diff --git a/tests/engine/OpenCodeManager.protocol.test.ts b/tests/engine/OpenCodeManager.protocol.test.ts
new file mode 100644
index 0000000..9642ca4
--- /dev/null
+++ b/tests/engine/OpenCodeManager.protocol.test.ts
@@ -0,0 +1,152 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { OpenCodeManager } from '../../src/main/engine/OpenCodeManager';
+import { getProtocolTelemetryService } from '../../src/main/agentic/observability/protocolTelemetry';
+
+interface MockConversation {
+  id: string;
+  model?: string;
+  messages: Array<{ role: 'user' | 'assistant' | 'system' | 'tool'; content: string }>;
+}
+
+function createChatEngineMock(conversation: MockConversation) {
+  const settings = new Map<string, string>();
+  const addMessage = vi.fn().mockResolvedValue(undefined);
+
+  return {
+    getConversation: vi.fn().mockResolvedValue(conversation),
+    addMessage,
+    getDefaultSystemPrompt: vi.fn().mockResolvedValue('system prompt'),
+    getSetting: vi.fn(async (key: string) => settings.get(key) ?? null),
+    setSetting: vi.fn(async (key: string, value: string) => {
+      settings.set(key, value);
+    }),
+  };
+}
+
+describe('OpenCodeManager protocol integration', () => {
+  beforeEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('uses protocol envelope flow and persists workflow checkpoint for needs_input turns', async () => {
+    const conversation: MockConversation = {
+      id: 'conversation-1',
+      model: 'gpt-5',
+      messages: [
+        { role: 'system', content: 'system' },
+        { role: 'user', content: 'previous user message' },
+      ],
+    };
+
+    const chatEngineMock = createChatEngineMock(conversation);
+    const manager = new OpenCodeManager(
+      chatEngineMock as never,
+      {} as never,
+      {} as never,
+      () => null,
+    );
+
+    manager.setApiKey('test-api-key');
+
+    const providerSpy = vi.spyOn(manager as never, 'sendOpenAIMessage').mockResolvedValue({
+      content: JSON.stringify({
+        protocolVersion: '2.0',
+        assistantText: 'Please provide a date range.',
+        intent: 'ask_input',
+        needsInput: {
+          required: true,
+          fields: [{ key: 'dateRange', label: 'Date range', inputType: 'date' }],
+        },
+        actions: [],
+        confidence: 0.82,
+        traceId: 'trace-needs-input',
+      }),
+      toolCalls: [],
+    });
+
+    const telemetryBefore = getProtocolTelemetryService().getSnapshot();
+
+    const result = await manager.sendMessage('conversation-1', 'Generate report', {
+      metadata: { surface: 'tab' },
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.envelope?.protocolVersion).toBe('2.0');
+    expect(result.envelope?.needsInput.required).toBe(true);
+    expect(result.envelope?.needsInput.fields[0]?.key).toBe('dateRange');
+
+    expect(providerSpy).toHaveBeenCalledTimes(1);
+    const providerMessages = providerSpy.mock.calls[0][2] as Array<{ role: string; content?: string }>;
+    const latestUserMessage = providerMessages[providerMessages.length - 1]?.content ?? '';
+    expect(latestUserMessage).toContain('[Protocol request envelope]');
+    expect(latestUserMessage).toContain('"protocolVersion": "2.0"');
+    expect(latestUserMessage).toContain('"surface": "tab"');
+
+    const checkpointKey = 'agui.workflow.conversation-1';
+    expect(chatEngineMock.setSetting).toHaveBeenCalledWith(
+      checkpointKey,
+      expect.any(String),
+    );
+
+    const persistedCheckpoint = await chatEngineMock.getSetting(checkpointKey);
+    const checkpoint = JSON.parse(persistedCheckpoint as string) as { state: string; pendingFields: string[]; lastTraceId: string };
