From 9b4eeaff2ae98bc03241ea01a7f3024f62ab66ec Mon Sep 17 00:00:00 2001
From: vikingowl <christian@nachtigall.dev>
Date: Thu, 22 Jan 2026 12:02:13 +0100
Subject: [PATCH] feat(agents): implement agents feature (v1)

Adds agents feature with the following capabilities:
- Agent identity: name, description
- System prompt reference from Prompt Library (promptId)
- Tool set: subset of available tools (enabledToolNames)
- Optional preferred model
- CRUD operations with IndexedDB storage (schema v7)
- Project-agent relationships (many-to-many via junction table)
- Per-chat agent selection via AgentSelector component
- Settings UI via AgentsTab in Settings page

Integration:
- Agent tools filter LLM tool calls via getToolDefinitionsForAgent()
- Agent prompt integrates with prompt resolution (priority 3)
- AgentSelector dropdown in chat UI (opens upward)

Tests:
- 22 storage layer tests
- 22 state management tests
- 7 tool integration tests
- 9 prompt resolution tests
- 14 E2E tests

Closes #7
---
 frontend/e2e/agents.spec.ts                   | 278 ++++++++++
 frontend/package-lock.json                    |  11 +
 frontend/package.json                         |   1 +
 frontend/playwright.config.ts                 |   2 +-
 .../lib/components/chat/AgentSelector.svelte  | 217 ++++++++
 .../src/lib/components/chat/ChatWindow.svelte |  50 +-
 .../chat/SystemPromptSelector.svelte          |   4 +-
 .../lib/components/settings/AgentsTab.svelte  | 500 ++++++++++++++++++
 .../components/settings/SettingsTabs.svelte   |   7 +-
 frontend/src/lib/components/settings/index.ts |   1 +
 .../lib/services/prompt-resolution.test.ts    |   2 +
 .../src/lib/services/prompt-resolution.ts     |  42 +-
 frontend/src/lib/storage/agents.test.ts       | 366 +++++++++++++
 frontend/src/lib/storage/agents.ts            | 220 ++++++++
 frontend/src/lib/storage/conversations.ts     |  11 +
 frontend/src/lib/storage/db.ts                |  61 +++
 frontend/src/lib/storage/index.ts             |  17 +
 frontend/src/lib/stores/agents.svelte.ts      | 199 +++++++
 frontend/src/lib/stores/agents.test.ts        | 280 ++++++++++
 .../src/lib/stores/conversations.svelte.ts    |   9 +
 frontend/src/lib/stores/index.ts              |   1 +
 frontend/src/lib/stores/tools-agent.test.ts   | 131 +++++
 frontend/src/lib/stores/tools.svelte.ts       |  51 ++
 frontend/src/lib/types/conversation.ts        |   2 +
 frontend/src/routes/settings/+page.svelte     |   3 +
 25 files changed, 2444 insertions(+), 22 deletions(-)
 create mode 100644 frontend/e2e/agents.spec.ts
 create mode 100644 frontend/src/lib/components/chat/AgentSelector.svelte
 create mode 100644 frontend/src/lib/components/settings/AgentsTab.svelte
 create mode 100644 frontend/src/lib/storage/agents.test.ts
 create mode 100644 frontend/src/lib/storage/agents.ts
 create mode 100644 frontend/src/lib/stores/agents.svelte.ts
 create mode 100644 frontend/src/lib/stores/agents.test.ts
 create mode 100644 frontend/src/lib/stores/tools-agent.test.ts

