cmd_name: Color::Rgb(224, 222, 244),
+            cmd_desc: Color::Rgb(110, 106, 134),
+            overlay_bg: Color::Rgb(35, 33, 46),
+        }
+    }
+
+    /// Midnight Ocean - deep and serene
+    pub fn midnight_ocean() -> Self {
+        Self {
+            primary: Color::Rgb(102, 217, 239),    // Bright cyan
+            secondary: Color::Rgb(130, 170, 255),  // Periwinkle
+            accent: Color::Rgb(199, 146, 234),     // Purple
+            success: Color::Rgb(163, 190, 140),    // Sea green
+            warning: Color::Rgb(229, 200, 144),    // Sandy yellow
+            error: Color::Rgb(236, 95, 103),       // Coral red
+            info: Color::Rgb(102, 217, 239),       // Bright cyan
+            bg: Color::Rgb(1, 22, 39),             // Deep ocean
+            fg: Color::Rgb(201, 211, 235),         // Light blue-white
+            fg_dim: Color::Rgb(71, 103, 145),      // Muted blue
+            fg_muted: Color::Rgb(13, 43, 69),
+            highlight: Color::Rgb(13, 43, 69),     // Deep blue
+            border: Color::Rgb(13, 43, 69),
+            selection: Color::Rgb(13, 43, 69),
+            claude: Color::Rgb(199, 146, 234),
+            ollama: Color::Rgb(102, 217, 239),
+            openai: Color::Rgb(163, 190, 140),
+            user_fg: Color::Rgb(201, 211, 235),
+            assistant_fg: Color::Rgb(150, 175, 200),  // Softer blue-gray
+            tool_fg: Color::Rgb(229, 200, 144),
+            timestamp_fg: Color::Rgb(13, 43, 69),
+            divider_fg: Color::Rgb(13, 43, 69),
+            cmd_slash: Color::Rgb(199, 146, 234),     // Purple
+            cmd_name: Color::Rgb(201, 211, 235),
+            cmd_desc: Color::Rgb(71, 103, 145),
+            overlay_bg: Color::Rgb(11, 32, 49),
+        }
+    }
+}
+
+/// LLM Provider enum
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Provider {
+    Claude,
+    Ollama,
+    OpenAI,
+}
+
+impl Provider {
+    pub fn name(&self) -> &'static str {
+        match self {
+            Provider::Claude => "Claude",
+            Provider::Ollama => "Ollama",
+            Provider::OpenAI => "OpenAI",
+        }
+    }
+
+    pub fn all() -> &'static [Provider] {
+        &[Provider::Claude, Provider::Ollama, Provider::OpenAI]
+    }
+}
+
+/// Vim-like editing mode
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum VimMode {
+    #[default]
+    Normal,
+    Insert,
+    Visual,
+    Command,
+}
+
+impl VimMode {
+    pub fn indicator(&self, symbols: &Symbols) -> &'static str {
+        match self {
+            VimMode::Normal => symbols.mode_normal,
+            VimMode::Insert => symbols.mode_insert,
+            VimMode::Visual => symbols.mode_visual,
+            VimMode::Command => symbols.mode_command,
+        }
+    }
+}
+
+/// Theme configuration for the borderless TUI
+#[derive(Debug, Clone)]
+pub struct Theme {
+    pub palette: ColorPalette,
+    pub symbols: Symbols,
+    pub capability: TerminalCapability,
+    // Message styles
+    pub user_message: Style,
+    pub assistant_message: Style,
+    pub tool_call: Style,
+    pub tool_result_success: Style,
+    pub tool_result_error: Style,
+    pub system_message: Style,
+    pub timestamp: Style,
+    // UI element styles
+    pub divider: Style,
+    pub header: Style,
+    pub header_accent: Style,
+    pub tab_active: Style,
+    pub tab_inactive: Style,
+    pub input_prefix: Style,
+    pub input_text: Style,
+    pub input_placeholder: Style,
+    pub status_bar: Style,
+    pub status_accent: Style,
+    pub status_dim: Style,
+    // Command styles
+    pub cmd_slash: Style,         // Purple for / prefix
+    pub cmd_name: Style,          // White for command name
+    pub cmd_desc: Style,          // Dim for description
+    // Overlay/modal styles
+    pub overlay_bg: Style,        // Modal background
+    pub selection_bg: Style,      // Selected row background
+    // Popup styles (for permission dialogs)
+    pub popup_border: Style,
+    pub popup_bg: Style,
+    pub popup_title: Style,
+    pub selected: Style,
+    // Legacy compatibility
+    pub border: Style,
+    pub border_active: Style,
+    pub status_bar_highlight: Style,
+    pub input_box: Style,
+    pub input_box_active: Style,
+}
+
+impl Theme {
+    /// Create theme from color palette with automatic capability detection
+    pub fn from_palette(palette: ColorPalette) -> Self {
+        let capability = TerminalCapability::detect();
+        Self::from_palette_with_capability(palette, capability)
+    }
+
+    /// Create theme with specific terminal capability
+    pub fn from_palette_with_capability(palette: ColorPalette, capability: TerminalCapability) -> Self {
+        let symbols = Symbols::for_capability(capability);
+
+        Self {
+            // Message styles
+            user_message: Style::default()
+                .fg(palette.user_fg)
+                .add_modifier(Modifier::BOLD),
+            assistant_message: Style::default().fg(palette.assistant_fg),
+            tool_call: Style::default()
+                .fg(palette.tool_fg)
+                .add_modifier(Modifier::ITALIC),
+            tool_result_success: Style::default()
+                .fg(palette.success)
+                .add_modifier(Modifier::BOLD),
+            tool_result_error: Style::default()
+                .fg(palette.error)
+                .add_modifier(Modifier::BOLD),
+            system_message: Style::default().fg(palette.fg_dim),
+            timestamp: Style::default().fg(palette.timestamp_fg),
+            // UI elements
+            divider: Style::default().fg(palette.divider_fg),
+            header: Style::default()
+                .fg(palette.fg)
+                .add_modifier(Modifier::BOLD),
+            header_accent: Style::default()
+                .fg(palette.accent)
+                .add_modifier(Modifier::BOLD),
+            tab_active: Style::default()
+                .fg(palette.primary)
+                .add_modifier(Modifier::BOLD | Modifier::UNDERLINED),
+            tab_inactive: Style::default().fg(palette.fg_dim),
+            input_prefix: Style::default()
+                .fg(palette.accent)
+                .add_modifier(Modifier::BOLD),
+            input_text: Style::default().fg(palette.fg),
+            input_placeholder: Style::default().fg(palette.fg_muted),
+            status_bar: Style::default().fg(palette.fg_dim),
+            status_accent: Style::default().fg(palette.accent),
+            status_dim: Style::default().fg(palette.fg_muted),
+            // Command styles
+            cmd_slash: Style::default().fg(palette.cmd_slash),
+            cmd_name: Style::default().fg(palette.cmd_name),
+            cmd_desc: Style::default().fg(palette.cmd_desc),
+            // Overlay/modal styles
+            overlay_bg: Style::default().bg(palette.overlay_bg),
+            selection_bg: Style::default().bg(palette.selection),
+            // Popup styles
+            popup_border: Style::default()
+                .fg(palette.border)
+                .add_modifier(Modifier::BOLD),
+            popup_bg: Style::default().bg(palette.overlay_bg),
+            popup_title: Style::default()
+                .fg(palette.fg)
+                .add_modifier(Modifier::BOLD),
+            selected: Style::default()
+                .fg(palette.fg)
+                .bg(palette.selection)
+                .add_modifier(Modifier::BOLD),
+            // Legacy compatibility
+            border: Style::default().fg(palette.fg_dim),
+            border_active: Style::default()
+                .fg(palette.primary)
+                .add_modifier(Modifier::BOLD),
+            status_bar_highlight: Style::default()
+                .fg(palette.bg)
+                .bg(palette.accent)
+                .add_modifier(Modifier::BOLD),
+            input_box: Style::default().fg(palette.fg),
+            input_box_active: Style::default()
+                .fg(palette.accent)
+                .add_modifier(Modifier::BOLD),
+            symbols,
+            capability,
+            palette,
+        }
+    }
+
+    /// Get provider-specific color
+    pub fn provider_color(&self, provider: Provider) -> Color {
+        match provider {
+            Provider::Claude => self.palette.claude,
+            Provider::Ollama => self.palette.ollama,
+            Provider::OpenAI => self.palette.openai,
+        }
+    }
+
+    /// Get provider icon
+    pub fn provider_icon(&self, provider: Provider) -> &str {
+        match provider {
+            Provider::Claude => self.symbols.claude_icon,
+            Provider::Ollama => self.symbols.ollama_icon,
+            Provider::OpenAI => self.symbols.openai_icon,
+        }
+    }
+
+    /// Create a horizontal rule string of given width
+    pub fn horizontal_rule(&self, width: usize) -> String {
+        self.symbols.horizontal_rule.repeat(width)
+    }
+
+    /// Tokyo Night theme (default) - modern and vibrant
+    pub fn tokyo_night() -> Self {
+        Self::from_palette(ColorPalette::tokyo_night())
+    }
+
+    /// Dracula theme - classic dark theme
+    pub fn dracula() -> Self {
+        Self::from_palette(ColorPalette::dracula())
+    }
+
+    /// Catppuccin Mocha - warm and cozy
+    pub fn catppuccin() -> Self {
+        Self::from_palette(ColorPalette::catppuccin())
+    }
+
+    /// Nord theme - minimal and clean
+    pub fn nord() -> Self {
+        Self::from_palette(ColorPalette::nord())
+    }
+
+    /// Synthwave theme - vibrant retro
+    pub fn synthwave() -> Self {
+        Self::from_palette(ColorPalette::synthwave())
+    }
+
+    /// Rose Pine theme - elegant and muted
+    pub fn rose_pine() -> Self {
+        Self::from_palette(ColorPalette::rose_pine())
+    }
+
+    /// Midnight Ocean theme - deep and serene
+    pub fn midnight_ocean() -> Self {
+        Self::from_palette(ColorPalette::midnight_ocean())
+    }
+}
+
+impl Default for Theme {
+    fn default() -> Self {
+        Self::tokyo_night()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_terminal_capability_detection() {
+        let cap = TerminalCapability::detect();
+        // Should return some valid capability
+        assert!(matches!(
+            cap,
+            TerminalCapability::Full | TerminalCapability::Unicode256 | TerminalCapability::Basic
+        ));
+    }
+
+    #[test]
+    fn test_symbols_for_capability() {
+        let unicode = Symbols::for_capability(TerminalCapability::Full);
+        assert_eq!(unicode.horizontal_rule, "─");
+
+        let ascii = Symbols::for_capability(TerminalCapability::Basic);
+        assert_eq!(ascii.horizontal_rule, "-");
+    }
+
+    #[test]
+    fn test_theme_from_palette() {
+        let theme = Theme::tokyo_night();
+        assert!(theme.capability.supports_unicode() || !theme.capability.supports_unicode());
+    }
+
+    #[test]
+    fn test_provider_colors() {
+        let theme = Theme::tokyo_night();
+        let claude_color = theme.provider_color(Provider::Claude);
+        let ollama_color = theme.provider_color(Provider::Ollama);
+        assert_ne!(claude_color, ollama_color);
+    }
+
+    #[test]
+    fn test_vim_mode_indicator() {
+        let symbols = Symbols::unicode();
+        assert_eq!(VimMode::Normal.indicator(&symbols), "[N]");
+        assert_eq!(VimMode::Insert.indicator(&symbols), "[I]");
+    }
+}

crates/core/agent/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "agent-core"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+color-eyre = "0.6"
+tokio = { version = "1", features = ["full"] }
+futures-util = "0.3"
+tracing = "0.1"
+async-trait = "0.1"
+chrono = "0.4"
+
+# Internal dependencies
+llm-core = { path = "../../llm/core" }
+permissions = { path = "../../platform/permissions" }
+tools-fs = { path = "../../tools/fs" }
+tools-bash = { path = "../../tools/bash" }
+tools-ask = { path = "../../tools/ask" }
+tools-todo = { path = "../../tools/todo" }
+tools-web = { path = "../../tools/web" }
+tools-plan = { path = "../../tools/plan" }
+plugins = { path = "../../platform/plugins" }
+jsonrpc = { path = "../../integration/jsonrpc" }
+
+[dev-dependencies]
+tempfile = "3.13"

crates/core/agent/examples/git_demo.rs

@@ -0,0 +1,74 @@
+//! Example demonstrating the git integration module
+//!
+//! Run with: cargo run -p agent-core --example git_demo
+
+use agent_core::{detect_git_state, format_git_status, is_safe_git_command, is_destructive_git_command};
+use std::env;
+
+fn main() -> color_eyre::Result<()> {
+    color_eyre::install()?;
+
+    // Get current working directory
+    let cwd = env::current_dir()?;
+    println!("Detecting git state in: {}\n", cwd.display());
+
+    // Detect git state
+    let state = detect_git_state(&cwd)?;
+
+    // Display formatted status
+    println!("{}\n", format_git_status(&state));
+
+    // Show detailed file status if there are changes
+    if !state.status.is_empty() {
+        println!("Detailed file status:");
+        for status in &state.status {
+            match status {
+                agent_core::GitFileStatus::Modified { path } => {
+                    println!("  M {}", path);
+                }
+                agent_core::GitFileStatus::Added { path } => {
+                    println!("  A {}", path);
+                }
+                agent_core::GitFileStatus::Deleted { path } => {
+                    println!("  D {}", path);
+                }
+                agent_core::GitFileStatus::Renamed { from, to } => {
+                    println!("  R {} -> {}", from, to);
+                }
+                agent_core::GitFileStatus::Untracked { path } => {
+                    println!("  ? {}", path);
+                }
+            }
+        }
+        println!();
+    }
+
+    // Test command safety checking
+    println!("Command safety checks:");
+    let test_commands = vec![
+        "git status",
+        "git log --oneline",
+        "git diff HEAD",
+        "git commit -m 'test'",
+        "git push --force origin main",
+        "git reset --hard HEAD~1",
+        "git rebase main",
+        "git branch -D feature",
+    ];
+
+    for cmd in test_commands {
+        let is_safe = is_safe_git_command(cmd);
+        let (is_destructive, warning) = is_destructive_git_command(cmd);
+
+        print!("  {} - ", cmd);
+        if is_safe {
+            println!("SAFE (read-only)");
+        } else if is_destructive {
+            println!("DESTRUCTIVE: {}", warning);
+        } else {
+            println!("UNSAFE (modifies state)");
+        }
+    }
+
+    Ok(())
+}

crates/core/agent/examples/streaming_agent.rs

@@ -0,0 +1,88 @@
+//! Example demonstrating the streaming agent loop API
+//!
+//! This example shows how to use `run_agent_loop_streaming` to receive
+//! real-time events during agent execution, including:
+//! - Text deltas as the LLM generates text
+//! - Tool execution start/end events
+//! - Tool output events
+//! - Final completion events
+//!
+//! Run with: cargo run --example streaming_agent -p agent-core
+
+#[tokio::main]
+async fn main() -> color_eyre::Result<()> {
+    color_eyre::install()?;
+
+    // Note: This is a minimal example. In a real application, you would:
+    // 1. Initialize a real LLM provider (e.g., OllamaClient)
+    // 2. Configure the ChatOptions with your preferred model
+    // 3. Set up appropriate permissions and tool context
+
+    println!("=== Streaming Agent Example ===\n");
+    println!("This example demonstrates how to use the streaming agent loop API.");
+    println!("To run with a real LLM provider, modify this example to:");
+    println!("  1. Create an LLM provider instance");
+    println!("  2. Set up permissions and tool context");
+    println!("  3. Call run_agent_loop_streaming with your prompt\n");
+
+    // Example code structure:
+    println!("Example code:");
+    println!("```rust");
+    println!("// Create LLM provider");
+    println!("let provider = OllamaClient::new(\"http://localhost:11434\");");
+    println!();
+    println!("// Set up permissions and context");
+    println!("let perms = PermissionManager::new(Mode::Plan);");
+    println!("let ctx = ToolContext::default();");
+    println!();
+    println!("// Create event channel");
+    println!("let (tx, mut rx) = create_event_channel();");
+    println!();
+    println!("// Spawn agent loop");
+    println!("let handle = tokio::spawn(async move {{");
+    println!("    run_agent_loop_streaming(");
+    println!("        &provider,");
+    println!("        \"Your prompt here\",");
+    println!("        &ChatOptions::default(),");
+    println!("        &perms,");
+    println!("        &ctx,");
+    println!("        tx,");
+    println!("    ).await");
+    println!("}});");
+    println!();
+    println!("// Process events");
+    println!("while let Some(event) = rx.recv().await {{");
+    println!("    match event {{");
+    println!("        AgentEvent::TextDelta(text) => {{");
+    println!("            print!(\"{{text}}\");");
+    println!("        }}");
+    println!("        AgentEvent::ToolStart {{ tool_name, .. }} => {{");
+    println!("            println!(\"\\n[Executing tool: {{tool_name}}]\");");
+    println!("        }}");
+    println!("        AgentEvent::ToolOutput {{ content, is_error, .. }} => {{");
+    println!("            if is_error {{");
+    println!("                eprintln!(\"Error: {{content}}\");");
+    println!("            }} else {{");
+    println!("                println!(\"Output: {{content}}\");");
+    println!("            }}");
+    println!("        }}");
+    println!("        AgentEvent::ToolEnd {{ success, .. }} => {{");
+    println!("            println!(\"[Tool finished: {{}}]\", if success {{ \"success\" }} else {{ \"failed\" }});");
+    println!("        }}");
+    println!("        AgentEvent::Done {{ final_response }} => {{");
+    println!("            println!(\"\\n\\nFinal response: {{final_response}}\");");
+    println!("            break;");
+    println!("        }}");
+    println!("        AgentEvent::Error(e) => {{");
+    println!("            eprintln!(\"Error: {{e}}\");");
+    println!("            break;");
+    println!("        }}");
+    println!("    }}");
+    println!("}}");
+    println!();
+    println!("// Wait for completion");
+    println!("let result = handle.await??;");
+    println!("```");
+
+    Ok(())
+}

crates/core/agent/src/compact.rs

@@ -0,0 +1,219 @@
+//! Context compaction for long conversations.
+//!
+//! When the conversation context grows too large, this module compacts
+//! earlier messages into a summary while preserving recent context.
+
+use color_eyre::eyre::Result;
+use llm_core::{ChatMessage, ChatOptions, LlmProvider};
+
+/// Token limit threshold for triggering compaction.
+const CONTEXT_LIMIT: usize = 180_000;
+
+/// Threshold ratio at which to trigger compaction (90% of limit).
+const COMPACTION_THRESHOLD: f64 = 0.9;
+
+/// Number of recent messages to preserve during compaction.
+const PRESERVE_RECENT: usize = 10;
+
+/// Token counter for estimating the size of conversation history in tokens.
+pub struct TokenCounter {
+    chars_per_token: f64,
+}
+
+impl Default for TokenCounter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl TokenCounter {
+    /// Creates a new `TokenCounter` with default settings.
+    pub fn new() -> Self {
+        // Rough estimate: ~4 chars per token for English text
+        Self { chars_per_token: 4.0 }
+    }
+
+    /// Estimates the token count for a single message.
+    pub fn count_message(&self, message: &ChatMessage) -> usize {
+        let content_len = message.content.as_ref().map(|c| c.len()).unwrap_or(0);
+        // Add overhead for role, metadata
+        let overhead = 10;
+        ((content_len as f64 / self.chars_per_token) as usize) + overhead
+    }
+
+    /// Estimates the total token count for a list of messages.
+    pub fn count_messages(&self, messages: &[ChatMessage]) -> usize {
+        messages.iter().map(|m| self.count_message(m)).sum()
+    }
+
+    /// Determines if the conversation history should be compacted based on token limits.
+    pub fn should_compact(&self, messages: &[ChatMessage]) -> bool {
+        let count = self.count_messages(messages);
+        count > (CONTEXT_LIMIT as f64 * COMPACTION_THRESHOLD) as usize
+    }
+}
+
+/// Context compactor that uses an LLM to summarize conversation history.
+pub struct Compactor {
+    token_counter: TokenCounter,
+}
+
+impl Default for Compactor {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Compactor {
+    /// Creates a new `Compactor`.
+    pub fn new() -> Self {
+        Self {
+            token_counter: TokenCounter::new(),
+        }
+    }
+
+    /// Returns `true` if the provided messages exceed the compaction threshold.
+    pub fn needs_compaction(&self, messages: &[ChatMessage]) -> bool {
+        self.token_counter.should_compact(messages)
+    }
+
+    /// Compacts conversation history by summarizing earlier messages.
+    ///
+    /// The resulting message list will contain a summary system message followed
+    /// by the most recent conversation context.
+    pub async fn compact<P: LlmProvider>(
+        &self,
+        provider: &P,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+    ) -> Result<Vec<ChatMessage>> {
+        // If not enough messages to compact, return as-is
+        if messages.len() <= PRESERVE_RECENT + 1 {
+            return Ok(messages.to_vec());
+        }
+
+        // Split into messages to summarize and messages to preserve
+        let split_point = messages.len().saturating_sub(PRESERVE_RECENT);
+        let to_summarize = &messages[..split_point];
+        let to_preserve = &messages[split_point..];
+
+        // Generate summary of earlier messages
+        let summary = self.summarize_messages(provider, to_summarize, options).await?;
+
+        // Build compacted message list
+        let mut compacted = Vec::with_capacity(PRESERVE_RECENT + 1);
+
+        // Add system message with summary
+        compacted.push(ChatMessage::system(format!(
+            "## Earlier Conversation Summary\n\n{}\n\n---\n\n\
+            The above summarizes the earlier part of this conversation. \
+            Continue from the recent messages below.",
+            summary
+        )));
+
+        // Add preserved recent messages
+        compacted.extend(to_preserve.iter().cloned());
+
+        Ok(compacted)
+    }
+
+    /// Generate a summary of messages using the LLM
+    async fn summarize_messages<P: LlmProvider>(
+        &self,
+        provider: &P,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+    ) -> Result<String> {
+        // Format messages for summarization
+        let mut context = String::new();
+        for msg in messages {
+            let role = &msg.role;
+            let content = msg.content.as_deref().unwrap_or("");
+            context.push_str(&format!("[{:?}]: {}\n\n", role, content));
+        }
+
+        // Create summarization prompt
+        let summary_prompt = format!(
+            "Please provide a concise summary of the following conversation. \
+            Focus on:\n\
+            1. Key decisions made\n\
+            2. Important files or code mentioned\n\
+            3. Tasks completed and their outcomes\n\
+            4. Any pending items or next steps discussed\n\n\
+            Keep the summary informative but brief (under 500 words).\n\n\
+            Conversation:\n{}\n\n\
+            Summary:",
+            context
+        );
+
+        // Call LLM to generate summary
+        let summary_options = ChatOptions {
+            model: options.model.clone(),
+            max_tokens: Some(1000),
+            temperature: Some(0.3), // Lower temperature for more focused summary
+            ..Default::default()
+        };
+
+        let summary_messages = vec![ChatMessage::user(&summary_prompt)];
+        let mut stream = provider.chat_stream(&summary_messages, &summary_options, None).await?;
+
+        let mut summary = String::new();
+        use futures_util::StreamExt;
+        while let Some(chunk_result) = stream.next().await {
+            if let Ok(chunk) = chunk_result
+                && let Some(content) = &chunk.content
+            {
+                summary.push_str(content);
+            }
+        }
+
+        Ok(summary.trim().to_string())
+    }
+
+    /// Returns a reference to the internal `TokenCounter`.
+    pub fn token_counter(&self) -> &TokenCounter {
+        &self.token_counter
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_token_counter_estimate() {
+        let counter = TokenCounter::new();
+        let msg = ChatMessage::user("Hello, world!");
+        let count = counter.count_message(&msg);
+        // Should be approximately 13/4 + 10 overhead = 13
+        assert!(count > 10);
+        assert!(count < 20);
+    }
+
+    #[test]
+    fn test_should_compact() {
+        let counter = TokenCounter::new();
+
+        // Small message list shouldn't compact
+        let small_messages: Vec<ChatMessage> = (0..10)
+            .map(|i| ChatMessage::user(format!("Message {}", i)))
+            .collect();
+        assert!(!counter.should_compact(&small_messages));
+
+        // Large message list should compact
+        // Need ~162,000 tokens = ~648,000 chars (at 4 chars per token)
+        let large_content = "x".repeat(700_000);
+        let large_messages = vec![ChatMessage::user(large_content)];
+        assert!(counter.should_compact(&large_messages));
+    }
+
+    #[test]
+    fn test_compactor_needs_compaction() {
+        let compactor = Compactor::new();
+
+        let small: Vec<ChatMessage> = (0..5)
+            .map(|i| ChatMessage::user(format!("Short message {}", i)))
+            .collect();
+        assert!(!compactor.needs_compaction(&small));
+    }
+}