+    expect(checkpoint.state).toBe('awaiting_input');
+    expect(checkpoint.pendingFields).toEqual(['dateRange']);
+    expect(checkpoint.lastTraceId).toBe('trace-needs-input');
+
+    const telemetryAfter = getProtocolTelemetryService().getSnapshot();
+    expect(telemetryAfter.totalTurns).toBe(telemetryBefore.totalTurns + 1);
+    expect(telemetryAfter.validEnvelopeTurns).toBe(telemetryBefore.validEnvelopeTurns + 1);
+  });
+
+  it('blocks unsupported actions and records blocked-action telemetry', async () => {
+    const conversation: MockConversation = {
+      id: 'conversation-2',
+      model: 'gpt-5',
+      messages: [{ role: 'user', content: 'previous user message' }],
+    };
+
+    const chatEngineMock = createChatEngineMock(conversation);
+    const manager = new OpenCodeManager(
+      chatEngineMock as never,
+      {} as never,
+      {} as never,
+      () => null,
+    );
+    manager.setApiKey('test-api-key');
+
+    vi.spyOn(manager as never, 'sendOpenAIMessage').mockResolvedValue({
+      content: JSON.stringify({
+        protocolVersion: '2.0',
+        assistantText: 'Try toggling sidebar.',
+        intent: 'propose_action',
+        needsInput: { required: false, fields: [] },
+        actions: [
+          {
+            id: 'a1',
+            action: 'toggleAssistantSidebar',
+            label: 'Toggle assistant sidebar',
+            policy: 'silent',
+            requiresConfirmation: false,
+          },
+        ],
+        confidence: 0.74,
+        traceId: 'trace-blocked-action',
+      }),
+      toolCalls: [],
+    });
+
+    const telemetryBefore = getProtocolTelemetryService().getSnapshot();
+
+    const result = await manager.sendMessage('conversation-2', 'Toggle it', {
+      metadata: { surface: 'tab' },
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.envelope?.actions).toEqual([]);
+    expect(result.warnings?.some((warning) => warning.includes('Blocked unsupported action: toggleAssistantSidebar'))).toBe(true);
+
+    const telemetryAfter = getProtocolTelemetryService().getSnapshot();
+    expect(telemetryAfter.blockedActionCount).toBe(telemetryBefore.blockedActionCount + 1);
+  });
+});
\ No newline at end of file
diff --git a/tests/engine/agentic/observability/protocolTelemetry.test.ts b/tests/engine/agentic/observability/protocolTelemetry.test.ts
index 99bf897..61f54fa 100644
--- a/tests/engine/agentic/observability/protocolTelemetry.test.ts
+++ b/tests/engine/agentic/observability/protocolTelemetry.test.ts
@@ -1,7 +1,20 @@
 import { describe, expect, it } from 'vitest';
-import { ProtocolTelemetryService } from '../../../../src/main/agentic/observability/protocolTelemetry';
+import {
+  ProtocolTelemetryService,
+  getProtocolTelemetryService,
+} from '../../../../src/main/agentic/observability/protocolTelemetry';
 
 describe('ProtocolTelemetryService', () => {
+  it('returns zero rates before any turns are recorded', () => {
+    const telemetry = new ProtocolTelemetryService();
+    const snapshot = telemetry.getSnapshot();
+
+    expect(snapshot.totalTurns).toBe(0);
+    expect(snapshot.parseValidityRate).toBe(0);
+    expect(snapshot.repairRate).toBe(0);
+    expect(snapshot.fallbackRate).toBe(0);
+  });
+
   it('tracks parse validity, repairs, fallback, and blocked actions', () => {
     const telemetry = new ProtocolTelemetryService();
 
@@ -35,4 +48,11 @@ describe('ProtocolTelemetryService', () => {
     expect(snapshot.blockedActionCount).toBe(3);
     expect(snapshot.parseValidityRate).toBeCloseTo(2 / 3, 5);
   });
+
+  it('returns the same singleton telemetry service instance', () => {
+    const first = getProtocolTelemetryService();