diff --git a/frontend/e2e/agents.spec.ts b/frontend/e2e/agents.spec.ts
new file mode 100644
index 0000000..9675a62
--- /dev/null
+++ b/frontend/e2e/agents.spec.ts
@@ -0,0 +1,278 @@
+/**
+ * E2E tests for Agents feature
+ *
+ * Tests the agents UI in settings and chat integration
+ */
+
+import { test, expect } from '@playwright/test';
+
+test.describe('Agents', () => {
+	test('settings page has agents tab', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Should show agents tab content - use exact match for the main heading
+		await expect(page.getByRole('heading', { name: 'Agents', exact: true })).toBeVisible({
+			timeout: 10000
+		});
+	});
+
+	test('agents tab shows empty state initially', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Should show empty state message
+		await expect(page.getByRole('heading', { name: 'No agents yet' })).toBeVisible({ timeout: 10000 });
+	});
+
+	test('has create agent button', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Should have create button in the header (not the empty state button)
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await expect(createButton).toBeVisible({ timeout: 10000 });
+	});
+
+	test('can open create agent dialog', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Click create button (the one in the header)
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		// Dialog should appear with form fields
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await expect(page.getByLabel('Name *')).toBeVisible();
+	});
+
+	test('can create new agent', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Open create dialog
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		// Wait for dialog
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+
+		// Fill in agent details
+		await page.getByLabel('Name *').fill('Test Agent');
+		await page.getByLabel('Description').fill('A test agent for E2E testing');
+
+		// Submit the form - use the submit button inside the dialog
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		// Dialog should close and agent should appear in the list
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+		await expect(page.getByRole('heading', { name: 'Test Agent' })).toBeVisible({ timeout: 5000 });
+	});
+
+	test('can edit existing agent', async ({ page }) => {
+		// First create an agent
+		await page.goto('/settings?tab=agents');
+
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Edit Me Agent');
+		await page.getByLabel('Description').fill('Will be edited');
+
+		// Submit via dialog button
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		// Wait for agent to appear
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+		await expect(page.getByText('Edit Me Agent')).toBeVisible({ timeout: 5000 });
+
+		// Click edit button (aria-label)
+		const editButton = page.getByRole('button', { name: 'Edit agent' });
+		await editButton.click();
+
+		// Edit the name in the dialog
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Edited Agent');
+
+		// Save changes
+		await dialog.getByRole('button', { name: 'Save Changes' }).click();
+
+		// Should show updated name
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+		await expect(page.getByText('Edited Agent')).toBeVisible({ timeout: 5000 });
+	});
+
+	test('can delete agent', async ({ page }) => {
+		// First create an agent
+		await page.goto('/settings?tab=agents');
+
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Delete Me Agent');
+		await page.getByLabel('Description').fill('Will be deleted');
+
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		// Wait for agent to appear
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+		await expect(page.getByText('Delete Me Agent')).toBeVisible({ timeout: 5000 });
+
+		// Click delete button (aria-label)
+		const deleteButton = page.getByRole('button', { name: 'Delete agent' });
+		await deleteButton.click();
+
+		// Confirm deletion in dialog - look for the Delete button in the confirm dialog
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		const confirmDialog = page.getByRole('dialog');
+		await confirmDialog.getByRole('button', { name: 'Delete' }).click();
+
+		// Agent should be removed
+		await expect(page.getByRole('heading', { name: 'Delete Me Agent' })).not.toBeVisible({ timeout: 5000 });
+	});
+
+	test('can navigate to agents tab via navigation', async ({ page }) => {
+		await page.goto('/settings');
+
+		// Click on agents tab link
+		const agentsTab = page.getByRole('link', { name: 'Agents' });
+		await agentsTab.click();
+
+		// URL should update
+		await expect(page).toHaveURL(/tab=agents/);
+
+		// Agents content should be visible
+		await expect(page.getByRole('heading', { name: 'Agents', exact: true })).toBeVisible();
+	});
+});
+
+test.describe('Agent Tool Selection', () => {
+	test('can select tools for agent', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Open create dialog
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Tool Agent');
+		await page.getByLabel('Description').fill('Agent with specific tools');
+
+		// Look for Allowed Tools section
+		await expect(page.getByText('Allowed Tools', { exact: true })).toBeVisible({ timeout: 5000 });
+
+		// Save the agent
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		// Agent should be created
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+		await expect(page.getByText('Tool Agent')).toBeVisible({ timeout: 5000 });
+	});
+});
+
+test.describe('Agent Prompt Selection', () => {
+	test('can assign prompt to agent', async ({ page }) => {
+		await page.goto('/settings?tab=agents');
+
+		// Open create dialog
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Prompt Agent');
+		await page.getByLabel('Description').fill('Agent with a prompt');
+
+		// Look for System Prompt selector
+		await expect(page.getByLabel('System Prompt')).toBeVisible({ timeout: 5000 });
+
+		// Save the agent
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		// Agent should be created
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+		await expect(page.getByText('Prompt Agent')).toBeVisible({ timeout: 5000 });
+	});
+});
+
+test.describe('Agent Chat Integration', () => {
+	test('agent selector appears on home page', async ({ page }) => {
+		await page.goto('/');
+
+		// Agent selector button should be visible (shows "No agent" by default)
+		await expect(page.getByRole('button', { name: /No agent/i })).toBeVisible({ timeout: 10000 });
+	});
+
+	test('agent selector dropdown shows "No agents" when none exist', async ({ page }) => {
+		await page.goto('/');
+
+		// Click on agent selector
+		const agentButton = page.getByRole('button', { name: /No agent/i });
+		await agentButton.click();
+
+		// Should show "No agents available" message
+		await expect(page.getByText('No agents available')).toBeVisible({ timeout: 5000 });
+
+		// Should have link to create agents
+		await expect(page.getByRole('link', { name: 'Create one' })).toBeVisible();
+	});
+
+	test('agent selector shows created agents', async ({ page }) => {
+		// First create an agent
+		await page.goto('/settings?tab=agents');
+
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Chat Agent');
+		await page.getByLabel('Description').fill('Agent for chat testing');
+
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+
+		// Now go to home page and check agent selector
+		await page.goto('/');
+
+		const agentButton = page.getByRole('button', { name: /No agent/i });
+		await agentButton.click();
+
+		// Should show the created agent
+		await expect(page.getByText('Chat Agent')).toBeVisible({ timeout: 5000 });
+		await expect(page.getByText('Agent for chat testing')).toBeVisible();
+	});
+
+	test('can select agent from dropdown', async ({ page }) => {
+		// First create an agent
+		await page.goto('/settings?tab=agents');
+
+		const createButton = page.getByRole('button', { name: 'Create Agent' }).first();
+		await createButton.click();
+
+		await expect(page.getByRole('dialog')).toBeVisible({ timeout: 5000 });
+		await page.getByLabel('Name *').fill('Selectable Agent');
+		await page.getByLabel('Description').fill('Can be selected');
+
+		const dialog = page.getByRole('dialog');
+		await dialog.getByRole('button', { name: 'Create Agent' }).click();
+
+		await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 5000 });
+
+		// Go to home page
+		await page.goto('/');
+
+		// Open agent selector
+		const agentButton = page.getByRole('button', { name: /No agent/i });
+		await agentButton.click();
+
+		// Select the agent
+		await page.getByText('Selectable Agent').click();
+
+		// Button should now show the agent name
+		await expect(page.getByRole('button', { name: /Selectable Agent/i })).toBeVisible({ timeout: 5000 });
+	});
+});
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index e913e5f..47da1be 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -36,6 +36,7 @@
         "@testing-library/svelte": "^5.3.1",
         "@types/node": "^22.10.0",
         "autoprefixer": "^10.4.20",
+        "fake-indexeddb": "^6.2.5",
         "jsdom": "^27.4.0",
         "postcss": "^8.4.49",
         "svelte": "^5.16.0",
@@ -2557,6 +2558,16 @@
         "node": ">=12.0.0"
       }
     },
+    "node_modules/fake-indexeddb": {
+      "version": "6.2.5",
+      "resolved": "https://registry.npmjs.org/fake-indexeddb/-/fake-indexeddb-6.2.5.tgz",
+      "integrity": "sha512-CGnyrvbhPlWYMngksqrSSUT1BAVP49dZocrHuK0SvtR0D5TMs5wP0o3j7jexDJW01KSadjBp1M/71o/KR3nD1w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/fast-glob": {
       "version": "3.3.3",
       "license": "MIT",
diff --git a/frontend/package.json b/frontend/package.json
index 42174ae..1238781 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -26,6 +26,7 @@
     "@testing-library/svelte": "^5.3.1",
     "@types/node": "^22.10.0",
     "autoprefixer": "^10.4.20",
+    "fake-indexeddb": "^6.2.5",
     "jsdom": "^27.4.0",
     "postcss": "^8.4.49",
     "svelte": "^5.16.0",
diff --git a/frontend/playwright.config.ts b/frontend/playwright.config.ts
index 98b959c..c50fcc2 100644
--- a/frontend/playwright.config.ts
+++ b/frontend/playwright.config.ts
@@ -8,7 +8,7 @@ export default defineConfig({
 	workers: process.env.CI ? 1 : undefined,
 	reporter: 'html',
 	use: {
-		baseURL: 'http://localhost:7842',
+		baseURL: process.env.BASE_URL || 'http://localhost:7842',
 		trace: 'on-first-retry',
 		screenshot: 'only-on-failure'
 	},
diff --git a/frontend/src/lib/components/chat/AgentSelector.svelte b/frontend/src/lib/components/chat/AgentSelector.svelte
new file mode 100644
index 0000000..6d3da70
--- /dev/null
+++ b/frontend/src/lib/components/chat/AgentSelector.svelte
@@ -0,0 +1,217 @@
+<script lang="ts">
+	/**
+	 * AgentSelector - Dropdown to select an agent for the current conversation
+	 * Agents define a system prompt and tool set for the conversation
+	 */
+	import { agentsState, conversationsState, toastState } from '$lib/stores';
+	import { updateAgentId } from '$lib/storage';
+
+	interface Props {
+		conversationId?: string | null;
+		currentAgentId?: string | null;
+		/** Callback for 'new' mode - called when agent is selected without a conversation */
+		onSelect?: (agentId: string | null) => void;
+	}
+
+	let { conversationId = null, currentAgentId = null, onSelect }: Props = $props();
+
+	// UI state
+	let isOpen = $state(false);
+	let dropdownElement: HTMLDivElement | null = $state(null);
+
+	// Available agents from store
+	const agents = $derived(agentsState.sortedAgents);
+
+	// Current agent for this conversation
+	const currentAgent = $derived(
+		currentAgentId ? agents.find((a) => a.id === currentAgentId) : null
+	);
+
+	// Display text for the button
+	const buttonText = $derived(currentAgent?.name ?? 'No agent');
+
+	function toggleDropdown(): void {
+		isOpen = !isOpen;
+	}
+
+	function closeDropdown(): void {
+		isOpen = false;
+	}
+
+	async function handleSelect(agentId: string | null): Promise<void> {
+		// In 'new' mode (no conversation), use the callback
+		if (!conversationId) {
+			onSelect?.(agentId);
+			const agentName = agentId ? agents.find((a) => a.id === agentId)?.name : null;
+			toastState.success(agentName ? `Using "${agentName}"` : 'No agent selected');
+			closeDropdown();
+			return;
+		}
+
+		// Update in storage for existing conversation
+		const result = await updateAgentId(conversationId, agentId);
+		if (result.success) {
+			conversationsState.setAgentId(conversationId, agentId);
+			const agentName = agentId ? agents.find((a) => a.id === agentId)?.name : null;
+			toastState.success(agentName ? `Using "${agentName}"` : 'No agent selected');
+		} else {
+			toastState.error('Failed to update agent');
+		}
+
+		closeDropdown();
+	}
+
+	function handleClickOutside(event: MouseEvent): void {
+		if (dropdownElement && !dropdownElement.contains(event.target as Node)) {
+			closeDropdown();
+		}
+	}
+
+	function handleKeydown(event: KeyboardEvent): void {
+		if (event.key === 'Escape' && isOpen) {
+			closeDropdown();
+		}
+	}
+</script>
+
+<svelte:window onclick={handleClickOutside} onkeydown={handleKeydown} />
+
+<div class="relative" bind:this={dropdownElement}>
+	<!-- Trigger button -->
+	<button
+		type="button"
+		onclick={toggleDropdown}
+		class="flex items-center gap-1.5 rounded-lg px-2.5 py-1.5 text-xs font-medium transition-colors {currentAgent
+			? 'bg-indigo-500/20 text-indigo-300'
+			: 'text-theme-muted hover:bg-theme-secondary hover:text-theme-secondary'}"
+		title={currentAgent ? `Agent: ${currentAgent.name}` : 'Select an agent'}
+	>
+		<!-- Robot icon -->
+		<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="h-3.5 w-3.5">
+			<path fill-rule="evenodd" d="M10 1a.75.75 0 0 1 .75.75v1.5a.75.75 0 0 1-1.5 0v-1.5A.75.75 0 0 1 10 1ZM5.05 3.05a.75.75 0 0 1 1.06 0l1.062 1.06A.75.75 0 1 1 6.11 5.173L5.05 4.11a.75.75 0 0 1 0-1.06Zm9.9 0a.75.75 0 0 1 0 1.06l-1.06 1.062a.75.75 0 0 1-1.062-1.061l1.061-1.06a.75.75 0 0 1 1.06 0ZM3 8a7 7 0 0 1 14 0v2a1 1 0 0 0 1 1h.25a.75.75 0 0 1 0 1.5H18v1a3 3 0 0 1-3 3H5a3 3 0 0 1-3-3v-1h-.25a.75.75 0 0 1 0-1.5H2a1 1 0 0 0 1-1V8Zm5.75 3.5a.75.75 0 0 0-1.5 0v1a.75.75 0 0 0 1.5 0v-1Zm4 0a.75.75 0 0 0-1.5 0v1a.75.75 0 0 0 1.5 0v-1Z" clip-rule="evenodd" />
+		</svg>
+		<span class="max-w-[100px] truncate">{buttonText}</span>
+		<svg
+			xmlns="http://www.w3.org/2000/svg"
+			viewBox="0 0 20 20"
+			fill="currentColor"
+			class="h-3.5 w-3.5 transition-transform {isOpen ? 'rotate-180' : ''}"
+		>
+			<path
+				fill-rule="evenodd"
+				d="M5.22 8.22a.75.75 0 0 1 1.06 0L10 11.94l3.72-3.72a.75.75 0 1 1 1.06 1.06l-4.25 4.25a.75.75 0 0 1-1.06 0L5.22 9.28a.75.75 0 0 1 0-1.06Z"
+				clip-rule="evenodd"
+			/>
+		</svg>
+	</button>
+
+	<!-- Dropdown menu (opens upward) -->
+	{#if isOpen}
+		<div
+			class="absolute bottom-full left-0 z-50 mb-1 max-h-80 w-64 overflow-y-auto rounded-lg border border-theme bg-theme-secondary py-1 shadow-xl"
+		>
+			<!-- No agent option -->
+			<div class="px-3 py-1.5 text-xs font-medium text-theme-muted uppercase tracking-wide">
+				Default
+			</div>
+			<button
+				type="button"
+				onclick={() => handleSelect(null)}
+				class="flex w-full items-center gap-2 px-3 py-2 text-left text-sm transition-colors hover:bg-theme-tertiary {!currentAgentId
+					? 'bg-theme-tertiary/50 text-theme-primary'
+					: 'text-theme-secondary'}"
+			>
+				<div class="flex-1">
+					<span>No agent</span>
+					<div class="mt-0.5 text-xs text-theme-muted">
+						Use default tools and prompts
+					</div>
+				</div>
+				{#if !currentAgentId}
+					<svg
+						xmlns="http://www.w3.org/2000/svg"
+						viewBox="0 0 20 20"
+						fill="currentColor"
+						class="h-4 w-4 text-emerald-400"
+					>
+						<path
+							fill-rule="evenodd"
+							d="M16.704 4.153a.75.75 0 0 1 .143 1.052l-8 10.5a.75.75 0 0 1-1.127.075l-4.5-4.5a.75.75 0 0 1 1.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 0 1 1.05-.143Z"
+							clip-rule="evenodd"
+						/>
+					</svg>
+				{/if}
+			</button>
+
+			{#if agents.length > 0}
+				<div class="my-1 border-t border-theme"></div>
+				<div class="px-3 py-1.5 text-xs font-medium text-theme-muted uppercase tracking-wide">
+					Your Agents
+				</div>
+
+				<!-- Available agents -->
+				{#each agents as agent}
+					<button
+						type="button"
+						onclick={() => handleSelect(agent.id)}
+						class="flex w-full flex-col gap-0.5 px-3 py-2 text-left transition-colors hover:bg-theme-tertiary {currentAgentId === agent.id
+							? 'bg-theme-tertiary/50'
+							: ''}"
+					>
+						<div class="flex items-center gap-2">
+							<span
+								class="flex-1 text-sm font-medium {currentAgentId === agent.id
+									? 'text-theme-primary'
+									: 'text-theme-secondary'}"
+							>
+								{agent.name}
+							</span>
+							{#if currentAgentId === agent.id}
+								<svg
+									xmlns="http://www.w3.org/2000/svg"
+									viewBox="0 0 20 20"
+									fill="currentColor"
+									class="h-4 w-4 text-emerald-400"
+								>
+									<path
+										fill-rule="evenodd"
+										d="M16.704 4.153a.75.75 0 0 1 .143 1.052l-8 10.5a.75.75 0 0 1-1.127.075l-4.5-4.5a.75.75 0 0 1 1.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 0 1 1.05-.143Z"
+										clip-rule="evenodd"
+									/>
+								</svg>
+							{/if}
+						</div>
+						{#if agent.description}
+							<span class="line-clamp-1 text-xs text-theme-muted">{agent.description}</span>
+						{/if}
+						{#if agent.enabledToolNames.length > 0}
+							<span class="text-[10px] text-indigo-400">
+								{agent.enabledToolNames.length} tool{agent.enabledToolNames.length !== 1 ? 's' : ''}
+							</span>
+						{/if}
+					</button>
+				{/each}
+			{:else}
+				<div class="my-1 border-t border-theme"></div>
+				<div class="px-3 py-2 text-xs text-theme-muted">
+					No agents available. <a href="/settings?tab=agents" class="text-indigo-400 hover:underline"
+						>Create one</a
+					>
+				</div>
+			{/if}
+
+			<!-- Link to agents settings -->
+			<div class="mt-1 border-t border-theme"></div>
+			<a
+				href="/settings?tab=agents"
+				class="flex items-center gap-2 px-3 py-2 text-xs text-theme-muted hover:bg-theme-tertiary hover:text-theme-secondary"
+				onclick={closeDropdown}
+			>
+				<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="h-3.5 w-3.5">
+					<path fill-rule="evenodd" d="M8.34 1.804A1 1 0 0 1 9.32 1h1.36a1 1 0 0 1 .98.804l.295 1.473c.497.144.971.342 1.416.587l1.25-.834a1 1 0 0 1 1.262.125l.962.962a1 1 0 0 1 .125 1.262l-.834 1.25c.245.445.443.919.587 1.416l1.473.295a1 1 0 0 1 .804.98v1.36a1 1 0 0 1-.804.98l-1.473.295a6.95 6.95 0 0 1-.587 1.416l.834 1.25a1 1 0 0 1-.125 1.262l-.962.962a1 1 0 0 1-1.262.125l-1.25-.834a6.953 6.953 0 0 1-1.416.587l-.295 1.473a1 1 0 0 1-.98.804H9.32a1 1 0 0 1-.98-.804l-.295-1.473a6.957 6.957 0 0 1-1.416-.587l-1.25.834a1 1 0 0 1-1.262-.125l-.962-.962a1 1 0 0 1-.125-1.262l.834-1.25a6.957 6.957 0 0 1-.587-1.416l-1.473-.295A1 1 0 0 1 1 10.68V9.32a1 1 0 0 1 .804-.98l1.473-.295c.144-.497.342-.971.587-1.416l-.834-1.25a1 1 0 0 1 .125-1.262l.962-.962A1 1 0 0 1 5.38 3.03l1.25.834a6.957 6.957 0 0 1 1.416-.587l.294-1.473ZM13 10a3 3 0 1 1-6 0 3 3 0 0 1 6 0Z" clip-rule="evenodd" />
+				</svg>
+				Manage agents
+			</a>
+		</div>
+	{/if}
+</div>
diff --git a/frontend/src/lib/components/chat/ChatWindow.svelte b/frontend/src/lib/components/chat/ChatWindow.svelte
index b725c05..164c6fa 100644
--- a/frontend/src/lib/components/chat/ChatWindow.svelte
+++ b/frontend/src/lib/components/chat/ChatWindow.svelte
@@ -4,7 +4,7 @@
 	 * Handles sending messages, streaming responses, and tool execution
 	 */
 
-	import { chatState, modelsState, conversationsState, toolsState, promptsState, toastState } from '$lib/stores';
+	import { chatState, modelsState, conversationsState, toolsState, promptsState, toastState, agentsState } from '$lib/stores';
 	import { resolveSystemPrompt } from '$lib/services/prompt-resolution.js';
 	import { serverConversationsState } from '$lib/stores/server-conversations.svelte';
 	import { streamingMetricsState } from '$lib/stores/streaming-metrics.svelte';
@@ -34,6 +34,7 @@
 	import SummaryBanner from './SummaryBanner.svelte';
 	import StreamingStats from './StreamingStats.svelte';
 	import SystemPromptSelector from './SystemPromptSelector.svelte';
+	import AgentSelector from './AgentSelector.svelte';
 	import ModelParametersPanel from '$lib/components/settings/ModelParametersPanel.svelte';
 	import { settingsState } from '$lib/stores/settings.svelte';
 	import { buildProjectContext, formatProjectContextForPrompt, hasProjectContext } from '$lib/services/project-context.js';
@@ -89,6 +90,9 @@
 	// System prompt for new conversations (before a conversation is created)
 	let newChatPromptId = $state<string | null>(null);
 
+	// Agent for new conversations (before a conversation is created)
+	let newChatAgentId = $state<string | null>(null);
+
 	// File picker trigger function (bound from ChatInput -> FileUpload)
 	let triggerFilePicker: (() => void) | undefined = $state();
 
@@ -229,9 +233,18 @@
 
 	/**
 	 * Get tool definitions for the API call
+	 * If an agent is selected, only returns tools the agent has enabled
 	 */
 	function getToolsForApi(): OllamaToolDefinition[] | undefined {
 		if (!toolsState.toolsEnabled) return undefined;
+
+		// If an agent is selected, filter tools by agent's enabled list
+		if (currentAgent) {
+			const tools = toolsState.getToolDefinitionsForAgent(currentAgent.enabledToolNames);
+			return tools.length > 0 ? tools as OllamaToolDefinition[] : undefined;
+		}
+
+		// No agent - use all enabled tools
 		const tools = toolsState.getEnabledToolDefinitions();
 		return tools.length > 0 ? tools as OllamaToolDefinition[] : undefined;
 	}
@@ -239,6 +252,13 @@
 	// Derived: Check if there are any messages
 	const hasMessages = $derived(chatState.visibleMessages.length > 0);
 