crates/core/agent/src/git.rs

@@ -0,0 +1,546 @@
+//! Git integration module for detecting repository state and validating git commands.
+//!
+//! This module provides functionality to:
+//! - Detect if the current directory is a git repository
+//! - Capture git repository state (branch, status, uncommitted changes)
+//! - Validate git commands for safety (read-only vs destructive operations)
+
+use color_eyre::eyre::Result;
+use std::path::Path;
+use std::process::Command;
+
+/// Represents the git status of a specific file.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum GitFileStatus {
+    /// File has been modified.
+    Modified { path: String },
+    /// File has been added to the index (staged).
+    Added { path: String },
+    /// File has been deleted.
+    Deleted { path: String },
+    /// File has been renamed.
+    Renamed { from: String, to: String },
+    /// File is not tracked by git.
+    Untracked { path: String },
+}
+
+impl GitFileStatus {
+    /// Returns the primary path associated with this status entry.
+    ///
+    /// For renames, this returns the new path.
+    pub fn path(&self) -> &str {
+        match self {
+            Self::Modified { path } => path,
+            Self::Added { path } => path,
+            Self::Deleted { path } => path,
+            Self::Renamed { to, .. } => to,
+            Self::Untracked { path } => path,
+        }
+    }
+}
+
+/// Represents the captured state of a git repository.
+#[derive(Debug, Clone)]
+pub struct GitState {
+    /// `true` if the directory is a git repository.
+    pub is_git_repo: bool,
+    /// The name of the current branch, if any.
+    pub current_branch: Option<String>,
+    /// The name of the detected main/master branch.
+    pub main_branch: Option<String>,
+    /// List of file status entries for the working tree.
+    pub status: Vec<GitFileStatus>,
+    /// `true` if there are any staged or unstaged changes.
+    pub has_uncommitted_changes: bool,
+    /// The URL of the 'origin' remote, if configured.
+    pub remote_url: Option<String>,
+}
+
+impl GitState {
+    /// Creates a `GitState` representing a non-repository directory.
+    pub fn not_a_repo() -> Self {
+        Self {
+            is_git_repo: false,
+            current_branch: None,
+            main_branch: None,
+            status: Vec::new(),
+            has_uncommitted_changes: false,
+            remote_url: None,
+        }
+    }
+}
+
+/// Detects the git state of the specified working directory.
+///
+/// This function executes git commands to inspect the repository. It handles cases
+/// where git is missing or the directory is not a repository by returning a
+/// "not a repo" state rather than an error.
+pub fn detect_git_state(working_dir: &Path) -> Result<GitState> {
+    // Check if this is a git repository
+    let is_repo = Command::new("git")
+        .arg("rev-parse")
+        .arg("--git-dir")
+        .current_dir(working_dir)
+        .output()
+        .map(|output| output.status.success())
+        .unwrap_or(false);
+
+    if !is_repo {
+        return Ok(GitState::not_a_repo());
+    }
+
+    // Get current branch
+    let current_branch = get_current_branch(working_dir)?;
+
+    // Detect main branch (try main first, then master)
+    let main_branch = detect_main_branch(working_dir)?;
+
+    // Get file status
+    let status = get_git_status(working_dir)?;
+
+    // Check if there are uncommitted changes
+    let has_uncommitted_changes = !status.is_empty();
+
+    // Get remote URL
+    let remote_url = get_remote_url(working_dir)?;
+
+    Ok(GitState {
+        is_git_repo: true,
+        current_branch,
+        main_branch,
+        status,
+        has_uncommitted_changes,
+        remote_url,
+    })
+}
+
+/// Get the current branch name
+fn get_current_branch(working_dir: &Path) -> Result<Option<String>> {
+    let output = Command::new("git")
+        .arg("rev-parse")
+        .arg("--abbrev-ref")
+        .arg("HEAD")
+        .current_dir(working_dir)
+        .output()?;
+
+    if !output.status.success() {
+        return Ok(None);
+    }
+
+    let branch = String::from_utf8_lossy(&output.stdout).trim().to_string();
+
+    // "HEAD" means detached HEAD state
+    if branch == "HEAD" {
+        Ok(None)
+    } else {
+        Ok(Some(branch))
+    }
+}
+
+/// Detect the main branch (main or master)
+fn detect_main_branch(working_dir: &Path) -> Result<Option<String>> {
+    // Try to get all branches
+    let output = Command::new("git")
+        .arg("branch")
+        .arg("-a")
+        .current_dir(working_dir)
+        .output()?;
+
+    if !output.status.success() {
+        return Ok(None);
+    }
+
+    let branches = String::from_utf8_lossy(&output.stdout);
+
+    // Check for main branch first (modern convention)
+    if branches.lines().any(|line| {
+        let trimmed = line.trim_start_matches('*').trim();
+        trimmed == "main" || trimmed.ends_with("/main")
+    }) {
+        return Ok(Some("main".to_string()));
+    }
+
+    // Fall back to master
+    if branches.lines().any(|line| {
+        let trimmed = line.trim_start_matches('*').trim();
+        trimmed == "master" || trimmed.ends_with("/master")
+    }) {
+        return Ok(Some("master".to_string()));
+    }
+
+    Ok(None)
+}
+
+/// Get the git status for all files
+fn get_git_status(working_dir: &Path) -> Result<Vec<GitFileStatus>> {
+    let output = Command::new("git")
+        .arg("status")
+        .arg("--porcelain")
+        .arg("-z") // Null-terminated for better parsing
+        .current_dir(working_dir)
+        .output()?;
+
+    if !output.status.success() {
+        return Ok(Vec::new());
+    }
+
+    let status_text = String::from_utf8_lossy(&output.stdout);
+    let mut statuses = Vec::new();
+
+    // Parse porcelain format with null termination
+    // Format: XY filename\0 (where X is staged status, Y is unstaged status)
+    for entry in status_text.split('\0').filter(|s| !s.is_empty()) {
+        if entry.len() < 3 {
+            continue;
+        }
+
+        let status_code = &entry[0..2];
+        let path = entry[3..].to_string();
+
+        // Parse status codes
+        match status_code {
+            "M " | " M" | "MM" => {
+                statuses.push(GitFileStatus::Modified { path });
+            }
+            "A " | " A" | "AM" => {
+                statuses.push(GitFileStatus::Added { path });
+            }
+            "D " | " D" | "AD" => {
+                statuses.push(GitFileStatus::Deleted { path });
+            }
+            "??" => {
+                statuses.push(GitFileStatus::Untracked { path });
+            }
+            s if s.starts_with('R') => {
+                // Renamed files have format "R  old_name -> new_name"
+                if let Some((from, to)) = path.split_once(" -> ") {
+                    statuses.push(GitFileStatus::Renamed {
+                        from: from.to_string(),
+                        to: to.to_string(),
+                    });
+                } else {
+                    // Fallback if parsing fails
+                    statuses.push(GitFileStatus::Modified { path });
+                }
+            }
+            _ => {
+                // Unknown status code, treat as modified
+                statuses.push(GitFileStatus::Modified { path });
+            }
+        }
+    }
+
+    Ok(statuses)
+}
+
+/// Get the remote URL for the repository
+fn get_remote_url(working_dir: &Path) -> Result<Option<String>> {
+    let output = Command::new("git")
+        .arg("remote")
+        .arg("get-url")
+        .arg("origin")
+        .current_dir(working_dir)
+        .output()?;
+
+    if !output.status.success() {
+        return Ok(None);
+    }
+
+    let url = String::from_utf8_lossy(&output.stdout).trim().to_string();
+
+    if url.is_empty() {
+        Ok(None)
+    } else {
+        Ok(Some(url))
+    }
+}
+
+/// Heuristically determines if a git command string is "safe" (read-only).
+///
+/// Safe commands (like `status` or `diff`) are generally allowed without
+/// explicit confirmation in certain modes.
+pub fn is_safe_git_command(command: &str) -> bool {
+    let parts: Vec<&str> = command.split_whitespace().collect();
+
+    if parts.is_empty() || parts[0] != "git" {
+        return false;
+    }
+
+    if parts.len() < 2 {
+        return false;
+    }
+
+    let subcommand = parts[1];
+
+    // List of read-only git commands
+    match subcommand {
+        "status" | "log" | "show" | "diff" | "blame" | "reflog" => true,
+        "ls-files" | "ls-tree" | "ls-remote" => true,
+        "rev-parse" | "rev-list" => true,
+        "describe" | "tag" if !command.contains("-d") && !command.contains("--delete") => true,
+        "branch" if !command.contains("-D") && !command.contains("-d") && !command.contains("-m") => true,
+        "remote" if command.contains("get-url") || command.contains("-v") || command.contains("show") => true,
+        "config" if command.contains("--get") || command.contains("--list") => true,
+        "grep" | "shortlog" | "whatchanged" => true,
+        "fetch" if !command.contains("--prune") => true,
+        _ => false,
+    }
+}
+
+/// Heuristically determines if a git command is "destructive" or potentially dangerous.
+///
+/// Returns a tuple of `(is_destructive, warning_message)`. Destructive commands
+/// (like `reset --hard` or `push --force`) should always trigger a warning or
+/// require explicit approval.
+pub fn is_destructive_git_command(command: &str) -> (bool, &'static str) {
+    let cmd_lower = command.to_lowercase();
+
+    // Check for force push
+    if cmd_lower.contains("push") && (cmd_lower.contains("--force") || cmd_lower.contains("-f")) {
+        return (true, "Force push can overwrite remote history and affect other collaborators");
+    }
+
+    // Check for hard reset
+    if cmd_lower.contains("reset") && cmd_lower.contains("--hard") {
+        return (true, "Hard reset will discard uncommitted changes permanently");
+    }
+
+    // Check for git clean
+    if cmd_lower.contains("clean") && (cmd_lower.contains("-f") || cmd_lower.contains("-d")) {
+        return (true, "Git clean will permanently delete untracked files");
+    }
+
+    // Check for rebase
+    if cmd_lower.contains("rebase") {
+        return (true, "Rebase rewrites commit history and can cause conflicts");
+    }
+
+    // Check for amend
+    if cmd_lower.contains("commit") && cmd_lower.contains("--amend") {
+        return (true, "Amending rewrites the last commit and changes its hash");
+    }
+
+    // Check for filter-branch or filter-repo
+    if cmd_lower.contains("filter-branch") || cmd_lower.contains("filter-repo") {
+        return (true, "Filter operations rewrite repository history");
+    }
+
+    // Check for branch/tag deletion
+    if (cmd_lower.contains("branch") && (cmd_lower.contains("-D") || cmd_lower.contains("-d")))
+        || (cmd_lower.contains("tag") && (cmd_lower.contains("-d") || cmd_lower.contains("--delete")))
+    {
+        return (true, "This will delete a branch or tag");
+    }
+
+    // Check for reflog expire
+    if cmd_lower.contains("reflog") && cmd_lower.contains("expire") {
+        return (true, "Expiring reflog removes recovery points for lost commits");
+    }
+
+    // Check for gc with aggressive or prune
+    if cmd_lower.contains("gc") && (cmd_lower.contains("--aggressive") || cmd_lower.contains("--prune")) {
+        return (true, "Aggressive garbage collection can make recovery difficult");
+    }
+
+    (false, "")
+}
+
+/// Formats a `GitState` into a human-readable summary string.
+pub fn format_git_status(state: &GitState) -> String {
+    if !state.is_git_repo {
+        return "Not a git repository".to_string();
+    }
+
+    let mut lines = Vec::new();
+
+    lines.push("Git Repository: yes".to_string());
+
+    if let Some(branch) = &state.current_branch {
+        lines.push(format!("Current branch: {}", branch));
+    } else {
+        lines.push("Current branch: (detached HEAD)".to_string());
+    }
+
+    if let Some(main) = &state.main_branch {
+        lines.push(format!("Main branch: {}", main));
+    }
+
+    // Summarize status
+    if state.status.is_empty() {
+        lines.push("Status: clean working tree".to_string());
+    } else {
+        let mut modified = 0;
+        let mut added = 0;
+        let mut deleted = 0;
+        let mut renamed = 0;
+        let mut untracked = 0;
+
+        for status in &state.status {
+            match status {
+                GitFileStatus::Modified { .. } => modified += 1,
+                GitFileStatus::Added { .. } => added += 1,
+                GitFileStatus::Deleted { .. } => deleted += 1,
+                GitFileStatus::Renamed { .. } => renamed += 1,
+                GitFileStatus::Untracked { .. } => untracked += 1,
+            }
+        }
+
+        let mut status_parts = Vec::new();
+        if modified > 0 {
+            status_parts.push(format!("{} modified", modified));
+        }
+        if added > 0 {
+            status_parts.push(format!("{} added", added));
+        }
+        if deleted > 0 {
+            status_parts.push(format!("{} deleted", deleted));
+        }
+        if renamed > 0 {
+            status_parts.push(format!("{} renamed", renamed));
+        }
+        if untracked > 0 {
+            status_parts.push(format!("{} untracked", untracked));
+        }
+
+        lines.push(format!("Status: {}", status_parts.join(", ")));
+    }
+
+    if let Some(url) = &state.remote_url {
+        lines.push(format!("Remote: {}", url));
+    } else {
+        lines.push("Remote: (none)".to_string());
+    }
+
+    lines.join("\n")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_is_safe_git_command() {
+        // Safe commands
+        assert!(is_safe_git_command("git status"));
+        assert!(is_safe_git_command("git log --oneline"));
+        assert!(is_safe_git_command("git diff HEAD"));
+        assert!(is_safe_git_command("git branch -v"));
+        assert!(is_safe_git_command("git remote -v"));
+        assert!(is_safe_git_command("git config --get user.name"));
+
+        // Unsafe commands
+        assert!(!is_safe_git_command("git commit -m test"));
+        assert!(!is_safe_git_command("git push origin main"));
+        assert!(!is_safe_git_command("git branch -D feature"));
+        assert!(!is_safe_git_command("git remote add origin url"));
+    }
+
+    #[test]
+    fn test_is_destructive_git_command() {
+        // Destructive commands
+        let (is_dest, msg) = is_destructive_git_command("git push --force origin main");
+        assert!(is_dest);
+        assert!(msg.contains("Force push"));
+
+        let (is_dest, msg) = is_destructive_git_command("git reset --hard HEAD~1");
+        assert!(is_dest);
+        assert!(msg.contains("Hard reset"));
+
+        let (is_dest, msg) = is_destructive_git_command("git clean -fd");
+        assert!(is_dest);
+        assert!(msg.contains("clean"));
+
+        let (is_dest, msg) = is_destructive_git_command("git rebase main");
+        assert!(is_dest);
+        assert!(msg.contains("Rebase"));
+
+        let (is_dest, msg) = is_destructive_git_command("git commit --amend");
+        assert!(is_dest);
+        assert!(msg.contains("Amending"));
+
+        // Non-destructive commands
+        let (is_dest, _) = is_destructive_git_command("git status");
+        assert!(!is_dest);
+
+        let (is_dest, _) = is_destructive_git_command("git log");
+        assert!(!is_dest);
+
+        let (is_dest, _) = is_destructive_git_command("git diff");
+        assert!(!is_dest);
+    }
+
+    #[test]
+    fn test_git_state_not_a_repo() {
+        let state = GitState::not_a_repo();
+        assert!(!state.is_git_repo);
+        assert!(state.current_branch.is_none());
+        assert!(state.main_branch.is_none());
+        assert!(state.status.is_empty());
+        assert!(!state.has_uncommitted_changes);
+        assert!(state.remote_url.is_none());
+    }
+
+    #[test]
+    fn test_git_file_status_path() {
+        let status = GitFileStatus::Modified {
+            path: "test.rs".to_string(),
+        };
+        assert_eq!(status.path(), "test.rs");
+
+        let status = GitFileStatus::Renamed {
+            from: "old.rs".to_string(),
+            to: "new.rs".to_string(),
+        };
+        assert_eq!(status.path(), "new.rs");
+    }
+
+    #[test]
+    fn test_format_git_status_not_repo() {
+        let state = GitState::not_a_repo();
+        let formatted = format_git_status(&state);
+        assert_eq!(formatted, "Not a git repository");
+    }
+
+    #[test]
+    fn test_format_git_status_clean() {
+        let state = GitState {
+            is_git_repo: true,
+            current_branch: Some("main".to_string()),
+            main_branch: Some("main".to_string()),
+            status: Vec::new(),
+            has_uncommitted_changes: false,
+            remote_url: Some("https://github.com/user/repo.git".to_string()),
+        };
+
+        let formatted = format_git_status(&state);
+        assert!(formatted.contains("Git Repository: yes"));
+        assert!(formatted.contains("Current branch: main"));
+        assert!(formatted.contains("clean working tree"));
+    }
+
+    #[test]
+    fn test_format_git_status_with_changes() {
+        let state = GitState {
+            is_git_repo: true,
+            current_branch: Some("feature".to_string()),
+            main_branch: Some("main".to_string()),
+            status: vec![
+                GitFileStatus::Modified {
+                    path: "file1.rs".to_string(),
+                },
+                GitFileStatus::Modified {
+                    path: "file2.rs".to_string(),
+                },
+                GitFileStatus::Untracked {
+                    path: "new.rs".to_string(),
+                },
+            ],
+            has_uncommitted_changes: true,
+            remote_url: None,
+        };
+
+        let formatted = format_git_status(&state);
+        assert!(formatted.contains("2 modified"));
+        assert!(formatted.contains("1 untracked"));
+    }
+}

crates/core/agent/src/messages.rs

@@ -0,0 +1,110 @@
+use serde::{Deserialize, Serialize};
+use tools_plan::{PlanStep, AccumulatedPlanStatus, PlanApproval};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum Message {
+    UserAction(UserAction),
+    AgentResponse(AgentResponse),
+    System(SystemNotification),
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum UserAction {
+    /// User typed a message
+    Input(String),
+    /// User issued a command
+    Command(String),
+    /// User responded to a permission request
+    PermissionResult(bool),
+    /// Exit the application
+    Exit,
+    // Plan mode actions
+    /// Stop accumulating steps, enter review mode
+    FinalizePlan,
+    /// User's approval/rejection of plan steps
+    PlanApproval(PlanApproval),
+    /// Save the current plan with a name
+    SavePlan(String),
+    /// Load a saved plan by ID
+    LoadPlan(String),
+    /// Cancel the current plan
+    CancelPlan,
+    // Provider switching
+    /// Switch to a different provider (ollama, anthropic, openai)
+    SwitchProvider(String),
+    /// Switch to a different model for the current provider
+    SwitchModel(String),
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum AgentResponse {
+    /// Streaming text token from LLM
+    Token(String),
+    /// Tool call being executed
+    ToolCall { name: String, args: String },
+    /// Permission needed for a tool
+    PermissionRequest { tool: String, context: Option<String> },
+    /// Legacy: batch staging (deprecated, use PlanStepAdded)
+    PlanStaging(Vec<ToolCallStaging>),
+    /// Agent done responding
+    Complete,
+    /// Error occurred
+    Error(String),
+    // Plan mode responses
+    /// A new step was added to the accumulated plan
+    PlanStepAdded(PlanStep),
+    /// Agent finished proposing steps (in plan mode)
+    PlanComplete {
+        total_steps: usize,
+        status: AccumulatedPlanStatus,
+    },
+    /// A step is currently being executed
+    PlanExecuting {
+        step_id: String,
+        step_index: usize,
+        total_steps: usize,
+    },
+    /// Plan execution finished
+    PlanExecutionComplete {
+        executed: usize,
+        skipped: usize,
+    },
+}
+
+/// Legacy tool call staging (for backward compatibility)
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolCallStaging {
+    pub id: String,
+    pub name: String,
+    pub args: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum SystemNotification {
+    StateUpdate(String),
+    Warning(String),
+    /// Plan was saved successfully
+    PlanSaved { id: String, path: String },
+    /// Plan was loaded successfully
+    PlanLoaded { id: String, name: Option<String>, steps: usize },
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use tokio::sync::mpsc;
+
+    #[tokio::test]
+    async fn test_message_channel() {
+        let (tx, mut rx) = mpsc::channel(32);
+
+        let msg = Message::UserAction(UserAction::Input("Hello".to_string()));
+        tx.send(msg).await.unwrap();
+
+        let received = rx.recv().await.unwrap();
+        match received {
+            Message::UserAction(UserAction::Input(s)) => assert_eq!(s, "Hello"),
+            _ => panic!("Wrong message type"),
+        }
+    }
+}

crates/core/agent/src/session.rs

@@ -0,0 +1,393 @@
+//! Session state and history management.
+//!
+//! This module provides tools for tracking conversation history, capturing
+//! usage statistics, and managing session checkpoints for persistence and rewind.
+
+use color_eyre::eyre::{Result, eyre};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::time::{Duration, SystemTime};
+
+/// Statistics for a single chat session.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SessionStats {
+    /// The time when the session started.
+    pub start_time: SystemTime,
+    /// Total number of messages exchanged.
+    pub total_messages: usize,
+    /// Total number of tools executed by the agent.
+    pub total_tool_calls: usize,
+    /// Total wall-clock time spent in the session.
+    pub total_duration: Duration,
+    /// Rough estimate of the total tokens used.
+    pub estimated_tokens: usize,
+}
+
+impl SessionStats {
+    /// Creates a new `SessionStats` instance with zeroed values.
+    pub fn new() -> Self {
+        Self {
+            start_time: SystemTime::now(),
+            total_messages: 0,
+            total_tool_calls: 0,
+            total_duration: Duration::ZERO,
+            estimated_tokens: 0,
+        }
+    }
+
+    /// Records a new message in the statistics.
+    pub fn record_message(&mut self, tokens: usize, duration: Duration) {
+        self.total_messages += 1;
+        self.estimated_tokens += tokens;
+        self.total_duration += duration;
+    }
+
+    /// Increments the tool call counter.
+    pub fn record_tool_call(&mut self) {
+        self.total_tool_calls += 1;
+    }
+
+    /// Formats a duration into a human-readable string.
+    pub fn format_duration(d: Duration) -> String {
+        let secs = d.as_secs();
+        if secs < 60 {
+            format!("{}s", secs)
+        } else if secs < 3600 {
+            format!("{}m {}s", secs / 60, secs % 60)
+        } else {
+            format!("{}h {}m", secs / 3600, (secs % 3600) / 60)
+        }
+    }
+}
+
+impl Default for SessionStats {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// In-memory history of the current session.
+#[derive(Debug, Clone)]
+pub struct SessionHistory {
+    /// List of prompts provided by the user.
+    pub user_prompts: Vec<String>,
+    /// List of responses generated by the assistant.
+    pub assistant_responses: Vec<String>,
+    /// Chronological log of all tool calls made.
+    pub tool_calls: Vec<ToolCallRecord>,
+}
+
+/// Record of a single tool execution.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolCallRecord {
+    /// Name of the tool that was called.
+    pub tool_name: String,
+    /// JSON-encoded arguments provided to the tool.
+    pub arguments: String,
+    /// Output produced by the tool.
+    pub result: String,
+    /// Whether the tool execution was successful.
+    pub success: bool,
+}
+
+impl SessionHistory {
+    /// Creates a new, empty `SessionHistory`.
+    pub fn new() -> Self {
+        Self {
+            user_prompts: Vec::new(),
+            assistant_responses: Vec::new(),
+            tool_calls: Vec::new(),
+        }
+    }
+
+    /// Appends a user message to history.
+    pub fn add_user_message(&mut self, message: String) {
+        self.user_prompts.push(message);
+    }
+
+    /// Appends an assistant response to history.
+    pub fn add_assistant_message(&mut self, message: String) {
+        self.assistant_responses.push(message);
+    }
+
+    /// Appends a tool call record to history.
+    pub fn add_tool_call(&mut self, record: ToolCallRecord) {
+        self.tool_calls.push(record);
+    }
+
+    /// Clears all stored history.
+    pub fn clear(&mut self) {
+        self.user_prompts.clear();
+        self.assistant_responses.clear();
+        self.tool_calls.clear();
+    }
+}
+
+impl Default for SessionHistory {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Represents a file modification with before/after content.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FileDiff {
+    /// Absolute path to the file.
+    pub path: PathBuf,
+    /// Content of the file before modification.
+    pub before: String,
+    /// Content of the file after modification.
+    pub after: String,
+    /// When the modification occurred.
+    pub timestamp: SystemTime,
+}
+
+impl FileDiff {
+    /// Creates a new `FileDiff`.
+    pub fn new(path: PathBuf, before: String, after: String) -> Self {
+        Self {
+            path,
+            before,
+            after,
+            timestamp: SystemTime::now(),
+        }
+    }
+}
+
+/// A checkpoint captures the full state of a session at a point in time.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Checkpoint {
+    /// Unique identifier for the checkpoint.
+    pub id: String,
+    /// When the checkpoint was created.
+    pub timestamp: SystemTime,
+    /// Session statistics at the time of checkpoint.
+    pub stats: SessionStats,
+    /// History of user prompts.
+    pub user_prompts: Vec<String>,
+    /// History of assistant responses.
+    pub assistant_responses: Vec<String>,
+    /// History of tool calls.
+    pub tool_calls: Vec<ToolCallRecord>,
+    /// List of file modifications made during the session.
+    pub file_diffs: Vec<FileDiff>,
+}
+
+impl Checkpoint {
+    /// Creates a new checkpoint from the current session state.
+    pub fn new(
+        id: String,
+        stats: SessionStats,
+        history: &SessionHistory,
+        file_diffs: Vec<FileDiff>,
+    ) -> Self {
+        Self {
+            id,
+            timestamp: SystemTime::now(),
+            stats,
+            user_prompts: history.user_prompts.clone(),
+            assistant_responses: history.assistant_responses.clone(),
+            tool_calls: history.tool_calls.clone(),
+            file_diffs,
+        }
+    }
+
+    /// Saves the checkpoint to a JSON file on disk.
+    pub fn save(&self, checkpoint_dir: &Path) -> Result<()> {
+        fs::create_dir_all(checkpoint_dir)?;
+        let path = checkpoint_dir.join(format!("{}.json", self.id));
+        let content = serde_json::to_string_pretty(self)?;
+        fs::write(path, content)?;
+        Ok(())
+    }
+
+    /// Loads a checkpoint from disk by ID.
+    pub fn load(checkpoint_dir: &Path, id: &str) -> Result<Self> {
+        let path = checkpoint_dir.join(format!("{}.json", id));
+        let content = fs::read_to_string(&path)
+            .map_err(|e| eyre!("Failed to read checkpoint: {}", e))?;
+        let checkpoint: Checkpoint = serde_json::from_str(&content)
+            .map_err(|e| eyre!("Failed to parse checkpoint: {}", e))?;
+        Ok(checkpoint)
+    }
+
+    /// Lists all available checkpoint IDs in the given directory.
+    pub fn list(checkpoint_dir: &Path) -> Result<Vec<String>> {
+        if !checkpoint_dir.exists() {
+            return Ok(Vec::new());
+        }
+
+        let mut checkpoints = Vec::new();
+        for entry in fs::read_dir(checkpoint_dir)? {
+            let entry = entry?;
+            let path = entry.path();
+            if path.extension().and_then(|s| s.to_str()) == Some("json")
+                && let Some(stem) = path.file_stem().and_then(|s| s.to_str())
+            {
+                checkpoints.push(stem.to_string());
+            }
+        }
+
+        // Sort by checkpoint ID (which includes timestamp)
+        checkpoints.sort();
+        Ok(checkpoints)
+    }
+}
+
+/// Manages the creation and restoration of session checkpoints.
+pub struct CheckpointManager {
+    checkpoint_dir: PathBuf,
+    file_snapshots: HashMap<PathBuf, String>,
+}
+
+impl CheckpointManager {
+    /// Creates a new `CheckpointManager` pointing to the specified directory.
+    pub fn new(checkpoint_dir: PathBuf) -> Self {
+        Self {
+            checkpoint_dir,
+            file_snapshots: HashMap::new(),
+        }
+    }
+
+    /// Snapshots a file's current content before modification to track changes.
+    pub fn snapshot_file(&mut self, path: &Path) -> Result<()> {
+        if !self.file_snapshots.contains_key(path) {
+            let content = fs::read_to_string(path).unwrap_or_default();
+            self.file_snapshots.insert(path.to_path_buf(), content);
+        }
+        Ok(())
+    }
+
+    /// Creates a `FileDiff` if the file has been modified since it was snapshotted.
+    pub fn create_diff(&self, path: &Path) -> Result<Option<FileDiff>> {
+        if let Some(before) = self.file_snapshots.get(path) {
+            let after = fs::read_to_string(path).unwrap_or_default();
+            if before != &after {
+                Ok(Some(FileDiff::new(
+                    path.to_path_buf(),
+                    before.clone(),
+                    after,
+                )))
+            } else {
+                Ok(None)
+            }
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Returns all file modifications tracked since the last checkpoint.
+    pub fn get_all_diffs(&self) -> Result<Vec<FileDiff>> {
+        let mut diffs = Vec::new();
+        for (path, before) in &self.file_snapshots {
+            let after = fs::read_to_string(path).unwrap_or_default();
+            if before != &after {
+                diffs.push(FileDiff::new(path.clone(), before.clone(), after));
+            }
+        }
+        Ok(diffs)
+    }
+
+    /// Clears all internal file snapshots.
+    pub fn clear_snapshots(&mut self) {
+        self.file_snapshots.clear();
+    }
+
+    /// Saves the current session state as a new checkpoint.
+    pub fn save_checkpoint(
+        &mut self,
+        id: String,
+        stats: SessionStats,
+        history: &SessionHistory,
+    ) -> Result<Checkpoint> {
+        let file_diffs = self.get_all_diffs()?;
+        let checkpoint = Checkpoint::new(id, stats, history, file_diffs);
+        checkpoint.save(&self.checkpoint_dir)?;
+        self.clear_snapshots();
+        Ok(checkpoint)
+    }
+
+    /// Loads a checkpoint by ID.
+    pub fn load_checkpoint(&self, id: &str) -> Result<Checkpoint> {
+        Checkpoint::load(&self.checkpoint_dir, id)
+    }
+
+    /// Lists all available checkpoints.
+    pub fn list_checkpoints(&self) -> Result<Vec<String>> {
+        Checkpoint::list(&self.checkpoint_dir)
+    }
+
+    /// Rewinds the local filesystem to the state captured in the specified checkpoint.
+    ///
+    /// Returns a list of paths that were restored.
+    pub fn rewind_to(&self, checkpoint_id: &str) -> Result<Vec<PathBuf>> {
+        let checkpoint = self.load_checkpoint(checkpoint_id)?;
+        let mut restored_files = Vec::new();
+
+        // Restore files from diffs (revert to 'before' state)
+        for diff in &checkpoint.file_diffs {
+            fs::write(&diff.path, &diff.before)?;
+            restored_files.push(diff.path.clone());
+        }
+
+        Ok(restored_files)
+    }
+}
+
+/// Helper to accumulate streaming tool call deltas
+#[derive(Default)]
+pub struct ToolCallsBuilder {
+    calls: Vec<PartialToolCallBuilder>,
+}
+
+#[derive(Default)]
+struct PartialToolCallBuilder {
+    id: Option<String>,
+    name: Option<String>,
+    arguments: String,
+}
+
+impl ToolCallsBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn add_deltas(&mut self, deltas: &[llm_core::ToolCallDelta]) {
+        for delta in deltas {
+            while self.calls.len() <= delta.index {
+                self.calls.push(PartialToolCallBuilder::default());
+            }
+            let call = &mut self.calls[delta.index];
+            if let Some(id) = &delta.id {
+                call.id = Some(id.clone());
+            }
+            if let Some(name) = &delta.function_name {
+                call.name = Some(name.clone());
+            }
+            if let Some(args) = &delta.arguments_delta {
+                call.arguments.push_str(args);
+            }
+        }
+    }
+
+    pub fn build(self) -> Vec<llm_core::ToolCall> {
+        self.calls
+            .into_iter()
+            .filter_map(|p| {
+                let id = p.id?;
+                let name = p.name?;
+                let args: serde_json::Value = serde_json::from_str(&p.arguments).ok()?;
+                Some(llm_core::ToolCall {
+                    id,
+                    call_type: "function".to_string(),
+                    function: llm_core::FunctionCall {
+                        name,
+                        arguments: args,
+                    },
+                })
+            })
+            .collect()
+    }
+}

crates/core/agent/src/state.rs

@@ -0,0 +1,128 @@
+use std::sync::Arc;
+use tokio::sync::{Mutex, Notify};
+use llm_core::ChatMessage;
+use serde::{Deserialize, Serialize};
+use tools_plan::{AccumulatedPlan, PlanApproval};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum AppMode {
+    Normal,
+    Plan,
+    AcceptAll,
+}
+
+impl Default for AppMode {
+    fn default() -> Self {
+        Self::Normal
+    }
+}
+
+/// Shared application state
+#[derive(Debug)]
+pub struct AppState {
+    /// Conversation history
+    pub messages: Vec<ChatMessage>,
+    /// Whether the application is running
+    pub running: bool,
+    /// Current permission mode
+    pub mode: AppMode,
+    /// Result of last permission request
+    pub last_permission_result: Option<bool>,
+    /// Notify channel for permission responses
+    pub permission_notify: Arc<Notify>,
+    /// Legacy: pending actions (deprecated)
+    pub pending_actions: Vec<String>,
+    /// Current accumulated plan (for Plan mode)
+    pub accumulated_plan: Option<AccumulatedPlan>,
+    /// Pending plan approval from user
+    pub plan_approval: Option<PlanApproval>,
+    /// Notify channel for plan approval responses
+    pub plan_notify: Arc<Notify>,
+}
+
+impl Default for AppState {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl AppState {
+    pub fn new() -> Self {
+        Self {
+            messages: Vec::new(),
+            running: true,
+            mode: AppMode::Normal,
+            last_permission_result: None,
+            permission_notify: Arc::new(Notify::new()),
+            pending_actions: Vec::new(),
+            accumulated_plan: None,
+            plan_approval: None,
+            plan_notify: Arc::new(Notify::new()),
+        }
+    }
+
+    pub fn add_message(&mut self, message: ChatMessage) {
+        self.messages.push(message);
+    }
+
+    pub fn set_permission_result(&mut self, result: bool) {
+        self.last_permission_result = Some(result);
+        self.permission_notify.notify_one();
+    }
+
+    /// Start a new accumulated plan
+    pub fn start_plan(&mut self) {
+        self.accumulated_plan = Some(AccumulatedPlan::new());
+    }
+
+    /// Start a new accumulated plan with a name
+    pub fn start_plan_with_name(&mut self, name: String) {
+        self.accumulated_plan = Some(AccumulatedPlan::with_name(name));
+    }
+
+    /// Get the current plan (if any)
+    pub fn current_plan(&self) -> Option<&AccumulatedPlan> {
+        self.accumulated_plan.as_ref()
+    }
+
+    /// Get the current plan mutably (if any)
+    pub fn current_plan_mut(&mut self) -> Option<&mut AccumulatedPlan> {
+        self.accumulated_plan.as_mut()
+    }
+
+    /// Clear the current plan
+    pub fn clear_plan(&mut self) {
+        self.accumulated_plan = None;
+        self.plan_approval = None;
+    }
+
+    /// Set plan approval and notify waiting tasks
+    pub fn set_plan_approval(&mut self, approval: PlanApproval) {
+        self.plan_approval = Some(approval);
+        self.plan_notify.notify_one();
+    }
+
+    /// Take the plan approval (consuming it)
+    pub fn take_plan_approval(&mut self) -> Option<PlanApproval> {
+        self.plan_approval.take()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn test_app_state_sharing() {
+        let state = Arc::new(Mutex::new(AppState::new()));
+        
+        let state_clone = state.clone();
+        tokio::spawn(async move {
+            let mut guard = state_clone.lock().await;
+            guard.add_message(ChatMessage::user("Test"));
+        }).await.unwrap();
+
+        let guard = state.lock().await;
+        assert_eq!(guard.messages.len(), 1);
+    }
+}