+    const second = getProtocolTelemetryService();
+
+    expect(first).toBe(second);
+  });
 });
diff --git a/tests/engine/agentic/protocol/responseBuilder.test.ts b/tests/engine/agentic/protocol/responseBuilder.test.ts
index bd02737..286782b 100644
--- a/tests/engine/agentic/protocol/responseBuilder.test.ts
+++ b/tests/engine/agentic/protocol/responseBuilder.test.ts
@@ -114,4 +114,61 @@ describe('ProtocolResponseBuilder', () => {
     expect(result.envelope.actions).toHaveLength(0);
     expect(result.warnings.some((warning) => warning.includes('openSettings'))).toBe(true);
   });
+
+  it('extracts declarative actions from UI elements and applies policy defaults', () => {
+    const builder = new ProtocolResponseBuilder();
+
+    const raw = JSON.stringify({
+      protocolVersion: '2.0',
+      assistantText: 'Choose an option',
+      intent: 'propose_action',
+      needsInput: { required: false, fields: [] },
+      actions: [],
+      ui: {
+        specVersion: '1',
+        elements: [
+          {
+            type: 'card',
+            title: 'Actions',
+            body: 'Pick one',
+            actions: [{ label: 'Delete', action: 'deletePost' }],
+          },
+          {
+            type: 'tabs',
+            tabs: [
+              {
+                id: 'first',
+                label: 'First',
+                elements: [{ type: 'action', label: 'Open post', action: 'openPost' }],
+              },
+            ],
+          },
+        ],
+      },
+      confidence: 0.7,
+      traceId: 'trace-ui-actions',
+    });
+
+    const result = builder.build({
+      rawAssistantOutput: raw,
+      surface: 'tab',
+      capabilities: {
+        widgets: ['card', 'tabs', 'action'],
+        actions: ['deletePost', 'openPost'],
+        tools: ['search_posts'],
+      },
+    });
+
+    expect(result.envelope.actions).toHaveLength(2);
+    expect(result.envelope.actions[0]).toEqual(expect.objectContaining({
+      action: 'deletePost',
+      policy: 'danger',
+      requiresConfirmation: true,
+    }));
+    expect(result.envelope.actions[1]).toEqual(expect.objectContaining({
+      action: 'openPost',
+      policy: 'silent',
+      requiresConfirmation: false,
+    }));
+  });
 });
diff --git a/tests/engine/agentic/protocol/uiSpecParser.test.ts b/tests/engine/agentic/protocol/uiSpecParser.test.ts
new file mode 100644
index 0000000..bc8e725
--- /dev/null
+++ b/tests/engine/agentic/protocol/uiSpecParser.test.ts
@@ -0,0 +1,93 @@
+import { describe, expect, it } from 'vitest';
+import { extractAssistantUiSpec } from '../../../../src/main/agentic/protocol/uiSpecParser';
+
+describe('extractAssistantUiSpec', () => {
+  it('extracts fenced JSON spec and preserves assistant text around it', () => {
+    const input = [
+      'Here is your dashboard.',
+      '```json',
+      '{"specVersion":"1","elements":[{"type":"text","text":"Hello"}]}',
+      '```',
+      'Anything else?',
+    ].join('\n');
+
+    const result = extractAssistantUiSpec(input);
+
+    expect(result.ui).not.toBeNull();
+    expect(result.ui?.specVersion).toBe('1');
+    expect(result.ui?.elements).toHaveLength(1);
+    expect(result.assistantText).toContain('Here is your dashboard.');
+    expect(result.assistantText).toContain('Anything else?');
+  });
+
+  it('normalizes markdown element into canonical text element', () => {
+    const input = JSON.stringify({
+      specVersion: '1',
+      elements: [{ type: 'markdown', content: '## Title' }],
+    });
+
+    const result = extractAssistantUiSpec(input);
+    const first = result.ui?.elements[0] as { type: string; text?: string };
+
+    expect(result.ui).not.toBeNull();
+    expect(first.type).toBe('text');