+	// Derived: Current agent (from conversation or new chat selection)
+	const currentAgent = $derived.by(() => {
+		const agentId = mode === 'conversation' ? conversation?.agentId : newChatAgentId;
+		if (!agentId) return null;
+		return agentsState.get(agentId) ?? null;
+	});
+
 	// Update context manager when model changes
 	$effect(() => {
 		const model = modelsState.selectedId;
@@ -725,15 +745,18 @@
 			// Resolve system prompt using priority chain:
 			// 1. Per-conversation prompt
 			// 2. New chat selection
-			// 3. Model-prompt mapping
-			// 4. Model-embedded prompt (from Modelfile)
-			// 5. Capability-matched prompt
-			// 6. Global active prompt
-			// 7. None
+			// 3. Agent prompt (if agent selected)
+			// 4. Model-prompt mapping
+			// 5. Model-embedded prompt (from Modelfile)
+			// 6. Capability-matched prompt
+			// 7. Global active prompt
+			// 8. None
 			const resolvedPrompt = await resolveSystemPrompt(
 				model,
 				conversation?.systemPromptId,
-				newChatPromptId
+				newChatPromptId,
+				currentAgent?.promptId,
+				currentAgent?.name
 			);
 
 			if (resolvedPrompt.content) {
@@ -1281,6 +1304,19 @@
 							onSelect={(promptId) => (newChatPromptId = promptId)}
 						/>
 					{/if}
+
+					<!-- Agent selector -->
+					{#if mode === 'conversation' && conversation}
+						<AgentSelector
+							conversationId={conversation.id}
+							currentAgentId={conversation.agentId}
+						/>
+					{:else if mode === 'new'}
+						<AgentSelector
+							currentAgentId={newChatAgentId}
+							onSelect={(agentId) => (newChatAgentId = agentId)}
+						/>
+					{/if}
 				</div>
 
 				<!-- Right side: Attach files + Thinking mode toggle -->
diff --git a/frontend/src/lib/components/chat/SystemPromptSelector.svelte b/frontend/src/lib/components/chat/SystemPromptSelector.svelte
index be0b629..fd7afcd 100644
--- a/frontend/src/lib/components/chat/SystemPromptSelector.svelte
+++ b/frontend/src/lib/components/chat/SystemPromptSelector.svelte
@@ -211,10 +211,10 @@
 		</svg>
 	</button>
 