crates/core/agent/src/system_prompt.rs

@@ -0,0 +1,273 @@
+//! System Prompt Management.
+//!
+//! This module is responsible for composing the complex system prompts sent to the LLM.
+//! It merges base instructions, tool definitions, project-specific context, and
+//! dynamically injected content from skills and hooks.
+
+use std::path::Path;
+
+/// Builder for incrementally composing a system prompt from various sources.
+#[derive(Debug, Clone, Default)]
+pub struct SystemPromptBuilder {
+    sections: Vec<PromptSection>,
+}
+
+#[derive(Debug, Clone)]
+struct PromptSection {
+    #[allow(dead_code)] // Used for debugging/display purposes
+    name: String,
+    content: String,
+    priority: i32,  // Lower = earlier in prompt
+}
+
+impl SystemPromptBuilder {
+    /// Creates a new, empty `SystemPromptBuilder`.
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Adds the base agent identity and instructions section.
+    pub fn with_base_prompt(mut self, content: impl Into<String>) -> Self {
+        self.sections.push(PromptSection {
+            name: "base".to_string(),
+            content: content.into(),
+            priority: 0,
+        });
+        self
+    }
+
+    /// Adds tool usage instructions.
+    pub fn with_tool_instructions(mut self, content: impl Into<String>) -> Self {
+        self.sections.push(PromptSection {
+            name: "tools".to_string(),
+            content: content.into(),
+            priority: 10,
+        });
+        self
+    }
+
+    /// Attempts to load project-specific instructions from `CLAUDE.md` or `.owlen.md`
+    /// located in the provided project root.
+    pub fn with_project_instructions(mut self, project_root: &Path) -> Self {
+        // Try CLAUDE.md first (Claude Code compatibility)
+        let claude_md = project_root.join("CLAUDE.md");
+        if claude_md.exists()
+            && let Ok(content) = std::fs::read_to_string(&claude_md)
+        {
+            self.sections.push(PromptSection {
+                name: "project".to_string(),
+                content: format!("# Project Instructions\n\n{}", content),
+                priority: 20,
+            });
+            return self;
+        }
+
+        // Fallback to .owlen.md
+        let owlen_md = project_root.join(".owlen.md");
+        if owlen_md.exists()
+            && let Ok(content) = std::fs::read_to_string(&owlen_md)
+        {
+            self.sections.push(PromptSection {
+                name: "project".to_string(),
+                content: format!("# Project Instructions\n\n{}", content),
+                priority: 20,
+            });
+        }
+
+        self
+    }
+
+    /// Adds domain-specific knowledge or instructions as a "skill".
+    pub fn with_skill(mut self, skill_name: &str, content: impl Into<String>) -> Self {
+        self.sections.push(PromptSection {
+            name: format!("skill:{}", skill_name),
+            content: content.into(),
+            priority: 30,
+        });
+        self
+    }
+
+    /// Injects context dynamically from hooks (e.g., during session initialization).
+    pub fn with_hook_injection(mut self, content: impl Into<String>) -> Self {
+        self.sections.push(PromptSection {
+            name: "hook".to_string(),
+            content: content.into(),
+            priority: 40,
+        });
+        self
+    }
+
+    /// Adds a generic custom section with a specific name and priority.
+    pub fn with_section(mut self, name: impl Into<String>, content: impl Into<String>, priority: i32) -> Self {
+        self.sections.push(PromptSection {
+            name: name.into(),
+            content: content.into(),
+            priority,
+        });
+        self
+    }
+
+    /// Finalizes the build process and returns the combined system prompt string.
+    ///
+    /// Sections are sorted by priority and separated by a horizontal rule (`---`).
+    pub fn build(mut self) -> String {
+        // Sort by priority
+        self.sections.sort_by_key(|s| s.priority);
+
+        // Join sections with separators
+        self.sections
+            .iter()
+            .map(|s| s.content.as_str())
+            .collect::<Vec<_>>()
+            .join("\n\n---\n\n")
+    }
+
+    /// Returns `true` if no prompt sections have been added yet.
+    pub fn is_empty(&self) -> bool {
+        self.sections.is_empty()
+    }
+}
+
+/// Returns the standard default identity and guideline prompt for the Owlen agent.
+pub fn default_base_prompt() -> &'static str {
+    r#"You are Owlen, an AI assistant that helps with software engineering tasks.
+
+You have access to tools for reading files, writing code, running commands, and searching the web.
+
+## Guidelines
+
+1. Be direct and concise in your responses
+2. Use tools to gather information before making changes
+3. Explain your reasoning when making decisions
+4. Ask for clarification when requirements are unclear
+5. Prefer editing existing files over creating new ones
+
+## Tool Usage
+
+- Use `read` to examine file contents before editing
+- Use `glob` and `grep` to find relevant files
+- Use `edit` for precise changes, `write` for new files
+- Use `bash` for running tests and commands
+- Use `web_search` for current information"#
+}
+
+/// Dynamically generates a summary of available tools to be included in the system prompt.
+pub fn generate_tool_instructions(tool_names: &[&str]) -> String {
+    let mut instructions = String::from("## Available Tools\n\n");
+
+    for name in tool_names {
+        let desc = match *name {
+            "read" => "Read file contents",
+            "write" => "Create or overwrite a file",
+            "edit" => "Edit a file by replacing text",
+            "multi_edit" => "Apply multiple edits atomically",
+            "glob" => "Find files by pattern",
+            "grep" => "Search file contents",
+            "ls" => "List directory contents",
+            "bash" => "Execute shell commands",
+            "web_search" => "Search the web",
+            "web_fetch" => "Fetch a URL",
+            "todo_write" => "Update task list",
+            "ask_user" => "Ask user a question",
+            _ => continue,
+        };
+        instructions.push_str(&format!("- `{}`: {}\n", name, desc));
+    }
+
+    instructions
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_builder() {
+        let prompt = SystemPromptBuilder::new()
+            .with_base_prompt("You are helpful")
+            .with_tool_instructions("Use tools wisely")
+            .build();
+
+        assert!(prompt.contains("You are helpful"));
+        assert!(prompt.contains("Use tools wisely"));
+    }
+
+    #[test]
+    fn test_priority_ordering() {
+        let prompt = SystemPromptBuilder::new()
+            .with_section("last", "Third", 100)
+            .with_section("first", "First", 0)
+            .with_section("middle", "Second", 50)
+            .build();
+
+        let first_pos = prompt.find("First").unwrap();
+        let second_pos = prompt.find("Second").unwrap();
+        let third_pos = prompt.find("Third").unwrap();
+
+        assert!(first_pos < second_pos);
+        assert!(second_pos < third_pos);
+    }
+
+    #[test]
+    fn test_default_base_prompt() {
+        let prompt = default_base_prompt();
+        assert!(prompt.contains("Owlen"));
+        assert!(prompt.contains("Guidelines"));
+        assert!(prompt.contains("Tool Usage"));
+    }
+
+    #[test]
+    fn test_generate_tool_instructions() {
+        let tools = vec!["read", "write", "edit", "bash"];
+        let instructions = generate_tool_instructions(&tools);
+
+        assert!(instructions.contains("Available Tools"));
+        assert!(instructions.contains("read"));
+        assert!(instructions.contains("write"));
+        assert!(instructions.contains("edit"));
+        assert!(instructions.contains("bash"));
+    }
+
+    #[test]
+    fn test_builder_empty() {
+        let builder = SystemPromptBuilder::new();
+        assert!(builder.is_empty());
+
+        let builder = builder.with_base_prompt("test");
+        assert!(!builder.is_empty());
+    }
+
+    #[test]
+    fn test_skill_section() {
+        let prompt = SystemPromptBuilder::new()
+            .with_base_prompt("Base")
+            .with_skill("rust", "Rust expertise")
+            .build();
+
+        assert!(prompt.contains("Base"));
+        assert!(prompt.contains("Rust expertise"));
+    }
+
+    #[test]
+    fn test_hook_injection() {
+        let prompt = SystemPromptBuilder::new()
+            .with_base_prompt("Base")
+            .with_hook_injection("Additional context from hook")
+            .build();
+
+        assert!(prompt.contains("Base"));
+        assert!(prompt.contains("Additional context from hook"));
+    }
+
+    #[test]
+    fn test_separator_between_sections() {
+        let prompt = SystemPromptBuilder::new()
+            .with_section("first", "First section", 0)
+            .with_section("second", "Second section", 10)
+            .build();
+
+        assert!(prompt.contains("---"));
+        assert!(prompt.contains("First section"));
+        assert!(prompt.contains("Second section"));
+    }
+}

crates/core/agent/tests/checkpoint.rs

@@ -0,0 +1,210 @@
+use agent_core::{Checkpoint, CheckpointManager, FileDiff, SessionHistory, SessionStats};
+use std::fs;
+use std::path::PathBuf;
+use tempfile::TempDir;
+
+#[test]
+fn test_checkpoint_save_and_load() {
+    let temp_dir = TempDir::new().unwrap();
+    let checkpoint_dir = temp_dir.path().to_path_buf();
+
+    let stats = SessionStats::new();
+    let mut history = SessionHistory::new();
+    history.add_user_message("Hello".to_string());
+    history.add_assistant_message("Hi there!".to_string());
+
+    let file_diffs = vec![FileDiff::new(
+        PathBuf::from("test.txt"),
+        "before".to_string(),
+        "after".to_string(),
+    )];
+
+    let checkpoint = Checkpoint::new(
+        "test-checkpoint".to_string(),
+        stats.clone(),
+        &history,
+        file_diffs,
+    );
+
+    // Save checkpoint
+    checkpoint.save(&checkpoint_dir).unwrap();
+
+    // Load checkpoint
+    let loaded = Checkpoint::load(&checkpoint_dir, "test-checkpoint").unwrap();
+
+    assert_eq!(loaded.id, "test-checkpoint");
+    assert_eq!(loaded.user_prompts, vec!["Hello"]);
+    assert_eq!(loaded.assistant_responses, vec!["Hi there!"]);
+    assert_eq!(loaded.file_diffs.len(), 1);
+    assert_eq!(loaded.file_diffs[0].path, PathBuf::from("test.txt"));
+    assert_eq!(loaded.file_diffs[0].before, "before");
+    assert_eq!(loaded.file_diffs[0].after, "after");
+}
+
+#[test]
+fn test_checkpoint_list() {
+    let temp_dir = TempDir::new().unwrap();
+    let checkpoint_dir = temp_dir.path().to_path_buf();
+
+    // Create a few checkpoints
+    for i in 1..=3 {
+        let checkpoint = Checkpoint::new(
+            format!("checkpoint-{}", i),
+            SessionStats::new(),
+            &SessionHistory::new(),
+            vec![],
+        );
+        checkpoint.save(&checkpoint_dir).unwrap();
+    }
+
+    let checkpoints = Checkpoint::list(&checkpoint_dir).unwrap();
+    assert_eq!(checkpoints.len(), 3);
+    assert!(checkpoints.contains(&"checkpoint-1".to_string()));
+    assert!(checkpoints.contains(&"checkpoint-2".to_string()));
+    assert!(checkpoints.contains(&"checkpoint-3".to_string()));
+}
+
+#[test]
+fn test_checkpoint_manager_snapshot_and_diff() {
+    let temp_dir = TempDir::new().unwrap();
+    let checkpoint_dir = temp_dir.path().join("checkpoints");
+    let test_file = temp_dir.path().join("test.txt");
+
+    // Create initial file content
+    fs::write(&test_file, "initial content").unwrap();
+
+    let mut manager = CheckpointManager::new(checkpoint_dir.clone());
+
+    // Snapshot the file
+    manager.snapshot_file(&test_file).unwrap();
+
+    // Modify the file
+    fs::write(&test_file, "modified content").unwrap();
+
+    // Create a diff
+    let diff = manager.create_diff(&test_file).unwrap();
+    assert!(diff.is_some());
+
+    let diff = diff.unwrap();
+    assert_eq!(diff.path, test_file);
+    assert_eq!(diff.before, "initial content");
+    assert_eq!(diff.after, "modified content");
+}
+
+#[test]
+fn test_checkpoint_manager_save_and_restore() {
+    let temp_dir = TempDir::new().unwrap();
+    let checkpoint_dir = temp_dir.path().join("checkpoints");
+    let test_file = temp_dir.path().join("test.txt");
+
+    // Create initial file content
+    fs::write(&test_file, "initial content").unwrap();
+
+    let mut manager = CheckpointManager::new(checkpoint_dir.clone());
+
+    // Snapshot the file
+    manager.snapshot_file(&test_file).unwrap();
+
+    // Modify the file
+    fs::write(&test_file, "modified content").unwrap();
+
+    // Save checkpoint
+    let mut history = SessionHistory::new();
+    history.add_user_message("test".to_string());
+    let checkpoint = manager
+        .save_checkpoint("test-checkpoint".to_string(), SessionStats::new(), &history)
+        .unwrap();
+
+    assert_eq!(checkpoint.file_diffs.len(), 1);
+    assert_eq!(checkpoint.file_diffs[0].before, "initial content");
+    assert_eq!(checkpoint.file_diffs[0].after, "modified content");
+
+    // Modify file again
+    fs::write(&test_file, "final content").unwrap();
+    assert_eq!(fs::read_to_string(&test_file).unwrap(), "final content");
+
+    // Rewind to checkpoint
+    let restored_files = manager.rewind_to("test-checkpoint").unwrap();
+    assert_eq!(restored_files.len(), 1);
+    assert_eq!(restored_files[0], test_file);
+
+    // File should be reverted to initial content (before the checkpoint)
+    assert_eq!(fs::read_to_string(&test_file).unwrap(), "initial content");
+}
+
+#[test]
+fn test_checkpoint_manager_multiple_files() {
+    let temp_dir = TempDir::new().unwrap();
+    let checkpoint_dir = temp_dir.path().join("checkpoints");
+    let test_file1 = temp_dir.path().join("file1.txt");
+    let test_file2 = temp_dir.path().join("file2.txt");
+
+    // Create initial files
+    fs::write(&test_file1, "file1 initial").unwrap();
+    fs::write(&test_file2, "file2 initial").unwrap();
+
+    let mut manager = CheckpointManager::new(checkpoint_dir.clone());
+
+    // Snapshot both files
+    manager.snapshot_file(&test_file1).unwrap();
+    manager.snapshot_file(&test_file2).unwrap();
+
+    // Modify both files
+    fs::write(&test_file1, "file1 modified").unwrap();
+    fs::write(&test_file2, "file2 modified").unwrap();
+
+    // Save checkpoint
+    let checkpoint = manager
+        .save_checkpoint(
+            "multi-file-checkpoint".to_string(),
+            SessionStats::new(),
+            &SessionHistory::new(),
+        )
+        .unwrap();
+
+    assert_eq!(checkpoint.file_diffs.len(), 2);
+
+    // Modify files again
+    fs::write(&test_file1, "file1 final").unwrap();
+    fs::write(&test_file2, "file2 final").unwrap();
+
+    // Rewind
+    let restored_files = manager.rewind_to("multi-file-checkpoint").unwrap();
+    assert_eq!(restored_files.len(), 2);
+
+    // Both files should be reverted
+    assert_eq!(fs::read_to_string(&test_file1).unwrap(), "file1 initial");
+    assert_eq!(fs::read_to_string(&test_file2).unwrap(), "file2 initial");
+}
+
+#[test]
+fn test_checkpoint_no_changes() {
+    let temp_dir = TempDir::new().unwrap();
+    let checkpoint_dir = temp_dir.path().join("checkpoints");
+    let test_file = temp_dir.path().join("test.txt");
+
+    // Create file
+    fs::write(&test_file, "content").unwrap();
+
+    let mut manager = CheckpointManager::new(checkpoint_dir.clone());
+
+    // Snapshot the file
+    manager.snapshot_file(&test_file).unwrap();
+
+    // Don't modify the file
+
+    // Create diff - should be None because nothing changed
+    let diff = manager.create_diff(&test_file).unwrap();
+    assert!(diff.is_none());
+
+    // Save checkpoint - should have no diffs
+    let checkpoint = manager
+        .save_checkpoint(
+            "no-change-checkpoint".to_string(),
+            SessionStats::new(),
+            &SessionHistory::new(),
+        )
+        .unwrap();
+
+    assert_eq!(checkpoint.file_diffs.len(), 0);
+}

crates/core/agent/tests/core_logic.rs

@@ -0,0 +1,75 @@
+use agent_core::{get_tool_definitions, ToolContext, execute_tool, AgentMode};
+use permissions::{Mode, PermissionManager};
+use serde_json::json;
+
+#[test]
+fn test_get_tool_definitions() {
+    let tools = get_tool_definitions();
+    assert!(!tools.is_empty());
+    
+    // Check for some specific tools
+    let has_read = tools.iter().any(|t| t.function.name == "read");
+    let has_write = tools.iter().any(|t| t.function.name == "write");
+    let has_bash = tools.iter().any(|t| t.function.name == "bash");
+    
+    assert!(has_read);
+    assert!(has_write);
+    assert!(has_bash);
+}
+
+#[tokio::test]
+async fn test_execute_tool_permission_ask() {
+    let ctx = ToolContext::new();
+    let perms = PermissionManager::new(Mode::Plan); // Plan mode asks for write
+    
+    let arguments = json!({
+        "path": "test.txt",
+        "content": "hello"
+    });
+    
+    let result = execute_tool("write", &arguments, &perms, &ctx).await;
+    assert!(result.is_err());
+    assert!(result.unwrap_err().to_string().contains("Permission required"));
+}
+
+#[tokio::test]
+async fn test_unknown_tool() {
+    let ctx = ToolContext::new();
+    let perms = PermissionManager::new(Mode::Code);
+    let arguments = json!({});
+    
+    let result = execute_tool("non_existent_tool", &arguments, &perms, &ctx).await;
+    assert!(result.is_err());
+    assert!(result.unwrap_err().to_string().contains("Unknown tool"));
+}
+
+#[tokio::test]
+async fn test_tool_context_mode_management() {
+    let ctx = ToolContext::new();
+    assert_eq!(ctx.get_mode().await, AgentMode::Normal);
+    assert!(!ctx.is_planning().await);
+    
+    ctx.set_mode(AgentMode::Planning { 
+        plan_file: "test_plan.md".into(), 
+        started_at: chrono::Utc::now() 
+    }).await;
+    
+    match ctx.get_mode().await {
+        AgentMode::Planning { plan_file, .. } => assert_eq!(plan_file.to_str().unwrap(), "test_plan.md"),
+        _ => panic!("Expected Planning mode"),
+    }
+    assert!(ctx.is_planning().await);
+}
+
+#[tokio::test]
+async fn test_agent_event_channel() {
+    let (tx, mut rx) = agent_core::create_event_channel();
+    
+    tx.send(agent_core::AgentEvent::TextDelta("hello".into())).await.unwrap();
+    
+    if let Some(agent_core::AgentEvent::TextDelta(text)) = rx.recv().await {
+        assert_eq!(text, "hello");
+    } else {
+        panic!("Expected TextDelta event");
+    }
+}

crates/core/agent/tests/plan_mode.rs

@@ -0,0 +1,200 @@
+//! Integration tests for Plan Mode multi-turn accumulation
+
+use agent_core::{
+    AccumulatedPlan, AccumulatedPlanStatus, PlanApproval, PlanStep,
+};
+use serde_json::json;
+
+/// Test that PlanStep can be created and has correct initial state
+#[test]
+fn test_plan_step_creation() {
+    let step = PlanStep::new(
+        "call_123".to_string(),
+        1,
+        "read".to_string(),
+        json!({"path": "/src/main.rs"}),
+    );
+
+    assert_eq!(step.id, "call_123");
+    assert_eq!(step.turn, 1);
+    assert_eq!(step.tool, "read");
+    assert!(step.is_pending());
+    assert!(!step.is_approved());
+    assert!(!step.is_rejected());
+}
+
+/// Test multi-turn accumulation of steps
+#[test]
+fn test_multi_turn_accumulation() {
+    let mut plan = AccumulatedPlan::new();
+    assert_eq!(plan.status, AccumulatedPlanStatus::Accumulating);
+    assert_eq!(plan.current_turn, 0);
+
+    // Turn 1: Agent proposes reading a file
+    plan.next_turn();
+    plan.add_step_with_rationale(
+        "call_1".to_string(),
+        "read".to_string(),
+        json!({"path": "Cargo.toml"}),
+        "I need to read the project configuration".to_string(),
+    );
+
+    assert_eq!(plan.steps.len(), 1);
+    assert_eq!(plan.current_turn, 1);
+
+    // Turn 2: Agent proposes editing the file
+    plan.next_turn();
+    plan.add_step_with_rationale(
+        "call_2".to_string(),
+        "edit".to_string(),
+        json!({"path": "Cargo.toml", "old": "version = \"0.1.0\"", "new": "version = \"0.2.0\""}),
+        "Bump the version".to_string(),
+    );
+
+    // Turn 2: Agent also proposes running tests
+    plan.add_step_with_rationale(
+        "call_3".to_string(),
+        "bash".to_string(),
+        json!({"command": "cargo test"}),
+        "Verify the change doesn't break anything".to_string(),
+    );
+
+    assert_eq!(plan.steps.len(), 3);
+    assert_eq!(plan.current_turn, 2);
+
+    // All steps should be pending
+    let (pending, approved, rejected) = plan.counts();
+    assert_eq!((pending, approved, rejected), (3, 0, 0));
+}
+
+/// Test plan finalization and status transition
+#[test]
+fn test_plan_finalization() {
+    let mut plan = AccumulatedPlan::new();
+    plan.next_turn();
+    plan.add_step_for_current_turn("call_1".to_string(), "read".to_string(), json!({}));
+
+    assert_eq!(plan.status, AccumulatedPlanStatus::Accumulating);
+
+    plan.finalize();
+    assert_eq!(plan.status, AccumulatedPlanStatus::Reviewing);
+}
+
+/// Test selective approval workflow
+#[test]
+fn test_selective_approval() {
+    let mut plan = AccumulatedPlan::new();
+
+    // Add three steps
+    plan.add_step_for_current_turn("step_read".to_string(), "read".to_string(), json!({}));
+    plan.add_step_for_current_turn("step_write".to_string(), "write".to_string(), json!({}));
+    plan.add_step_for_current_turn("step_bash".to_string(), "bash".to_string(), json!({}));
+
+    plan.finalize();
+
+    // User approves read and write, rejects bash
+    let approval = PlanApproval {
+        approved_ids: vec!["step_read".to_string(), "step_write".to_string()],
+        rejected_ids: vec!["step_bash".to_string()],
+    };
+
+    approval.apply_to(&mut plan);
+
+    // Verify approval state
+    assert!(plan.steps[0].is_approved());
+    assert!(plan.steps[1].is_approved());
+    assert!(plan.steps[2].is_rejected());
+
+    assert_eq!(plan.approved_steps().len(), 2);
+    assert_eq!(plan.rejected_steps().len(), 1);
+    assert!(plan.all_decided());
+}
+
+/// Test execution workflow
+#[test]
+fn test_execution_workflow() {
+    let mut plan = AccumulatedPlan::new();
+    plan.add_step_for_current_turn("s1".to_string(), "read".to_string(), json!({}));
+    plan.add_step_for_current_turn("s2".to_string(), "write".to_string(), json!({}));
+
+    // Finalize
+    plan.finalize();
+    assert_eq!(plan.status, AccumulatedPlanStatus::Reviewing);
+
+    // Approve all
+    plan.approve_all();
+
+    // Start execution
+    plan.start_execution();
+    assert_eq!(plan.status, AccumulatedPlanStatus::Executing);
+
+    // Complete execution
+    plan.complete();
+    assert_eq!(plan.status, AccumulatedPlanStatus::Completed);
+}
+
+/// Test plan cancellation
+#[test]
+fn test_plan_cancellation() {
+    let mut plan = AccumulatedPlan::new();
+    plan.add_step_for_current_turn("s1".to_string(), "read".to_string(), json!({}));
+    plan.finalize();
+
+    plan.cancel();
+    assert_eq!(plan.status, AccumulatedPlanStatus::Cancelled);
+}
+
+/// Test approve_all only affects pending steps
+#[test]
+fn test_approve_all_respects_existing_decisions() {
+    let mut plan = AccumulatedPlan::new();
+    plan.add_step_for_current_turn("s1".to_string(), "read".to_string(), json!({}));
+    plan.add_step_for_current_turn("s2".to_string(), "write".to_string(), json!({}));
+    plan.add_step_for_current_turn("s3".to_string(), "bash".to_string(), json!({}));
+
+    // Reject s3 before approve_all
+    plan.reject_step("s3");
+
+    // Approve all (should only affect pending)
+    plan.approve_all();
+
+    assert!(plan.steps[0].is_approved()); // was pending, now approved
+    assert!(plan.steps[1].is_approved()); // was pending, now approved
+    assert!(plan.steps[2].is_rejected()); // was rejected, stays rejected
+}
+
+/// Test plan with name
+#[test]
+fn test_named_plan() {
+    let plan = AccumulatedPlan::with_name("Fix bug #123".to_string());
+    assert_eq!(plan.name, Some("Fix bug #123".to_string()));
+}
+
+/// Test step rationale tracking
+#[test]
+fn test_step_rationale() {
+    let step = PlanStep::new("id".to_string(), 1, "read".to_string(), json!({}))
+        .with_rationale("I need to understand the code structure".to_string());
+
+    assert_eq!(
+        step.rationale,
+        Some("I need to understand the code structure".to_string())
+    );
+}
+
+/// Test filtering steps by approval status
+#[test]
+fn test_step_filtering() {
+    let mut plan = AccumulatedPlan::new();
+    plan.add_step_for_current_turn("a".to_string(), "read".to_string(), json!({}));
+    plan.add_step_for_current_turn("b".to_string(), "write".to_string(), json!({}));
+    plan.add_step_for_current_turn("c".to_string(), "bash".to_string(), json!({}));
+
+    plan.approve_step("a");
+    plan.reject_step("b");
+    // c remains pending
+
+    assert_eq!(plan.approved_steps().len(), 1);
+    assert_eq!(plan.rejected_steps().len(), 1);
+    assert_eq!(plan.pending_steps().len(), 1);
+}

crates/core/agent/tests/streaming.rs

@@ -0,0 +1,276 @@
+use agent_core::{create_event_channel, run_agent_loop_streaming, AgentEvent, ToolContext};
+use async_trait::async_trait;
+use futures_util::stream;
+use llm_core::{
+    ChatMessage, ChatOptions, LlmError, StreamChunk, LlmProvider, Tool, ToolCallDelta,
+};
+use permissions::{Mode, PermissionManager};
+use std::pin::Pin;
+
+/// Mock LLM provider for testing streaming
+struct MockStreamingProvider {
+    responses: Vec<MockResponse>,
+}
+
+enum MockResponse {
+    /// Text-only response (no tool calls)
+    Text(Vec<String>), // Chunks of text
+    /// Tool call response
+    ToolCall {
+        text_chunks: Vec<String>,
+        tool_id: String,
+        tool_name: String,
+        tool_args: String,
+    },
+}
+
+#[async_trait]
+impl LlmProvider for MockStreamingProvider {
+    fn name(&self) -> &str {
+        "mock"
+    }
+
+    fn model(&self) -> &str {
+        "mock-model"
+    }
+
+    async fn chat_stream(
+        &self,
+        messages: &[ChatMessage],
+        _options: &ChatOptions,
+        _tools: Option<&[Tool]>,
+    ) -> Result<Pin<Box<dyn futures_util::Stream<Item = Result<StreamChunk, LlmError>> + Send>>, LlmError> {
+        // Determine which response to use based on message count
+        let response_idx = (messages.len() / 2).min(self.responses.len() - 1);
+        let response = &self.responses[response_idx];
+
+        let chunks: Vec<Result<StreamChunk, LlmError>> = match response {
+            MockResponse::Text(text_chunks) => text_chunks
+                .iter()
+                .map(|text| {
+                    Ok(StreamChunk {
+                        content: Some(text.clone()),
+                        tool_calls: None,
+                        done: false,
+                        usage: None,
+                    })
+                })
+                .collect(),
+            MockResponse::ToolCall {
+                text_chunks,
+                tool_id,
+                tool_name,
+                tool_args,
+            } => {
+                let mut result = vec![];
+
+                // First emit text chunks
+                for text in text_chunks {
+                    result.push(Ok(StreamChunk {
+                        content: Some(text.clone()),
+                        tool_calls: None,
+                        done: false,
+                        usage: None,
+                    }));
+                }
+
+                // Then emit tool call in chunks
+                result.push(Ok(StreamChunk {
+                    content: None,
+                    tool_calls: Some(vec![ToolCallDelta {
+                        index: 0,
+                        id: Some(tool_id.clone()),
+                        function_name: Some(tool_name.clone()),
+                        arguments_delta: None,
+                    }]),
+                    done: false,
+                    usage: None,
+                }));
+
+                // Emit args in chunks
+                for chunk in tool_args.chars().collect::<Vec<_>>().chunks(5) {
+                    result.push(Ok(StreamChunk {
+                        content: None,
+                        tool_calls: Some(vec![ToolCallDelta {
+                            index: 0,
+                            id: None,
+                            function_name: None,
+                            arguments_delta: Some(chunk.iter().collect()),
+                        }]),
+                        done: false,
+                        usage: None,
+                    }));
+                }
+
+                result
+            }
+        };
+
+        Ok(Box::pin(stream::iter(chunks)))
+    }
+}
+
+#[tokio::test]
+async fn test_streaming_text_only() {
+    let provider = MockStreamingProvider {
+        responses: vec![MockResponse::Text(vec![
+            "Hello".to_string(),
+            " ".to_string(),
+            "world".to_string(),
+            "!".to_string(),
+        ])],
+    };
+
+    let perms = PermissionManager::new(Mode::Plan);
+    let ctx = ToolContext::default();
+    let (tx, mut rx) = create_event_channel();
+
+    // Spawn the agent loop
+    let handle = tokio::spawn(async move {
+        run_agent_loop_streaming(
+            &provider,
+            "Say hello",
+            &ChatOptions::default(),
+            &perms,
+            &ctx,
+            tx,
+        )
+        .await
+    });
+
+    // Collect events
+    let mut text_deltas = vec![];
+    let mut done_response = None;
+
+    while let Some(event) = rx.recv().await {
+        match event {
+            AgentEvent::TextDelta(text) => {
+                text_deltas.push(text);
+            }
+            AgentEvent::Done { final_response } => {
+                done_response = Some(final_response);
+                break;
+            }
+            AgentEvent::Error(e) => {
+                panic!("Unexpected error: {}", e);
+            }
+            _ => {}
+        }
+    }
+
+    // Wait for agent loop to complete
+    let result = handle.await.unwrap();
+    assert!(result.is_ok());
+
+    // Verify events
+    assert_eq!(text_deltas, vec!["Hello", " ", "world", "!"]);
+    assert_eq!(done_response, Some("Hello world!".to_string()));
+    assert_eq!(result.unwrap(), "Hello world!");
+}
+
+#[tokio::test]
+async fn test_streaming_with_tool_call() {
+    let provider = MockStreamingProvider {
+        responses: vec![
+            MockResponse::ToolCall {
+                text_chunks: vec!["Let me ".to_string(), "check...".to_string()],
+                tool_id: "call_123".to_string(),
+                tool_name: "glob".to_string(),
+                tool_args: r#"{"pattern":"*.rs"}"#.to_string(),
+            },
+            MockResponse::Text(vec!["Found ".to_string(), "the files!".to_string()]),
+        ],
+    };
+
+    let perms = PermissionManager::new(Mode::Plan);
+    let ctx = ToolContext::default();
+    let (tx, mut rx) = create_event_channel();
+
+    // Spawn the agent loop
+    let handle = tokio::spawn(async move {
+        run_agent_loop_streaming(
+            &provider,
+            "Find Rust files",
+            &ChatOptions::default(),
+            &perms,
+            &ctx,
+            tx,
+        )
+        .await
+    });
+
+    // Collect events
+    let mut text_deltas = vec![];
+    let mut tool_starts = vec![];
+    let mut tool_outputs = vec![];
+    let mut tool_ends = vec![];
+
+    while let Some(event) = rx.recv().await {
+        match event {
+            AgentEvent::TextDelta(text) => {
+                text_deltas.push(text);
+            }
+            AgentEvent::ToolStart {
+                tool_name,
+                tool_id,
+            } => {
+                tool_starts.push((tool_name, tool_id));
+            }
+            AgentEvent::ToolOutput {
+                tool_id,
+                content,
+                is_error,
+            } => {
+                tool_outputs.push((tool_id, content, is_error));
+            }
+            AgentEvent::ToolEnd { tool_id, success } => {
+                tool_ends.push((tool_id, success));
+            }
+            AgentEvent::Done { .. } => {
+                break;
+            }
+            AgentEvent::Error(e) => {
+                panic!("Unexpected error: {}", e);
+            }
+        }
+    }
+
+    // Wait for agent loop to complete
+    let result = handle.await.unwrap();
+    assert!(result.is_ok());
+
+    // Verify we got text deltas from both responses
+    assert!(text_deltas.contains(&"Let me ".to_string()));
+    assert!(text_deltas.contains(&"check...".to_string()));
+    assert!(text_deltas.contains(&"Found ".to_string()));
+    assert!(text_deltas.contains(&"the files!".to_string()));
+
+    // Verify tool events
+    assert_eq!(tool_starts.len(), 1);
+    assert_eq!(tool_starts[0].0, "glob");
+    assert_eq!(tool_starts[0].1, "call_123");
+
+    assert_eq!(tool_outputs.len(), 1);
+    assert_eq!(tool_outputs[0].0, "call_123");
+    assert!(!tool_outputs[0].2); // not an error
+
+    assert_eq!(tool_ends.len(), 1);
+    assert_eq!(tool_ends[0].0, "call_123");
+    assert!(tool_ends[0].1); // success
+}
+
+#[tokio::test]
+async fn test_channel_creation() {
+    let (tx, mut rx) = create_event_channel();
+
+    // Test that channel works
+    tx.send(AgentEvent::TextDelta("test".to_string()))
+        .await
+        .unwrap();
+
+    let event = rx.recv().await.unwrap();
+    match event {
+        AgentEvent::TextDelta(text) => assert_eq!(text, "test"),
+        _ => panic!("Wrong event type"),
+    }
+}