+    expect(first.text).toBe('## Title');
+  });
+
+  it('normalizes chart data datasets into chart series', () => {
+    const input = JSON.stringify({
+      specVersion: '1',
+      elements: [
+        {
+          type: 'chart',
+          chartType: 'bar',
+          data: {
+            labels: ['Jan', 'Feb'],
+            datasets: [{ data: [10, 20] }],
+          },
+        },
+      ],
+    });
+
+    const result = extractAssistantUiSpec(input);
+    const first = result.ui?.elements[0] as { series?: Array<{ label: string; value: number }>; data?: unknown };
+
+    expect(result.ui).not.toBeNull();
+    expect(first.series).toEqual([
+      { label: 'Jan', value: 10 },
+      { label: 'Feb', value: 20 },
+    ]);
+    expect(first.data).toBeUndefined();
+  });
+
+  it('normalizes tabs content to nested elements arrays', () => {
+    const input = JSON.stringify({
+      type: 'tabs',
+      tabs: [
+        {
+          title: 'Overview',
+          content: { type: 'text', text: 'Summary' },
+        },
+      ],
+    });
+
+    const result = extractAssistantUiSpec(input);
+    const tabs = result.ui?.elements[0] as {
+      tabs: Array<{ id: string; label: string; elements: Array<{ type: string; text?: string }> }>;
+    };
+
+    expect(result.ui).not.toBeNull();
+    expect(tabs.tabs).toHaveLength(1);
+    expect(tabs.tabs[0].id).toBe('tab-1');
+    expect(tabs.tabs[0].label).toBe('Overview');
+    expect(tabs.tabs[0].elements[0]).toEqual({ type: 'text', text: 'Summary' });
+  });
+
+  it('returns plain assistant text when malformed JSON is provided', () => {
+    const input = '{"specVersion":"1","elements":[{"type":"text"}';
+    const result = extractAssistantUiSpec(input);
+
+    expect(result.ui).toBeNull();
+    expect(result.assistantText).toBe(input);
+  });
+});
\ No newline at end of file
diff --git a/tests/engine/agentic/protocol/validator.test.ts b/tests/engine/agentic/protocol/validator.test.ts
index d769390..4220744 100644
--- a/tests/engine/agentic/protocol/validator.test.ts
+++ b/tests/engine/agentic/protocol/validator.test.ts
@@ -71,4 +71,23 @@ describe('agentic protocol validator', () => {
 
     expect(result.ok).toBe(true);
   });
+
+  it('rejects invalid request envelope and returns structured protocol error', () => {
+    const result = validateProtocolRequestEnvelope({
+      protocolVersion: '2.0',
+      surface: 'tab',
+      messages: [{ role: 'invalid-role', content: 'Create a chart' }],
+      context: { projectId: 'project-1' },
+      capabilities: {
+        widgets: ['chart'],
+        actions: ['openPost'],
+        tools: ['search_posts'],
+      },
+      unknown: true,
+    });
+
+    expect(result.ok).toBe(false);
+    expect(result.error?.code).toBe('AGUI_PROTOCOL_VALIDATION_ERROR');
+    expect(result.error?.details?.length).toBeGreaterThan(0);
+  });
 });
diff --git a/tests/engine/agentic/workflow/checkpointStore.test.ts b/tests/engine/agentic/workflow/checkpointStore.test.ts
index 4081327..d351681 100644
--- a/tests/engine/agentic/workflow/checkpointStore.test.ts
+++ b/tests/engine/agentic/workflow/checkpointStore.test.ts
@@ -36,4 +36,42 @@ describe('WorkflowCheckpointStore', () => {
     expect(loaded?.pendingFields).toEqual(['date']);
     expect(loaded?.lastTraceId).toBe('trace-1');
   });
+
+  it('returns null when no checkpoint exists', async () => {
+    const adapter = new InMemorySettingsAdapter();
+    const store = new WorkflowCheckpointStore(adapter);
+
+    const loaded = await store.load('missing-conversation');
+
+    expect(loaded).toBeNull();
+  });
+
+  it('returns null for malformed checkpoint JSON', async () => {