-	<!-- Dropdown menu -->
+	<!-- Dropdown menu (opens upward) -->
 	{#if isOpen}
 		<div
-			class="absolute left-0 top-full z-50 mt-1 w-72 rounded-lg border border-theme bg-theme-secondary py-1 shadow-xl"
+			class="absolute bottom-full left-0 z-50 mb-1 max-h-80 w-72 overflow-y-auto rounded-lg border border-theme bg-theme-secondary py-1 shadow-xl"
 		>
 			<!-- Model default section -->
 			<div class="px-3 py-1.5 text-xs font-medium text-theme-muted uppercase tracking-wide">
diff --git a/frontend/src/lib/components/settings/AgentsTab.svelte b/frontend/src/lib/components/settings/AgentsTab.svelte
new file mode 100644
index 0000000..940a15d
--- /dev/null
+++ b/frontend/src/lib/components/settings/AgentsTab.svelte
@@ -0,0 +1,500 @@
+<script lang="ts">
+	/**
+	 * AgentsTab - Agent management settings tab
+	 * CRUD operations for agents with prompt and tool configuration
+	 */
+	import { agentsState, promptsState, toolsState } from '$lib/stores';
+	import type { Agent } from '$lib/storage';
+	import { ConfirmDialog } from '$lib/components/shared';
+
+	let showEditor = $state(false);
+	let editingAgent = $state<Agent | null>(null);
+	let searchQuery = $state('');
+	let deleteConfirm = $state<{ show: boolean; agent: Agent | null }>({ show: false, agent: null });
+
+	// Form state
+	let formName = $state('');
+	let formDescription = $state('');
+	let formPromptId = $state<string | null>(null);
+	let formPreferredModel = $state<string | null>(null);
+	let formEnabledTools = $state<Set<string>>(new Set());
+
+	// Stats
+	const stats = $derived({
+		total: agentsState.agents.length
+	});
+
+	// Filtered agents based on search
+	const filteredAgents = $derived(
+		searchQuery.trim()
+			? agentsState.sortedAgents.filter(
+					(a) =>
+						a.name.toLowerCase().includes(searchQuery.toLowerCase()) ||
+						a.description.toLowerCase().includes(searchQuery.toLowerCase())
+				)
+			: agentsState.sortedAgents
+	);
+
+	// Available tools for selection
+	const availableTools = $derived(
+		toolsState.getAllToolsWithState().map((t) => ({
+			name: t.definition.function.name,
+			description: t.definition.function.description,
+			isBuiltin: t.isBuiltin
+		}))
+	);
+
+	function openCreateEditor(): void {
+		editingAgent = null;
+		formName = '';
+		formDescription = '';
+		formPromptId = null;
+		formPreferredModel = null;
+		formEnabledTools = new Set();
+		showEditor = true;
+	}
+
+	function openEditEditor(agent: Agent): void {
+		editingAgent = agent;
+		formName = agent.name;
+		formDescription = agent.description;
+		formPromptId = agent.promptId;
+		formPreferredModel = agent.preferredModel;
+		formEnabledTools = new Set(agent.enabledToolNames);
+		showEditor = true;
+	}
+
+	function closeEditor(): void {
+		showEditor = false;
+		editingAgent = null;
+	}
+
+	async function handleSave(): Promise<void> {
+		if (!formName.trim()) return;
+
+		const data = {
+			name: formName.trim(),
+			description: formDescription.trim(),
+			promptId: formPromptId,
+			preferredModel: formPreferredModel,
+			enabledToolNames: Array.from(formEnabledTools)
+		};
+
+		if (editingAgent) {
+			await agentsState.update(editingAgent.id, data);
+		} else {
+			await agentsState.add(data);
+		}
+
+		closeEditor();
+	}
+
+	function handleDelete(agent: Agent): void {
+		deleteConfirm = { show: true, agent };
+	}
+
+	async function confirmDelete(): Promise<void> {
+		if (deleteConfirm.agent) {
+			await agentsState.remove(deleteConfirm.agent.id);
+		}
+		deleteConfirm = { show: false, agent: null };
+	}
+
+	function toggleTool(toolName: string): void {
+		const newSet = new Set(formEnabledTools);
+		if (newSet.has(toolName)) {
+			newSet.delete(toolName);
+		} else {
+			newSet.add(toolName);
+		}
+		formEnabledTools = newSet;
+	}
+
+	function getPromptName(promptId: string | null): string {
+		if (!promptId) return 'No prompt';
+		const prompt = promptsState.get(promptId);
+		return prompt?.name ?? 'Unknown prompt';
+	}
+</script>
+
+<div>
+	<!-- Header -->
+	<div class="mb-6 flex items-center justify-between">
+		<div>
+			<h2 class="text-xl font-bold text-theme-primary">Agents</h2>
+			<p class="mt-1 text-sm text-theme-muted">
+				Create specialized agents with custom prompts and tool sets
+			</p>
+		</div>
+
+		<button
+			type="button"
+			onclick={openCreateEditor}
+			class="flex items-center gap-2 rounded-lg bg-violet-600 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-violet-700"
+		>
+			<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+				<path stroke-linecap="round" stroke-linejoin="round" d="M12 4v16m8-8H4" />
+			</svg>
+			Create Agent
+		</button>
+	</div>
+
+	<!-- Stats -->
+	<div class="mb-6 grid grid-cols-2 gap-4 sm:grid-cols-4">
+		<div class="rounded-lg border border-theme bg-theme-secondary p-4">
+			<p class="text-sm text-theme-muted">Total Agents</p>
+			<p class="mt-1 text-2xl font-semibold text-theme-primary">{stats.total}</p>
+		</div>
+	</div>
+
+	<!-- Search -->
+	{#if agentsState.agents.length > 0}
+		<div class="mb-6">
+			<div class="relative">
+				<svg
+					class="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-theme-muted"
+					fill="none"
+					viewBox="0 0 24 24"
+					stroke="currentColor"
+					stroke-width="2"
+				>
+					<path
+						stroke-linecap="round"
+						stroke-linejoin="round"
+						d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"
+					/>
+				</svg>
+				<input
+					type="text"
+					bind:value={searchQuery}
+					placeholder="Search agents..."
+					class="w-full rounded-lg border border-theme bg-theme-secondary py-2 pl-10 pr-4 text-sm text-theme-primary placeholder:text-theme-muted focus:border-violet-500 focus:outline-none focus:ring-1 focus:ring-violet-500"
+				/>
+				{#if searchQuery}
+					<button
+						type="button"
+						onclick={() => (searchQuery = '')}
+						class="absolute right-3 top-1/2 -translate-y-1/2 text-theme-muted hover:text-theme-primary"
+						aria-label="Clear search"
+					>
+						<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+							<path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
+						</svg>
+					</button>
+				{/if}
+			</div>
+		</div>
+	{/if}
+
+	<!-- Agents List -->
+	{#if filteredAgents.length === 0 && agentsState.agents.length === 0}
+		<div class="rounded-lg border border-dashed border-theme bg-theme-secondary/50 p-8 text-center">
+			<svg
+				class="mx-auto h-12 w-12 text-theme-muted"
+				fill="none"
+				viewBox="0 0 24 24"
+				stroke="currentColor"
+				stroke-width="1.5"
+			>
+				<path
+					stroke-linecap="round"
+					stroke-linejoin="round"
+					d="M15.75 6a3.75 3.75 0 1 1-7.5 0 3.75 3.75 0 0 1 7.5 0ZM4.501 20.118a7.5 7.5 0 0 1 14.998 0A17.933 17.933 0 0 1 12 21.75c-2.676 0-5.216-.584-7.499-1.632Z"
+				/>
+			</svg>
+			<h4 class="mt-4 text-sm font-medium text-theme-secondary">No agents yet</h4>
+			<p class="mt-1 text-sm text-theme-muted">
+				Create agents to combine prompts and tools for specialized tasks
+			</p>
+			<button
+				type="button"
+				onclick={openCreateEditor}
+				class="mt-4 inline-flex items-center gap-2 rounded-lg border border-violet-500 px-4 py-2 text-sm font-medium text-violet-400 transition-colors hover:bg-violet-900/30"
+			>
+				<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+					<path stroke-linecap="round" stroke-linejoin="round" d="M12 4v16m8-8H4" />
+				</svg>
+				Create Your First Agent
+			</button>
+		</div>
+	{:else if filteredAgents.length === 0}
+		<div class="rounded-lg border border-dashed border-theme bg-theme-secondary/50 p-8 text-center">
+			<p class="text-sm text-theme-muted">No agents match your search</p>
+		</div>
+	{:else}
+		<div class="space-y-3">
+			{#each filteredAgents as agent (agent.id)}
+				<div class="rounded-lg border border-theme bg-theme-secondary">
+					<div class="p-4">
+						<div class="flex items-start gap-4">
+							<!-- Agent Icon -->
+							<div
+								class="flex h-10 w-10 flex-shrink-0 items-center justify-center rounded-lg bg-violet-900/30 text-violet-400"
+							>
+								<svg class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+									<path
+										stroke-linecap="round"
+										stroke-linejoin="round"
+										d="M15.75 6a3.75 3.75 0 1 1-7.5 0 3.75 3.75 0 0 1 7.5 0ZM4.501 20.118a7.5 7.5 0 0 1 14.998 0A17.933 17.933 0 0 1 12 21.75c-2.676 0-5.216-.584-7.499-1.632Z"
+									/>
+								</svg>
+							</div>
+
+							<!-- Content -->
+							<div class="min-w-0 flex-1">
+								<div class="flex items-center gap-2">
+									<h4 class="font-semibold text-theme-primary">{agent.name}</h4>
+									{#if agent.promptId}
+										<span class="rounded-full bg-blue-900/40 px-2 py-0.5 text-xs font-medium text-blue-300">
+											{getPromptName(agent.promptId)}
+										</span>
+									{/if}
+									{#if agent.enabledToolNames.length > 0}
+										<span
+											class="rounded-full bg-emerald-900/40 px-2 py-0.5 text-xs font-medium text-emerald-300"
+										>
+											{agent.enabledToolNames.length} tools
+										</span>
+									{/if}
+								</div>
+
+								{#if agent.description}
+									<p class="mt-1 text-sm text-theme-muted line-clamp-2">
+										{agent.description}
+									</p>
+								{/if}
+							</div>
+
+							<!-- Actions -->
+							<div class="flex items-center gap-2">
+								<button
+									type="button"
+									onclick={() => openEditEditor(agent)}
+									class="rounded-lg p-2 text-theme-muted transition-colors hover:bg-theme-tertiary hover:text-theme-primary"
+									aria-label="Edit agent"
+								>
+									<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+										<path
+											stroke-linecap="round"
+											stroke-linejoin="round"
+											d="M16.862 4.487l1.687-1.688a1.875 1.875 0 112.652 2.652L10.582 16.07a4.5 4.5 0 01-1.897 1.13L6 18l.8-2.685a4.5 4.5 0 011.13-1.897l8.932-8.931zm0 0L19.5 7.125M18 14v4.75A2.25 2.25 0 0115.75 21H5.25A2.25 2.25 0 013 18.75V8.25A2.25 2.25 0 015.25 6H10"
+										/>
+									</svg>
+								</button>
+								<button
+									type="button"
+									onclick={() => handleDelete(agent)}
+									class="rounded-lg p-2 text-theme-muted transition-colors hover:bg-red-900/30 hover:text-red-400"
+									aria-label="Delete agent"
+								>
+									<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+										<path
+											stroke-linecap="round"
+											stroke-linejoin="round"
+											d="M14.74 9l-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 013.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 00-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 00-7.5 0"
+										/>
+									</svg>
+								</button>
+							</div>
+						</div>
+					</div>
+				</div>
+			{/each}
+		</div>
+	{/if}
+
+	<!-- Info Section -->
+	<section class="mt-8 rounded-lg border border-theme bg-gradient-to-br from-theme-secondary/80 to-theme-secondary/40 p-5">
+		<h4 class="flex items-center gap-2 text-sm font-semibold text-theme-primary">
+			<svg class="h-5 w-5 text-violet-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+				<path
+					stroke-linecap="round"
+					stroke-linejoin="round"
+					d="M9.663 17h4.673M12 3v1m6.364 1.636l-.707.707M21 12h-1M4 12H3m3.343-5.657l-.707-.707m2.828 9.9a5 5 0 117.072 0l-.548.547A3.374 3.374 0 0014 18.469V19a2 2 0 11-4 0v-.531c0-.895-.356-1.754-.988-2.386l-.548-.547z"
+				/>
+			</svg>
+			About Agents
+		</h4>
+		<p class="mt-3 text-sm leading-relaxed text-theme-muted">
+			Agents combine a system prompt with a specific set of tools. When you select an agent for a
+			chat, it will use the agent's prompt and only have access to the agent's allowed tools.
+		</p>
+		<div class="mt-4 grid gap-3 sm:grid-cols-2">
+			<div class="rounded-lg bg-theme-tertiary/50 p-3">
+				<div class="flex items-center gap-2 text-xs font-medium text-blue-400">
+					<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+						<path
+							stroke-linecap="round"
+							stroke-linejoin="round"
+							d="M7.5 8.25h9m-9 3H12m-9.75 1.51c0 1.6 1.123 2.994 2.707 3.227 1.129.166 2.27.293 3.423.379.35.026.67.21.865.501L12 21l2.755-4.133a1.14 1.14 0 0 1 .865-.501 48.172 48.172 0 0 0 3.423-.379c1.584-.233 2.707-1.626 2.707-3.228V6.741c0-1.602-1.123-2.995-2.707-3.228A48.394 48.394 0 0 0 12 3c-2.392 0-4.744.175-7.043.513C3.373 3.746 2.25 5.14 2.25 6.741v6.018Z"
+						/>
+					</svg>
+					System Prompt
+				</div>
+				<p class="mt-1 text-xs text-theme-muted">Defines the agent's personality and behavior</p>
+			</div>
+			<div class="rounded-lg bg-theme-tertiary/50 p-3">
+				<div class="flex items-center gap-2 text-xs font-medium text-emerald-400">
+					<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+						<path
+							stroke-linecap="round"
+							stroke-linejoin="round"
+							d="M11.42 15.17L17.25 21A2.652 2.652 0 0021 17.25l-5.877-5.877M11.42 15.17l2.496-3.03c.317-.384.74-.626 1.208-.766M11.42 15.17l-4.655 5.653a2.548 2.548 0 11-3.586-3.586l6.837-5.63m5.108-.233c.55-.164 1.163-.188 1.743-.14a4.5 4.5 0 004.486-6.336l-3.276 3.277a3.004 3.004 0 01-2.25-2.25l3.276-3.276a4.5 4.5 0 00-6.336 4.486c.091 1.076-.071 2.264-.904 2.95l-.102.085m-1.745 1.437L5.909 7.5H4.5L2.25 3.75l1.5-1.5L7.5 4.5v1.409l4.26 4.26m-1.745 1.437l1.745-1.437m6.615 8.206L15.75 15.75M4.867 19.125h.008v.008h-.008v-.008z"
+						/>
+					</svg>
+					Tool Access
+				</div>
+				<p class="mt-1 text-xs text-theme-muted">Restricts which tools the agent can use</p>
+			</div>
+		</div>
+	</section>
+</div>
+
+<!-- Editor Dialog -->
+{#if showEditor}
+	<div
+		class="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4"
+		role="dialog"
+		aria-modal="true"
+		aria-labelledby="agent-editor-title"
+	>
+		<div class="w-full max-w-2xl rounded-xl border border-theme bg-theme-primary shadow-2xl">
+			<!-- Header -->
+			<div class="flex items-center justify-between border-b border-theme px-6 py-4">
+				<h3 id="agent-editor-title" class="text-lg font-semibold text-theme-primary">
+					{editingAgent ? 'Edit Agent' : 'Create Agent'}
+				</h3>
+				<button
+					type="button"
+					onclick={closeEditor}
+					class="rounded p-1 text-theme-muted hover:bg-theme-tertiary hover:text-theme-primary"
+					aria-label="Close"
+				>
+					<svg class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+						<path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
+					</svg>
+				</button>
+			</div>
+
+			<!-- Form -->
+			<form
+				onsubmit={(e) => {
+					e.preventDefault();
+					handleSave();
+				}}
+				class="max-h-[70vh] overflow-y-auto p-6"
+			>
+				<!-- Name -->
+				<div class="mb-4">
+					<label for="agent-name" class="mb-1 block text-sm font-medium text-theme-primary">
+						Name <span class="text-red-400">*</span>
+					</label>
+					<input
+						id="agent-name"
+						type="text"
+						bind:value={formName}
+						placeholder="e.g., Research Assistant"
+						required
+						class="w-full rounded-lg border border-theme bg-theme-secondary px-3 py-2 text-sm text-theme-primary placeholder:text-theme-muted focus:border-violet-500 focus:outline-none focus:ring-1 focus:ring-violet-500"
+					/>
+				</div>
+
+				<!-- Description -->
+				<div class="mb-4">
+					<label for="agent-description" class="mb-1 block text-sm font-medium text-theme-primary">
+						Description
+					</label>
+					<textarea
+						id="agent-description"
+						bind:value={formDescription}
+						placeholder="Describe what this agent does..."
+						rows={3}
+						class="w-full rounded-lg border border-theme bg-theme-secondary px-3 py-2 text-sm text-theme-primary placeholder:text-theme-muted focus:border-violet-500 focus:outline-none focus:ring-1 focus:ring-violet-500"
+					></textarea>
+				</div>
+
+				<!-- Prompt Selection -->
+				<div class="mb-4">
+					<label for="agent-prompt" class="mb-1 block text-sm font-medium text-theme-primary">
+						System Prompt
+					</label>
+					<select
+						id="agent-prompt"
+						bind:value={formPromptId}
+						class="w-full rounded-lg border border-theme bg-theme-secondary px-3 py-2 text-sm text-theme-primary focus:border-violet-500 focus:outline-none focus:ring-1 focus:ring-violet-500"
+					>
+						<option value={null}>No specific prompt (use defaults)</option>
+						{#each promptsState.prompts as prompt (prompt.id)}
+							<option value={prompt.id}>{prompt.name}</option>
+						{/each}
+					</select>
+					<p class="mt-1 text-xs text-theme-muted">
+						Select a prompt from your library to use with this agent
+					</p>
+				</div>
+
+				<!-- Tools Selection -->
+				<div class="mb-4">
+					<label class="mb-2 block text-sm font-medium text-theme-primary"> Allowed Tools </label>
+					<div class="max-h-48 overflow-y-auto rounded-lg border border-theme bg-theme-secondary p-2">
+						{#if availableTools.length === 0}
+							<p class="p-2 text-sm text-theme-muted">No tools available</p>
+						{:else}
+							<div class="space-y-1">
+								{#each availableTools as tool (tool.name)}
+									<label
+										class="flex cursor-pointer items-center gap-2 rounded p-2 hover:bg-theme-tertiary"
+									>
+										<input
+											type="checkbox"
+											checked={formEnabledTools.has(tool.name)}
+											onchange={() => toggleTool(tool.name)}
+											class="h-4 w-4 rounded border-gray-600 bg-theme-tertiary text-violet-500 focus:ring-violet-500"
+										/>
+										<span class="text-sm text-theme-primary">{tool.name}</span>
+										{#if tool.isBuiltin}
+											<span class="text-xs text-blue-400">(built-in)</span>
+										{/if}
+									</label>
+								{/each}
+							</div>
+						{/if}
+					</div>
+					<p class="mt-1 text-xs text-theme-muted">
+						{formEnabledTools.size === 0
+							? 'All tools will be available (no restrictions)'
+							: `${formEnabledTools.size} tool(s) selected`}
+					</p>
+				</div>
+
+				<!-- Actions -->
+				<div class="mt-6 flex justify-end gap-3">
+					<button
+						type="button"
+						onclick={closeEditor}
+						class="rounded-lg border border-theme px-4 py-2 text-sm font-medium text-theme-secondary transition-colors hover:bg-theme-tertiary"
+					>
+						Cancel
+					</button>
+					<button
+						type="submit"
+						disabled={!formName.trim()}
+						class="rounded-lg bg-violet-600 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-violet-700 disabled:cursor-not-allowed disabled:opacity-50"
+					>
+						{editingAgent ? 'Save Changes' : 'Create Agent'}
+					</button>
+				</div>
+			</form>
+		</div>
+	</div>
+{/if}
+
+<ConfirmDialog
+	isOpen={deleteConfirm.show}
+	title="Delete Agent"
+	message={`Delete "${deleteConfirm.agent?.name}"? This cannot be undone.`}
+	confirmText="Delete"
+	variant="danger"
+	onConfirm={confirmDelete}
+	onCancel={() => (deleteConfirm = { show: false, agent: null })}
+/>
diff --git a/frontend/src/lib/components/settings/SettingsTabs.svelte b/frontend/src/lib/components/settings/SettingsTabs.svelte
index 9a563c4..ba9c2f9 100644
--- a/frontend/src/lib/components/settings/SettingsTabs.svelte
+++ b/frontend/src/lib/components/settings/SettingsTabs.svelte
@@ -2,7 +2,7 @@
 	/**
 	 * SettingsTabs - Horizontal tab navigation for Settings Hub
 	 */
-	export type SettingsTab = 'general' | 'models' | 'prompts' | 'tools' | 'knowledge' | 'memory';
+	export type SettingsTab = 'general' | 'models' | 'prompts' | 'tools' | 'agents' | 'knowledge' | 'memory';
 </script>
 