crates/core/agent/tests/tool_context.rs

@@ -0,0 +1,224 @@
+// Test that ToolContext properly wires up the placeholder tools
+use agent_core::{ToolContext, execute_tool, get_tool_definitions_with_external};
+use permissions::{Mode, PermissionManager};
+use plugins::{ExternalToolDefinition, ExternalToolTransport, ExternalToolSchema};
+use tools_todo::{TodoList, TodoStatus};
+use tools_bash::ShellManager;
+use serde_json::json;
+use std::collections::HashMap;
+use std::path::PathBuf;
+
+#[tokio::test]
+async fn test_todo_write_with_context() {
+    let todo_list = TodoList::new();
+    let ctx = ToolContext::new().with_todo_list(todo_list.clone());
+    let perms = PermissionManager::new(Mode::Code); // Allow all tools
+    
+    let arguments = json!({
+        "todos": [
+            {
+                "content": "First task",
+                "status": "pending",
+                "active_form": "Working on first task"
+            },
+            {
+                "content": "Second task",
+                "status": "in_progress",
+                "active_form": "Working on second task"
+            }
+        ]
+    });
+    
+    let result = execute_tool("todo_write", &arguments, &perms, &ctx).await;
+    assert!(result.is_ok(), "TodoWrite should succeed: {:?}", result);
+    
+    // Verify the todos were written
+    let todos = todo_list.read();
+    assert_eq!(todos.len(), 2);
+    assert_eq!(todos[0].content, "First task");
+    assert_eq!(todos[1].status, TodoStatus::InProgress);
+}
+
+#[tokio::test]
+async fn test_todo_write_without_context() {
+    let ctx = ToolContext::new(); // No todo_list
+    let perms = PermissionManager::new(Mode::Code);
+    
+    let arguments = json!({
+        "todos": []
+    });
+    
+    let result = execute_tool("todo_write", &arguments, &perms, &ctx).await;
+    assert!(result.is_err(), "TodoWrite should fail without TodoList");
+    assert!(result.unwrap_err().to_string().contains("not available"));
+}
+
+#[tokio::test]
+async fn test_bash_output_with_context() {
+    let manager = ShellManager::new();
+    let ctx = ToolContext::new().with_shell_manager(manager.clone());
+    let perms = PermissionManager::new(Mode::Code);
+    
+    // Start a shell and run a command
+    let shell_id = manager.start_shell().await.unwrap();
+    let _ = manager.execute(&shell_id, "echo test", None).await.unwrap();
+    
+    let arguments = json!({
+        "shell_id": shell_id
+    });
+    
+    let result = execute_tool("bash_output", &arguments, &perms, &ctx).await;
+    assert!(result.is_ok(), "BashOutput should succeed: {:?}", result);
+}
+
+#[tokio::test]
+async fn test_bash_output_without_context() {
+    let ctx = ToolContext::new(); // No shell_manager
+    let perms = PermissionManager::new(Mode::Code);
+    
+    let arguments = json!({
+        "shell_id": "fake-id"
+    });
+    
+    let result = execute_tool("bash_output", &arguments, &perms, &ctx).await;
+    assert!(result.is_err(), "BashOutput should fail without ShellManager");
+    assert!(result.unwrap_err().to_string().contains("not available"));
+}
+
+#[tokio::test]
+async fn test_kill_shell_with_context() {
+    let manager = ShellManager::new();
+    let ctx = ToolContext::new().with_shell_manager(manager.clone());
+    let perms = PermissionManager::new(Mode::Code);
+    
+    // Start a shell
+    let shell_id = manager.start_shell().await.unwrap();
+    
+    let arguments = json!({
+        "shell_id": shell_id
+    });
+    
+    let result = execute_tool("kill_shell", &arguments, &perms, &ctx).await;
+    assert!(result.is_ok(), "KillShell should succeed: {:?}", result);
+}
+
+#[tokio::test]
+async fn test_ask_user_without_context() {
+    let ctx = ToolContext::new(); // No ask_sender
+    let perms = PermissionManager::new(Mode::Code);
+    
+    let arguments = json!({
+        "questions": []
+    });
+    
+    let result = execute_tool("ask_user", &arguments, &perms, &ctx).await;
+    assert!(result.is_err(), "AskUser should fail without AskSender");
+    assert!(result.unwrap_err().to_string().contains("not available"));
+}
+
+// ============================================================================
+// External Tools Tests
+// ============================================================================
+
+fn create_test_external_tool(name: &str, description: &str) -> ExternalToolDefinition {
+    ExternalToolDefinition {
+        name: name.to_string(),
+        description: description.to_string(),
+        transport: ExternalToolTransport::Stdio,
+        command: Some("echo".to_string()),
+        args: vec![],
+        url: None,
+        timeout_ms: 5000,
+        input_schema: ExternalToolSchema {
+            schema_type: "object".to_string(),
+            properties: {
+                let mut props = HashMap::new();
+                props.insert(
+                    "input".to_string(),
+                    json!({"type": "string", "description": "Test input"}),
+                );
+                props
+            },
+            required: vec!["input".to_string()],
+        },
+        source_path: PathBuf::from("/test/plugin"),
+        plugin_name: "test-plugin".to_string(),
+    }
+}
+
+#[tokio::test]
+async fn test_with_external_tools() {
+    let mut ext_tools = HashMap::new();
+    ext_tools.insert(
+        "my_custom_tool".to_string(),
+        create_test_external_tool("my_custom_tool", "A custom tool for testing"),
+    );
+
+    let ctx = ToolContext::new().with_external_tools(ext_tools);
+
+    assert!(ctx.has_external_tool("my_custom_tool"));
+    assert!(!ctx.has_external_tool("nonexistent"));
+
+    let tool = ctx.get_external_tool("my_custom_tool").unwrap();
+    assert_eq!(tool.name, "my_custom_tool");
+    assert_eq!(tool.description, "A custom tool for testing");
+}
+
+#[tokio::test]
+async fn test_get_tool_definitions_with_external() {
+    let mut ext_tools = HashMap::new();
+    ext_tools.insert(
+        "external_analyzer".to_string(),
+        create_test_external_tool("external_analyzer", "Analyze stuff externally"),
+    );
+    ext_tools.insert(
+        "external_formatter".to_string(),
+        create_test_external_tool("external_formatter", "Format things externally"),
+    );
+
+    let ctx = ToolContext::new().with_external_tools(ext_tools);
+    let all_tools = get_tool_definitions_with_external(&ctx);
+
+    // Should have built-in tools plus our 2 external tools
+    let external_tool_names: Vec<_> = all_tools
+        .iter()
+        .filter(|t| t.function.name == "external_analyzer" || t.function.name == "external_formatter")
+        .collect();
+    assert_eq!(external_tool_names.len(), 2);
+
+    // Verify external tool schema is correct
+    let analyzer = all_tools.iter().find(|t| t.function.name == "external_analyzer").unwrap();
+    assert!(analyzer.function.description.contains("Analyze stuff"));
+}
+
+#[tokio::test]
+async fn test_unknown_tool_without_external() {
+    let ctx = ToolContext::new();
+    let perms = PermissionManager::new(Mode::Code);
+
+    let arguments = json!({"input": "test"});
+    let result = execute_tool("completely_unknown_tool", &arguments, &perms, &ctx).await;
+
+    assert!(result.is_err());
+    assert!(result.unwrap_err().to_string().contains("Unknown tool"));
+}
+
+#[tokio::test]
+async fn test_external_tool_permission_denied() {
+    let mut ext_tools = HashMap::new();
+    ext_tools.insert(
+        "dangerous_tool".to_string(),
+        create_test_external_tool("dangerous_tool", "A dangerous tool"),
+    );
+
+    let ctx = ToolContext::new().with_external_tools(ext_tools);
+    let perms = PermissionManager::new(Mode::Plan); // Plan mode denies bash-like tools
+
+    let arguments = json!({"input": "test"});
+    let result = execute_tool("dangerous_tool", &arguments, &perms, &ctx).await;
+
+    // External tools are treated like Bash, so should require permission in Plan mode
+    assert!(result.is_err());
+    let err = result.unwrap_err().to_string();
+    assert!(err.contains("Permission required") || err.contains("Permission denied"));
+}

crates/integration/jsonrpc/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "jsonrpc"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+description = "JSON-RPC 2.0 client for external tool communication"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tokio = { version = "1", features = ["process", "io-util", "time", "sync"] }
+color-eyre = "0.6"
+uuid = { version = "1.0", features = ["v4"] }
+
+[dev-dependencies]
+tokio = { version = "1", features = ["full", "test-util"] }

crates/integration/jsonrpc/src/lib.rs

@@ -0,0 +1,391 @@
+//! JSON-RPC 2.0 client for external tool communication
+//!
+//! This crate provides a JSON-RPC 2.0 client for invoking external tools
+//! via stdio (spawning a process) or HTTP endpoints.
+
+use color_eyre::eyre::{eyre, Result};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::process::Stdio;
+use std::time::Duration;
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+use tokio::process::{Child, Command};
+use tokio::time::timeout;
+use uuid::Uuid;
+
+// ============================================================================
+// JSON-RPC 2.0 Protocol Types
+// ============================================================================
+
+/// JSON-RPC 2.0 request
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcRequest {
+    /// JSON-RPC version (must be "2.0")
+    pub jsonrpc: String,
+    /// Request ID for matching responses
+    pub id: serde_json::Value,
+    /// Method name to invoke
+    pub method: String,
+    /// Method parameters
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub params: Option<serde_json::Value>,
+}
+
+impl JsonRpcRequest {
+    /// Create a new JSON-RPC request
+    pub fn new(method: impl Into<String>, params: Option<serde_json::Value>) -> Self {
+        Self {
+            jsonrpc: "2.0".to_string(),
+            id: serde_json::Value::String(Uuid::new_v4().to_string()),
+            method: method.into(),
+            params,
+        }
+    }
+
+    /// Create a request with a specific ID
+    pub fn with_id(id: impl Into<serde_json::Value>, method: impl Into<String>, params: Option<serde_json::Value>) -> Self {
+        Self {
+            jsonrpc: "2.0".to_string(),
+            id: id.into(),
+            method: method.into(),
+            params,
+        }
+    }
+
+    /// Serialize to JSON string with newline
+    pub fn to_json_line(&self) -> Result<String> {
+        let mut json = serde_json::to_string(self)?;
+        json.push('\n');
+        Ok(json)
+    }
+}
+
+/// JSON-RPC 2.0 response
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcResponse {
+    /// JSON-RPC version (must be "2.0")
+    pub jsonrpc: String,
+    /// Request ID this is responding to
+    pub id: serde_json::Value,
+    /// Result (on success)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub result: Option<serde_json::Value>,
+    /// Error (on failure)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error: Option<JsonRpcError>,
+}
+
+impl JsonRpcResponse {
+    /// Check if the response is an error
+    pub fn is_error(&self) -> bool {
+        self.error.is_some()
+    }
+
+    /// Get the result or error as a Result type
+    pub fn into_result(self) -> Result<serde_json::Value> {
+        if let Some(err) = self.error {
+            Err(eyre!("JSON-RPC error {}: {}", err.code, err.message))
+        } else {
+            self.result.ok_or_else(|| eyre!("No result in response"))
+        }
+    }
+}
+
+/// JSON-RPC 2.0 error
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcError {
+    /// Error code (standard or application-specific)
+    pub code: i64,
+    /// Short error message
+    pub message: String,
+    /// Additional error data
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub data: Option<serde_json::Value>,
+}
+
+/// Standard JSON-RPC 2.0 error codes
+pub mod error_codes {
+    /// Invalid JSON was received
+    pub const PARSE_ERROR: i64 = -32700;
+    /// The JSON sent is not a valid Request object
+    pub const INVALID_REQUEST: i64 = -32600;
+    /// The method does not exist or is not available
+    pub const METHOD_NOT_FOUND: i64 = -32601;
+    /// Invalid method parameter(s)
+    pub const INVALID_PARAMS: i64 = -32602;
+    /// Internal JSON-RPC error
+    pub const INTERNAL_ERROR: i64 = -32603;
+}
+
+// ============================================================================
+// Stdio Client
+// ============================================================================
+
+/// JSON-RPC client over stdio (spawned process)
+pub struct StdioClient {
+    /// Spawned child process
+    child: Child,
+    /// Request timeout
+    timeout: Duration,
+}
+
+impl StdioClient {
+    /// Spawn a new stdio client
+    pub async fn spawn(
+        command: impl AsRef<str>,
+        args: &[String],
+        env: &HashMap<String, String>,
+        timeout_ms: u64,
+    ) -> Result<Self> {
+        let mut cmd = Command::new(command.as_ref());
+        cmd.args(args)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::inherit());
+
+        // Add environment variables
+        for (key, value) in env {
+            cmd.env(key, value);
+        }
+
+        let child = cmd.spawn()?;
+
+        Ok(Self {
+            child,
+            timeout: Duration::from_millis(timeout_ms),
+        })
+    }
+
+    /// Spawn from a path (resolving relative paths)
+    pub async fn spawn_from_path(
+        command: &PathBuf,
+        args: &[String],
+        env: &HashMap<String, String>,
+        working_dir: Option<&PathBuf>,
+        timeout_ms: u64,
+    ) -> Result<Self> {
+        let mut cmd = Command::new(command);
+        cmd.args(args)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::inherit());
+
+        if let Some(dir) = working_dir {
+            cmd.current_dir(dir);
+        }
+
+        for (key, value) in env {
+            cmd.env(key, value);
+        }
+
+        let child = cmd.spawn()?;
+
+        Ok(Self {
+            child,
+            timeout: Duration::from_millis(timeout_ms),
+        })
+    }
+
+    /// Send a request and wait for response
+    pub async fn call(&mut self, method: &str, params: Option<serde_json::Value>) -> Result<serde_json::Value> {
+        let request = JsonRpcRequest::new(method, params);
+        let request_id = request.id.clone();
+
+        // Get handles to stdin/stdout
+        let stdin = self.child.stdin.as_mut()
+            .ok_or_else(|| eyre!("Failed to get stdin handle"))?;
+        let stdout = self.child.stdout.take()
+            .ok_or_else(|| eyre!("Failed to get stdout handle"))?;
+
+        // Write request
+        let request_json = request.to_json_line()?;
+        stdin.write_all(request_json.as_bytes()).await?;
+        stdin.flush().await?;
+
+        // Read response with timeout
+        let mut reader = BufReader::new(stdout);
+        let mut line = String::new();
+
+        let result = timeout(self.timeout, reader.read_line(&mut line)).await;
+
+        // Restore stdout for future calls
+        self.child.stdout = Some(reader.into_inner());
+
+        match result {
+            Ok(Ok(0)) => Err(eyre!("Process closed stdout")),
+            Ok(Ok(_)) => {
+                let response: JsonRpcResponse = serde_json::from_str(&line)?;
+
+                // Verify ID matches
+                if response.id != request_id {
+                    return Err(eyre!(
+                        "Response ID mismatch: expected {:?}, got {:?}",
+                        request_id,
+                        response.id
+                    ));
+                }
+
+                response.into_result()
+            }
+            Ok(Err(e)) => Err(e.into()),
+            Err(_) => Err(eyre!("Request timed out after {:?}", self.timeout)),
+        }
+    }
+
+    /// Check if the process is still running
+    pub fn is_alive(&mut self) -> bool {
+        matches!(self.child.try_wait(), Ok(None))
+    }
+
+    /// Kill the process
+    pub async fn kill(&mut self) -> Result<()> {
+        self.child.kill().await?;
+        Ok(())
+    }
+}
+
+impl Drop for StdioClient {
+    fn drop(&mut self) {
+        // Try to kill the process on drop
+        let _ = self.child.start_kill();
+    }
+}
+
+// ============================================================================
+// Tool Executor
+// ============================================================================
+
+/// Executor for external tools via JSON-RPC
+pub struct ToolExecutor {
+    /// Default timeout for tool calls
+    default_timeout: Duration,
+}
+
+impl Default for ToolExecutor {
+    fn default() -> Self {
+        Self {
+            default_timeout: Duration::from_secs(30),
+        }
+    }
+}
+
+impl ToolExecutor {
+    /// Create a new tool executor with custom timeout
+    pub fn with_timeout(timeout_ms: u64) -> Self {
+        Self {
+            default_timeout: Duration::from_millis(timeout_ms),
+        }
+    }
+
+    /// Execute a tool via stdio
+    pub async fn execute_stdio(
+        &self,
+        command: &str,
+        args: &[String],
+        env: &HashMap<String, String>,
+        tool_params: serde_json::Value,
+        timeout_ms: Option<u64>,
+    ) -> Result<serde_json::Value> {
+        let timeout = timeout_ms.unwrap_or(self.default_timeout.as_millis() as u64);
+
+        let mut client = StdioClient::spawn(command, args, env, timeout).await?;
+
+        // The standard method name for tool execution
+        let result = client.call("execute", Some(tool_params)).await?;
+
+        // Kill the process after we're done
+        let _ = client.kill().await;
+
+        Ok(result)
+    }
+
+    /// Execute a tool via HTTP (not implemented yet)
+    pub async fn execute_http(
+        &self,
+        _url: &str,
+        _tool_params: serde_json::Value,
+        _timeout_ms: Option<u64>,
+    ) -> Result<serde_json::Value> {
+        Err(eyre!("HTTP transport not yet implemented"))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_jsonrpc_request_serialization() {
+        let request = JsonRpcRequest::new("test_method", Some(serde_json::json!({"arg": "value"})));
+
+        assert_eq!(request.jsonrpc, "2.0");
+        assert_eq!(request.method, "test_method");
+        assert!(request.params.is_some());
+
+        let json = serde_json::to_string(&request).unwrap();
+        assert!(json.contains("\"jsonrpc\":\"2.0\""));
+        assert!(json.contains("\"method\":\"test_method\""));
+    }
+
+    #[test]
+    fn test_jsonrpc_response_success() {
+        let json = r#"{"jsonrpc":"2.0","id":"123","result":{"data":"hello"}}"#;
+        let response: JsonRpcResponse = serde_json::from_str(json).unwrap();
+
+        assert!(!response.is_error());
+        assert_eq!(response.id, serde_json::json!("123"));
+        assert_eq!(response.result.unwrap()["data"], "hello");
+    }
+
+    #[test]
+    fn test_jsonrpc_response_error() {
+        let json = r#"{"jsonrpc":"2.0","id":"123","error":{"code":-32600,"message":"Invalid Request"}}"#;
+        let response: JsonRpcResponse = serde_json::from_str(json).unwrap();
+
+        assert!(response.is_error());
+        let err = response.error.unwrap();
+        assert_eq!(err.code, error_codes::INVALID_REQUEST);
+        assert_eq!(err.message, "Invalid Request");
+    }
+
+    #[test]
+    fn test_jsonrpc_request_line_format() {
+        let request = JsonRpcRequest::with_id("test-id", "method", None);
+        let line = request.to_json_line().unwrap();
+
+        assert!(line.ends_with('\n'));
+        assert!(!line.ends_with("\n\n"));
+    }
+
+    #[test]
+    fn test_response_into_result_success() {
+        let response = JsonRpcResponse {
+            jsonrpc: "2.0".to_string(),
+            id: serde_json::json!("1"),
+            result: Some(serde_json::json!({"success": true})),
+            error: None,
+        };
+
+        let result = response.into_result().unwrap();
+        assert_eq!(result["success"], true);
+    }
+
+    #[test]
+    fn test_response_into_result_error() {
+        let response = JsonRpcResponse {
+            jsonrpc: "2.0".to_string(),
+            id: serde_json::json!("1"),
+            result: None,
+            error: Some(JsonRpcError {
+                code: -32600,
+                message: "Invalid".to_string(),
+                data: None,
+            }),
+        };
+
+        let result = response.into_result();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().to_string().contains("-32600"));
+    }
+}

crates/integration/mcp-client/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "mcp-client"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1.39", features = ["process", "io-util", "sync", "time"] }
+color-eyre = "0.6"
+
+[dev-dependencies]
+tempfile = "3.23.0"
+tokio = { version = "1.39", features = ["macros", "rt-multi-thread"] }

crates/integration/mcp-client/src/lib.rs

@@ -0,0 +1,273 @@
+use color_eyre::eyre::{Result, eyre};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use std::process::Stdio;
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+use tokio::process::{Child, Command};
+use tokio::sync::Mutex;
+
+/// JSON-RPC 2.0 request
+#[derive(Debug, Serialize)]
+struct JsonRpcRequest {
+    jsonrpc: String,
+    id: u64,
+    method: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    params: Option<Value>,
+}
+
+/// JSON-RPC 2.0 response
+#[derive(Debug, Deserialize)]
+#[allow(dead_code)] // jsonrpc field required for protocol compliance
+struct JsonRpcResponse {
+    jsonrpc: String,
+    id: u64,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    result: Option<Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    error: Option<JsonRpcError>,
+}
+
+#[derive(Debug, Deserialize)]
+struct JsonRpcError {
+    code: i32,
+    message: String,
+}
+
+/// MCP server capabilities
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ServerCapabilities {
+    #[serde(default)]
+    pub tools: Option<ToolsCapability>,
+    #[serde(default)]
+    pub resources: Option<ResourcesCapability>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ToolsCapability {
+    #[serde(default)]
+    pub list_changed: Option<bool>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ResourcesCapability {
+    #[serde(default)]
+    pub subscribe: Option<bool>,
+    #[serde(default)]
+    pub list_changed: Option<bool>,
+}
+
+/// MCP Tool definition
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct McpTool {
+    pub name: String,
+    #[serde(default)]
+    pub description: Option<String>,
+    #[serde(default)]
+    pub input_schema: Option<Value>,
+}
+
+/// MCP Resource definition
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct McpResource {
+    pub uri: String,
+    #[serde(default)]
+    pub name: Option<String>,
+    #[serde(default)]
+    pub description: Option<String>,
+    #[serde(default)]
+    pub mime_type: Option<String>,
+}
+
+/// MCP Client over stdio transport
+pub struct McpClient {
+    process: Mutex<Child>,
+    next_id: Mutex<u64>,
+    server_name: String,
+}
+
+impl McpClient {
+    /// Create a new MCP client by spawning a subprocess
+    pub async fn spawn(command: &str, args: &[&str], server_name: &str) -> Result<Self> {
+        let mut child = Command::new(command)
+            .args(args)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()?;
+
+        // Verify process is running
+        if child.try_wait()?.is_some() {
+            return Err(eyre!("MCP server process exited immediately"));
+        }
+
+        Ok(Self {
+            process: Mutex::new(child),
+            next_id: Mutex::new(1),
+            server_name: server_name.to_string(),
+        })
+    }
+
+    /// Initialize the MCP connection
+    pub async fn initialize(&self) -> Result<ServerCapabilities> {
+        let params = serde_json::json!({
+            "protocolVersion": "2024-11-05",
+            "capabilities": {
+                "roots": {
+                    "listChanged": true
+                }
+            },
+            "clientInfo": {
+                "name": "owlen",
+                "version": env!("CARGO_PKG_VERSION")
+            }
+        });
+
+        let response = self.send_request("initialize", Some(params)).await?;
+
+        let capabilities = response
+            .get("capabilities")
+            .ok_or_else(|| eyre!("No capabilities in initialize response"))?;
+
+        Ok(serde_json::from_value(capabilities.clone())?)
+    }
+
+    /// List available tools
+    pub async fn list_tools(&self) -> Result<Vec<McpTool>> {
+        let response = self.send_request("tools/list", None).await?;
+
+        let tools = response
+            .get("tools")
+            .ok_or_else(|| eyre!("No tools in response"))?;
+
+        Ok(serde_json::from_value(tools.clone())?)
+    }
+
+    /// Call a tool
+    pub async fn call_tool(&self, name: &str, arguments: Value) -> Result<Value> {
+        let params = serde_json::json!({
+            "name": name,
+            "arguments": arguments
+        });
+
+        let response = self.send_request("tools/call", Some(params)).await?;
+
+        response
+            .get("content")
+            .cloned()
+            .ok_or_else(|| eyre!("No content in tool call response"))
+    }
+
+    /// List available resources
+    pub async fn list_resources(&self) -> Result<Vec<McpResource>> {
+        let response = self.send_request("resources/list", None).await?;
+
+        let resources = response
+            .get("resources")
+            .ok_or_else(|| eyre!("No resources in response"))?;
+
+        Ok(serde_json::from_value(resources.clone())?)
+    }
+
+    /// Read a resource
+    pub async fn read_resource(&self, uri: &str) -> Result<Value> {
+        let params = serde_json::json!({
+            "uri": uri
+        });
+
+        let response = self.send_request("resources/read", Some(params)).await?;
+
+        response
+            .get("contents")
+            .cloned()
+            .ok_or_else(|| eyre!("No contents in resource read response"))
+    }
+
+    /// Get the server name
+    pub fn server_name(&self) -> &str {
+        &self.server_name
+    }
+
+    /// Send a JSON-RPC request and get the response
+    async fn send_request(&self, method: &str, params: Option<Value>) -> Result<Value> {
+        let mut next_id = self.next_id.lock().await;
+        let id = *next_id;
+        *next_id += 1;
+        drop(next_id);
+
+        let request = JsonRpcRequest {
+            jsonrpc: "2.0".to_string(),
+            id,
+            method: method.to_string(),
+            params,
+        };
+
+        let request_json = serde_json::to_string(&request)?;
+
+        let mut process = self.process.lock().await;
+
+        // Write request
+        let stdin = process.stdin.as_mut().ok_or_else(|| eyre!("No stdin"))?;
+        stdin.write_all(request_json.as_bytes()).await?;
+        stdin.write_all(b"\n").await?;
+        stdin.flush().await?;
+
+        // Read response
+        let stdout = process.stdout.take().ok_or_else(|| eyre!("No stdout"))?;
+        let mut reader = BufReader::new(stdout);
+        let mut response_line = String::new();
+        reader.read_line(&mut response_line).await?;
+
+        // Put stdout back
+        process.stdout = Some(reader.into_inner());
+
+        drop(process);
+
+        let response: JsonRpcResponse = serde_json::from_str(&response_line)?;
+
+        if response.id != id {
+            return Err(eyre!("Response ID mismatch: expected {}, got {}", id, response.id));
+        }
+
+        if let Some(error) = response.error {
+            return Err(eyre!("MCP error {}: {}", error.code, error.message));
+        }
+
+        response.result.ok_or_else(|| eyre!("No result in response"))
+    }
+
+    /// Close the MCP connection
+    pub async fn close(self) -> Result<()> {
+        let mut process = self.process.into_inner();
+
+        // Close stdin to signal the server to exit
+        drop(process.stdin.take());
+
+        // Wait for process to exit (with timeout)
+        tokio::time::timeout(
+            std::time::Duration::from_secs(5),
+            process.wait()
+        ).await??;
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn jsonrpc_request_serializes() {
+        let req = JsonRpcRequest {
+            jsonrpc: "2.0".to_string(),
+            id: 1,
+            method: "test".to_string(),
+            params: Some(serde_json::json!({"key": "value"})),
+        };
+
+        let json = serde_json::to_string(&req).unwrap();
+        assert!(json.contains("\"method\":\"test\""));
+        assert!(json.contains("\"id\":1"));
+    }
+}

