feat(v1.0): remove legacy MCP mode and complete Phase 10 migration
This commit completes the Phase 10 migration to MCP-only architecture by removing all legacy mode code paths and configuration options. **Breaking Changes:** - Removed `McpMode` enum from configuration system - Removed `mode` setting from `[mcp]` config section - MCP architecture is now always enabled (no option to disable) **Code Changes:** - Simplified `McpSettings` struct (now a placeholder for future options) - Updated `McpClientFactory` to remove legacy mode branching - Always use MCP architecture with automatic fallback to local client - Added test infrastructure: `MockProvider` and `MockMcpClient` in test_utils **Documentation:** - Created comprehensive v0.x → v1.0 migration guide - Added CHANGELOG_v1.0.md with detailed technical changes - Documented common issues (cloud model 404s, timeouts, API key setup) - Included rollback procedures and troubleshooting steps **Testing:** - All 29 tests passing - Fixed agent tests to use new mock implementations - Updated factory test to reflect new behavior This completes the 10-phase migration plan documented in .agents/new_phases.md, establishing Owlen as a production-ready MCP-only TUI application. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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docs/CHANGELOG_v1.0.md
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docs/CHANGELOG_v1.0.md
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# Changelog for v1.0.0 - MCP-Only Architecture
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## Summary
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Version 1.0.0 marks the completion of the MCP-only architecture migration, removing all legacy code paths and fully embracing the Model Context Protocol for all LLM interactions and tool executions.
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## Breaking Changes
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### 1. Removed Legacy MCP Mode
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**What changed:**
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- The `[mcp]` section in `config.toml` no longer accepts a `mode` setting
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- The `McpMode` enum has been removed from the configuration system
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- MCP architecture is now always enabled - no option to disable it
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**Migration:**
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```diff
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# old config.toml
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[mcp]
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-mode = "legacy" # or "enabled"
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# new config.toml
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[mcp]
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# MCP is always enabled - no mode setting needed
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```
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**Code changes:**
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- `crates/owlen-core/src/config.rs`: Removed `McpMode` enum, simplified `McpSettings`
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- `crates/owlen-core/src/mcp/factory.rs`: Removed legacy mode handling from `McpClientFactory`
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- All provider calls now go through MCP clients exclusively
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### 2. Updated MCP Client Factory
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**What changed:**
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- `McpClientFactory::create()` no longer checks for legacy mode
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- Automatically falls back to `LocalMcpClient` when no external MCP servers are configured
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- Improved error messages for server connection failures
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**Before:**
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```rust
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match self.config.mcp.mode {
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McpMode::Legacy => { /* use local */ },
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McpMode::Enabled => { /* use remote or fallback */ },
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}
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```
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**After:**
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```rust
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// Always use MCP architecture
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if let Some(server_cfg) = self.config.mcp_servers.first() {
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// Try remote server, fallback to local on error
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} else {
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// Use local client
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}
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```
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## New Features
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### Test Infrastructure
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Added comprehensive mock implementations for testing:
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1. **MockProvider** (`crates/owlen-core/src/provider.rs`)
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- Located in `provider::test_utils` module
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- Provides a simple provider for unit tests
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- Implements all required `Provider` trait methods
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2. **MockMcpClient** (`crates/owlen-core/src/mcp.rs`)
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- Located in `mcp::test_utils` module
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- Provides a simple MCP client for unit tests
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- Returns mock tool descriptors and responses
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### Documentation
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1. **Migration Guide** (`docs/migration-guide.md`)
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- Comprehensive guide for migrating from v0.x to v1.0
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- Step-by-step configuration update instructions
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- Common issues and troubleshooting
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- Rollback procedures if needed
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2. **Updated Configuration Reference**
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- Removed references to legacy mode
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- Clarified MCP server configuration
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- Added examples for local and cloud Ollama usage
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## Bug Fixes
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- Fixed test compilation errors due to missing mock implementations
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- Resolved ambiguous glob re-export warnings (non-critical, test-only)
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## Internal Changes
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### Configuration System
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- `McpSettings` struct now only serves as a placeholder for future MCP-specific settings
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- Removed `McpMode` enum entirely
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- Default configuration no longer includes mode setting
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### MCP Factory
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- Simplified factory logic by removing mode branching
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- Improved fallback behavior with better error messages
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- Test renamed to reflect new behavior: `test_factory_creates_local_client_when_no_servers_configured`
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## Performance
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No performance regressions expected. The MCP architecture may actually improve performance by:
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- Removing unnecessary mode checks
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- Streamlining the client creation process
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- Better error handling reduces retry overhead
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## Compatibility
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### Backwards Compatibility
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**Breaking:** Configuration files with `mode = "legacy"` will need to be updated:
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- The setting is ignored (logs a warning in future versions)
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- User config has been automatically updated if using standard path
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### Forward Compatibility
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The `McpSettings` struct is kept for future expansion:
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- Can add MCP-specific timeouts
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- Can add connection pooling settings
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- Can add server selection strategies
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## Testing
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All tests passing:
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```
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test result: ok. 29 passed; 0 failed; 0 ignored
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```
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Key test areas:
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- Agent ReAct pattern parsing
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- MCP client factory creation
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- Configuration loading and validation
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- Mode-based tool filtering
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- Permission and consent handling
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## Upgrade Instructions
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See [Migration Guide](migration-guide.md) for detailed instructions.
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**Quick upgrade:**
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1. Update your `~/.config/owlen/config.toml`:
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```bash
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# Remove the 'mode' line from [mcp] section
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sed -i '/^mode = /d' ~/.config/owlen/config.toml
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```
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2. Rebuild Owlen:
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```bash
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cargo build --release
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```
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3. Test with a simple query:
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```bash
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owlen
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```
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## Known Issues
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1. **Warning about ambiguous glob re-exports** - Non-critical, only affects test builds
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2. **First inference may be slow** - Ollama loads models on first use (expected behavior)
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3. **Cloud model 404 errors** - Ensure model names match Ollama Cloud's naming (remove `-cloud` suffix from model names)
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## Contributors
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This release completes the Phase 10 migration plan documented in `.agents/new_phases.md`.
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## Related Issues
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- Closes: Legacy mode removal
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- Implements: Phase 10 cleanup and production polish
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- References: MCP architecture migration phases 1-10
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