 <script lang="ts">
@@ -19,6 +19,7 @@
 		{ id: 'models', label: 'Models', icon: 'cpu' },
 		{ id: 'prompts', label: 'Prompts', icon: 'message' },
 		{ id: 'tools', label: 'Tools', icon: 'wrench' },
+		{ id: 'agents', label: 'Agents', icon: 'robot' },
 		{ id: 'knowledge', label: 'Knowledge', icon: 'book' },
 		{ id: 'memory', label: 'Memory', icon: 'brain' }
 	];
@@ -59,6 +60,10 @@
 				<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
 					<path stroke-linecap="round" stroke-linejoin="round" d="M12 6.042A8.967 8.967 0 0 0 6 3.75c-1.052 0-2.062.18-3 .512v14.25A8.987 8.987 0 0 1 6 18c2.305 0 4.408.867 6 2.292m0-14.25a8.966 8.966 0 0 1 6-2.292c1.052 0 2.062.18 3 .512v14.25A8.987 8.987 0 0 0 18 18a8.967 8.967 0 0 0-6 2.292m0-14.25v14.25" />
 				</svg>
+			{:else if tab.icon === 'robot'}
+				<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+					<path stroke-linecap="round" stroke-linejoin="round" d="M15.75 6a3.75 3.75 0 1 1-7.5 0 3.75 3.75 0 0 1 7.5 0ZM4.501 20.118a7.5 7.5 0 0 1 14.998 0A17.933 17.933 0 0 1 12 21.75c-2.676 0-5.216-.584-7.499-1.632Z" />
+				</svg>
 			{:else if tab.icon === 'brain'}
 				<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
 					<path stroke-linecap="round" stroke-linejoin="round" d="M9.813 15.904 9 18.75l-.813-2.846a4.5 4.5 0 0 0-3.09-3.09L2.25 12l2.846-.813a4.5 4.5 0 0 0 3.09-3.09L9 5.25l.813 2.846a4.5 4.5 0 0 0 3.09 3.09L15.75 12l-2.846.813a4.5 4.5 0 0 0-3.09 3.09ZM18.259 8.715 18 9.75l-.259-1.035a3.375 3.375 0 0 0-2.455-2.456L14.25 6l1.036-.259a3.375 3.375 0 0 0 2.455-2.456L18 2.25l.259 1.035a3.375 3.375 0 0 0 2.456 2.456L21.75 6l-1.035.259a3.375 3.375 0 0 0-2.456 2.456ZM16.894 20.567 16.5 21.75l-.394-1.183a2.25 2.25 0 0 0-1.423-1.423L13.5 18.75l1.183-.394a2.25 2.25 0 0 0 1.423-1.423l.394-1.183.394 1.183a2.25 2.25 0 0 0 1.423 1.423l1.183.394-1.183.394a2.25 2.25 0 0 0-1.423 1.423Z" />
diff --git a/frontend/src/lib/components/settings/index.ts b/frontend/src/lib/components/settings/index.ts
index 0d2fe54..bb998fe 100644
--- a/frontend/src/lib/components/settings/index.ts
+++ b/frontend/src/lib/components/settings/index.ts
@@ -6,6 +6,7 @@ export { default as GeneralTab } from './GeneralTab.svelte';
 export { default as ModelsTab } from './ModelsTab.svelte';
 export { default as PromptsTab } from './PromptsTab.svelte';
 export { default as ToolsTab } from './ToolsTab.svelte';
+export { default as AgentsTab } from './AgentsTab.svelte';
 export { default as KnowledgeTab } from './KnowledgeTab.svelte';
 export { default as MemoryTab } from './MemoryTab.svelte';
 export { default as ModelParametersPanel } from './ModelParametersPanel.svelte';
diff --git a/frontend/src/lib/services/prompt-resolution.test.ts b/frontend/src/lib/services/prompt-resolution.test.ts
index 3500373..b89b724 100644
--- a/frontend/src/lib/services/prompt-resolution.test.ts
+++ b/frontend/src/lib/services/prompt-resolution.test.ts
@@ -11,6 +11,7 @@ describe('getPromptSourceLabel', () => {
 	const testCases: Array<{ source: PromptSource; expected: string }> = [
 		{ source: 'per-conversation', expected: 'Custom (this chat)' },
 		{ source: 'new-chat-selection', expected: 'Selected prompt' },
+		{ source: 'agent', expected: 'Agent prompt' },
 		{ source: 'model-mapping', expected: 'Model default' },
 		{ source: 'model-embedded', expected: 'Model built-in' },
 		{ source: 'capability-match', expected: 'Auto-matched' },
@@ -29,6 +30,7 @@ describe('getPromptSourceLabel', () => {
 		const allSources: PromptSource[] = [
 			'per-conversation',
 			'new-chat-selection',
+			'agent',
 			'model-mapping',
 			'model-embedded',
 			'capability-match',
diff --git a/frontend/src/lib/services/prompt-resolution.ts b/frontend/src/lib/services/prompt-resolution.ts
index 4f83e3c..997f141 100644
--- a/frontend/src/lib/services/prompt-resolution.ts
+++ b/frontend/src/lib/services/prompt-resolution.ts
@@ -20,6 +20,7 @@ import type { OllamaCapability } from '$lib/ollama/types.js';
 export type PromptSource =
 	| 'per-conversation'
 	| 'new-chat-selection'
+	| 'agent'
 	| 'model-mapping'
 	| 'model-embedded'
 	| 'capability-match'
@@ -72,21 +73,26 @@ function findCapabilityMatchedPrompt(
  * Priority order:
  * 1. Per-conversation prompt (explicit user override)
  * 2. New chat prompt selection (before conversation exists)
- * 3. Model-prompt mapping (user configured default for model)
- * 4. Model-embedded prompt (from Ollama Modelfile)
- * 5. Capability-matched prompt
- * 6. Global active prompt
- * 7. No prompt
+ * 3. Agent prompt (if agent is specified and has a promptId)
+ * 4. Model-prompt mapping (user configured default for model)
+ * 5. Model-embedded prompt (from Ollama Modelfile)
+ * 6. Capability-matched prompt
+ * 7. Global active prompt
+ * 8. No prompt
  *
  * @param modelName - Ollama model name (e.g., "llama3.2:8b")
  * @param conversationPromptId - Per-conversation prompt ID (if set)
  * @param newChatPromptId - New chat selection (before conversation created)
+ * @param agentPromptId - Agent's prompt ID (if agent is selected)
+ * @param agentName - Agent's name for display (optional)
  * @returns Resolved prompt with content and source
  */
 export async function resolveSystemPrompt(
 	modelName: string,
 	conversationPromptId?: string | null,
-	newChatPromptId?: string | null
+	newChatPromptId?: string | null,
+	agentPromptId?: string | null,
+	agentName?: string
 ): Promise<ResolvedPrompt> {
 	// Ensure stores are loaded
 	await promptsState.ready();
@@ -116,7 +122,19 @@ export async function resolveSystemPrompt(
 		}
 	}
 
-	// 3. User-configured model-prompt mapping
+	// 3. Agent prompt (if agent is specified and has a promptId)
+	if (agentPromptId) {
+		const prompt = promptsState.get(agentPromptId);
+		if (prompt) {
+			return {
+				content: prompt.content,
+				source: 'agent',
+				promptName: agentName ? `${agentName}: ${prompt.name}` : prompt.name
+			};
+		}
+	}
+
+	// 4. User-configured model-prompt mapping
 	const mappedPromptId = modelPromptMappingsState.getMapping(modelName);
 	if (mappedPromptId) {
 		const prompt = promptsState.get(mappedPromptId);
@@ -129,7 +147,7 @@ export async function resolveSystemPrompt(
 		}
 	}
 
-	// 4. Model-embedded prompt (from Ollama Modelfile SYSTEM directive)
+	// 5. Model-embedded prompt (from Ollama Modelfile SYSTEM directive)
 	const modelInfo = await modelInfoService.getModelInfo(modelName);
 	if (modelInfo.systemPrompt) {
 		return {
@@ -139,7 +157,7 @@ export async function resolveSystemPrompt(
 		};
 	}
 
-	// 5. Capability-matched prompt
+	// 6. Capability-matched prompt
 	if (modelInfo.capabilities.length > 0) {
 		const capabilityMatch = findCapabilityMatchedPrompt(modelInfo.capabilities, promptsState.prompts);
 		if (capabilityMatch) {
@@ -152,7 +170,7 @@ export async function resolveSystemPrompt(
 		}
 	}
 
-	// 6. Global active prompt
+	// 7. Global active prompt
 	const activePrompt = promptsState.activePrompt;
 	if (activePrompt) {
 		return {
@@ -162,7 +180,7 @@ export async function resolveSystemPrompt(
 		};
 	}
 