crates/integration/mcp-client/tests/mcp.rs

@@ -0,0 +1,347 @@
+use mcp_client::McpClient;
+use std::fs;
+use tempfile::tempdir;
+
+#[tokio::test]
+async fn mcp_server_capability_negotiation() {
+    // Create a mock MCP server script
+    let dir = tempdir().unwrap();
+    let server_script = dir.path().join("mock_server.py");
+
+    let script_content = r#"#!/usr/bin/env python3
+import sys
+import json
+
+def read_request():
+    line = sys.stdin.readline()
+    return json.loads(line)
+
+def send_response(response):
+    sys.stdout.write(json.dumps(response) + '\n')
+    sys.stdout.flush()
+
+# Main loop
+while True:
+    try:
+        req = read_request()
+        method = req.get('method')
+        req_id = req.get('id')
+
+        if method == 'initialize':
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'result': {
+                    'protocolVersion': '2024-11-05',
+                    'capabilities': {
+                        'tools': {'list_changed': True},
+                        'resources': {'subscribe': False}
+                    },
+                    'serverInfo': {
+                        'name': 'test-server',
+                        'version': '1.0.0'
+                    }
+                }
+            })
+        elif method == 'tools/list':
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'result': {
+                    'tools': []
+                }
+            })
+        else:
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'error': {
+                    'code': -32601,
+                    'message': f'Method not found: {method}'
+                }
+            })
+    except EOFError:
+        break
+    except Exception as e:
+        sys.stderr.write(f'Error: {e}\n')
+        break
+"#;
+
+    fs::write(&server_script, script_content).unwrap();
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        fs::set_permissions(&server_script, std::fs::Permissions::from_mode(0o755)).unwrap();
+    }
+
+    // Connect to the server
+    let client = McpClient::spawn(
+        "python3",
+        &[server_script.to_str().unwrap()],
+        "test-server"
+    ).await.unwrap();
+
+    // Initialize
+    let capabilities = client.initialize().await.unwrap();
+
+    // Verify capabilities
+    assert!(capabilities.tools.is_some());
+    assert_eq!(capabilities.tools.unwrap().list_changed, Some(true));
+
+    client.close().await.unwrap();
+}
+
+#[tokio::test]
+async fn mcp_tool_invocation() {
+    let dir = tempdir().unwrap();
+    let server_script = dir.path().join("mock_server.py");
+
+    let script_content = r#"#!/usr/bin/env python3
+import sys
+import json
+
+def read_request():
+    line = sys.stdin.readline()
+    return json.loads(line)
+
+def send_response(response):
+    sys.stdout.write(json.dumps(response) + '\n')
+    sys.stdout.flush()
+
+while True:
+    try:
+        req = read_request()
+        method = req.get('method')
+        req_id = req.get('id')
+        params = req.get('params', {})
+
+        if method == 'initialize':
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'result': {
+                    'protocolVersion': '2024-11-05',
+                    'capabilities': {
+                        'tools': {}
+                    },
+                    'serverInfo': {
+                        'name': 'test-server',
+                        'version': '1.0.0'
+                    }
+                }
+            })
+        elif method == 'tools/list':
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'result': {
+                    'tools': [
+                        {
+                            'name': 'echo',
+                            'description': 'Echo the input',
+                            'input_schema': {
+                                'type': 'object',
+                                'properties': {
+                                    'message': {'type': 'string'}
+                                }
+                            }
+                        }
+                    ]
+                }
+            })
+        elif method == 'tools/call':
+            tool_name = params.get('name')
+            arguments = params.get('arguments', {})
+            if tool_name == 'echo':
+                send_response({
+                    'jsonrpc': '2.0',
+                    'id': req_id,
+                    'result': {
+                        'content': [
+                            {
+                                'type': 'text',
+                                'text': arguments.get('message', '')
+                            }
+                        ]
+                    }
+                })
+            else:
+                send_response({
+                    'jsonrpc': '2.0',
+                    'id': req_id,
+                    'error': {
+                        'code': -32602,
+                        'message': f'Unknown tool: {tool_name}'
+                    }
+                })
+        else:
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'error': {
+                    'code': -32601,
+                    'message': f'Method not found: {method}'
+                }
+            })
+    except EOFError:
+        break
+    except Exception as e:
+        sys.stderr.write(f'Error: {e}\n')
+        break
+"#;
+
+    fs::write(&server_script, script_content).unwrap();
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        fs::set_permissions(&server_script, std::fs::Permissions::from_mode(0o755)).unwrap();
+    }
+
+    let client = McpClient::spawn(
+        "python3",
+        &[server_script.to_str().unwrap()],
+        "test-server"
+    ).await.unwrap();
+
+    client.initialize().await.unwrap();
+
+    // List tools
+    let tools = client.list_tools().await.unwrap();
+    assert_eq!(tools.len(), 1);
+    assert_eq!(tools[0].name, "echo");
+
+    // Call tool
+    let result = client.call_tool(
+        "echo",
+        serde_json::json!({"message": "Hello, MCP!"})
+    ).await.unwrap();
+
+    // Verify result
+    let content = result.as_array().unwrap();
+    assert_eq!(content[0]["text"].as_str().unwrap(), "Hello, MCP!");
+
+    client.close().await.unwrap();
+}
+
+#[tokio::test]
+async fn mcp_resource_reads() {
+    let dir = tempdir().unwrap();
+    let server_script = dir.path().join("mock_server.py");
+
+    let script_content = r#"#!/usr/bin/env python3
+import sys
+import json
+
+def read_request():
+    line = sys.stdin.readline()
+    return json.loads(line)
+
+def send_response(response):
+    sys.stdout.write(json.dumps(response) + '\n')
+    sys.stdout.flush()
+
+while True:
+    try:
+        req = read_request()
+        method = req.get('method')
+        req_id = req.get('id')
+        params = req.get('params', {})
+
+        if method == 'initialize':
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'result': {
+                    'protocolVersion': '2024-11-05',
+                    'capabilities': {
+                        'resources': {}
+                    },
+                    'serverInfo': {
+                        'name': 'test-server',
+                        'version': '1.0.0'
+                    }
+                }
+            })
+        elif method == 'resources/list':
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'result': {
+                    'resources': [
+                        {
+                            'uri': 'file:///test.txt',
+                            'name': 'Test File',
+                            'description': 'A test file',
+                            'mime_type': 'text/plain'
+                        }
+                    ]
+                }
+            })
+        elif method == 'resources/read':
+            uri = params.get('uri')
+            if uri == 'file:///test.txt':
+                send_response({
+                    'jsonrpc': '2.0',
+                    'id': req_id,
+                    'result': {
+                        'contents': [
+                            {
+                                'uri': uri,
+                                'mime_type': 'text/plain',
+                                'text': 'Hello from resource!'
+                            }
+                        ]
+                    }
+                })
+            else:
+                send_response({
+                    'jsonrpc': '2.0',
+                    'id': req_id,
+                    'error': {
+                        'code': -32602,
+                        'message': f'Unknown resource: {uri}'
+                    }
+                })
+        else:
+            send_response({
+                'jsonrpc': '2.0',
+                'id': req_id,
+                'error': {
+                    'code': -32601,
+                    'message': f'Method not found: {method}'
+                }
+            })
+    except EOFError:
+        break
+    except Exception as e:
+        sys.stderr.write(f'Error: {e}\n')
+        break
+"#;
+
+    fs::write(&server_script, script_content).unwrap();
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        fs::set_permissions(&server_script, std::fs::Permissions::from_mode(0o755)).unwrap();
+    }
+
+    let client = McpClient::spawn(
+        "python3",
+        &[server_script.to_str().unwrap()],
+        "test-server"
+    ).await.unwrap();
+
+    client.initialize().await.unwrap();
+
+    // List resources
+    let resources = client.list_resources().await.unwrap();
+    assert_eq!(resources.len(), 1);
+    assert_eq!(resources[0].uri, "file:///test.txt");
+
+    // Read resource
+    let contents = client.read_resource("file:///test.txt").await.unwrap();
+    let contents_array = contents.as_array().unwrap();
+    assert_eq!(contents_array[0]["text"].as_str().unwrap(), "Hello from resource!");
+
+    client.close().await.unwrap();
+}

crates/llm/anthropic/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "llm-anthropic"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+description = "Anthropic Claude API client for Owlen"
+
+[dependencies]
+llm-core = { path = "../core" }
+async-trait = "0.1"
+futures = "0.3"
+reqwest = { version = "0.12", features = ["json", "stream"] }
+reqwest-eventsource = "0.6"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tokio = { version = "1", features = ["sync", "time"] }
+tracing = "0.1"
+uuid = { version = "1.0", features = ["v4"] }

crates/llm/anthropic/README.md

@@ -0,0 +1,15 @@
+# Owlen Anthropic Provider
+
+Anthropic Claude integration for the Owlen AI agent.
+
+## Overview
+This crate provides the implementation of the `LlmProvider` trait for Anthropic's Claude models. It handles the specific API requirements for Claude, including its unique tool calling format and streaming response structure.
+
+## Features
+- **Claude 3.5 Sonnet Support:** Optimized for the latest high-performance models.
+- **Tool Use:** Native integration with Claude's tool calling capabilities.
+- **Streaming:** Efficient real-time response generation using server-sent events.
+- **Token Counting:** Accurate token estimation using Anthropic-specific logic.
+
+## Configuration
+Requires an `ANTHROPIC_API_KEY` to be set in the environment or configuration.

crates/llm/anthropic/src/auth.rs

@@ -0,0 +1,306 @@
+//! Anthropic OAuth Authentication
+//!
+//! Implements device code flow for authenticating with Anthropic without API keys.
+
+use llm_core::{AuthMethod, DeviceAuthResult, DeviceCodeResponse, LlmError, OAuthProvider};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+
+/// OAuth client for Anthropic device flow
+pub struct AnthropicAuth {
+    http: Client,
+    client_id: String,
+}
+
+// Anthropic OAuth endpoints
+// Note: Anthropic doesn't currently have a public OAuth device code flow.
+// These are placeholder endpoints. Users should use API keys instead.
+const AUTH_BASE_URL: &str = "https://console.anthropic.com";
+const DEVICE_CODE_ENDPOINT: &str = "/oauth/device/code";
+const TOKEN_ENDPOINT: &str = "/oauth/token";
+
+// Default client ID for Owlen CLI
+const DEFAULT_CLIENT_ID: &str = "owlen-cli";
+
+// User-Agent to avoid Cloudflare blocks
+const USER_AGENT: &str = concat!("owlen/", env!("CARGO_PKG_VERSION"));
+
+impl AnthropicAuth {
+    /// Create a new OAuth client with the default CLI client ID
+    pub fn new() -> Self {
+        let http = Client::builder()
+            .user_agent(USER_AGENT)
+            .build()
+            .unwrap_or_else(|_| Client::new());
+
+        Self {
+            http,
+            client_id: DEFAULT_CLIENT_ID.to_string(),
+        }
+    }
+
+    /// Create with a custom client ID
+    pub fn with_client_id(client_id: impl Into<String>) -> Self {
+        let http = Client::builder()
+            .user_agent(USER_AGENT)
+            .build()
+            .unwrap_or_else(|_| Client::new());
+
+        Self {
+            http,
+            client_id: client_id.into(),
+        }
+    }
+
+    /// Check if OAuth is available for Anthropic
+    /// Currently, Anthropic doesn't provide public OAuth for third-party CLI tools.
+    pub fn is_oauth_available() -> bool {
+        false
+    }
+}
+
+impl Default for AnthropicAuth {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(Debug, Serialize)]
+struct DeviceCodeRequest<'a> {
+    client_id: &'a str,
+    scope: &'a str,
+}
+
+#[derive(Debug, Deserialize)]
+struct DeviceCodeApiResponse {
+    device_code: String,
+    user_code: String,
+    verification_uri: String,
+    verification_uri_complete: Option<String>,
+    expires_in: u64,
+    interval: u64,
+}
+
+#[derive(Debug, Serialize)]
+struct TokenRequest<'a> {
+    client_id: &'a str,
+    device_code: &'a str,
+    grant_type: &'a str,
+}
+
+#[derive(Debug, Deserialize)]
+struct TokenApiResponse {
+    access_token: String,
+    #[allow(dead_code)]
+    token_type: String,
+    expires_in: Option<u64>,
+    refresh_token: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+struct TokenErrorResponse {
+    error: String,
+    error_description: Option<String>,
+}
+
+#[async_trait::async_trait]
+impl OAuthProvider for AnthropicAuth {
+    async fn start_device_auth(&self) -> Result<DeviceCodeResponse, LlmError> {
+        let url = format!("{}{}", AUTH_BASE_URL, DEVICE_CODE_ENDPOINT);
+
+        let request = DeviceCodeRequest {
+            client_id: &self.client_id,
+            scope: "api:read api:write", // Request API access
+        };
+
+        let response = self
+            .http
+            .post(&url)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let text = response
+                .text()
+                .await
+                .unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(LlmError::Auth(format!(
+                "Device code request failed ({}): {}",
+                status, text
+            )));
+        }
+
+        let api_response: DeviceCodeApiResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        Ok(DeviceCodeResponse {
+            device_code: api_response.device_code,
+            user_code: api_response.user_code,
+            verification_uri: api_response.verification_uri,
+            verification_uri_complete: api_response.verification_uri_complete,
+            expires_in: api_response.expires_in,
+            interval: api_response.interval,
+        })
+    }
+
+    async fn poll_device_auth(&self, device_code: &str) -> Result<DeviceAuthResult, LlmError> {
+        let url = format!("{}{}", AUTH_BASE_URL, TOKEN_ENDPOINT);
+
+        let request = TokenRequest {
+            client_id: &self.client_id,
+            device_code,
+            grant_type: "urn:ietf:params:oauth:grant-type:device_code",
+        };
+
+        let response = self
+            .http
+            .post(&url)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if response.status().is_success() {
+            let token_response: TokenApiResponse = response
+                .json()
+                .await
+                .map_err(|e| LlmError::Json(e.to_string()))?;
+
+            return Ok(DeviceAuthResult::Success {
+                access_token: token_response.access_token,
+                refresh_token: token_response.refresh_token,
+                expires_in: token_response.expires_in,
+            });
+        }
+
+        // Parse error response
+        let error_response: TokenErrorResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        match error_response.error.as_str() {
+            "authorization_pending" => Ok(DeviceAuthResult::Pending),
+            "slow_down" => Ok(DeviceAuthResult::Pending), // Treat as pending, caller should slow down
+            "access_denied" => Ok(DeviceAuthResult::Denied),
+            "expired_token" => Ok(DeviceAuthResult::Expired),
+            _ => Err(LlmError::Auth(format!(
+                "Token request failed: {} - {}",
+                error_response.error,
+                error_response.error_description.unwrap_or_default()
+            ))),
+        }
+    }
+
+    async fn refresh_token(&self, refresh_token: &str) -> Result<AuthMethod, LlmError> {
+        let url = format!("{}{}", AUTH_BASE_URL, TOKEN_ENDPOINT);
+
+        #[derive(Serialize)]
+        struct RefreshRequest<'a> {
+            client_id: &'a str,
+            refresh_token: &'a str,
+            grant_type: &'a str,
+        }
+
+        let request = RefreshRequest {
+            client_id: &self.client_id,
+            refresh_token,
+            grant_type: "refresh_token",
+        };
+
+        let response = self
+            .http
+            .post(&url)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if !response.status().is_success() {
+            let text = response
+                .text()
+                .await
+                .unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(LlmError::Auth(format!("Token refresh failed: {}", text)));
+        }
+
+        let token_response: TokenApiResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        let expires_at = token_response.expires_in.map(|secs| {
+            std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .map(|d| d.as_secs() + secs)
+                .unwrap_or(0)
+        });
+
+        Ok(AuthMethod::OAuth {
+            access_token: token_response.access_token,
+            refresh_token: token_response.refresh_token,
+            expires_at,
+        })
+    }
+}
+
+/// Helper to perform the full device auth flow with polling
+pub async fn perform_device_auth<F>(
+    auth: &AnthropicAuth,
+    on_code: F,
+) -> Result<AuthMethod, LlmError>
+where
+    F: FnOnce(&DeviceCodeResponse),
+{
+    // Start the device flow
+    let device_code = auth.start_device_auth().await?;
+
+    // Let caller display the code to user
+    on_code(&device_code);
+
+    // Poll for completion
+    let poll_interval = std::time::Duration::from_secs(device_code.interval);
+    let deadline =
+        std::time::Instant::now() + std::time::Duration::from_secs(device_code.expires_in);
+
+    loop {
+        if std::time::Instant::now() > deadline {
+            return Err(LlmError::Auth("Device code expired".to_string()));
+        }
+
+        tokio::time::sleep(poll_interval).await;
+
+        match auth.poll_device_auth(&device_code.device_code).await? {
+            DeviceAuthResult::Success {
+                access_token,
+                refresh_token,
+                expires_in,
+            } => {
+                let expires_at = expires_in.map(|secs| {
+                    std::time::SystemTime::now()
+                        .duration_since(std::time::UNIX_EPOCH)
+                        .map(|d| d.as_secs() + secs)
+                        .unwrap_or(0)
+                });
+
+                return Ok(AuthMethod::OAuth {
+                    access_token,
+                    refresh_token,
+                    expires_at,
+                });
+            }
+            DeviceAuthResult::Pending => continue,
+            DeviceAuthResult::Denied => {
+                return Err(LlmError::Auth("Authorization denied by user".to_string()));
+            }
+            DeviceAuthResult::Expired => {
+                return Err(LlmError::Auth("Device code expired".to_string()));
+            }
+        }
+    }
+}

crates/llm/anthropic/src/client.rs

@@ -0,0 +1,577 @@
+//! Anthropic Claude API Client
+//!
+//! Implements the Messages API with streaming support.
+
+use crate::types::*;
+use async_trait::async_trait;
+use futures::StreamExt;
+use llm_core::{
+    AccountInfo, AuthMethod, ChatMessage, ChatOptions, ChatResponse, ChunkStream, FunctionCall,
+    LlmError, LlmProvider, ModelInfo, ProviderInfo, ProviderStatus, Role, StreamChunk, Tool,
+    ToolCall, ToolCallDelta, Usage, UsageStats,
+};
+use reqwest::Client;
+use reqwest_eventsource::{Event, EventSource};
+use std::sync::Arc;
+use tokio::sync::Mutex;
+
+const API_BASE_URL: &str = "https://api.anthropic.com";
+const MESSAGES_ENDPOINT: &str = "/v1/messages";
+const API_VERSION: &str = "2023-06-01";
+const DEFAULT_MAX_TOKENS: u32 = 8192;
+
+/// Anthropic Claude API client
+pub struct AnthropicClient {
+    http: Client,
+    auth: AuthMethod,
+    model: String,
+}
+
+impl AnthropicClient {
+    /// Create a new client with API key authentication
+    pub fn new(api_key: impl Into<String>) -> Self {
+        Self {
+            http: Client::new(),
+            auth: AuthMethod::api_key(api_key),
+            model: "claude-sonnet-4-20250514".to_string(),
+        }
+    }
+
+    /// Create a new client with OAuth token
+    pub fn with_oauth(access_token: impl Into<String>) -> Self {
+        Self {
+            http: Client::new(),
+            auth: AuthMethod::oauth(access_token),
+            model: "claude-sonnet-4-20250514".to_string(),
+        }
+    }
+
+    /// Create a new client with full AuthMethod
+    pub fn with_auth(auth: AuthMethod) -> Self {
+        Self {
+            http: Client::new(),
+            auth,
+            model: "claude-sonnet-4-20250514".to_string(),
+        }
+    }
+
+    /// Set the model to use
+    pub fn with_model(mut self, model: impl Into<String>) -> Self {
+        self.model = model.into();
+        self
+    }
+
+    /// Get current auth method (for token refresh)
+    pub fn auth(&self) -> &AuthMethod {
+        &self.auth
+    }
+
+    /// Update the auth method (after refresh)
+    pub fn set_auth(&mut self, auth: AuthMethod) {
+        self.auth = auth;
+    }
+
+    /// Convert messages to Anthropic format, extracting system message
+    fn prepare_messages(messages: &[ChatMessage]) -> (Option<String>, Vec<AnthropicMessage>) {
+        let mut system_content = None;
+        let mut anthropic_messages = Vec::new();
+
+        for msg in messages {
+            if msg.role == Role::System {
+                // Collect system messages
+                if let Some(content) = &msg.content {
+                    if let Some(existing) = &mut system_content {
+                        *existing = format!("{}\n\n{}", existing, content);
+                    } else {
+                        system_content = Some(content.clone());
+                    }
+                }
+            } else {
+                anthropic_messages.push(AnthropicMessage::from(msg));
+            }
+        }
+
+        (system_content, anthropic_messages)
+    }
+
+    /// Convert tools to Anthropic format
+    fn prepare_tools(tools: Option<&[Tool]>) -> Option<Vec<AnthropicTool>> {
+        tools.map(|t| t.iter().map(AnthropicTool::from).collect())
+    }
+}
+
+#[async_trait]
+impl LlmProvider for AnthropicClient {
+    fn name(&self) -> &str {
+        "anthropic"
+    }
+
+    fn model(&self) -> &str {
+        &self.model
+    }
+
+    async fn chat_stream(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChunkStream, LlmError> {
+        let url = format!("{}{}", API_BASE_URL, MESSAGES_ENDPOINT);
+
+        let model = if options.model.is_empty() {
+            &self.model
+        } else {
+            &options.model
+        };
+
+        let (system, anthropic_messages) = Self::prepare_messages(messages);
+        let anthropic_tools = Self::prepare_tools(tools);
+
+        let request = MessagesRequest {
+            model,
+            messages: anthropic_messages,
+            max_tokens: options.max_tokens.unwrap_or(DEFAULT_MAX_TOKENS),
+            system: system.as_deref(),
+            temperature: options.temperature,
+            top_p: options.top_p,
+            stop_sequences: options.stop.as_deref(),
+            tools: anthropic_tools,
+            stream: true,
+        };
+
+        let bearer = self
+            .auth
+            .bearer_token()
+            .ok_or_else(|| LlmError::Auth("No authentication configured".to_string()))?;
+
+        // Build the SSE request
+        let req = self
+            .http
+            .post(&url)
+            .header("x-api-key", bearer)
+            .header("anthropic-version", API_VERSION)
+            .header("content-type", "application/json")
+            .json(&request);
+
+        let es = EventSource::new(req).map_err(|e| LlmError::Http(e.to_string()))?;
+
+        // State for accumulating tool calls across deltas
+        let tool_state: Arc<Mutex<Vec<PartialToolCall>>> = Arc::new(Mutex::new(Vec::new()));
+
+        let stream = es.filter_map(move |event| {
+            let tool_state = Arc::clone(&tool_state);
+            async move {
+                match event {
+                    Ok(Event::Open) => None,
+                    Ok(Event::Message(msg)) => {
+                        // Parse the SSE data as JSON
+                        let event: StreamEvent = match serde_json::from_str(&msg.data) {
+                            Ok(e) => e,
+                            Err(e) => {
+                                tracing::warn!("Failed to parse SSE event: {}", e);
+                                return None;
+                            }
+                        };
+
+                        convert_stream_event(event, &tool_state).await
+                    }
+                    Err(reqwest_eventsource::Error::StreamEnded) => None,
+                    Err(e) => Some(Err(LlmError::Stream(e.to_string()))),
+                }
+            }
+        });
+
+        Ok(Box::pin(stream))
+    }
+
+    async fn chat(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChatResponse, LlmError> {
+        let url = format!("{}{}", API_BASE_URL, MESSAGES_ENDPOINT);
+
+        let model = if options.model.is_empty() {
+            &self.model
+        } else {
+            &options.model
+        };
+
+        let (system, anthropic_messages) = Self::prepare_messages(messages);
+        let anthropic_tools = Self::prepare_tools(tools);
+
+        let request = MessagesRequest {
+            model,
+            messages: anthropic_messages,
+            max_tokens: options.max_tokens.unwrap_or(DEFAULT_MAX_TOKENS),
+            system: system.as_deref(),
+            temperature: options.temperature,
+            top_p: options.top_p,
+            stop_sequences: options.stop.as_deref(),
+            tools: anthropic_tools,
+            stream: false,
+        };
+
+        let bearer = self
+            .auth
+            .bearer_token()
+            .ok_or_else(|| LlmError::Auth("No authentication configured".to_string()))?;
+
+        let response = self
+            .http
+            .post(&url)
+            .header("x-api-key", bearer)
+            .header("anthropic-version", API_VERSION)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let text = response
+                .text()
+                .await
+                .unwrap_or_else(|_| "Unknown error".to_string());
+
+            // Check for rate limiting
+            if status == reqwest::StatusCode::TOO_MANY_REQUESTS {
+                return Err(LlmError::RateLimit {
+                    retry_after_secs: None,
+                });
+            }
+
+            return Err(LlmError::Api {
+                message: text,
+                code: Some(status.to_string()),
+            });
+        }
+
+        let api_response: MessagesResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        // Convert response to common format
+        let mut content = String::new();
+        let mut tool_calls = Vec::new();
+
+        for block in api_response.content {
+            match block {
+                ResponseContentBlock::Text { text } => {
+                    content.push_str(&text);
+                }
+                ResponseContentBlock::ToolUse { id, name, input } => {
+                    tool_calls.push(ToolCall {
+                        id,
+                        call_type: "function".to_string(),
+                        function: FunctionCall {
+                            name,
+                            arguments: input,
+                        },
+                    });
+                }
+            }
+        }
+
+        let usage = api_response.usage.map(|u| Usage {
+            prompt_tokens: u.input_tokens,
+            completion_tokens: u.output_tokens,
+            total_tokens: u.input_tokens + u.output_tokens,
+        });
+
+        Ok(ChatResponse {
+            content: if content.is_empty() {
+                None
+            } else {
+                Some(content)
+            },
+            tool_calls: if tool_calls.is_empty() {
+                None
+            } else {
+                Some(tool_calls)
+            },
+            usage,
+        })
+    }
+}
+
+/// Helper struct for accumulating streaming tool calls
+#[derive(Default)]
+struct PartialToolCall {
+    #[allow(dead_code)]
+    id: String,
+    #[allow(dead_code)]
+    name: String,
+    input_json: String,
+}
+
+/// Convert an Anthropic stream event to our common StreamChunk format
+async fn convert_stream_event(
+    event: StreamEvent,
+    tool_state: &Arc<Mutex<Vec<PartialToolCall>>>,
+) -> Option<Result<StreamChunk, LlmError>> {
+    match event {
+        StreamEvent::ContentBlockStart {
+            index,
+            content_block,
+        } => {
+            match content_block {
+                ContentBlockStartInfo::Text { text } => {
+                    if text.is_empty() {
+                        None
+                    } else {
+                        Some(Ok(StreamChunk {
+                            content: Some(text),
+                            tool_calls: None,
+                            done: false,
+                            usage: None,
+                        }))
+                    }
+                }
+                ContentBlockStartInfo::ToolUse { id, name } => {
+                    // Store the tool call start
+                    let mut state = tool_state.lock().await;
+                    while state.len() <= index {
+                        state.push(PartialToolCall::default());
+                    }
+                    state[index] = PartialToolCall {
+                        id: id.clone(),
+                        name: name.clone(),
+                        input_json: String::new(),
+                    };
+
+                    Some(Ok(StreamChunk {
+                        content: None,
+                        tool_calls: Some(vec![ToolCallDelta {
+                            index,
+                            id: Some(id),
+                            function_name: Some(name),
+                            arguments_delta: None,
+                        }]),
+                        done: false,
+                        usage: None,
+                    }))
+                }
+            }
+        }
+
+        StreamEvent::ContentBlockDelta { index, delta } => match delta {
+            ContentDelta::TextDelta { text } => Some(Ok(StreamChunk {
+                content: Some(text),
+                tool_calls: None,
+                done: false,
+                usage: None,
+            })),
+            ContentDelta::InputJsonDelta { partial_json } => {
+                // Accumulate the JSON
+                let mut state = tool_state.lock().await;
+                if index < state.len() {
+                    state[index].input_json.push_str(&partial_json);
+                }
+
+                Some(Ok(StreamChunk {
+                    content: None,
+                    tool_calls: Some(vec![ToolCallDelta {
+                        index,
+                        id: None,
+                        function_name: None,
+                        arguments_delta: Some(partial_json),
+                    }]),
+                    done: false,
+                    usage: None,
+                }))
+            }
+        },
+
+        StreamEvent::MessageDelta { usage, .. } => {
+            let u = usage.map(|u| Usage {
+                prompt_tokens: u.input_tokens,
+                completion_tokens: u.output_tokens,
+                total_tokens: u.input_tokens + u.output_tokens,
+            });
+
+            Some(Ok(StreamChunk {
+                content: None,
+                tool_calls: None,
+                done: false,
+                usage: u,
+            }))
+        }
+
+        StreamEvent::MessageStop => Some(Ok(StreamChunk {
+            content: None,
+            tool_calls: None,
+            done: true,
+            usage: None,
+        })),
+
+        StreamEvent::Error { error } => Some(Err(LlmError::Api {
+            message: error.message,
+            code: Some(error.error_type),
+        })),
+
+        // Ignore other events
+        StreamEvent::MessageStart { .. }
+        | StreamEvent::ContentBlockStop { .. }
+        | StreamEvent::Ping => None,
+    }
+}
+
+// ============================================================================
+// ProviderInfo Implementation
+// ============================================================================
+
+/// Known Claude models with their specifications
+fn get_claude_models() -> Vec<ModelInfo> {
+    vec![
+        ModelInfo {
+            id: "claude-opus-4-20250514".to_string(),
+            display_name: Some("Claude Opus 4".to_string()),
+            description: Some("Most capable model for complex tasks".to_string()),
+            context_window: Some(200_000),
+            max_output_tokens: Some(32_000),
+            supports_tools: true,
+            supports_vision: true,
+            input_price_per_mtok: Some(15.0),
+            output_price_per_mtok: Some(75.0),
+        },
+        ModelInfo {
+            id: "claude-sonnet-4-20250514".to_string(),
+            display_name: Some("Claude Sonnet 4".to_string()),
+            description: Some("Best balance of performance and speed".to_string()),
+            context_window: Some(200_000),
+            max_output_tokens: Some(64_000),
+            supports_tools: true,
+            supports_vision: true,
+            input_price_per_mtok: Some(3.0),
+            output_price_per_mtok: Some(15.0),
+        },
+        ModelInfo {
+            id: "claude-haiku-3-5-20241022".to_string(),
+            display_name: Some("Claude 3.5 Haiku".to_string()),
+            description: Some("Fast and affordable for simple tasks".to_string()),
+            context_window: Some(200_000),
+            max_output_tokens: Some(8_192),
+            supports_tools: true,
+            supports_vision: true,
+            input_price_per_mtok: Some(0.80),
+            output_price_per_mtok: Some(4.0),
+        },
+    ]
+}
+
+#[async_trait]
+impl ProviderInfo for AnthropicClient {
+    async fn status(&self) -> Result<ProviderStatus, LlmError> {
+        let authenticated = self.auth.bearer_token().is_some();
+
+        // Try to reach the API with a simple request
+        let reachable = if authenticated {
+            // Test with a minimal message to verify auth works
+            let test_messages = vec![ChatMessage::user("Hi")];
+            let test_opts = ChatOptions::new(&self.model).with_max_tokens(1);
+
+            match self.chat(&test_messages, &test_opts, None).await {
+                Ok(_) => true,
+                Err(LlmError::Auth(_)) => false, // Auth failed
+                Err(_) => true,                  // Other errors mean API is reachable
+            }
+        } else {
+            false
+        };
+
+        let account = if authenticated && reachable {
+            self.account_info().await.ok().flatten()
+        } else {
+            None
+        };
+
+        let message = if !authenticated {
+            Some("Not authenticated - run 'owlen login anthropic' to authenticate".to_string())
+        } else if !reachable {
+            Some("Cannot reach Anthropic API".to_string())
+        } else {
+            Some("Connected".to_string())
+        };
+
+        Ok(ProviderStatus {
+            provider: "anthropic".to_string(),
+            authenticated,
+            account,
+            model: self.model.clone(),
+            endpoint: API_BASE_URL.to_string(),
+            reachable,
+            message,
+        })
+    }
+
+    async fn account_info(&self) -> Result<Option<AccountInfo>, LlmError> {
+        // Anthropic doesn't have a public account info endpoint
+        // Return None - account info would come from OAuth token claims
+        Ok(None)
+    }
+
+    async fn usage_stats(&self) -> Result<Option<UsageStats>, LlmError> {
+        // Anthropic doesn't expose usage stats via API
+        // This would require the admin/billing API with different auth
+        Ok(None)
+    }
+
+    async fn list_models(&self) -> Result<Vec<ModelInfo>, LlmError> {
+        // Return known models - Anthropic doesn't have a models list endpoint
+        Ok(get_claude_models())
+    }
+
+    async fn model_info(&self, model_id: &str) -> Result<Option<ModelInfo>, LlmError> {
+        let models = get_claude_models();
+        Ok(models.into_iter().find(|m| m.id == model_id))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use llm_core::ToolParameters;
+    use serde_json::json;
+
+    #[test]
+    fn test_message_conversion() {
+        let messages = vec![
+            ChatMessage::system("You are helpful"),
+            ChatMessage::user("Hello"),
+            ChatMessage::assistant("Hi there!"),
+        ];
+
+        let (system, anthropic_msgs) = AnthropicClient::prepare_messages(&messages);
+
+        assert_eq!(system, Some("You are helpful".to_string()));
+        assert_eq!(anthropic_msgs.len(), 2);
+        assert_eq!(anthropic_msgs[0].role, "user");
+        assert_eq!(anthropic_msgs[1].role, "assistant");
+    }
+
+    #[test]
+    fn test_tool_conversion() {
+        let tools = vec![Tool::function(
+            "read_file",
+            "Read a file's contents",
+            ToolParameters::object(
+                json!({
+                    "path": {
+                        "type": "string",
+                        "description": "File path"
+                    }
+                }),
+                vec!["path".to_string()],
+            ),
+        )];
+
+        let anthropic_tools = AnthropicClient::prepare_tools(Some(&tools)).unwrap();
+
+        assert_eq!(anthropic_tools.len(), 1);
+        assert_eq!(anthropic_tools[0].name, "read_file");
+        assert_eq!(anthropic_tools[0].description, "Read a file's contents");
+    }
+}