-	// 7. No prompt
+	// 8. No prompt
 	return {
 		content: '',
 		source: 'none'
@@ -181,6 +199,8 @@ export function getPromptSourceLabel(source: PromptSource): string {
 			return 'Custom (this chat)';
 		case 'new-chat-selection':
 			return 'Selected prompt';
+		case 'agent':
+			return 'Agent prompt';
 		case 'model-mapping':
 			return 'Model default';
 		case 'model-embedded':
diff --git a/frontend/src/lib/storage/agents.test.ts b/frontend/src/lib/storage/agents.test.ts
new file mode 100644
index 0000000..e20ec67
--- /dev/null
+++ b/frontend/src/lib/storage/agents.test.ts
@@ -0,0 +1,366 @@
+/**
+ * Agents storage layer tests
+ *
+ * Tests CRUD operations for agents and project-agent relationships.
+ * Uses fake-indexeddb for in-memory IndexedDB testing.
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import 'fake-indexeddb/auto';
+import { db, generateId } from './db.js';
+import {
+	createAgent,
+	getAllAgents,
+	getAgent,
+	updateAgent,
+	deleteAgent,
+	assignAgentToProject,
+	removeAgentFromProject,
+	getAgentsForProject
+} from './agents.js';
+
+describe('agents storage', () => {
+	// Reset database before each test
+	beforeEach(async () => {
+		// Clear all agent-related tables
+		await db.agents.clear();
+		await db.projectAgents.clear();
+	});
+
+	afterEach(async () => {
+		await db.agents.clear();
+		await db.projectAgents.clear();
+	});
+
+	describe('createAgent', () => {
+		it('creates agent with required fields', async () => {
+			const result = await createAgent({
+				name: 'Test Agent',
+				description: 'A test agent'
+			});
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.name).toBe('Test Agent');
+				expect(result.data.description).toBe('A test agent');
+			}
+		});
+
+		it('generates unique id', async () => {
+			const result1 = await createAgent({ name: 'Agent 1', description: '' });
+			const result2 = await createAgent({ name: 'Agent 2', description: '' });
+
+			expect(result1.success).toBe(true);
+			expect(result2.success).toBe(true);
+			if (result1.success && result2.success) {
+				expect(result1.data.id).not.toBe(result2.data.id);
+			}
+		});
+
+		it('sets createdAt and updatedAt timestamps', async () => {
+			const before = Date.now();
+			const result = await createAgent({ name: 'Agent', description: '' });
+			const after = Date.now();
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.createdAt.getTime()).toBeGreaterThanOrEqual(before);
+				expect(result.data.createdAt.getTime()).toBeLessThanOrEqual(after);
+				expect(result.data.updatedAt.getTime()).toBe(result.data.createdAt.getTime());
+			}
+		});
+
+		it('stores optional promptId', async () => {
+			const promptId = generateId();
+			const result = await createAgent({
+				name: 'Agent with Prompt',
+				description: '',
+				promptId
+			});
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.promptId).toBe(promptId);
+			}
+		});
+
+		it('stores enabledToolNames array', async () => {
+			const tools = ['fetch_url', 'web_search', 'calculate'];
+			const result = await createAgent({
+				name: 'Agent with Tools',
+				description: '',
+				enabledToolNames: tools
+			});
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.enabledToolNames).toEqual(tools);
+			}
+		});
+
+		it('stores optional preferredModel', async () => {
+			const result = await createAgent({
+				name: 'Agent with Model',
+				description: '',
+				preferredModel: 'llama3.2:8b'
+			});
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.preferredModel).toBe('llama3.2:8b');
+			}
+		});
+
+		it('defaults optional fields appropriately', async () => {
+			const result = await createAgent({
+				name: 'Minimal Agent',
+				description: 'Just the basics'
+			});
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.promptId).toBeNull();
+				expect(result.data.enabledToolNames).toEqual([]);
+				expect(result.data.preferredModel).toBeNull();
+			}
+		});
+	});
+
+	describe('getAllAgents', () => {
+		it('returns empty array when no agents', async () => {
+			const result = await getAllAgents();
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data).toEqual([]);
+			}
+		});
+
+		it('returns all agents sorted by name', async () => {
+			await createAgent({ name: 'Charlie', description: '' });
+			await createAgent({ name: 'Alice', description: '' });
+			await createAgent({ name: 'Bob', description: '' });
+
+			const result = await getAllAgents();
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.length).toBe(3);
+				expect(result.data[0].name).toBe('Alice');
+				expect(result.data[1].name).toBe('Bob');
+				expect(result.data[2].name).toBe('Charlie');
+			}
+		});
+	});
+
+	describe('getAgent', () => {
+		it('returns agent by id', async () => {
+			const createResult = await createAgent({ name: 'Test Agent', description: 'desc' });
+			expect(createResult.success).toBe(true);
+			if (!createResult.success) return;
+
+			const result = await getAgent(createResult.data.id);
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data?.name).toBe('Test Agent');
+				expect(result.data?.description).toBe('desc');
+			}
+		});
+
+		it('returns null for non-existent id', async () => {
+			const result = await getAgent('non-existent-id');
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data).toBeNull();
+			}
+		});
+	});
+
+	describe('updateAgent', () => {
+		it('updates name', async () => {
+			const createResult = await createAgent({ name: 'Original', description: '' });
+			expect(createResult.success).toBe(true);
+			if (!createResult.success) return;
+
+			const result = await updateAgent(createResult.data.id, { name: 'Updated' });
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.name).toBe('Updated');
+			}
+		});
+
+		it('updates enabledToolNames', async () => {
+			const createResult = await createAgent({
+				name: 'Agent',
+				description: '',
+				enabledToolNames: ['tool1']
+			});
+			expect(createResult.success).toBe(true);
+			if (!createResult.success) return;
+
+			const result = await updateAgent(createResult.data.id, {
+				enabledToolNames: ['tool1', 'tool2', 'tool3']
+			});
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.enabledToolNames).toEqual(['tool1', 'tool2', 'tool3']);
+			}
+		});
+
+		it('updates updatedAt timestamp', async () => {
+			const createResult = await createAgent({ name: 'Agent', description: '' });
+			expect(createResult.success).toBe(true);
+			if (!createResult.success) return;
+
+			const originalUpdatedAt = createResult.data.updatedAt.getTime();
+
+			// Small delay to ensure timestamp differs
+			await new Promise((r) => setTimeout(r, 10));
+
+			const result = await updateAgent(createResult.data.id, { description: 'new description' });
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.updatedAt.getTime()).toBeGreaterThan(originalUpdatedAt);
+			}
+		});
+
+		it('returns error for non-existent agent', async () => {
+			const result = await updateAgent('non-existent-id', { name: 'Updated' });
+
+			expect(result.success).toBe(false);
+			if (!result.success) {
+				expect(result.error).toContain('not found');
+			}
+		});
+	});
+
+	describe('deleteAgent', () => {
+		it('removes agent from database', async () => {
+			const createResult = await createAgent({ name: 'To Delete', description: '' });
+			expect(createResult.success).toBe(true);
+			if (!createResult.success) return;
+
+			const deleteResult = await deleteAgent(createResult.data.id);
+			expect(deleteResult.success).toBe(true);
+
+			const getResult = await getAgent(createResult.data.id);
+			expect(getResult.success).toBe(true);
+			if (getResult.success) {
+				expect(getResult.data).toBeNull();
+			}
+		});
+
+		it('removes project-agent associations', async () => {
+			const createResult = await createAgent({ name: 'Agent', description: '' });
+			expect(createResult.success).toBe(true);
+			if (!createResult.success) return;
+
+			const projectId = generateId();
+			await assignAgentToProject(createResult.data.id, projectId);
+
+			// Verify assignment exists
+			let agents = await getAgentsForProject(projectId);
+			expect(agents.success).toBe(true);
+			if (agents.success) {
+				expect(agents.data.length).toBe(1);
+			}
+
+			// Delete agent
+			await deleteAgent(createResult.data.id);
+
+			// Verify association removed
+			agents = await getAgentsForProject(projectId);
+			expect(agents.success).toBe(true);
+			if (agents.success) {
+				expect(agents.data.length).toBe(0);
+			}
+		});
+	});
+
+	describe('project-agent relationships', () => {
+		it('assigns agent to project', async () => {
+			const agentResult = await createAgent({ name: 'Agent', description: '' });
+			expect(agentResult.success).toBe(true);
+			if (!agentResult.success) return;
+
+			const projectId = generateId();
+			const assignResult = await assignAgentToProject(agentResult.data.id, projectId);
+
+			expect(assignResult.success).toBe(true);
+		});
+
+		it('removes agent from project', async () => {
+			const agentResult = await createAgent({ name: 'Agent', description: '' });
+			expect(agentResult.success).toBe(true);
+			if (!agentResult.success) return;
+
+			const projectId = generateId();
+			await assignAgentToProject(agentResult.data.id, projectId);
+
+			const removeResult = await removeAgentFromProject(agentResult.data.id, projectId);
+			expect(removeResult.success).toBe(true);
+
+			const agents = await getAgentsForProject(projectId);
+			expect(agents.success).toBe(true);
+			if (agents.success) {
+				expect(agents.data.length).toBe(0);
+			}
+		});
+
+		it('gets agents for project', async () => {
+			const agent1 = await createAgent({ name: 'Agent 1', description: '' });
+			const agent2 = await createAgent({ name: 'Agent 2', description: '' });
+			const agent3 = await createAgent({ name: 'Agent 3', description: '' });
+			expect(agent1.success && agent2.success && agent3.success).toBe(true);
+			if (!agent1.success || !agent2.success || !agent3.success) return;
+
+			const projectId = generateId();
+			const otherProjectId = generateId();
+
+			await assignAgentToProject(agent1.data.id, projectId);
+			await assignAgentToProject(agent2.data.id, projectId);
+			await assignAgentToProject(agent3.data.id, otherProjectId);
+
+			const result = await getAgentsForProject(projectId);
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data.length).toBe(2);
+				const names = result.data.map((a) => a.name).sort();
+				expect(names).toEqual(['Agent 1', 'Agent 2']);
+			}
+		});
+
+		it('prevents duplicate assignments', async () => {
+			const agentResult = await createAgent({ name: 'Agent', description: '' });
+			expect(agentResult.success).toBe(true);
+			if (!agentResult.success) return;
+
+			const projectId = generateId();
+			await assignAgentToProject(agentResult.data.id, projectId);
+			await assignAgentToProject(agentResult.data.id, projectId); // Duplicate
+
+			const agents = await getAgentsForProject(projectId);
+			expect(agents.success).toBe(true);
+			if (agents.success) {
+				// Should still be only one assignment
+				expect(agents.data.length).toBe(1);
+			}
+		});
+
+		it('returns empty array for project with no agents', async () => {
+			const projectId = generateId();
+			const result = await getAgentsForProject(projectId);
+
+			expect(result.success).toBe(true);
+			if (result.success) {
+				expect(result.data).toEqual([]);
+			}
+		});
+	});
+});
diff --git a/frontend/src/lib/storage/agents.ts b/frontend/src/lib/storage/agents.ts
new file mode 100644
index 0000000..cf15893
--- /dev/null
+++ b/frontend/src/lib/storage/agents.ts
@@ -0,0 +1,220 @@
+/**
+ * Agents storage operations
+ * CRUD operations for agents and project-agent relationships
+ */
+
+import { db, generateId, withErrorHandling } from './db.js';
+import type { StoredAgent, StoredProjectAgent, StorageResult } from './db.js';
+
+// ============================================================================
+// Types
+// ============================================================================
+
+/**
+ * Agent for UI display (with Date objects)
+ */
+export interface Agent {
+	id: string;
+	name: string;
+	description: string;
+	promptId: string | null;
+	enabledToolNames: string[];
+	preferredModel: string | null;
+	createdAt: Date;
+	updatedAt: Date;
+}
+
+export interface CreateAgentData {
+	name: string;
+	description: string;
+	promptId?: string | null;
+	enabledToolNames?: string[];
+	preferredModel?: string | null;
+}
+
+export interface UpdateAgentData {
+	name?: string;
+	description?: string;
+	promptId?: string | null;
+	enabledToolNames?: string[];
+	preferredModel?: string | null;
+}
+
+// ============================================================================
+// Converters
+// ============================================================================
+
+function toDomainAgent(stored: StoredAgent): Agent {
+	return {
+		id: stored.id,
+		name: stored.name,
+		description: stored.description,
+		promptId: stored.promptId,
+		enabledToolNames: stored.enabledToolNames,
+		preferredModel: stored.preferredModel,
+		createdAt: new Date(stored.createdAt),
+		updatedAt: new Date(stored.updatedAt)
+	};
+}
+
+// ============================================================================
+// Agent CRUD
+// ============================================================================
+
+/**
+ * Get all agents, sorted by name
+ */
+export async function getAllAgents(): Promise<StorageResult<Agent[]>> {
+	return withErrorHandling(async () => {
+		const all = await db.agents.toArray();
+		const sorted = all.sort((a, b) => a.name.localeCompare(b.name));
+		return sorted.map(toDomainAgent);
+	});
+}
+
+/**
+ * Get a single agent by ID
+ */
+export async function getAgent(id: string): Promise<StorageResult<Agent | null>> {
+	return withErrorHandling(async () => {
+		const stored = await db.agents.get(id);
+		return stored ? toDomainAgent(stored) : null;
+	});
+}
+
+/**
+ * Create a new agent
+ */
+export async function createAgent(data: CreateAgentData): Promise<StorageResult<Agent>> {
+	return withErrorHandling(async () => {
+		const now = Date.now();
+		const stored: StoredAgent = {
+			id: generateId(),
+			name: data.name,
+			description: data.description,
+			promptId: data.promptId ?? null,
+			enabledToolNames: data.enabledToolNames ?? [],
+			preferredModel: data.preferredModel ?? null,
+			createdAt: now,
+			updatedAt: now
+		};
+
+		await db.agents.add(stored);
+		return toDomainAgent(stored);
+	});
+}
+
+/**
+ * Update an existing agent
+ */
+export async function updateAgent(
+	id: string,
+	updates: UpdateAgentData
+): Promise<StorageResult<Agent>> {
+	return withErrorHandling(async () => {
+		const existing = await db.agents.get(id);
+		if (!existing) {
+			throw new Error(`Agent not found: ${id}`);
+		}
+
+		const updated: StoredAgent = {
+			...existing,
+			...updates,
+			updatedAt: Date.now()
+		};
+
+		await db.agents.put(updated);
+		return toDomainAgent(updated);
+	});
+}
+
+/**
+ * Delete an agent and all associated project assignments
+ */
+export async function deleteAgent(id: string): Promise<StorageResult<void>> {
+	return withErrorHandling(async () => {
+		await db.transaction('rw', [db.agents, db.projectAgents], async () => {
+			// Remove all project-agent associations
+			await db.projectAgents.where('agentId').equals(id).delete();
+			// Delete the agent itself
+			await db.agents.delete(id);
+		});
+	});
+}
+
+// ============================================================================
+// Project-Agent Relationships
+// ============================================================================
+
+/**
+ * Assign an agent to a project (adds to roster)
+ * Idempotent: does nothing if assignment already exists
+ */
+export async function assignAgentToProject(
+	agentId: string,
+	projectId: string
+): Promise<StorageResult<void>> {
+	return withErrorHandling(async () => {
+		// Check if assignment already exists
+		const existing = await db.projectAgents
+			.where('[projectId+agentId]')
+			.equals([projectId, agentId])
+			.first();
+
+		if (existing) {
+			return; // Already assigned, do nothing
+		}
+
+		const assignment: StoredProjectAgent = {
+			id: generateId(),
+			projectId,
+			agentId,
+			createdAt: Date.now()
+		};
+
+		await db.projectAgents.add(assignment);
+	});
+}
+
+/**
+ * Remove an agent from a project roster
+ */
+export async function removeAgentFromProject(
+	agentId: string,
+	projectId: string
+): Promise<StorageResult<void>> {
+	return withErrorHandling(async () => {
+		await db.projectAgents
+			.where('[projectId+agentId]')
+			.equals([projectId, agentId])
+			.delete();
+	});
+}
+
+/**
+ * Get all agents assigned to a project (sorted by name)
+ */
+export async function getAgentsForProject(projectId: string): Promise<StorageResult<Agent[]>> {
+	return withErrorHandling(async () => {
+		const assignments = await db.projectAgents.where('projectId').equals(projectId).toArray();
+		const agentIds = assignments.map((a) => a.agentId);
+
+		if (agentIds.length === 0) {
+			return [];
+		}
+
+		const agents = await db.agents.where('id').anyOf(agentIds).toArray();
+		const sorted = agents.sort((a, b) => a.name.localeCompare(b.name));
+		return sorted.map(toDomainAgent);
+	});
+}
+
+/**
+ * Get all project IDs that an agent is assigned to
+ */
+export async function getProjectsForAgent(agentId: string): Promise<StorageResult<string[]>> {
+	return withErrorHandling(async () => {
+		const assignments = await db.projectAgents.where('agentId').equals(agentId).toArray();
+		return assignments.map((a) => a.projectId);
+	});
+}
diff --git a/frontend/src/lib/storage/conversations.ts b/frontend/src/lib/storage/conversations.ts
index dfec666..08f290a 100644
--- a/frontend/src/lib/storage/conversations.ts
+++ b/frontend/src/lib/storage/conversations.ts
@@ -23,6 +23,7 @@ function toDomainConversation(stored: StoredConversation): Conversation {
 		messageCount: stored.messageCount,
 		systemPromptId: stored.systemPromptId ?? null,
 		projectId: stored.projectId ?? null,
+		agentId: stored.agentId ?? null,
 		summary: stored.summary ?? null,
 		summaryUpdatedAt: stored.summaryUpdatedAt ? new Date(stored.summaryUpdatedAt) : null
 	};
@@ -296,6 +297,16 @@ export async function updateSystemPrompt(
 	return updateConversation(conversationId, { systemPromptId });
 }
 
+/**
+ * Update the agent for a conversation
+ */
+export async function updateAgentId(
+	conversationId: string,
+	agentId: string | null
+): Promise<StorageResult<Conversation>> {
+	return updateConversation(conversationId, { agentId });
+}
+
 /**
  * Search conversations by title
  */
diff --git a/frontend/src/lib/storage/db.ts b/frontend/src/lib/storage/db.ts
index da9cc09..aba8002 100644
--- a/frontend/src/lib/storage/db.ts
+++ b/frontend/src/lib/storage/db.ts
@@ -23,6 +23,8 @@ export interface StoredConversation {
 	systemPromptId?: string | null;
 	/** Optional project ID this conversation belongs to */
 	projectId?: string | null;
+	/** Optional agent ID for this conversation (determines prompt and tools) */
+	agentId?: string | null;
 	/** Auto-generated conversation summary for cross-chat context */
 	summary?: string | null;
 	/** Timestamp when summary was last updated */
@@ -46,6 +48,8 @@ export interface ConversationRecord {
 	systemPromptId?: string | null;
 	/** Optional project ID this conversation belongs to */
 	projectId?: string | null;
+	/** Optional agent ID for this conversation (determines prompt and tools) */
+	agentId?: string | null;
 	/** Auto-generated conversation summary for cross-chat context */
 	summary?: string | null;
 	/** Timestamp when summary was last updated */
@@ -266,6 +270,39 @@ export interface StoredChatChunk {
 	createdAt: number;
 }
 
+// ============================================================================
+// Agent-related interfaces (v7)
+// ============================================================================
+
+/**
+ * Stored agent configuration
+ * Agents combine identity, system prompt, and tool subset
+ */
+export interface StoredAgent {
+	id: string;
+	name: string;
+	description: string;
+	/** Reference to StoredPrompt.id, null for no specific prompt */
+	promptId: string | null;
+	/** Array of tool names this agent can use (subset of available tools) */
+	enabledToolNames: string[];
+	/** Optional preferred model for this agent */
+	preferredModel: string | null;
+	createdAt: number;
+	updatedAt: number;
+}
+
+/**
+ * Junction table for project-agent many-to-many relationship
+ * Defines which agents are available (rostered) for a project
+ */
+export interface StoredProjectAgent {
+	id: string;
+	projectId: string;
+	agentId: string;
+	createdAt: number;
+}
+
 /**
  * Ollama WebUI database class
  * Manages all local storage tables
@@ -284,6 +321,9 @@ class OllamaDatabase extends Dexie {
 	projects!: Table<StoredProject>;
 	projectLinks!: Table<StoredProjectLink>;
 	chatChunks!: Table<StoredChatChunk>;
+	// Agent-related tables (v7)
+	agents!: Table<StoredAgent>;
+	projectAgents!: Table<StoredProjectAgent>;
 
 	constructor() {
 		super('vessel');
@@ -374,6 +414,27 @@ class OllamaDatabase extends Dexie {
 			// Chat message chunks for cross-conversation RAG within projects
 			chatChunks: 'id, conversationId, projectId, createdAt'
 		});
+
+		// Version 7: Agents for specialized task handling
+		// Adds: agents table and project-agent junction table for roster assignment
+		this.version(7).stores({
+			conversations: 'id, updatedAt, isPinned, isArchived, systemPromptId, projectId',
+			messages: 'id, conversationId, parentId, createdAt',
+			attachments: 'id, messageId',
+			syncQueue: 'id, entityType, createdAt',
+			documents: 'id, name, createdAt, updatedAt, projectId',
+			chunks: 'id, documentId',
+			prompts: 'id, name, isDefault, updatedAt',
+			modelSystemPrompts: 'modelName',
+			modelPromptMappings: 'id, modelName, promptId',
+			projects: 'id, name, createdAt, updatedAt',
+			projectLinks: 'id, projectId, createdAt',
+			chatChunks: 'id, conversationId, projectId, createdAt',
+			// Agents: indexed by id and name for lookup/sorting
+			agents: 'id, name, createdAt, updatedAt',
+			// Project-Agent junction table with compound index for efficient queries
+			projectAgents: 'id, projectId, agentId, [projectId+agentId]'
+		});
 	}
 }
 
diff --git a/frontend/src/lib/storage/index.ts b/frontend/src/lib/storage/index.ts
index ee279b4..938e069 100644
--- a/frontend/src/lib/storage/index.ts
+++ b/frontend/src/lib/storage/index.ts
@@ -11,6 +11,8 @@ export type {
 	StoredAttachment,
 	SyncQueueItem,
 	StoredPrompt,
+	StoredAgent,
+	StoredProjectAgent,
 	StorageResult
 } from './db.js';
 
@@ -27,6 +29,7 @@ export {
 	archiveConversation,
 	updateMessageCount,
 	updateSystemPrompt,
+	updateAgentId,
 	searchConversations
 } from './conversations.js';
 
@@ -103,3 +106,17 @@ export {
 	clearDefaultPrompt,
 	searchPrompts
 } from './prompts.js';
+
+// Agent operations
+export {
+	getAllAgents,
+	getAgent,
+	createAgent,
+	updateAgent,
+	deleteAgent,
+	assignAgentToProject,
+	removeAgentFromProject,
+	getAgentsForProject,
+	getProjectsForAgent
+} from './agents.js';
+export type { Agent, CreateAgentData, UpdateAgentData } from './agents.js';
diff --git a/frontend/src/lib/stores/agents.svelte.ts b/frontend/src/lib/stores/agents.svelte.ts
new file mode 100644
index 0000000..954dde0
--- /dev/null
+++ b/frontend/src/lib/stores/agents.svelte.ts
@@ -0,0 +1,199 @@
+/**
+ * Agents state management using Svelte 5 runes
+ * Manages agent configurations with IndexedDB persistence
+ */
+
+import {
+	getAllAgents,
+	getAgent,
+	createAgent,
+	updateAgent,
+	deleteAgent,
+	assignAgentToProject,
+	removeAgentFromProject,
+	getAgentsForProject,
+	type Agent,
+	type CreateAgentData,
+	type UpdateAgentData
+} from '$lib/storage';
+
+/** Agents state class with reactive properties */
+export class AgentsState {
+	/** All available agents */
+	agents = $state<Agent[]>([]);
+
+	/** Loading state */
+	isLoading = $state(false);
+
+	/** Error state */
+	error = $state<string | null>(null);
+
+	/** Promise that resolves when initial load is complete */
+	private _readyPromise: Promise<void> | null = null;
+	private _readyResolve: (() => void) | null = null;
+
+	/** Derived: agents sorted alphabetically by name */
+	get sortedAgents(): Agent[] {
+		return [...this.agents].sort((a, b) => a.name.localeCompare(b.name));
+	}
+
+	constructor() {
+		// Create ready promise
+		this._readyPromise = new Promise((resolve) => {
+			this._readyResolve = resolve;
+		});
+
+		// Load agents on initialization (client-side only)
+		if (typeof window !== 'undefined') {
+			this.load();
+		} else {
+			// SSR: resolve immediately
+			this._readyResolve?.();
+		}
+	}
+
+	/** Wait for initial load to complete */
+	async ready(): Promise<void> {
+		return this._readyPromise ?? Promise.resolve();
+	}
+
+	/**
+	 * Load all agents from IndexedDB
+	 */
+	async load(): Promise<void> {
+		this.isLoading = true;
+		this.error = null;
+
+		try {
+			const result = await getAllAgents();
+			if (result.success) {
+				this.agents = result.data;
+			} else {
+				this.error = result.error;
+			}
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to load agents';
+		} finally {
+			this.isLoading = false;
+			this._readyResolve?.();
+		}
+	}
+
+	/**
+	 * Create a new agent
+	 */
+	async add(data: CreateAgentData): Promise<Agent | null> {
+		try {
+			const result = await createAgent(data);
+			if (result.success) {
+				this.agents = [...this.agents, result.data];
+				return result.data;
+			} else {
+				this.error = result.error;
+				return null;
+			}
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to create agent';
+			return null;
+		}
+	}
+
+	/**
+	 * Update an existing agent
+	 */
+	async update(id: string, updates: UpdateAgentData): Promise<boolean> {
+		try {
+			const result = await updateAgent(id, updates);
+			if (result.success) {
+				this.agents = this.agents.map((a) => (a.id === id ? result.data : a));
+				return true;
+			} else {
+				this.error = result.error;
+				return false;
+			}
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to update agent';
+			return false;
+		}
+	}
+
+	/**
+	 * Delete an agent
+	 */
+	async remove(id: string): Promise<boolean> {
+		try {
+			const result = await deleteAgent(id);
+			if (result.success) {
+				this.agents = this.agents.filter((a) => a.id !== id);
+				return true;
+			} else {
+				this.error = result.error;
+				return false;
+			}
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to delete agent';
+			return false;
+		}
+	}
+
+	/**
+	 * Get an agent by ID
+	 */
+	get(id: string): Agent | undefined {
+		return this.agents.find((a) => a.id === id);
+	}
+
+	/**
+	 * Assign an agent to a project
+	 */
+	async assignToProject(agentId: string, projectId: string): Promise<boolean> {
+		try {
+			const result = await assignAgentToProject(agentId, projectId);
+			return result.success;
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to assign agent to project';
+			return false;
+		}
+	}
+
+	/**
+	 * Remove an agent from a project
+	 */
+	async removeFromProject(agentId: string, projectId: string): Promise<boolean> {
+		try {
+			const result = await removeAgentFromProject(agentId, projectId);
+			return result.success;
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to remove agent from project';
+			return false;
+		}
+	}
+
+	/**
+	 * Get all agents assigned to a project
+	 */
+	async getForProject(projectId: string): Promise<Agent[]> {
+		try {
+			const result = await getAgentsForProject(projectId);
+			if (result.success) {
+				return result.data;
+			} else {
+				this.error = result.error;
+				return [];
+			}
+		} catch (err) {
+			this.error = err instanceof Error ? err.message : 'Failed to get agents for project';
+			return [];
+		}
+	}
+
+	/**
+	 * Clear any error state
+	 */
+	clearError(): void {
+		this.error = null;
+	}
+}
+
+/** Singleton agents state instance */
+export const agentsState = new AgentsState();
diff --git a/frontend/src/lib/stores/agents.test.ts b/frontend/src/lib/stores/agents.test.ts
new file mode 100644
index 0000000..d9d60f3
--- /dev/null
+++ b/frontend/src/lib/stores/agents.test.ts
@@ -0,0 +1,280 @@
+/**
+ * AgentsState store tests
+ *
+ * Tests the reactive state management for agents.
+ * Uses fake-indexeddb for in-memory IndexedDB testing.
+ */
+
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import 'fake-indexeddb/auto';
+import { db, generateId } from '$lib/storage/db.js';
+
+// Import after fake-indexeddb is set up
+let AgentsState: typeof import('./agents.svelte.js').AgentsState;
+let agentsState: InstanceType<typeof AgentsState>;
+
+describe('AgentsState', () => {
+	beforeEach(async () => {
+		// Clear database
+		await db.agents.clear();
+		await db.projectAgents.clear();
+
+		// Dynamically import to get fresh state
+		vi.resetModules();
+		const module = await import('./agents.svelte.js');
+		AgentsState = module.AgentsState;
+		agentsState = new AgentsState();
+
+		// Wait for initial load to complete
+		await agentsState.ready();
+	});
+
+	afterEach(async () => {
+		await db.agents.clear();
+		await db.projectAgents.clear();
+	});
+
+	describe('initialization', () => {
+		it('starts with empty agents array', async () => {
+			expect(agentsState.agents).toEqual([]);
+		});
+
+		it('loads agents on construction in browser', async () => {
+			// Pre-populate database
+			await db.agents.add({
+				id: generateId(),
+				name: 'Test Agent',
+				description: 'A test agent',
+				promptId: null,
+				enabledToolNames: [],
+				preferredModel: null,
+				createdAt: Date.now(),
+				updatedAt: Date.now()
+			});
+
+			// Create fresh instance
+			vi.resetModules();
+			const module = await import('./agents.svelte.js');
+			const freshState = new module.AgentsState();
+			await freshState.ready();
+
+			expect(freshState.agents.length).toBe(1);
+			expect(freshState.agents[0].name).toBe('Test Agent');
+		});
+	});
+
+	describe('sortedAgents', () => {
+		it('returns agents sorted alphabetically by name', async () => {
+			await agentsState.add({ name: 'Zeta', description: '' });
+			await agentsState.add({ name: 'Alpha', description: '' });
+			await agentsState.add({ name: 'Mid', description: '' });
+
+			const sorted = agentsState.sortedAgents;
+
+			expect(sorted[0].name).toBe('Alpha');
+			expect(sorted[1].name).toBe('Mid');
+			expect(sorted[2].name).toBe('Zeta');
+		});
+	});
+
+	describe('add', () => {
+		it('adds agent to state', async () => {
+			const agent = await agentsState.add({
+				name: 'New Agent',
+				description: 'Test description'
+			});
+
+			expect(agent).not.toBeNull();
+			expect(agentsState.agents.length).toBe(1);
+			expect(agentsState.agents[0].name).toBe('New Agent');
+		});
+
+		it('persists to storage', async () => {
+			const agent = await agentsState.add({
+				name: 'Persistent Agent',
+				description: ''
+			});
+
+			// Verify in database
+			const stored = await db.agents.get(agent!.id);
+			expect(stored).not.toBeUndefined();
+			expect(stored!.name).toBe('Persistent Agent');
+		});
+
+		it('returns agent with generated id and timestamps', async () => {
+			const before = Date.now();
+			const agent = await agentsState.add({
+				name: 'Agent',
+				description: ''
+			});
+			const after = Date.now();
+
+			expect(agent).not.toBeNull();
+			expect(agent!.id).toBeTruthy();
+			expect(agent!.createdAt.getTime()).toBeGreaterThanOrEqual(before);
+			expect(agent!.createdAt.getTime()).toBeLessThanOrEqual(after);
+		});
+	});
+
+	describe('update', () => {
+		it('updates agent in state', async () => {
+			const agent = await agentsState.add({ name: 'Original', description: '' });
+			expect(agent).not.toBeNull();
+
+			const success = await agentsState.update(agent!.id, { name: 'Updated' });
+
+			expect(success).toBe(true);
+			expect(agentsState.agents[0].name).toBe('Updated');
+		});
+
+		it('persists changes', async () => {
+			const agent = await agentsState.add({ name: 'Original', description: '' });
+			await agentsState.update(agent!.id, { description: 'New description' });
+
+			const stored = await db.agents.get(agent!.id);
+			expect(stored!.description).toBe('New description');
+		});
+
+		it('updates updatedAt timestamp', async () => {
+			const agent = await agentsState.add({ name: 'Agent', description: '' });
+			const originalUpdatedAt = agent!.updatedAt.getTime();
+
+			await new Promise((r) => setTimeout(r, 10));
+			await agentsState.update(agent!.id, { name: 'Changed' });
+
+			expect(agentsState.agents[0].updatedAt.getTime()).toBeGreaterThan(originalUpdatedAt);
+		});
+
+		it('returns false for non-existent agent', async () => {
+			const success = await agentsState.update('non-existent', { name: 'Updated' });
+			expect(success).toBe(false);
+		});
+	});
+
+	describe('remove', () => {
+		it('removes agent from state', async () => {
+			const agent = await agentsState.add({ name: 'To Delete', description: '' });
+			expect(agentsState.agents.length).toBe(1);
+
+			const success = await agentsState.remove(agent!.id);
+
+			expect(success).toBe(true);
+			expect(agentsState.agents.length).toBe(0);
+		});
+
+		it('removes from storage', async () => {
+			const agent = await agentsState.add({ name: 'To Delete', description: '' });
+			await agentsState.remove(agent!.id);
+
+			const stored = await db.agents.get(agent!.id);
+			expect(stored).toBeUndefined();
+		});
+
+		it('removes project-agent associations', async () => {
+			const agent = await agentsState.add({ name: 'Agent', description: '' });
+			const projectId = generateId();
+
+			await agentsState.assignToProject(agent!.id, projectId);
+
+			// Verify assignment exists
+			let assignments = await db.projectAgents.where('agentId').equals(agent!.id).toArray();
+			expect(assignments.length).toBe(1);
+
+			await agentsState.remove(agent!.id);
+
+			// Verify assignment removed
+			assignments = await db.projectAgents.where('agentId').equals(agent!.id).toArray();
+			expect(assignments.length).toBe(0);
+		});
+	});
+
+	describe('get', () => {
+		it('returns agent by id', async () => {
+			const agent = await agentsState.add({ name: 'Test', description: 'desc' });
+
+			const found = agentsState.get(agent!.id);
+
+			expect(found).not.toBeUndefined();
+			expect(found!.name).toBe('Test');
+		});
+
+		it('returns undefined for missing id', async () => {
+			const found = agentsState.get('non-existent');
+			expect(found).toBeUndefined();
+		});
+	});
+
+	describe('project relationships', () => {
+		it('gets agents for specific project', async () => {
+			const agent1 = await agentsState.add({ name: 'Agent 1', description: '' });
+			const agent2 = await agentsState.add({ name: 'Agent 2', description: '' });
+			const agent3 = await agentsState.add({ name: 'Agent 3', description: '' });
+
+			const projectId = generateId();
+			const otherProjectId = generateId();
+
+			await agentsState.assignToProject(agent1!.id, projectId);
+			await agentsState.assignToProject(agent2!.id, projectId);
+			await agentsState.assignToProject(agent3!.id, otherProjectId);
+
+			const agents = await agentsState.getForProject(projectId);
+
+			expect(agents.length).toBe(2);
+			const names = agents.map((a) => a.name).sort();
+			expect(names).toEqual(['Agent 1', 'Agent 2']);
+		});
+
+		it('assigns agent to project', async () => {
+			const agent = await agentsState.add({ name: 'Agent', description: '' });
+			const projectId = generateId();
+
+			const success = await agentsState.assignToProject(agent!.id, projectId);
+
+			expect(success).toBe(true);
+			const agents = await agentsState.getForProject(projectId);
+			expect(agents.length).toBe(1);
+		});
+
+		it('removes agent from project', async () => {
+			const agent = await agentsState.add({ name: 'Agent', description: '' });
+			const projectId = generateId();
+
+			await agentsState.assignToProject(agent!.id, projectId);
+			const success = await agentsState.removeFromProject(agent!.id, projectId);
+
+			expect(success).toBe(true);
+			const agents = await agentsState.getForProject(projectId);
+			expect(agents.length).toBe(0);
+		});
+
+		it('returns empty array for project with no agents', async () => {
+			const agents = await agentsState.getForProject(generateId());
+			expect(agents).toEqual([]);
+		});
+	});
+
+	describe('error handling', () => {
+		it('sets error state on failure', async () => {
+			// Force an error by updating non-existent agent
+			await agentsState.update('non-existent', { name: 'Test' });
+
+			expect(agentsState.error).not.toBeNull();
+			expect(agentsState.error).toContain('not found');
+		});
+
+		it('clears error state with clearError', async () => {
+			await agentsState.update('non-existent', { name: 'Test' });
+			expect(agentsState.error).not.toBeNull();
+
+			agentsState.clearError();
+
+			expect(agentsState.error).toBeNull();
+		});
+	});
+
+	describe('loading state', () => {
+		it('is false after load completes', async () => {
+			expect(agentsState.isLoading).toBe(false);
+		});
+	});
+});
diff --git a/frontend/src/lib/stores/conversations.svelte.ts b/frontend/src/lib/stores/conversations.svelte.ts
index 65d6499..e4400a2 100644
--- a/frontend/src/lib/stores/conversations.svelte.ts
+++ b/frontend/src/lib/stores/conversations.svelte.ts
@@ -226,6 +226,15 @@ export class ConversationsState {
 		this.update(id, { systemPromptId });
 	}
 