crates/llm/anthropic/src/lib.rs

@@ -0,0 +1,12 @@
+//! Anthropic Claude API Client
+//!
+//! Implements the LlmProvider trait for Anthropic's Claude models.
+//! Supports both API key authentication and OAuth device flow.
+
+mod auth;
+mod client;
+mod types;
+
+pub use auth::*;
+pub use client::*;
+pub use types::*;

crates/llm/anthropic/src/types.rs

@@ -0,0 +1,276 @@
+//! Anthropic API request/response types
+
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+
+// ============================================================================
+// Request Types
+// ============================================================================
+
+#[derive(Debug, Serialize)]
+pub struct MessagesRequest<'a> {
+    pub model: &'a str,
+    pub messages: Vec<AnthropicMessage>,
+    pub max_tokens: u32,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub system: Option<&'a str>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub temperature: Option<f32>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub top_p: Option<f32>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub stop_sequences: Option<&'a [String]>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tools: Option<Vec<AnthropicTool>>,
+
+    pub stream: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnthropicMessage {
+    pub role: String, // "user" or "assistant"
+    pub content: AnthropicContent,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum AnthropicContent {
+    Text(String),
+    Blocks(Vec<ContentBlock>),
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type")]
+pub enum ContentBlock {
+    #[serde(rename = "text")]
+    Text { text: String },
+
+    #[serde(rename = "tool_use")]
+    ToolUse {
+        id: String,
+        name: String,
+        input: Value,
+    },
+
+    #[serde(rename = "tool_result")]
+    ToolResult {
+        tool_use_id: String,
+        content: String,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        is_error: Option<bool>,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnthropicTool {
+    pub name: String,
+    pub description: String,
+    pub input_schema: ToolInputSchema,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolInputSchema {
+    #[serde(rename = "type")]
+    pub schema_type: String,
+    pub properties: Value,
+    pub required: Vec<String>,
+}
+
+// ============================================================================
+// Response Types
+// ============================================================================
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct MessagesResponse {
+    pub id: String,
+    #[serde(rename = "type")]
+    pub response_type: String,
+    pub role: String,
+    pub content: Vec<ResponseContentBlock>,
+    pub model: String,
+    pub stop_reason: Option<String>,
+    pub usage: Option<UsageInfo>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type")]
+pub enum ResponseContentBlock {
+    #[serde(rename = "text")]
+    Text { text: String },
+
+    #[serde(rename = "tool_use")]
+    ToolUse {
+        id: String,
+        name: String,
+        input: Value,
+    },
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct UsageInfo {
+    pub input_tokens: u32,
+    pub output_tokens: u32,
+}
+
+// ============================================================================
+// Streaming Event Types
+// ============================================================================
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type")]
+pub enum StreamEvent {
+    #[serde(rename = "message_start")]
+    MessageStart { message: MessageStartInfo },
+
+    #[serde(rename = "content_block_start")]
+    ContentBlockStart {
+        index: usize,
+        content_block: ContentBlockStartInfo,
+    },
+
+    #[serde(rename = "content_block_delta")]
+    ContentBlockDelta { index: usize, delta: ContentDelta },
+
+    #[serde(rename = "content_block_stop")]
+    ContentBlockStop { index: usize },
+
+    #[serde(rename = "message_delta")]
+    MessageDelta {
+        delta: MessageDeltaInfo,
+        usage: Option<UsageInfo>,
+    },
+
+    #[serde(rename = "message_stop")]
+    MessageStop,
+
+    #[serde(rename = "ping")]
+    Ping,
+
+    #[serde(rename = "error")]
+    Error { error: ApiError },
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct MessageStartInfo {
+    pub id: String,
+    #[serde(rename = "type")]
+    pub message_type: String,
+    pub role: String,
+    pub model: String,
+    pub usage: Option<UsageInfo>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type")]
+pub enum ContentBlockStartInfo {
+    #[serde(rename = "text")]
+    Text { text: String },
+
+    #[serde(rename = "tool_use")]
+    ToolUse { id: String, name: String },
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(tag = "type")]
+pub enum ContentDelta {
+    #[serde(rename = "text_delta")]
+    TextDelta { text: String },
+
+    #[serde(rename = "input_json_delta")]
+    InputJsonDelta { partial_json: String },
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct MessageDeltaInfo {
+    pub stop_reason: Option<String>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ApiError {
+    #[serde(rename = "type")]
+    pub error_type: String,
+    pub message: String,
+}
+
+// ============================================================================
+// Conversions
+// ============================================================================
+
+impl From<&llm_core::Tool> for AnthropicTool {
+    fn from(tool: &llm_core::Tool) -> Self {
+        Self {
+            name: tool.function.name.clone(),
+            description: tool.function.description.clone(),
+            input_schema: ToolInputSchema {
+                schema_type: tool.function.parameters.param_type.clone(),
+                properties: tool.function.parameters.properties.clone(),
+                required: tool.function.parameters.required.clone(),
+            },
+        }
+    }
+}
+
+impl From<&llm_core::ChatMessage> for AnthropicMessage {
+    fn from(msg: &llm_core::ChatMessage) -> Self {
+        use llm_core::Role;
+
+        let role = match msg.role {
+            Role::User | Role::System => "user",
+            Role::Assistant => "assistant",
+            Role::Tool => "user", // Tool results come as user messages in Anthropic
+        };
+
+        // Handle tool results
+        if msg.role == Role::Tool {
+            if let (Some(tool_call_id), Some(content)) = (&msg.tool_call_id, &msg.content) {
+                return Self {
+                    role: "user".to_string(),
+                    content: AnthropicContent::Blocks(vec![ContentBlock::ToolResult {
+                        tool_use_id: tool_call_id.clone(),
+                        content: content.clone(),
+                        is_error: None,
+                    }]),
+                };
+            }
+        }
+
+        // Handle assistant messages with tool calls
+        if msg.role == Role::Assistant {
+            if let Some(tool_calls) = &msg.tool_calls {
+                let mut blocks: Vec<ContentBlock> = Vec::new();
+
+                // Add text content if present
+                if let Some(text) = &msg.content {
+                    if !text.is_empty() {
+                        blocks.push(ContentBlock::Text { text: text.clone() });
+                    }
+                }
+
+                // Add tool use blocks
+                for call in tool_calls {
+                    blocks.push(ContentBlock::ToolUse {
+                        id: call.id.clone(),
+                        name: call.function.name.clone(),
+                        input: call.function.arguments.clone(),
+                    });
+                }
+
+                return Self {
+                    role: "assistant".to_string(),
+                    content: AnthropicContent::Blocks(blocks),
+                };
+            }
+        }
+
+        // Simple text message
+        Self {
+            role: role.to_string(),
+            content: AnthropicContent::Text(msg.content.clone().unwrap_or_default()),
+        }
+    }
+}

crates/llm/core/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "llm-core"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+description = "LLM provider abstraction layer for Owlen"
+
+[dependencies]
+async-trait = "0.1"
+futures = "0.3"
+rand = "0.8"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+thiserror = "2.0"
+tokio = { version = "1.0", features = ["time"] }
+
+[dev-dependencies]
+tokio = { version = "1.0", features = ["macros", "rt"] }

crates/llm/core/README.md

@@ -0,0 +1,18 @@
+# Owlen LLM Core
+
+The core abstraction layer for Large Language Model (LLM) providers in the Owlen AI agent.
+
+## Overview
+This crate defines the common traits and types used to integrate various AI providers. It enables the agent to be model-agnostic and switch between different backends at runtime.
+
+## Key Components
+- `LlmProvider` Trait: The primary interface that all provider implementations (Anthropic, OpenAI, Ollama) must satisfy.
+- `ChatMessage`: Unified message structure for conversation history.
+- `StreamChunk`: Standardized format for streaming LLM responses.
+- `ToolCall`: Abstraction for tool invocation requests from the model.
+- `TokenCounter`: Utilities for estimating token usage and managing context windows.
+
+## Supported Providers
+- **Anthropic:** Integration with Claude 3.5 models.
+- **OpenAI:** Integration with GPT-4o models.
+- **Ollama:** Support for local models (e.g., Llama 3, Qwen).

crates/llm/core/examples/token_counting.rs

@@ -0,0 +1,195 @@
+//! Token counting example
+//!
+//! This example demonstrates how to use the token counting utilities
+//! to manage LLM context windows.
+//!
+//! Run with: cargo run --example token_counting -p llm-core
+
+use llm_core::{
+    ChatMessage, ClaudeTokenCounter, ContextWindow, SimpleTokenCounter, TokenCounter,
+};
+
+fn main() {
+    println!("=== Token Counting Example ===\n");
+
+    // Example 1: Basic token counting with SimpleTokenCounter
+    println!("1. Basic Token Counting");
+    println!("{}", "-".repeat(50));
+
+    let simple_counter = SimpleTokenCounter::new(8192);
+    let text = "The quick brown fox jumps over the lazy dog.";
+
+    let token_count = simple_counter.count(text);
+    println!("Text: \"{}\"", text);
+    println!("Estimated tokens: {}", token_count);
+    println!("Max context: {}\n", simple_counter.max_context());
+
+    // Example 2: Counting tokens in chat messages
+    println!("2. Counting Tokens in Chat Messages");
+    println!("{}", "-".repeat(50));
+
+    let messages = vec![
+        ChatMessage::system("You are a helpful assistant that provides concise answers."),
+        ChatMessage::user("What is the capital of France?"),
+        ChatMessage::assistant("The capital of France is Paris."),
+        ChatMessage::user("What is its population?"),
+    ];
+
+    let total_tokens = simple_counter.count_messages(&messages);
+    println!("Number of messages: {}", messages.len());
+    println!("Total tokens (with overhead): {}\n", total_tokens);
+
+    // Example 3: Using ClaudeTokenCounter for Claude models
+    println!("3. Claude-Specific Token Counting");
+    println!("{}", "-".repeat(50));
+
+    let claude_counter = ClaudeTokenCounter::new();
+    let claude_total = claude_counter.count_messages(&messages);
+
+    println!("Claude counter max context: {}", claude_counter.max_context());
+    println!("Claude estimated tokens: {}\n", claude_total);
+
+    // Example 4: Context window management
+    println!("4. Context Window Management");
+    println!("{}", "-".repeat(50));
+
+    let mut context = ContextWindow::new(8192);
+    println!("Created context window with max: {} tokens", context.max());
+
+    // Simulate adding messages
+    let conversation = vec![
+        ChatMessage::user("Tell me about Rust programming."),
+        ChatMessage::assistant(
+            "Rust is a systems programming language focused on safety, \
+             speed, and concurrency. It prevents common bugs like null pointer \
+             dereferences and data races through its ownership system.",
+        ),
+        ChatMessage::user("What are its main features?"),
+        ChatMessage::assistant(
+            "Rust's main features include: 1) Memory safety without garbage collection, \
+             2) Zero-cost abstractions, 3) Fearless concurrency, 4) Pattern matching, \
+             5) Type inference, and 6) A powerful macro system.",
+        ),
+    ];
+
+    for (i, msg) in conversation.iter().enumerate() {
+        let tokens = simple_counter.count_messages(&[msg.clone()]);
+        context.add_tokens(tokens);
+
+        let role = msg.role.as_str();
+        let preview = msg
+            .content
+            .as_ref()
+            .map(|c| {
+                if c.len() > 50 {
+                    format!("{}...", &c[..50])
+                } else {
+                    c.clone()
+                }
+            })
+            .unwrap_or_default();
+
+        println!(
+            "Message {}: [{}] \"{}\"",
+            i + 1,
+            role,
+            preview
+        );
+        println!("  Added {} tokens", tokens);
+        println!("  Total used: {} / {}", context.used(), context.max());
+        println!("  Usage: {:.1}%", context.usage_percent() * 100.0);
+        println!("  Progress: {}\n", context.progress_bar(30));
+    }
+
+    // Example 5: Checking context limits
+    println!("5. Checking Context Limits");
+    println!("{}", "-".repeat(50));
+
+    if context.is_near_limit(0.8) {
+        println!("Warning: Context is over 80% full!");
+    } else {
+        println!("Context usage is below 80%");
+    }
+
+    let remaining = context.remaining();
+    println!("Remaining tokens: {}", remaining);
+
+    let new_message_tokens = 500;
+    if context.has_room_for(new_message_tokens) {
+        println!(
+            "Can fit a message of {} tokens",
+            new_message_tokens
+        );
+    } else {
+        println!(
+            "Cannot fit a message of {} tokens - would need to compact or start new context",
+            new_message_tokens
+        );
+    }
+
+    // Example 6: Different counter variants
+    println!("\n6. Using Different Counter Variants");
+    println!("{}", "-".repeat(50));
+
+    let counter_8k = SimpleTokenCounter::default_8k();
+    let counter_32k = SimpleTokenCounter::with_32k();
+    let counter_128k = SimpleTokenCounter::with_128k();
+
+    println!("8k context counter: {} tokens", counter_8k.max_context());
+    println!("32k context counter: {} tokens", counter_32k.max_context());
+    println!("128k context counter: {} tokens", counter_128k.max_context());
+
+    let haiku = ClaudeTokenCounter::haiku();
+    let sonnet = ClaudeTokenCounter::sonnet();
+    let opus = ClaudeTokenCounter::opus();
+
+    println!("\nClaude Haiku: {} tokens", haiku.max_context());
+    println!("Claude Sonnet: {} tokens", sonnet.max_context());
+    println!("Claude Opus: {} tokens", opus.max_context());
+
+    // Example 7: Managing context for a long conversation
+    println!("\n7. Long Conversation Simulation");
+    println!("{}", "-".repeat(50));
+
+    let mut long_context = ContextWindow::new(4096); // Smaller context for demo
+    let counter = SimpleTokenCounter::new(4096);
+
+    let mut message_count = 0;
+    let mut compaction_count = 0;
+
+    // Simulate 20 exchanges
+    for i in 0..20 {
+        let user_msg = ChatMessage::user(format!(
+            "This is user message number {} asking a question.",
+            i + 1
+        ));
+        let assistant_msg = ChatMessage::assistant(format!(
+            "This is assistant response number {} providing a detailed answer with multiple sentences to make it longer.",
+            i + 1
+        ));
+
+        let tokens_needed = counter.count_messages(&[user_msg, assistant_msg]);
+
+        if !long_context.has_room_for(tokens_needed) {
+            println!(
+                "After {} messages, context is full ({}%). Compacting...",
+                message_count,
+                (long_context.usage_percent() * 100.0) as u32
+            );
+            // In a real scenario, we would compact the conversation
+            // For now, just reset
+            long_context.reset();
+            compaction_count += 1;
+        }
+
+        long_context.add_tokens(tokens_needed);
+        message_count += 2;
+    }
+
+    println!("Total messages: {}", message_count);
+    println!("Compactions needed: {}", compaction_count);
+    println!("Final context usage: {:.1}%", long_context.usage_percent() * 100.0);
+    println!("Final progress: {}", long_context.progress_bar(40));
+
+    println!("\n=== Example Complete ===");
+}

crates/llm/core/src/lib.rs

@@ -0,0 +1,864 @@
+//! LLM Provider Abstraction Layer
+//!
+//! This crate defines the common types and traits for LLM provider integration.
+//! Providers (Ollama, Anthropic Claude, OpenAI) implement the `LlmProvider` trait
+//! to enable swapping providers at runtime.
+
+use async_trait::async_trait;
+use futures::Stream;
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use std::pin::Pin;
+use thiserror::Error;
+
+// ============================================================================
+// Public Modules
+// ============================================================================
+
+pub mod retry;
+pub mod tokens;
+
+// Re-export token counting types for convenience
+pub use tokens::{ClaudeTokenCounter, ContextWindow, SimpleTokenCounter, TokenCounter};
+
+// Re-export retry types for convenience
+pub use retry::{is_retryable_error, RetryConfig, RetryStrategy};
+
+// ============================================================================
+// Error Types
+// ============================================================================
+
+#[derive(Error, Debug)]
+pub enum LlmError {
+    #[error("HTTP error: {0}")]
+    Http(String),
+
+    #[error("JSON parsing error: {0}")]
+    Json(String),
+
+    #[error("Authentication error: {0}")]
+    Auth(String),
+
+    #[error("Rate limit exceeded: retry after {retry_after_secs:?} seconds")]
+    RateLimit { retry_after_secs: Option<u64> },
+
+    #[error("API error: {message}")]
+    Api { message: String, code: Option<String> },
+
+    #[error("Provider error: {0}")]
+    Provider(String),
+
+    #[error("Stream error: {0}")]
+    Stream(String),
+
+    #[error("Request timeout: {0}")]
+    Timeout(String),
+}
+
+// ============================================================================
+// Message Types
+// ============================================================================
+
+/// Role of a message in the conversation
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Role {
+    System,
+    User,
+    Assistant,
+    Tool,
+}
+
+impl Role {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Role::System => "system",
+            Role::User => "user",
+            Role::Assistant => "assistant",
+            Role::Tool => "tool",
+        }
+    }
+}
+
+impl From<&str> for Role {
+    fn from(s: &str) -> Self {
+        match s.to_lowercase().as_str() {
+            "system" => Role::System,
+            "user" => Role::User,
+            "assistant" => Role::Assistant,
+            "tool" => Role::Tool,
+            _ => Role::User, // Default fallback
+        }
+    }
+}
+
+/// A message in the conversation
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ChatMessage {
+    pub role: Role,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub content: Option<String>,
+
+    /// Tool calls made by the assistant
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tool_calls: Option<Vec<ToolCall>>,
+
+    /// For tool role messages: the ID of the tool call this responds to
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tool_call_id: Option<String>,
+
+    /// For tool role messages: the name of the tool
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+}
+
+impl ChatMessage {
+    /// Create a system message
+    pub fn system(content: impl Into<String>) -> Self {
+        Self {
+            role: Role::System,
+            content: Some(content.into()),
+            tool_calls: None,
+            tool_call_id: None,
+            name: None,
+        }
+    }
+
+    /// Create a user message
+    pub fn user(content: impl Into<String>) -> Self {
+        Self {
+            role: Role::User,
+            content: Some(content.into()),
+            tool_calls: None,
+            tool_call_id: None,
+            name: None,
+        }
+    }
+
+    /// Create an assistant message
+    pub fn assistant(content: impl Into<String>) -> Self {
+        Self {
+            role: Role::Assistant,
+            content: Some(content.into()),
+            tool_calls: None,
+            tool_call_id: None,
+            name: None,
+        }
+    }
+
+    /// Create an assistant message with tool calls (no text content)
+    pub fn assistant_tool_calls(tool_calls: Vec<ToolCall>) -> Self {
+        Self {
+            role: Role::Assistant,
+            content: None,
+            tool_calls: Some(tool_calls),
+            tool_call_id: None,
+            name: None,
+        }
+    }
+
+    /// Create a tool result message
+    pub fn tool_result(tool_call_id: impl Into<String>, content: impl Into<String>) -> Self {
+        Self {
+            role: Role::Tool,
+            content: Some(content.into()),
+            tool_calls: None,
+            tool_call_id: Some(tool_call_id.into()),
+            name: None,
+        }
+    }
+}
+
+// ============================================================================
+// Tool Types
+// ============================================================================
+
+/// A tool call requested by the LLM
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct ToolCall {
+    /// Unique identifier for this tool call
+    pub id: String,
+
+    /// The type of tool call (always "function" for now)
+    #[serde(rename = "type", default = "default_function_type")]
+    pub call_type: String,
+
+    /// The function being called
+    pub function: FunctionCall,
+}
+
+fn default_function_type() -> String {
+    "function".to_string()
+}
+
+/// Details of a function call
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct FunctionCall {
+    /// Name of the function to call
+    pub name: String,
+
+    /// Arguments as a JSON object
+    pub arguments: Value,
+}
+
+/// Definition of a tool available to the LLM
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Tool {
+    #[serde(rename = "type")]
+    pub tool_type: String,
+
+    pub function: ToolFunction,
+}
+
+impl Tool {
+    /// Create a new function tool
+    pub fn function(
+        name: impl Into<String>,
+        description: impl Into<String>,
+        parameters: ToolParameters,
+    ) -> Self {
+        Self {
+            tool_type: "function".to_string(),
+            function: ToolFunction {
+                name: name.into(),
+                description: description.into(),
+                parameters,
+            },
+        }
+    }
+}
+
+/// Function definition within a tool
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolFunction {
+    pub name: String,
+    pub description: String,
+    pub parameters: ToolParameters,
+}
+
+/// Parameters schema for a function
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolParameters {
+    #[serde(rename = "type")]
+    pub param_type: String,
+
+    /// JSON Schema properties object
+    pub properties: Value,
+
+    /// Required parameter names
+    pub required: Vec<String>,
+}
+
+impl ToolParameters {
+    /// Create an object parameter schema
+    pub fn object(properties: Value, required: Vec<String>) -> Self {
+        Self {
+            param_type: "object".to_string(),
+            properties,
+            required,
+        }
+    }
+}
+
+// ============================================================================
+// Streaming Response Types
+// ============================================================================
+
+/// A chunk of a streaming response
+#[derive(Debug, Clone)]
+pub struct StreamChunk {
+    /// Incremental text content
+    pub content: Option<String>,
+
+    /// Tool calls (may be partial/streaming)
+    pub tool_calls: Option<Vec<ToolCallDelta>>,
+
+    /// Whether this is the final chunk
+    pub done: bool,
+
+    /// Usage statistics (typically only in final chunk)
+    pub usage: Option<Usage>,
+}
+
+/// Partial tool call for streaming
+#[derive(Debug, Clone)]
+pub struct ToolCallDelta {
+    /// Index of this tool call in the array
+    pub index: usize,
+
+    /// Tool call ID (may only be present in first delta)
+    pub id: Option<String>,
+
+    /// Function name (may only be present in first delta)
+    pub function_name: Option<String>,
+
+    /// Incremental arguments string
+    pub arguments_delta: Option<String>,
+}
+
+/// Token usage statistics
+#[derive(Debug, Clone, Default)]
+pub struct Usage {
+    pub prompt_tokens: u32,
+    pub completion_tokens: u32,
+    pub total_tokens: u32,
+}
+
+// ============================================================================
+// Provider Configuration
+// ============================================================================
+
+/// Options for a chat request
+#[derive(Debug, Clone, Default)]
+pub struct ChatOptions {
+    /// Model to use
+    pub model: String,
+
+    /// Temperature (0.0 - 2.0)
+    pub temperature: Option<f32>,
+
+    /// Maximum tokens to generate
+    pub max_tokens: Option<u32>,
+
+    /// Top-p sampling
+    pub top_p: Option<f32>,
+
+    /// Stop sequences
+    pub stop: Option<Vec<String>>,
+}
+
+impl ChatOptions {
+    pub fn new(model: impl Into<String>) -> Self {
+        Self {
+            model: model.into(),
+            ..Default::default()
+        }
+    }
+
+    pub fn with_temperature(mut self, temp: f32) -> Self {
+        self.temperature = Some(temp);
+        self
+    }
+
+    pub fn with_max_tokens(mut self, max: u32) -> Self {
+        self.max_tokens = Some(max);
+        self
+    }
+}
+
+// ============================================================================
+// Provider Trait
+// ============================================================================
+
+/// A boxed stream of chunks
+pub type ChunkStream = Pin<Box<dyn Stream<Item = Result<StreamChunk, LlmError>> + Send>>;
+
+/// The main trait that all LLM providers must implement
+#[async_trait]
+pub trait LlmProvider: Send + Sync {
+    /// Get the provider name (e.g., "ollama", "anthropic", "openai")
+    fn name(&self) -> &str;
+
+    /// Get the current model name
+    fn model(&self) -> &str;
+
+    /// Send a chat request and receive a streaming response
+    ///
+    /// # Arguments
+    /// * `messages` - The conversation history
+    /// * `options` - Request options (model, temperature, etc.)
+    /// * `tools` - Optional list of tools the model can use
+    ///
+    /// # Returns
+    /// A stream of response chunks
+    async fn chat_stream(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChunkStream, LlmError>;
+
+    /// Send a chat request and receive a complete response (non-streaming)
+    ///
+    /// Default implementation collects the stream, but providers may override
+    /// for efficiency.
+    async fn chat(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChatResponse, LlmError> {
+        use futures::StreamExt;
+
+        let mut stream = self.chat_stream(messages, options, tools).await?;
+        let mut content = String::new();
+        let mut tool_calls: Vec<PartialToolCall> = Vec::new();
+        let mut usage = None;
+
+        while let Some(chunk) = stream.next().await {
+            let chunk = chunk?;
+
+            if let Some(text) = chunk.content {
+                content.push_str(&text);
+            }
+
+            if let Some(deltas) = chunk.tool_calls {
+                for delta in deltas {
+                    // Grow the tool_calls vec if needed
+                    while tool_calls.len() <= delta.index {
+                        tool_calls.push(PartialToolCall::default());
+                    }
+
+                    let partial = &mut tool_calls[delta.index];
+                    if let Some(id) = delta.id {
+                        partial.id = Some(id);
+                    }
+                    if let Some(name) = delta.function_name {
+                        partial.function_name = Some(name);
+                    }
+                    if let Some(args) = delta.arguments_delta {
+                        partial.arguments.push_str(&args);
+                    }
+                }
+            }
+
+            if chunk.usage.is_some() {
+                usage = chunk.usage;
+            }
+        }
+
+        // Convert partial tool calls to complete tool calls
+        let final_tool_calls: Vec<ToolCall> = tool_calls
+            .into_iter()
+            .filter_map(|p| p.try_into_tool_call())
+            .collect();
+
+        Ok(ChatResponse {
+            content: if content.is_empty() {
+                None
+            } else {
+                Some(content)
+            },
+            tool_calls: if final_tool_calls.is_empty() {
+                None
+            } else {
+                Some(final_tool_calls)
+            },
+            usage,
+        })
+    }
+}
+
+/// A complete chat response (non-streaming)
+#[derive(Debug, Clone)]
+pub struct ChatResponse {
+    pub content: Option<String>,
+    pub tool_calls: Option<Vec<ToolCall>>,
+    pub usage: Option<Usage>,
+}
+
+// ============================================================================
+// Blanket Implementations
+// ============================================================================
+
+/// Allow `Arc<dyn LlmProvider>` to be used as an `LlmProvider`
+#[async_trait]
+impl LlmProvider for std::sync::Arc<dyn LlmProvider> {
+    fn name(&self) -> &str {
+        (**self).name()
+    }
+
+    fn model(&self) -> &str {
+        (**self).model()
+    }
+
+    async fn chat_stream(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChunkStream, LlmError> {
+        (**self).chat_stream(messages, options, tools).await
+    }
+
+    async fn chat(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChatResponse, LlmError> {
+        (**self).chat(messages, options, tools).await
+    }
+}
+
+/// Allow `&Arc<dyn LlmProvider>` to be used as an `LlmProvider`
+#[async_trait]
+impl LlmProvider for &std::sync::Arc<dyn LlmProvider> {
+    fn name(&self) -> &str {
+        (***self).name()
+    }
+
+    fn model(&self) -> &str {
+        (***self).model()
+    }
+
+    async fn chat_stream(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChunkStream, LlmError> {
+        (***self).chat_stream(messages, options, tools).await
+    }
+
+    async fn chat(
+        &self,
+        messages: &[ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<ChatResponse, LlmError> {
+        (***self).chat(messages, options, tools).await
+    }
+}
+
+/// Helper for accumulating streaming tool calls
+#[derive(Default)]
+struct PartialToolCall {
+    id: Option<String>,
+    function_name: Option<String>,
+    arguments: String,
+}
+
+impl PartialToolCall {
+    fn try_into_tool_call(self) -> Option<ToolCall> {
+        let id = self.id?;
+        let name = self.function_name?;
+        let arguments: Value = serde_json::from_str(&self.arguments).ok()?;
+
+        Some(ToolCall {
+            id,
+            call_type: "function".to_string(),
+            function: FunctionCall { name, arguments },
+        })
+    }
+}
+
+// ============================================================================
+// Authentication
+// ============================================================================
+
+/// Authentication method for LLM providers
+#[derive(Debug, Clone)]
+pub enum AuthMethod {
+    /// No authentication (for local providers like Ollama)
+    None,
+
+    /// API key authentication
+    ApiKey(String),
+
+    /// OAuth access token (from login flow)
+    OAuth {
+        access_token: String,
+        refresh_token: Option<String>,
+        expires_at: Option<u64>,
+    },
+}
+
+impl AuthMethod {
+    /// Create API key auth
+    pub fn api_key(key: impl Into<String>) -> Self {
+        Self::ApiKey(key.into())
+    }
+
+    /// Create OAuth auth from tokens
+    pub fn oauth(access_token: impl Into<String>) -> Self {
+        Self::OAuth {
+            access_token: access_token.into(),
+            refresh_token: None,
+            expires_at: None,
+        }
+    }
+
+    /// Create OAuth auth with refresh token
+    pub fn oauth_with_refresh(
+        access_token: impl Into<String>,
+        refresh_token: impl Into<String>,
+        expires_at: Option<u64>,
+    ) -> Self {
+        Self::OAuth {
+            access_token: access_token.into(),
+            refresh_token: Some(refresh_token.into()),
+            expires_at,
+        }
+    }
+
+    /// Get the bearer token for Authorization header
+    pub fn bearer_token(&self) -> Option<&str> {
+        match self {
+            Self::None => None,
+            Self::ApiKey(key) => Some(key),
+            Self::OAuth { access_token, .. } => Some(access_token),
+        }
+    }
+
+    /// Check if token might need refresh
+    pub fn needs_refresh(&self) -> bool {
+        match self {
+            Self::OAuth {
+                expires_at: Some(exp),
+                refresh_token: Some(_),
+                ..
+            } => {
+                let now = std::time::SystemTime::now()
+                    .duration_since(std::time::UNIX_EPOCH)
+                    .map(|d| d.as_secs())
+                    .unwrap_or(0);
+                // Refresh if expiring within 5 minutes
+                *exp < now + 300
+            }
+            _ => false,
+        }
+    }
+}
+
+/// Device code response for OAuth device flow
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DeviceCodeResponse {
+    /// Code the user enters on the verification page
+    pub user_code: String,
+
+    /// URL the user visits to authorize
+    pub verification_uri: String,
+
+    /// Full URL with code pre-filled (if supported)
+    pub verification_uri_complete: Option<String>,
+
+    /// Device code for polling (internal use)
+    pub device_code: String,
+
+    /// How often to poll (in seconds)
+    pub interval: u64,
+
+    /// When the codes expire (in seconds)
+    pub expires_in: u64,
+}
+
+/// Result of polling for device authorization
+#[derive(Debug, Clone)]
+pub enum DeviceAuthResult {
+    /// Still waiting for user to authorize
+    Pending,
+
+    /// User authorized, here are the tokens
+    Success {
+        access_token: String,
+        refresh_token: Option<String>,
+        expires_in: Option<u64>,
+    },
+
+    /// User denied authorization
+    Denied,
+
+    /// Code expired
+    Expired,
+}
+
+/// Trait for providers that support OAuth device flow
+#[async_trait]
+pub trait OAuthProvider {
+    /// Start the device authorization flow
+    async fn start_device_auth(&self) -> Result<DeviceCodeResponse, LlmError>;
+
+    /// Poll for the authorization result
+    async fn poll_device_auth(&self, device_code: &str) -> Result<DeviceAuthResult, LlmError>;
+
+    /// Refresh an access token using a refresh token
+    async fn refresh_token(&self, refresh_token: &str) -> Result<AuthMethod, LlmError>;
+}
+
+/// Stored credentials for a provider
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StoredCredentials {
+    pub provider: String,
+    pub access_token: String,
+    pub refresh_token: Option<String>,
+    pub expires_at: Option<u64>,
+}
+
+// ============================================================================
+// Provider Status & Info
+// ============================================================================
+
+/// Status information for a provider connection
+#[derive(Debug, Clone)]
+pub struct ProviderStatus {
+    /// Provider name
+    pub provider: String,
+
+    /// Whether the connection is authenticated
+    pub authenticated: bool,
+
+    /// Current user/account info if authenticated
+    pub account: Option<AccountInfo>,
+
+    /// Current model being used
+    pub model: String,
+
+    /// API endpoint URL
+    pub endpoint: String,
+
+    /// Whether the provider is reachable
+    pub reachable: bool,
+
+    /// Any status message or error
+    pub message: Option<String>,
+}
+
+/// Account/user information from the provider
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AccountInfo {
+    /// Account/user ID
+    pub id: Option<String>,
+
+    /// Display name or email
+    pub name: Option<String>,
+
+    /// Account email
+    pub email: Option<String>,
+
+    /// Account type (free, pro, team, enterprise)
+    pub account_type: Option<String>,
+
+    /// Organization name if applicable
+    pub organization: Option<String>,
+}
+
+/// Usage statistics from the provider
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct UsageStats {
+    /// Total tokens used in current period
+    pub tokens_used: Option<u64>,
+
+    /// Token limit for current period (if applicable)
+    pub token_limit: Option<u64>,
+
+    /// Number of requests made
+    pub requests_made: Option<u64>,
+
+    /// Request limit (if applicable)
+    pub request_limit: Option<u64>,
+
+    /// Cost incurred (if available)
+    pub cost_usd: Option<f64>,
+
+    /// Period start timestamp
+    pub period_start: Option<u64>,
+
+    /// Period end timestamp
+    pub period_end: Option<u64>,
+}
+
+/// Available model information
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ModelInfo {
+    /// Model ID/name
+    pub id: String,
+
+    /// Human-readable display name
+    pub display_name: Option<String>,
+
+    /// Model description
+    pub description: Option<String>,
+
+    /// Context window size (tokens)
+    pub context_window: Option<u32>,
+
+    /// Max output tokens
+    pub max_output_tokens: Option<u32>,
+
+    /// Whether the model supports tool use
+    pub supports_tools: bool,
+
+    /// Whether the model supports vision/images
+    pub supports_vision: bool,
+
+    /// Input token price per 1M tokens (USD)
+    pub input_price_per_mtok: Option<f64>,
+
+    /// Output token price per 1M tokens (USD)
+    pub output_price_per_mtok: Option<f64>,
+}
+
+/// Trait for providers that support status/info queries
+#[async_trait]
+pub trait ProviderInfo {
+    /// Get the current connection status
+    async fn status(&self) -> Result<ProviderStatus, LlmError>;
+
+    /// Get account information (if authenticated)
+    async fn account_info(&self) -> Result<Option<AccountInfo>, LlmError>;
+
+    /// Get usage statistics (if available)
+    async fn usage_stats(&self) -> Result<Option<UsageStats>, LlmError>;
+
+    /// List available models
+    async fn list_models(&self) -> Result<Vec<ModelInfo>, LlmError>;
+
+    /// Check if a specific model is available
+    async fn model_info(&self, model_id: &str) -> Result<Option<ModelInfo>, LlmError> {
+        let models = self.list_models().await?;
+        Ok(models.into_iter().find(|m| m.id == model_id))
+    }
+}
+
+// ============================================================================
+// Provider Factory
+// ============================================================================
+
+/// Supported LLM providers
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum ProviderType {
+    Ollama,
+    Anthropic,
+    OpenAI,
+}
+
+impl std::str::FromStr for ProviderType {
+    type Err = ();
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s.to_lowercase().as_str() {
+            "ollama" => Ok(Self::Ollama),
+            "anthropic" | "claude" => Ok(Self::Anthropic),
+            "openai" | "gpt" => Ok(Self::OpenAI),
+            _ => Err(()),
+        }
+    }
+}
+
+impl ProviderType {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Ollama => "ollama",
+            Self::Anthropic => "anthropic",
+            Self::OpenAI => "openai",
+        }
+    }
+
+    /// Default model for this provider
+    pub fn default_model(&self) -> &'static str {
+        match self {
+            Self::Ollama => "qwen3:8b",
+            Self::Anthropic => "claude-sonnet-4-20250514",
+            Self::OpenAI => "gpt-4o",
+        }
+    }
+}
+
+impl std::fmt::Display for ProviderType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}

crates/llm/core/src/retry.rs

@@ -0,0 +1,386 @@
+//! Error recovery and retry logic for LLM operations
+//!
+//! This module provides configurable retry strategies with exponential backoff
+//! for handling transient failures when communicating with LLM providers.
+
+use crate::LlmError;
+use rand::Rng;
+use std::time::Duration;
+
+/// Configuration for retry behavior
+#[derive(Debug, Clone)]
+pub struct RetryConfig {
+    /// Maximum number of retry attempts
+    pub max_retries: u32,
+    /// Initial delay before first retry (in milliseconds)
+    pub initial_delay_ms: u64,
+    /// Maximum delay between retries (in milliseconds)
+    pub max_delay_ms: u64,
+    /// Multiplier for exponential backoff
+    pub backoff_multiplier: f32,
+}
+
+impl Default for RetryConfig {
+    fn default() -> Self {
+        Self {
+            max_retries: 3,
+            initial_delay_ms: 1000,
+            max_delay_ms: 30000,
+            backoff_multiplier: 2.0,
+        }
+    }
+}
+
+impl RetryConfig {
+    /// Create a new retry configuration with custom values
+    pub fn new(
+        max_retries: u32,
+        initial_delay_ms: u64,
+        max_delay_ms: u64,
+        backoff_multiplier: f32,
+    ) -> Self {
+        Self {
+            max_retries,
+            initial_delay_ms,
+            max_delay_ms,
+            backoff_multiplier,
+        }
+    }
+
+    /// Create a configuration with no retries
+    pub fn no_retry() -> Self {
+        Self {
+            max_retries: 0,
+            initial_delay_ms: 0,
+            max_delay_ms: 0,
+            backoff_multiplier: 1.0,
+        }
+    }
+
+    /// Create a configuration with aggressive retries for rate-limited scenarios
+    pub fn aggressive() -> Self {
+        Self {
+            max_retries: 5,
+            initial_delay_ms: 2000,
+            max_delay_ms: 60000,
+            backoff_multiplier: 2.5,
+        }
+    }
+}
+
+/// Determines whether an error is retryable
+///
+/// # Arguments
+/// * `error` - The error to check
+///
+/// # Returns
+/// `true` if the error is transient and the operation should be retried,
+/// `false` if the error is permanent and retrying won't help
+pub fn is_retryable_error(error: &LlmError) -> bool {
+    match error {
+        // Always retry rate limits
+        LlmError::RateLimit { .. } => true,
+
+        // Always retry timeouts
+        LlmError::Timeout(_) => true,
+
+        // Retry HTTP errors that are server-side (5xx)
+        LlmError::Http(msg) => {
+            // Check if the error message contains a 5xx status code
+            msg.contains("500")
+                || msg.contains("502")
+                || msg.contains("503")
+                || msg.contains("504")
+                || msg.contains("Internal Server Error")
+                || msg.contains("Bad Gateway")
+                || msg.contains("Service Unavailable")
+                || msg.contains("Gateway Timeout")
+        }
+
+        // Don't retry authentication errors - they need user intervention
+        LlmError::Auth(_) => false,
+
+        // Don't retry JSON parsing errors - the data is malformed
+        LlmError::Json(_) => false,
+
+        // Don't retry API errors - these are typically client-side issues
+        LlmError::Api { .. } => false,
+
+        // Provider errors might be transient, but we conservatively don't retry
+        LlmError::Provider(_) => false,
+
+        // Stream errors are typically not retryable
+        LlmError::Stream(_) => false,
+    }
+}
+
+/// Strategy for retrying failed operations with exponential backoff
+#[derive(Debug, Clone)]
+pub struct RetryStrategy {
+    config: RetryConfig,
+}
+
+impl RetryStrategy {
+    /// Create a new retry strategy with the given configuration
+    pub fn new(config: RetryConfig) -> Self {
+        Self { config }
+    }
+
+    /// Create a retry strategy with default configuration
+    pub fn default_config() -> Self {
+        Self::new(RetryConfig::default())
+    }
+
+    /// Execute an async operation with retries
+    ///
+    /// # Arguments
+    /// * `operation` - A function that returns a Future producing a Result
+    ///
+    /// # Returns
+    /// The result of the operation, or the last error if all retries fail
+    ///
+    /// # Example
+    /// ```ignore
+    /// let strategy = RetryStrategy::default_config();
+    /// let result = strategy.execute(|| async {
+    ///     // Your LLM API call here
+    ///     llm_client.chat(&messages, &options, None).await
+    /// }).await?;
+    /// ```
+    pub async fn execute<F, T, Fut>(&self, operation: F) -> Result<T, LlmError>
+    where
+        F: Fn() -> Fut,
+        Fut: std::future::Future<Output = Result<T, LlmError>>,
+    {
+        let mut attempt = 0;
+
+        loop {
+            // Try the operation
+            match operation().await {
+                Ok(result) => return Ok(result),
+                Err(err) => {
+                    // Check if we should retry
+                    if !is_retryable_error(&err) {
+                        return Err(err);
+                    }
+
+                    attempt += 1;
+
+                    // Check if we've exhausted retries
+                    if attempt > self.config.max_retries {
+                        return Err(err);
+                    }
+
+                    // Calculate delay with exponential backoff and jitter
+                    let delay = self.delay_for_attempt(attempt);
+
+                    // Log retry attempt (in a real implementation, you might use tracing)
+                    eprintln!(
+                        "Retry attempt {}/{} after {:?}",
+                        attempt, self.config.max_retries, delay
+                    );
+
+                    // Sleep before next attempt
+                    tokio::time::sleep(delay).await;
+                }
+            }
+        }
+    }
+
+    /// Calculate the delay for a given attempt number with jitter
+    ///
+    /// Uses exponential backoff: delay = initial_delay * (backoff_multiplier ^ (attempt - 1))
+    /// Adds random jitter of ±10% to prevent thundering herd problems
+    ///
+    /// # Arguments
+    /// * `attempt` - The attempt number (1-indexed)
+    ///
+    /// # Returns
+    /// The delay duration to wait before the next retry
+    fn delay_for_attempt(&self, attempt: u32) -> Duration {
+        // Calculate base delay with exponential backoff
+        let base_delay_ms = self.config.initial_delay_ms as f64
+            * self.config.backoff_multiplier.powi((attempt - 1) as i32) as f64;
+
+        // Cap at max_delay_ms
+        let capped_delay_ms = base_delay_ms.min(self.config.max_delay_ms as f64);
+
+        // Add jitter: ±10%
+        let mut rng = rand::thread_rng();
+        let jitter_factor = rng.gen_range(0.9..=1.1);
+        let final_delay_ms = capped_delay_ms * jitter_factor;
+
+        Duration::from_millis(final_delay_ms as u64)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::sync::atomic::{AtomicU32, Ordering};
+    use std::sync::Arc;
+
+    #[test]
+    fn test_default_retry_config() {
+        let config = RetryConfig::default();
+        assert_eq!(config.max_retries, 3);
+        assert_eq!(config.initial_delay_ms, 1000);
+        assert_eq!(config.max_delay_ms, 30000);
+        assert_eq!(config.backoff_multiplier, 2.0);
+    }
+
+    #[test]
+    fn test_no_retry_config() {
+        let config = RetryConfig::no_retry();
+        assert_eq!(config.max_retries, 0);
+    }
+
+    #[test]
+    fn test_is_retryable_error() {
+        // Retryable errors
+        assert!(is_retryable_error(&LlmError::RateLimit {
+            retry_after_secs: Some(60)
+        }));
+        assert!(is_retryable_error(&LlmError::Timeout(
+            "Request timed out".to_string()
+        )));
+        assert!(is_retryable_error(&LlmError::Http(
+            "500 Internal Server Error".to_string()
+        )));
+        assert!(is_retryable_error(&LlmError::Http(
+            "503 Service Unavailable".to_string()
+        )));
+
+        // Non-retryable errors
+        assert!(!is_retryable_error(&LlmError::Auth(
+            "Invalid API key".to_string()
+        )));
+        assert!(!is_retryable_error(&LlmError::Json(
+            "Invalid JSON".to_string()
+        )));
+        assert!(!is_retryable_error(&LlmError::Api {
+            message: "Invalid request".to_string(),
+            code: Some("400".to_string())
+        }));
+        assert!(!is_retryable_error(&LlmError::Http(
+            "400 Bad Request".to_string()
+        )));
+    }
+
+    #[test]
+    fn test_delay_calculation() {
+        let config = RetryConfig::default();
+        let strategy = RetryStrategy::new(config);
+
+        // Test that delays increase exponentially
+        let delay1 = strategy.delay_for_attempt(1);
+        let delay2 = strategy.delay_for_attempt(2);
+        let delay3 = strategy.delay_for_attempt(3);
+
+        // Base delays should be around 1000ms, 2000ms, 4000ms (with jitter)
+        assert!(delay1.as_millis() >= 900 && delay1.as_millis() <= 1100);
+        assert!(delay2.as_millis() >= 1800 && delay2.as_millis() <= 2200);
+        assert!(delay3.as_millis() >= 3600 && delay3.as_millis() <= 4400);
+    }
+
+    #[test]
+    fn test_delay_max_cap() {
+        let config = RetryConfig {
+            max_retries: 10,
+            initial_delay_ms: 1000,
+            max_delay_ms: 5000,
+            backoff_multiplier: 2.0,
+        };
+        let strategy = RetryStrategy::new(config);
+
+        // Even with high attempt numbers, delay should be capped
+        let delay = strategy.delay_for_attempt(10);
+        assert!(delay.as_millis() <= 5500); // max + jitter
+    }
+
+    #[tokio::test]
+    async fn test_retry_success_on_first_attempt() {
+        let strategy = RetryStrategy::default_config();
+        let call_count = Arc::new(AtomicU32::new(0));
+        let count_clone = call_count.clone();
+
+        let result = strategy
+            .execute(|| {
+                let count = count_clone.clone();
+                async move {
+                    count.fetch_add(1, Ordering::SeqCst);
+                    Ok::<_, LlmError>(42)
+                }
+            })
+            .await;
+
+        assert_eq!(result.unwrap(), 42);
+        assert_eq!(call_count.load(Ordering::SeqCst), 1);
+    }
+
+    #[tokio::test]
+    async fn test_retry_success_after_retries() {
+        let config = RetryConfig::new(3, 10, 100, 2.0); // Fast retries for testing
+        let strategy = RetryStrategy::new(config);
+        let call_count = Arc::new(AtomicU32::new(0));
+        let count_clone = call_count.clone();
+
+        let result = strategy
+            .execute(|| {
+                let count = count_clone.clone();
+                async move {
+                    let current = count.fetch_add(1, Ordering::SeqCst) + 1;
+                    if current < 3 {
+                        Err(LlmError::Timeout("Timeout".to_string()))
+                    } else {
+                        Ok(42)
+                    }
+                }
+            })
+            .await;
+
+        assert_eq!(result.unwrap(), 42);
+        assert_eq!(call_count.load(Ordering::SeqCst), 3);
+    }
+
+    #[tokio::test]
+    async fn test_retry_exhausted() {
+        let config = RetryConfig::new(2, 10, 100, 2.0); // Fast retries for testing
+        let strategy = RetryStrategy::new(config);
+        let call_count = Arc::new(AtomicU32::new(0));
+        let count_clone = call_count.clone();
+
+        let result = strategy
+            .execute(|| {
+                let count = count_clone.clone();
+                async move {
+                    count.fetch_add(1, Ordering::SeqCst);
+                    Err::<(), _>(LlmError::Timeout("Always fails".to_string()))
+                }
+            })
+            .await;
+
+        assert!(result.is_err());
+        assert_eq!(call_count.load(Ordering::SeqCst), 3); // Initial attempt + 2 retries
+    }
+
+    #[tokio::test]
+    async fn test_non_retryable_error() {
+        let strategy = RetryStrategy::default_config();
+        let call_count = Arc::new(AtomicU32::new(0));
+        let count_clone = call_count.clone();
+
+        let result = strategy
+            .execute(|| {
+                let count = count_clone.clone();
+                async move {
+                    count.fetch_add(1, Ordering::SeqCst);
+                    Err::<(), _>(LlmError::Auth("Invalid API key".to_string()))
+                }
+            })
+            .await;
+
+        assert!(result.is_err());
+        assert_eq!(call_count.load(Ordering::SeqCst), 1); // Should not retry
+    }
+}

crates/llm/core/src/tokens.rs

@@ -0,0 +1,607 @@
+//! Token counting utilities for LLM context management
+//!
+//! This module provides token counting abstractions and implementations for
+//! managing LLM context windows. Token counters estimate token usage without
+//! requiring external tokenization libraries, using heuristic-based approaches.
+
+use crate::ChatMessage;
+
+// ============================================================================
+// TokenCounter Trait
+// ============================================================================
+
+/// Trait for counting tokens in text and chat messages
+///
+/// Implementations provide model-specific token counting logic to help
+/// manage context windows and estimate API costs.
+pub trait TokenCounter: Send + Sync {
+    /// Count tokens in a string
+    ///
+    /// # Arguments
+    /// * `text` - The text to count tokens for
+    ///
+    /// # Returns
+    /// Estimated number of tokens
+    fn count(&self, text: &str) -> usize;
+
+    /// Count tokens in chat messages
+    ///
+    /// This accounts for both the message content and the overhead
+    /// from the chat message structure (roles, delimiters, etc.).
+    ///
+    /// # Arguments
+    /// * `messages` - The messages to count tokens for
+    ///
+    /// # Returns
+    /// Estimated total tokens including message structure overhead
+    fn count_messages(&self, messages: &[ChatMessage]) -> usize;
+
+    /// Get the model's max context window size
+    ///
+    /// # Returns
+    /// Maximum number of tokens the model can handle
+    fn max_context(&self) -> usize;
+}
+
+// ============================================================================
+// SimpleTokenCounter
+// ============================================================================
+
+/// A basic token counter using simple heuristics
+///
+/// This counter uses the rule of thumb that English text averages about
+/// 4 characters per token. It adds overhead for message structure.
+///
+/// # Example
+/// ```
+/// use llm_core::tokens::{TokenCounter, SimpleTokenCounter};
+/// use llm_core::ChatMessage;
+///
+/// let counter = SimpleTokenCounter::new(8192);
+/// let text = "Hello, world!";
+/// let tokens = counter.count(text);
+/// assert!(tokens > 0);
+///
+/// let messages = vec![
+///     ChatMessage::user("What is the weather?"),
+///     ChatMessage::assistant("I don't have access to weather data."),
+/// ];
+/// let total = counter.count_messages(&messages);
+/// assert!(total > 0);
+/// ```
+#[derive(Debug, Clone)]
+pub struct SimpleTokenCounter {
+    max_context: usize,
+}
+
+impl SimpleTokenCounter {
+    /// Create a new simple token counter
+    ///
+    /// # Arguments
+    /// * `max_context` - Maximum context window size for the model
+    pub fn new(max_context: usize) -> Self {
+        Self { max_context }
+    }
+
+    /// Create a token counter with a default 8192 token context
+    pub fn default_8k() -> Self {
+        Self::new(8192)
+    }
+
+    /// Create a token counter with a 32k token context
+    pub fn with_32k() -> Self {
+        Self::new(32768)
+    }
+
+    /// Create a token counter with a 128k token context
+    pub fn with_128k() -> Self {
+        Self::new(131072)
+    }
+}
+
+impl TokenCounter for SimpleTokenCounter {
+    fn count(&self, text: &str) -> usize {
+        // Estimate: approximately 4 characters per token for English
+        // Add 3 before dividing to round up
+        text.len().div_ceil(4)
+    }
+
+    fn count_messages(&self, messages: &[ChatMessage]) -> usize {
+        let mut total = 0;
+
+        // Base overhead for message formatting (estimated)
+        // Each message has role, delimiters, etc.
+        const MESSAGE_OVERHEAD: usize = 4;
+
+        for msg in messages {
+            // Count role
+            total += MESSAGE_OVERHEAD;
+
+            // Count content
+            if let Some(content) = &msg.content {
+                total += self.count(content);
+            }
+
+            // Count tool calls (more expensive due to JSON structure)
+            if let Some(tool_calls) = &msg.tool_calls {
+                for tc in tool_calls {
+                    // ID overhead
+                    total += self.count(&tc.id);
+                    // Function name
+                    total += self.count(&tc.function.name);
+                    // Arguments (JSON serialized, add 20% overhead for JSON structure)
+                    let args_str = tc.function.arguments.to_string();
+                    total += (self.count(&args_str) * 12) / 10;
+                }
+            }
+
+            // Count tool call id for tool result messages
+            if let Some(tool_call_id) = &msg.tool_call_id {
+                total += self.count(tool_call_id);
+            }
+
+            // Count tool name for tool result messages
+            if let Some(name) = &msg.name {
+                total += self.count(name);
+            }
+        }
+
+        total
+    }
+
+    fn max_context(&self) -> usize {
+        self.max_context
+    }
+}
+
+// ============================================================================
+// ClaudeTokenCounter
+// ============================================================================
+
+/// Token counter optimized for Anthropic Claude models
+///
+/// Claude models have specific tokenization characteristics and overhead.
+/// This counter adjusts the estimates accordingly.
+///
+/// # Example
+/// ```
+/// use llm_core::tokens::{TokenCounter, ClaudeTokenCounter};
+/// use llm_core::ChatMessage;
+///
+/// let counter = ClaudeTokenCounter::new();
+/// let messages = vec![
+///     ChatMessage::system("You are a helpful assistant."),
+///     ChatMessage::user("Hello!"),
+/// ];
+/// let total = counter.count_messages(&messages);
+/// ```
+#[derive(Debug, Clone)]
+pub struct ClaudeTokenCounter {
+    max_context: usize,
+}
+
+impl ClaudeTokenCounter {
+    /// Create a new Claude token counter with default 200k context
+    ///
+    /// This is suitable for Claude 3.5 Sonnet, Claude 4 Sonnet, and Claude 4 Opus.
+    pub fn new() -> Self {
+        Self {
+            max_context: 200_000,
+        }
+    }
+
+    /// Create a Claude counter with a custom context window
+    ///
+    /// # Arguments
+    /// * `max_context` - Maximum context window size
+    pub fn with_context(max_context: usize) -> Self {
+        Self { max_context }
+    }
+
+    /// Create a counter for Claude 3 Haiku (200k context)
+    pub fn haiku() -> Self {
+        Self::new()
+    }
+
+    /// Create a counter for Claude 3.5 Sonnet (200k context)
+    pub fn sonnet() -> Self {
+        Self::new()
+    }
+
+    /// Create a counter for Claude 4 Opus (200k context)
+    pub fn opus() -> Self {
+        Self::new()
+    }
+}
+
+impl Default for ClaudeTokenCounter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl TokenCounter for ClaudeTokenCounter {
+    fn count(&self, text: &str) -> usize {
+        // Claude's tokenization is similar to the 4 chars/token heuristic
+        // but tends to be slightly more efficient with structured content
+        text.len().div_ceil(4)
+    }
+
+    fn count_messages(&self, messages: &[ChatMessage]) -> usize {
+        let mut total = 0;
+
+        // Claude has specific message formatting overhead
+        const MESSAGE_OVERHEAD: usize = 5;
+        const SYSTEM_MESSAGE_OVERHEAD: usize = 3;
+
+        for msg in messages {
+            // Different overhead for system vs other messages
+            let overhead = if matches!(msg.role, crate::Role::System) {
+                SYSTEM_MESSAGE_OVERHEAD
+            } else {
+                MESSAGE_OVERHEAD
+            };
+
+            total += overhead;
+
+            // Count content
+            if let Some(content) = &msg.content {
+                total += self.count(content);
+            }
+
+            // Count tool calls
+            if let Some(tool_calls) = &msg.tool_calls {
+                // Claude's tool call format has additional overhead
+                const TOOL_CALL_OVERHEAD: usize = 10;
+
+                for tc in tool_calls {
+                    total += TOOL_CALL_OVERHEAD;
+                    total += self.count(&tc.id);
+                    total += self.count(&tc.function.name);
+
+                    // Arguments with JSON structure overhead
+                    let args_str = tc.function.arguments.to_string();
+                    total += (self.count(&args_str) * 12) / 10;
+                }
+            }
+
+            // Tool result overhead
+            if msg.tool_call_id.is_some() {
+                const TOOL_RESULT_OVERHEAD: usize = 8;
+                total += TOOL_RESULT_OVERHEAD;
+
+                if let Some(tool_call_id) = &msg.tool_call_id {
+                    total += self.count(tool_call_id);
+                }
+
+                if let Some(name) = &msg.name {
+                    total += self.count(name);
+                }
+            }
+        }
+
+        total
+    }
+
+    fn max_context(&self) -> usize {
+        self.max_context
+    }
+}
+
+// ============================================================================
+// ContextWindow
+// ============================================================================
+
+/// Manages context window tracking for a conversation
+///
+/// Helps monitor token usage and determine when context limits are approaching.
+///
+/// # Example
+/// ```
+/// use llm_core::tokens::{ContextWindow, TokenCounter, SimpleTokenCounter};
+/// use llm_core::ChatMessage;
+///
+/// let counter = SimpleTokenCounter::new(8192);
+/// let mut window = ContextWindow::new(counter.max_context());
+///
+/// let messages = vec![
+///     ChatMessage::user("Hello!"),
+///     ChatMessage::assistant("Hi there!"),
+/// ];
+///
+/// let tokens = counter.count_messages(&messages);
+/// window.add_tokens(tokens);
+///
+/// println!("Used: {} tokens", window.used());
+/// println!("Remaining: {} tokens", window.remaining());
+/// println!("Usage: {:.1}%", window.usage_percent() * 100.0);
+///
+/// if window.is_near_limit(0.8) {
+///     println!("Warning: Context is 80% full!");
+/// }
+/// ```
+#[derive(Debug, Clone)]
+pub struct ContextWindow {
+    /// Number of tokens currently used
+    used: usize,
+    /// Maximum number of tokens allowed
+    max: usize,
+}
+
+impl ContextWindow {
+    /// Create a new context window tracker
+    ///
+    /// # Arguments
+    /// * `max` - Maximum context window size in tokens
+    pub fn new(max: usize) -> Self {
+        Self { used: 0, max }
+    }
+
+    /// Create a context window with initial usage
+    ///
+    /// # Arguments
+    /// * `max` - Maximum context window size
+    /// * `used` - Initial number of tokens used
+    pub fn with_usage(max: usize, used: usize) -> Self {
+        Self { used, max }
+    }
+
+    /// Get the number of tokens currently used
+    pub fn used(&self) -> usize {
+        self.used
+    }
+
+    /// Get the maximum number of tokens
+    pub fn max(&self) -> usize {
+        self.max
+    }
+
+    /// Get the number of remaining tokens
+    pub fn remaining(&self) -> usize {
+        self.max.saturating_sub(self.used)
+    }
+
+    /// Get the usage as a percentage (0.0 to 1.0)
+    ///
+    /// Returns the fraction of the context window that is currently used.
+    pub fn usage_percent(&self) -> f32 {
+        if self.max == 0 {
+            return 0.0;
+        }
+        self.used as f32 / self.max as f32
+    }
+
+    /// Check if usage is near the limit
+    ///
+    /// # Arguments
+    /// * `threshold` - Threshold as a fraction (0.0 to 1.0). For example,
+    ///   0.8 means "is usage > 80%?"
+    ///
+    /// # Returns
+    /// `true` if the current usage exceeds the threshold percentage
+    pub fn is_near_limit(&self, threshold: f32) -> bool {
+        self.usage_percent() > threshold
+    }
+
+    /// Add tokens to the usage count
+    ///
+    /// # Arguments
+    /// * `tokens` - Number of tokens to add
+    pub fn add_tokens(&mut self, tokens: usize) {
+        self.used = self.used.saturating_add(tokens);
+    }
+
+    /// Set the current usage
+    ///
+    /// # Arguments
+    /// * `used` - Number of tokens currently used
+    pub fn set_used(&mut self, used: usize) {
+        self.used = used;
+    }
+
+    /// Reset the usage counter to zero
+    pub fn reset(&mut self) {
+        self.used = 0;
+    }
+
+    /// Check if there's enough room for additional tokens
+    ///
+    /// # Arguments
+    /// * `tokens` - Number of tokens needed
+    ///
+    /// # Returns
+    /// `true` if adding these tokens would stay within the limit
+    pub fn has_room_for(&self, tokens: usize) -> bool {
+        self.used.saturating_add(tokens) <= self.max
+    }
+
+    /// Get a visual progress bar representation
+    ///
+    /// # Arguments
+    /// * `width` - Width of the progress bar in characters
+    ///
+    /// # Returns
+    /// A string with a simple text-based progress bar
+    pub fn progress_bar(&self, width: usize) -> String {
+        if width == 0 {
+            return String::new();
+        }
+
+        let percent = self.usage_percent();
+        let filled = ((percent * width as f32) as usize).min(width);
+        let empty = width - filled;
+
+        format!(
+            "[{}{}] {:.1}%",
+            "=".repeat(filled),
+            " ".repeat(empty),
+            percent * 100.0
+        )
+    }
+}
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{ChatMessage, FunctionCall, ToolCall};
+    use serde_json::json;
+
+    #[test]
+    fn test_simple_counter_basic() {
+        let counter = SimpleTokenCounter::new(8192);
+
+        // Empty string
+        assert_eq!(counter.count(""), 0);
+
+        // Short string (~4 chars/token)
+        let text = "Hello, world!"; // 13 chars -> ~4 tokens
+        let count = counter.count(text);
+        assert!(count >= 3 && count <= 5);
+
+        // Longer text
+        let text = "The quick brown fox jumps over the lazy dog"; // 44 chars -> ~11 tokens
+        let count = counter.count(text);
+        assert!(count >= 10 && count <= 13);
+    }
+
+    #[test]
+    fn test_simple_counter_messages() {
+        let counter = SimpleTokenCounter::new(8192);
+
+        let messages = vec![
+            ChatMessage::user("Hello!"),
+            ChatMessage::assistant("Hi there! How can I help you today?"),
+        ];
+
+        let total = counter.count_messages(&messages);
+
+        // Should be more than just the text due to overhead
+        let text_only = counter.count("Hello!") + counter.count("Hi there! How can I help you today?");
+        assert!(total > text_only);
+    }
+
+    #[test]
+    fn test_simple_counter_with_tool_calls() {
+        let counter = SimpleTokenCounter::new(8192);
+
+        let tool_call = ToolCall {
+            id: "call_123".to_string(),
+            call_type: "function".to_string(),
+            function: FunctionCall {
+                name: "read_file".to_string(),
+                arguments: json!({"path": "/etc/hosts"}),
+            },
+        };
+
+        let messages = vec![ChatMessage::assistant_tool_calls(vec![tool_call])];
+
+        let total = counter.count_messages(&messages);
+        assert!(total > 0);
+    }
+
+    #[test]
+    fn test_claude_counter() {
+        let counter = ClaudeTokenCounter::new();
+
+        assert_eq!(counter.max_context(), 200_000);
+
+        let text = "Hello, Claude!";
+        let count = counter.count(text);
+        assert!(count > 0);
+    }
+
+    #[test]
+    fn test_claude_counter_system_message() {
+        let counter = ClaudeTokenCounter::new();
+
+        let messages = vec![
+            ChatMessage::system("You are a helpful assistant."),
+            ChatMessage::user("Hello!"),
+        ];
+
+        let total = counter.count_messages(&messages);
+        assert!(total > 0);
+    }
+
+    #[test]
+    fn test_context_window() {
+        let mut window = ContextWindow::new(1000);
+
+        assert_eq!(window.used(), 0);
+        assert_eq!(window.max(), 1000);
+        assert_eq!(window.remaining(), 1000);
+        assert_eq!(window.usage_percent(), 0.0);
+
+        window.add_tokens(200);
+        assert_eq!(window.used(), 200);
+        assert_eq!(window.remaining(), 800);
+        assert_eq!(window.usage_percent(), 0.2);
+
+        window.add_tokens(600);
+        assert_eq!(window.used(), 800);
+        assert!(window.is_near_limit(0.7));
+        assert!(!window.is_near_limit(0.9));
+
+        assert!(window.has_room_for(200));
+        assert!(!window.has_room_for(300));
+
+        window.reset();
+        assert_eq!(window.used(), 0);
+    }
+
+    #[test]
+    fn test_context_window_progress_bar() {
+        let mut window = ContextWindow::new(100);
+
+        window.add_tokens(50);
+        let bar = window.progress_bar(10);
+        assert!(bar.contains("====="));
+        assert!(bar.contains("50.0%"));
+
+        window.add_tokens(40);
+        let bar = window.progress_bar(10);
+        assert!(bar.contains("========="));
+        assert!(bar.contains("90.0%"));
+    }
+
+    #[test]
+    fn test_context_window_saturation() {
+        let mut window = ContextWindow::new(100);
+
+        // Adding more tokens than max should saturate, not overflow
+        window.add_tokens(150);
+        assert_eq!(window.used(), 150);
+        assert_eq!(window.remaining(), 0);
+    }
+
+    #[test]
+    fn test_simple_counter_constructors() {
+        let counter1 = SimpleTokenCounter::default_8k();
+        assert_eq!(counter1.max_context(), 8192);
+
+        let counter2 = SimpleTokenCounter::with_32k();
+        assert_eq!(counter2.max_context(), 32768);
+
+        let counter3 = SimpleTokenCounter::with_128k();
+        assert_eq!(counter3.max_context(), 131072);
+    }
+
+    #[test]
+    fn test_claude_counter_variants() {
+        let haiku = ClaudeTokenCounter::haiku();
+        assert_eq!(haiku.max_context(), 200_000);
+
+        let sonnet = ClaudeTokenCounter::sonnet();
+        assert_eq!(sonnet.max_context(), 200_000);
+
+        let opus = ClaudeTokenCounter::opus();
+        assert_eq!(opus.max_context(), 200_000);
+
+        let custom = ClaudeTokenCounter::with_context(100_000);
+        assert_eq!(custom.max_context(), 100_000);
+    }
+}