+	/**
+	 * Update the agent for a conversation
+	 * @param id The conversation ID
+	 * @param agentId The agent ID (or null to clear)
+	 */
+	setAgentId(id: string, agentId: string | null): void {
+		this.update(id, { agentId });
+	}
+
 	// ========================================================================
 	// Project-related methods
 	// ========================================================================
diff --git a/frontend/src/lib/stores/index.ts b/frontend/src/lib/stores/index.ts
index d331a75..3e49af7 100644
--- a/frontend/src/lib/stores/index.ts
+++ b/frontend/src/lib/stores/index.ts
@@ -13,6 +13,7 @@ export { SettingsState, settingsState } from './settings.svelte.js';
 export type { Prompt } from './prompts.svelte.js';
 export { VersionState, versionState } from './version.svelte.js';
 export { ProjectsState, projectsState } from './projects.svelte.js';
+export { AgentsState, agentsState } from './agents.svelte.js';
 
 // Re-export types for convenience
 export type { GroupedConversations } from './conversations.svelte.js';
diff --git a/frontend/src/lib/stores/tools-agent.test.ts b/frontend/src/lib/stores/tools-agent.test.ts
new file mode 100644
index 0000000..da01f8a
--- /dev/null
+++ b/frontend/src/lib/stores/tools-agent.test.ts
@@ -0,0 +1,131 @@
+/**
+ * Tool definitions for agents - integration tests
+ *
+ * Tests getToolDefinitionsForAgent functionality
+ */
+
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+
+// Mock localStorage
+const localStorageMock = (() => {
+	let store: Record<string, string> = {};
+	return {
+		getItem: (key: string) => store[key] || null,
+		setItem: (key: string, value: string) => {
+			store[key] = value;
+		},
+		removeItem: (key: string) => {
+			delete store[key];
+		},
+		clear: () => {
+			store = {};
+		}
+	};
+})();
+Object.defineProperty(global, 'localStorage', { value: localStorageMock });
+
+// Import after mocks are set up
+let toolsState: typeof import('./tools.svelte.js').toolsState;
+
+describe('getToolDefinitionsForAgent', () => {
+	beforeEach(async () => {
+		localStorageMock.clear();
+		vi.resetModules();
+
+		// Set up default tool enabled state (all tools enabled)
+		localStorageMock.setItem('toolsEnabled', 'true');
+		localStorageMock.setItem(
+			'enabledTools',
+			JSON.stringify({
+				fetch_url: true,
+				web_search: true,
+				calculate: true,
+				get_location: true,
+				get_current_time: true
+			})
+		);
+
+		const module = await import('./tools.svelte.js');
+		toolsState = module.toolsState;
+	});
+
+	it('returns empty array when toolsEnabled is false', async () => {
+		toolsState.toolsEnabled = false;
+
+		const result = toolsState.getToolDefinitionsForAgent(['fetch_url', 'calculate']);
+
+		expect(result).toEqual([]);
+	});
+
+	it('returns only tools matching enabledToolNames', async () => {
+		const result = toolsState.getToolDefinitionsForAgent(['fetch_url', 'calculate']);
+
+		expect(result.length).toBe(2);
+		const names = result.map((t) => t.function.name).sort();
+		expect(names).toEqual(['calculate', 'fetch_url']);
+	});
+
+	it('includes both builtin and custom tools', async () => {
+		// Add a custom tool
+		toolsState.addCustomTool({
+			name: 'my_custom_tool',
+			description: 'A custom tool',
+			implementation: 'javascript',
+			code: 'return args;',
+			parameters: {
+				type: 'object',
+				properties: {
+					input: { type: 'string' }
+				},
+				required: ['input']
+			},
+			enabled: true
+		});
+
+		const result = toolsState.getToolDefinitionsForAgent([
+			'fetch_url',
+			'my_custom_tool'
+		]);
+
+		expect(result.length).toBe(2);
+		const names = result.map((t) => t.function.name).sort();
+		expect(names).toEqual(['fetch_url', 'my_custom_tool']);
+	});
+
+	it('returns empty array for empty enabledToolNames', async () => {
+		const result = toolsState.getToolDefinitionsForAgent([]);
+
+		expect(result).toEqual([]);
+	});
+
+	it('ignores tool names that do not exist', async () => {
+		const result = toolsState.getToolDefinitionsForAgent([
+			'fetch_url',
+			'nonexistent_tool',
+			'calculate'
+		]);
+
+		expect(result.length).toBe(2);
+		const names = result.map((t) => t.function.name).sort();
+		expect(names).toEqual(['calculate', 'fetch_url']);
+	});
+
+	it('respects tool enabled state for included tools', async () => {
+		// Disable calculate tool
+		toolsState.setToolEnabled('calculate', false);
+
+		const result = toolsState.getToolDefinitionsForAgent(['fetch_url', 'calculate']);
+
+		// calculate is disabled, so it should not be included
+		expect(result.length).toBe(1);
+		expect(result[0].function.name).toBe('fetch_url');
+	});
+
+	it('returns all tools when null is passed (no agent)', async () => {
+		const withAgent = toolsState.getToolDefinitionsForAgent(['fetch_url']);
+		const withoutAgent = toolsState.getToolDefinitionsForAgent(null);
+
+		expect(withAgent.length).toBe(1);
+		expect(withoutAgent.length).toBeGreaterThan(1);
+	});
+});
diff --git a/frontend/src/lib/stores/tools.svelte.ts b/frontend/src/lib/stores/tools.svelte.ts
index d236acf..2cbfb8f 100644
--- a/frontend/src/lib/stores/tools.svelte.ts
+++ b/frontend/src/lib/stores/tools.svelte.ts
@@ -131,6 +131,57 @@ class ToolsState {
 		return enabled;
 	}
 
+	/**
+	 * Get tool definitions filtered by an agent's enabled tool names.
+	 * When null is passed, returns all enabled tools (no agent filtering).
+	 *
+	 * @param enabledToolNames - Array of tool names the agent can use, or null for all tools
+	 * @returns Tool definitions that match both the agent's list and are globally enabled
+	 */
+	getToolDefinitionsForAgent(enabledToolNames: string[] | null): ToolDefinition[] {
+		if (!this.toolsEnabled) {
+			return [];
+		}
+
+		// If null, return all enabled tools (no agent filtering)
+		if (enabledToolNames === null) {
+			return this.getEnabledToolDefinitions();
+		}
+
+		// If empty array, return no tools
+		if (enabledToolNames.length === 0) {
+			return [];
+		}
+
+		const toolNameSet = new Set(enabledToolNames);
+		const result: ToolDefinition[] = [];
+
+		// Filter builtin tools
+		const builtinDefs = toolRegistry.getDefinitions();
+		for (const def of builtinDefs) {
+			const name = def.function.name;
+			if (toolNameSet.has(name) && this.isToolEnabled(name)) {
+				result.push(def);
+			}
+		}
+
+		// Filter custom tools
+		for (const custom of this.customTools) {
+			if (toolNameSet.has(custom.name) && custom.enabled && this.isToolEnabled(custom.name)) {
+				result.push({
+					type: 'function',
+					function: {
+						name: custom.name,
+						description: custom.description,
+						parameters: custom.parameters
+					}
+				});
+			}
+		}
+
+		return result;
+	}
+
 	/**
 	 * Get all tool definitions with their enabled state
 	 */
diff --git a/frontend/src/lib/types/conversation.ts b/frontend/src/lib/types/conversation.ts
index 239cda1..6988bb5 100644
--- a/frontend/src/lib/types/conversation.ts
+++ b/frontend/src/lib/types/conversation.ts
@@ -18,6 +18,8 @@ export interface Conversation {
 	systemPromptId?: string | null;
 	/** Optional project ID this conversation belongs to */
 	projectId?: string | null;
+	/** Optional agent ID for this conversation (determines prompt and tools) */
+	agentId?: string | null;
 	/** Auto-generated conversation summary for cross-chat context */
 	summary?: string | null;
 	/** Timestamp when summary was last updated */
diff --git a/frontend/src/routes/settings/+page.svelte b/frontend/src/routes/settings/+page.svelte
index f3f917e..499755b 100644
--- a/frontend/src/routes/settings/+page.svelte
+++ b/frontend/src/routes/settings/+page.svelte
@@ -10,6 +10,7 @@
 		ModelsTab,
 		PromptsTab,
 		ToolsTab,
+		AgentsTab,
 		KnowledgeTab,
 		MemoryTab,
 		type SettingsTab
@@ -41,6 +42,8 @@
 				<PromptsTab />
 			{:else if activeTab === 'tools'}
 				<ToolsTab />
+			{:else if activeTab === 'agents'}
+				<AgentsTab />
 			{:else if activeTab === 'knowledge'}
 				<KnowledgeTab />
 			{:else if activeTab === 'memory'}