crates/llm/ollama/.gitignore

@@ -0,0 +1,22 @@
+/target
+### Rust template
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+### rust-analyzer template
+# Can be generated by other build systems other than cargo (ex: bazelbuild/rust_rules)
+rust-project.json
+
+

crates/llm/ollama/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "llm-ollama"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+llm-core = { path = "../core" }
+reqwest = { version = "0.12", features = ["json", "stream"] }
+tokio = { version = "1.39", features = ["rt-multi-thread", "macros"] }
+futures = "0.3"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "1"
+bytes = "1"
+tokio-stream = "0.1.17"
+async-trait = "0.1"

crates/llm/ollama/README.md

@@ -0,0 +1,14 @@
+# Owlen Ollama Provider
+
+Local LLM integration via Ollama for the Owlen AI agent.
+
+## Overview
+This crate enables the Owlen agent to use local models running via Ollama. This is ideal for privacy-focused workflows or development without an internet connection.
+
+## Features
+- **Local Execution:** No API keys required for basic local use.
+- **Llama 3 / Qwen Support:** Compatible with popular open-source models.
+- **Custom Model URLs:** Connect to Ollama instances running on non-standard ports or remote servers.
+
+## Configuration
+Requires a running Ollama instance. The default connection URL is `http://localhost:11434`.

crates/llm/ollama/src/client.rs

@@ -0,0 +1,358 @@
+use crate::types::{ChatMessage, ChatResponseChunk, Tool};
+use futures::{Stream, StreamExt, TryStreamExt};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+use async_trait::async_trait;
+use llm_core::{
+    LlmProvider, ProviderInfo, LlmError, ChatOptions, ChunkStream,
+    ProviderStatus, AccountInfo, UsageStats, ModelInfo,
+};
+
+#[derive(Debug, Clone)]
+pub struct OllamaClient {
+    http: Client,
+    base_url: String,  // e.g. "http://localhost:11434"
+    api_key: Option<String>,  // For Ollama Cloud authentication
+    current_model: String,  // Default model for this client
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct OllamaOptions {
+    pub model: String,
+    pub stream: bool,
+}
+
+#[derive(Error, Debug)]
+pub enum OllamaError {
+    #[error("http: {0}")]
+    Http(#[from] reqwest::Error),
+    #[error("json: {0}")]
+    Json(#[from] serde_json::Error),
+    #[error("protocol: {0}")]
+    Protocol(String),
+}
+
+// Convert OllamaError to LlmError
+impl From<OllamaError> for LlmError {
+    fn from(err: OllamaError) -> Self {
+        match err {
+            OllamaError::Http(e) => LlmError::Http(e.to_string()),
+            OllamaError::Json(e) => LlmError::Json(e.to_string()),
+            OllamaError::Protocol(msg) => LlmError::Provider(msg),
+        }
+    }
+}
+
+impl OllamaClient {
+    pub fn new(base_url: impl Into<String>) -> Self {
+        Self {
+            http: Client::new(),
+            base_url: base_url.into().trim_end_matches('/').to_string(),
+            api_key: None,
+            current_model: "qwen3:8b".to_string(),
+        }
+    }
+
+    pub fn with_api_key(mut self, api_key: impl Into<String>) -> Self {
+        self.api_key = Some(api_key.into());
+        self
+    }
+
+    pub fn with_model(mut self, model: impl Into<String>) -> Self {
+        self.current_model = model.into();
+        self
+    }
+
+    pub fn with_cloud() -> Self {
+        // Same API, different base
+        Self::new("https://ollama.com")
+    }
+
+    pub async fn chat_stream_raw(
+        &self,
+        messages: &[ChatMessage],
+        opts: &OllamaOptions,
+        tools: Option<&[Tool]>,
+    ) -> Result<impl Stream<Item = Result<ChatResponseChunk, OllamaError>>, OllamaError> {
+        #[derive(Serialize)]
+        struct Body<'a> {
+            model: &'a str,
+            messages: &'a [ChatMessage],
+            stream: bool,
+            #[serde(skip_serializing_if = "Option::is_none")]
+            tools: Option<&'a [Tool]>,
+        }
+        let url = format!("{}/api/chat", self.base_url);
+        let body = Body {model: &opts.model, messages, stream: true, tools};
+        let mut req = self.http.post(url).json(&body);
+
+        // Add Authorization header if API key is present
+        if let Some(ref key) = self.api_key {
+            req = req.header("Authorization", format!("Bearer {}", key));
+        }
+
+        let resp = req.send().await?;
+        let bytes_stream = resp.bytes_stream();
+
+        // NDJSON parser: split by '\n', parse each as JSON and stream the results
+        let out = bytes_stream
+            .map_err(OllamaError::Http)
+            .map_ok(|bytes| {
+                // Convert the chunk to a UTF‑8 string and own it
+                let txt = String::from_utf8_lossy(&bytes).into_owned();
+                // Parse each non‑empty line into a ChatResponseChunk
+                let results: Vec<Result<ChatResponseChunk, OllamaError>> = txt
+                    .lines()
+                    .filter_map(|line| {
+                        let trimmed = line.trim();
+                        if trimmed.is_empty() {
+                            None
+                        } else {
+                            Some(
+                                serde_json::from_str::<ChatResponseChunk>(trimmed)
+                                    .map_err(OllamaError::Json),
+                            )
+                        }
+                    })
+                    .collect();
+                futures::stream::iter(results)
+            })
+            .try_flatten(); // Stream<Item = Result<ChatResponseChunk, OllamaError>>
+        Ok(out)
+    }
+}
+
+// ============================================================================
+// LlmProvider Trait Implementation
+// ============================================================================
+
+#[async_trait]
+impl LlmProvider for OllamaClient {
+    fn name(&self) -> &str {
+        "ollama"
+    }
+
+    fn model(&self) -> &str {
+        &self.current_model
+    }
+
+    async fn chat_stream(
+        &self,
+        messages: &[llm_core::ChatMessage],
+        options: &ChatOptions,
+        tools: Option<&[llm_core::Tool]>,
+    ) -> Result<ChunkStream, LlmError> {
+        // Convert llm_core messages to Ollama messages
+        let ollama_messages: Vec<ChatMessage> = messages.iter().map(|m| m.into()).collect();
+
+        // Convert llm_core tools to Ollama tools if present
+        let ollama_tools: Option<Vec<Tool>> = tools.map(|tools| {
+            tools.iter().map(|t| Tool {
+                tool_type: t.tool_type.clone(),
+                function: crate::types::ToolFunction {
+                    name: t.function.name.clone(),
+                    description: t.function.description.clone(),
+                    parameters: crate::types::ToolParameters {
+                        param_type: t.function.parameters.param_type.clone(),
+                        properties: t.function.parameters.properties.clone(),
+                        required: t.function.parameters.required.clone(),
+                    },
+                },
+            }).collect()
+        });
+
+        let opts = OllamaOptions {
+            model: options.model.clone(),
+            stream: true,
+        };
+
+        // Make the request and build the body inline to avoid lifetime issues
+        #[derive(Serialize)]
+        struct Body<'a> {
+            model: &'a str,
+            messages: &'a [ChatMessage],
+            stream: bool,
+            #[serde(skip_serializing_if = "Option::is_none")]
+            tools: Option<&'a [Tool]>,
+        }
+
+        let url = format!("{}/api/chat", self.base_url);
+        let body = Body {
+            model: &opts.model,
+            messages: &ollama_messages,
+            stream: true,
+            tools: ollama_tools.as_deref(),
+        };
+
+        let mut req = self.http.post(url).json(&body);
+
+        // Add Authorization header if API key is present
+        if let Some(ref key) = self.api_key {
+            req = req.header("Authorization", format!("Bearer {}", key));
+        }
+
+        let resp = req.send().await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        // Check response status
+        let status = resp.status();
+        if !status.is_success() {
+            let error_body = resp.text().await.unwrap_or_else(|_| "unknown error".to_string());
+            return Err(LlmError::Api {
+                message: format!("Ollama API error: {} - {}", status, error_body),
+                code: Some(status.as_str().to_string()),
+            });
+        }
+
+        let bytes_stream = resp.bytes_stream();
+
+        // NDJSON parser with buffering for partial lines across chunks
+        // Uses scan to maintain state (incomplete line buffer) between chunks
+        use std::sync::{Arc, Mutex};
+        let buffer: Arc<Mutex<String>> = Arc::new(Mutex::new(String::new()));
+
+        let converted_stream = bytes_stream
+            .map(move |result| {
+                result.map_err(|e| LlmError::Http(e.to_string()))
+            })
+            .map_ok(move |bytes| {
+                let buffer = Arc::clone(&buffer);
+                // Convert the chunk to a UTF-8 string
+                let txt = String::from_utf8_lossy(&bytes).into_owned();
+
+                // Get the buffered incomplete line from previous chunk
+                let mut buf = buffer.lock().unwrap();
+                let combined = std::mem::take(&mut *buf) + &txt;
+
+                // Split by newlines, keeping track of complete vs incomplete lines
+                let mut results: Vec<Result<llm_core::StreamChunk, LlmError>> = Vec::new();
+                let mut lines: Vec<&str> = combined.split('\n').collect();
+
+                // If the data doesn't end with newline, the last element is incomplete
+                // Save it for the next chunk
+                if !combined.ends_with('\n') && !lines.is_empty() {
+                    *buf = lines.pop().unwrap_or("").to_string();
+                }
+
+                // Parse all complete lines
+                for line in lines {
+                    let trimmed = line.trim();
+                    if !trimmed.is_empty() {
+                        results.push(
+                            serde_json::from_str::<ChatResponseChunk>(trimmed)
+                                .map(|chunk| llm_core::StreamChunk::from(chunk))
+                                .map_err(|e| LlmError::Json(format!("{}: {}", e, trimmed))),
+                        );
+                    }
+                }
+
+                futures::stream::iter(results)
+            })
+            .try_flatten();
+
+        Ok(Box::pin(converted_stream))
+    }
+}
+
+// ============================================================================
+// ProviderInfo Trait Implementation
+// ============================================================================
+
+#[derive(Debug, Clone, Deserialize)]
+struct OllamaModelList {
+    models: Vec<OllamaModel>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[allow(dead_code)] // Fields kept for API completeness
+struct OllamaModel {
+    name: String,
+    #[serde(default)]
+    modified_at: Option<String>,
+    #[serde(default)]
+    size: Option<u64>,
+    #[serde(default)]
+    digest: Option<String>,
+    #[serde(default)]
+    details: Option<OllamaModelDetails>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[allow(dead_code)] // Fields kept for API completeness
+struct OllamaModelDetails {
+    #[serde(default)]
+    format: Option<String>,
+    #[serde(default)]
+    family: Option<String>,
+    #[serde(default)]
+    parameter_size: Option<String>,
+}
+
+#[async_trait]
+impl ProviderInfo for OllamaClient {
+    async fn status(&self) -> Result<ProviderStatus, LlmError> {
+        // Try to ping the Ollama server
+        let url = format!("{}/api/tags", self.base_url);
+        let reachable = self.http.get(&url).send().await.is_ok();
+
+        Ok(ProviderStatus {
+            provider: "ollama".to_string(),
+            authenticated: self.api_key.is_some(),
+            account: None, // Ollama is local, no account info
+            model: self.current_model.clone(),
+            endpoint: self.base_url.clone(),
+            reachable,
+            message: if reachable {
+                Some("Connected to Ollama".to_string())
+            } else {
+                Some("Cannot reach Ollama server".to_string())
+            },
+        })
+    }
+
+    async fn account_info(&self) -> Result<Option<AccountInfo>, LlmError> {
+        // Ollama is a local service, no account info
+        Ok(None)
+    }
+
+    async fn usage_stats(&self) -> Result<Option<UsageStats>, LlmError> {
+        // Ollama doesn't track usage statistics
+        Ok(None)
+    }
+
+    async fn list_models(&self) -> Result<Vec<ModelInfo>, LlmError> {
+        let url = format!("{}/api/tags", self.base_url);
+        let mut req = self.http.get(&url);
+
+        // Add Authorization header if API key is present
+        if let Some(ref key) = self.api_key {
+            req = req.header("Authorization", format!("Bearer {}", key));
+        }
+
+        let resp = req.send().await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        let model_list: OllamaModelList = resp.json().await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        // Convert Ollama models to ModelInfo
+        let models = model_list.models.into_iter().map(|m| {
+            ModelInfo {
+                id: m.name.clone(),
+                display_name: Some(m.name.clone()),
+                description: m.details.as_ref()
+                    .and_then(|d| d.family.as_ref())
+                    .map(|f| format!("{} model", f)),
+                context_window: None, // Ollama doesn't provide this in list
+                max_output_tokens: None,
+                supports_tools: true, // Most Ollama models support tools
+                supports_vision: false, // Would need to check model capabilities
+                input_price_per_mtok: None, // Local models are free
+                output_price_per_mtok: None,
+            }
+        }).collect();
+
+        Ok(models)
+    }
+}

crates/llm/ollama/src/lib.rs

@@ -0,0 +1,13 @@
+pub mod client;
+pub mod types;
+
+pub use client::{OllamaClient, OllamaOptions, OllamaError};
+pub use types::{ChatMessage, ChatResponseChunk, Tool, ToolCall, ToolFunction, ToolParameters, FunctionCall};
+
+// Re-export llm-core traits and types for convenience
+pub use llm_core::{
+    LlmProvider, ProviderInfo, LlmError,
+    ChatOptions, StreamChunk, ToolCallDelta, Usage,
+    ProviderStatus, AccountInfo, UsageStats, ModelInfo,
+    Role,
+};

crates/llm/ollama/src/types.rs

@@ -0,0 +1,130 @@
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use llm_core::{StreamChunk, ToolCallDelta};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ChatMessage {
+    pub role: String, // "user" | "assistant" | "system" | "tool"
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub content: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tool_calls: Option<Vec<ToolCall>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct ToolCall {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub id: Option<String>,
+    #[serde(rename = "type", skip_serializing_if = "Option::is_none")]
+    pub call_type: Option<String>, // "function"
+    pub function: FunctionCall,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct FunctionCall {
+    pub name: String,
+    pub arguments: Value, // JSON object with arguments
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Tool {
+    #[serde(rename = "type")]
+    pub tool_type: String, // "function"
+    pub function: ToolFunction,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolFunction {
+    pub name: String,
+    pub description: String,
+    pub parameters: ToolParameters,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolParameters {
+    #[serde(rename = "type")]
+    pub param_type: String, // "object"
+    pub properties: Value,
+    pub required: Vec<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct ChatResponseChunk {
+    pub model: Option<String>,
+    pub created_at: Option<String>,
+    pub message: Option<ChunkMessage>,
+    pub done: Option<bool>,
+    pub total_duration: Option<u64>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct ChunkMessage {
+    pub role: Option<String>,
+    pub content: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tool_calls: Option<Vec<ToolCall>>,
+}
+
+// ============================================================================
+// Conversions to/from llm-core types
+// ============================================================================
+
+/// Convert from llm_core::ChatMessage to Ollama's ChatMessage
+impl From<&llm_core::ChatMessage> for ChatMessage {
+    fn from(msg: &llm_core::ChatMessage) -> Self {
+        let role = msg.role.as_str().to_string();
+
+        // Convert tool_calls if present
+        let tool_calls = msg.tool_calls.as_ref().map(|calls| {
+            calls.iter().map(|tc| ToolCall {
+                id: Some(tc.id.clone()),
+                call_type: Some(tc.call_type.clone()),
+                function: FunctionCall {
+                    name: tc.function.name.clone(),
+                    arguments: tc.function.arguments.clone(),
+                },
+            }).collect()
+        });
+
+        ChatMessage {
+            role,
+            content: msg.content.clone(),
+            tool_calls,
+        }
+    }
+}
+
+/// Convert from Ollama's ChatResponseChunk to llm_core::StreamChunk
+impl From<ChatResponseChunk> for StreamChunk {
+    fn from(chunk: ChatResponseChunk) -> Self {
+        let done = chunk.done.unwrap_or(false);
+        let content = chunk.message.as_ref().and_then(|m| m.content.clone());
+
+        // Convert tool calls to deltas
+        let tool_calls = chunk.message.as_ref().and_then(|m| {
+            m.tool_calls.as_ref().map(|calls| {
+                calls.iter().enumerate().map(|(index, tc)| {
+                    // Serialize arguments back to JSON string for delta
+                    let arguments_delta = serde_json::to_string(&tc.function.arguments).ok();
+
+                    ToolCallDelta {
+                        index,
+                        id: tc.id.clone(),
+                        function_name: Some(tc.function.name.clone()),
+                        arguments_delta,
+                    }
+                }).collect()
+            })
+        });
+
+        // Ollama doesn't provide per-chunk usage stats, only in final chunk
+        let usage = None;
+
+        StreamChunk {
+            content,
+            tool_calls,
+            done,
+            usage,
+        }
+    }
+}

crates/llm/ollama/tests/ndjson.rs

@@ -0,0 +1,12 @@
+use llm_ollama::{OllamaClient, OllamaOptions};
+
+// This test stubs NDJSON by spinning a tiny local server is overkill for M0.
+// Instead, test the line parser indirectly by mocking reqwest is complex.
+// We'll smoke-test the client type compiles and leave end-to-end to cli tests.
+
+#[tokio::test]
+async fn client_compiles_smoke() {
+    let _ = OllamaClient::new("http://localhost:11434");
+    let _ = OllamaClient::with_cloud();
+    let _ = OllamaOptions { model: "qwen2.5".into(), stream: true };
+}

crates/llm/openai/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "llm-openai"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+description = "OpenAI GPT API client for Owlen"
+
+[dependencies]
+llm-core = { path = "../core" }
+async-trait = "0.1"
+futures = "0.3"
+reqwest = { version = "0.12", features = ["json", "stream"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tokio = { version = "1", features = ["sync", "time", "io-util"] }
+tokio-stream = { version = "0.1", default-features = false, features = ["io-util"] }
+tokio-util = { version = "0.7", features = ["codec", "io"] }
+tracing = "0.1"

crates/llm/openai/README.md

@@ -0,0 +1,14 @@
+# Owlen OpenAI Provider
+
+OpenAI GPT integration for the Owlen AI agent.
+
+## Overview
+This crate provides the implementation of the `LlmProvider` trait for OpenAI's models (e.g., GPT-4o). It supports the standard OpenAI chat completion API, including tool calling and streaming.
+
+## Features
+- **GPT-4o Support:** Reliable integration with flagship OpenAI models.
+- **Function Calling:** Full support for OpenAI's tool/function calling mechanism.
+- **Streaming:** Robust real-time response generation.
+
+## Configuration
+Requires an `OPENAI_API_KEY` to be set in the environment or configuration.

crates/llm/openai/src/auth.rs

@@ -0,0 +1,304 @@
+//! OpenAI OAuth Authentication
+//!
+//! Implements device code flow for authenticating with OpenAI without API keys.
+
+use llm_core::{AuthMethod, DeviceAuthResult, DeviceCodeResponse, LlmError, OAuthProvider};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+
+/// OAuth client for OpenAI device flow
+pub struct OpenAIAuth {
+    http: Client,
+    client_id: String,
+}
+
+// OpenAI OAuth endpoints
+const AUTH_BASE_URL: &str = "https://auth.openai.com";
+const DEVICE_CODE_ENDPOINT: &str = "/oauth/device/code";
+const TOKEN_ENDPOINT: &str = "/oauth/token";
+
+// Default client ID for Owlen CLI
+const DEFAULT_CLIENT_ID: &str = "owlen-cli";
+
+// User-Agent to avoid bot protection blocks
+const USER_AGENT: &str = concat!("owlen/", env!("CARGO_PKG_VERSION"));
+
+impl OpenAIAuth {
+    /// Create a new OAuth client with the default CLI client ID
+    pub fn new() -> Self {
+        let http = Client::builder()
+            .user_agent(USER_AGENT)
+            .build()
+            .unwrap_or_else(|_| Client::new());
+
+        Self {
+            http,
+            client_id: DEFAULT_CLIENT_ID.to_string(),
+        }
+    }
+
+    /// Create with a custom client ID
+    pub fn with_client_id(client_id: impl Into<String>) -> Self {
+        let http = Client::builder()
+            .user_agent(USER_AGENT)
+            .build()
+            .unwrap_or_else(|_| Client::new());
+
+        Self {
+            http,
+            client_id: client_id.into(),
+        }
+    }
+
+    /// Check if OAuth is available for OpenAI
+    /// Currently, OpenAI doesn't provide public OAuth device code flow for third-party CLI tools.
+    pub fn is_oauth_available() -> bool {
+        false
+    }
+}
+
+impl Default for OpenAIAuth {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(Debug, Serialize)]
+struct DeviceCodeRequest<'a> {
+    client_id: &'a str,
+    scope: &'a str,
+}
+
+#[derive(Debug, Deserialize)]
+struct DeviceCodeApiResponse {
+    device_code: String,
+    user_code: String,
+    verification_uri: String,
+    verification_uri_complete: Option<String>,
+    expires_in: u64,
+    interval: u64,
+}
+
+#[derive(Debug, Serialize)]
+struct TokenRequest<'a> {
+    client_id: &'a str,
+    device_code: &'a str,
+    grant_type: &'a str,
+}
+
+#[derive(Debug, Deserialize)]
+struct TokenApiResponse {
+    access_token: String,
+    #[allow(dead_code)]
+    token_type: String,
+    expires_in: Option<u64>,
+    refresh_token: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+struct TokenErrorResponse {
+    error: String,
+    error_description: Option<String>,
+}
+
+#[async_trait::async_trait]
+impl OAuthProvider for OpenAIAuth {
+    async fn start_device_auth(&self) -> Result<DeviceCodeResponse, LlmError> {
+        let url = format!("{}{}", AUTH_BASE_URL, DEVICE_CODE_ENDPOINT);
+
+        let request = DeviceCodeRequest {
+            client_id: &self.client_id,
+            scope: "api.read api.write",
+        };
+
+        let response = self
+            .http
+            .post(&url)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if !response.status().is_success() {
+            let status = response.status();
+            let text = response
+                .text()
+                .await
+                .unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(LlmError::Auth(format!(
+                "Device code request failed ({}): {}",
+                status, text
+            )));
+        }
+
+        let api_response: DeviceCodeApiResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        Ok(DeviceCodeResponse {
+            device_code: api_response.device_code,
+            user_code: api_response.user_code,
+            verification_uri: api_response.verification_uri,
+            verification_uri_complete: api_response.verification_uri_complete,
+            expires_in: api_response.expires_in,
+            interval: api_response.interval,
+        })
+    }
+
+    async fn poll_device_auth(&self, device_code: &str) -> Result<DeviceAuthResult, LlmError> {
+        let url = format!("{}{}", AUTH_BASE_URL, TOKEN_ENDPOINT);
+
+        let request = TokenRequest {
+            client_id: &self.client_id,
+            device_code,
+            grant_type: "urn:ietf:params:oauth:grant-type:device_code",
+        };
+
+        let response = self
+            .http
+            .post(&url)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if response.status().is_success() {
+            let token_response: TokenApiResponse = response
+                .json()
+                .await
+                .map_err(|e| LlmError::Json(e.to_string()))?;
+
+            return Ok(DeviceAuthResult::Success {
+                access_token: token_response.access_token,
+                refresh_token: token_response.refresh_token,
+                expires_in: token_response.expires_in,
+            });
+        }
+
+        // Parse error response
+        let error_response: TokenErrorResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        match error_response.error.as_str() {
+            "authorization_pending" => Ok(DeviceAuthResult::Pending),
+            "slow_down" => Ok(DeviceAuthResult::Pending),
+            "access_denied" => Ok(DeviceAuthResult::Denied),
+            "expired_token" => Ok(DeviceAuthResult::Expired),
+            _ => Err(LlmError::Auth(format!(
+                "Token request failed: {} - {}",
+                error_response.error,
+                error_response.error_description.unwrap_or_default()
+            ))),
+        }
+    }
+
+    async fn refresh_token(&self, refresh_token: &str) -> Result<AuthMethod, LlmError> {
+        let url = format!("{}{}", AUTH_BASE_URL, TOKEN_ENDPOINT);
+
+        #[derive(Serialize)]
+        struct RefreshRequest<'a> {
+            client_id: &'a str,
+            refresh_token: &'a str,
+            grant_type: &'a str,
+        }
+
+        let request = RefreshRequest {
+            client_id: &self.client_id,
+            refresh_token,
+            grant_type: "refresh_token",
+        };
+
+        let response = self
+            .http
+            .post(&url)
+            .json(&request)
+            .send()
+            .await
+            .map_err(|e| LlmError::Http(e.to_string()))?;
+
+        if !response.status().is_success() {
+            let text = response
+                .text()
+                .await
+                .unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(LlmError::Auth(format!("Token refresh failed: {}", text)));
+        }
+
+        let token_response: TokenApiResponse = response
+            .json()
+            .await
+            .map_err(|e| LlmError::Json(e.to_string()))?;
+
+        let expires_at = token_response.expires_in.map(|secs| {
+            std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .map(|d| d.as_secs() + secs)
+                .unwrap_or(0)
+        });
+
+        Ok(AuthMethod::OAuth {
+            access_token: token_response.access_token,
+            refresh_token: token_response.refresh_token,
+            expires_at,
+        })
+    }
+}
+
+/// Helper to perform the full device auth flow with polling
+pub async fn perform_device_auth<F>(
+    auth: &OpenAIAuth,
+    on_code: F,
+) -> Result<AuthMethod, LlmError>
+where
+    F: FnOnce(&DeviceCodeResponse),
+{
+    // Start the device flow
+    let device_code = auth.start_device_auth().await?;
+
+    // Let caller display the code to user
+    on_code(&device_code);
+
+    // Poll for completion
+    let poll_interval = std::time::Duration::from_secs(device_code.interval);
+    let deadline =
+        std::time::Instant::now() + std::time::Duration::from_secs(device_code.expires_in);
+
+    loop {
+        if std::time::Instant::now() > deadline {
+            return Err(LlmError::Auth("Device code expired".to_string()));
+        }
+
+        tokio::time::sleep(poll_interval).await;
+
+        match auth.poll_device_auth(&device_code.device_code).await? {
+            DeviceAuthResult::Success {
+                access_token,
+                refresh_token,
+                expires_in,
+            } => {
+                let expires_at = expires_in.map(|secs| {
+                    std::time::SystemTime::now()
+                        .duration_since(std::time::UNIX_EPOCH)
+                        .map(|d| d.as_secs() + secs)
+                        .unwrap_or(0)
+                });
+
+                return Ok(AuthMethod::OAuth {
+                    access_token,
+                    refresh_token,
+                    expires_at,
+                });
+            }
+            DeviceAuthResult::Pending => continue,
+            DeviceAuthResult::Denied => {
+                return Err(LlmError::Auth("Authorization denied by user".to_string()));
+            }
+            DeviceAuthResult::Expired => {
+                return Err(LlmError::Auth("Device code expired".to_string()));
+            }
+        }
+    }
+}