+    const adapter = new InMemorySettingsAdapter();
+    await adapter.setSetting('agui.workflow.conversation-2', '{not-valid-json');
+    const store = new WorkflowCheckpointStore(adapter);
+
+    const loaded = await store.load('conversation-2');
+
+    expect(loaded).toBeNull();
+  });
+
+  it('returns null when stored checkpoint conversation id does not match', async () => {
+    const adapter = new InMemorySettingsAdapter();
+    await adapter.setSetting(
+      'agui.workflow.conversation-3',
+      JSON.stringify({
+        conversationId: 'other-conversation',
+        state: 'planning',
+        pendingFields: [],
+        lastTraceId: 'trace-mismatch',
+        updatedAt: new Date('2026-02-25T10:00:00.000Z').toISOString(),
+      }),
+    );
+
+    const store = new WorkflowCheckpointStore(adapter);
+    const loaded = await store.load('conversation-3');
+
+    expect(loaded).toBeNull();
+  });
 });
diff --git a/tests/engine/agentic/workflow/stateMachine.test.ts b/tests/engine/agentic/workflow/stateMachine.test.ts
index 2144d36..5447519 100644
--- a/tests/engine/agentic/workflow/stateMachine.test.ts
+++ b/tests/engine/agentic/workflow/stateMachine.test.ts
@@ -35,4 +35,72 @@ describe('AgentTurnStateMachine', () => {
 
     expect(next).toBe('completed');
   });
+
+  it('transitions to executing when intent requests action execution', () => {
+    const stateMachine = new AgentTurnStateMachine();
+
+    const next = stateMachine.transition({
+      previousState: 'planning',
+      envelope: {
+        intent: 'execute_action',
+        needsInput: {
+          required: false,
+          fields: [],
+        },
+      },
+    });
+
+    expect(next).toBe('executing');
+  });
+
+  it('transitions to observing when proposing actions', () => {
+    const stateMachine = new AgentTurnStateMachine();
+
+    const next = stateMachine.transition({
+      previousState: 'planning',
+      envelope: {
+        intent: 'propose_action',
+        needsInput: {
+          required: false,
+          fields: [],
+        },
+      },
+    });
+
+    expect(next).toBe('observing');
+  });
+
+  it('returns to executing after awaiting input when input is no longer required', () => {
+    const stateMachine = new AgentTurnStateMachine();
+
+    const next = stateMachine.transition({
+      previousState: 'awaiting_input',
+      envelope: {
+        intent: 'analyze',
+        needsInput: {
+          required: false,
+          fields: [],
+        },
+      },
+    });
+
+    expect(next).toBe('executing');
+  });
+
+  it('stays in planning for non-terminal analyze intent by default', () => {
+    const stateMachine = new AgentTurnStateMachine();
+
+    const next = stateMachine.transition({
+      previousState: 'planning',
+      envelope: {
+        intent: 'analyze',
+        needsInput: {
+          required: false,
+          fields: [],
+        },
+      },
+    });
+
+    expect(next).toBe('planning');
+  });
 });
diff --git a/tests/ipc/chatHandlers.test.ts b/tests/ipc/chatHandlers.test.ts
new file mode 100644
index 0000000..7730c62
--- /dev/null
+++ b/tests/ipc/chatHandlers.test.ts
@@ -0,0 +1,185 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+const registeredHandlers = new Map<string, (...args: any[]) => Promise<any>>();
+
+const webContentsSend = vi.fn();
+const mainWindowMock = {
+  webContents: {
+    send: webContentsSend,
+  },
+};
+
+const protocolSnapshot = {
+  totalTurns: 3,
+  validEnvelopeTurns: 2,
+  repairAttempts: 1,
+  fallbackTurns: 1,
+  blockedActionCount: 2,
+  parseValidityRate: 2 / 3,
+  repairRate: 1 / 3,
+  fallbackRate: 1 / 3,
+};
+
+const telemetryServiceMock = {
+  getSnapshot: vi.fn(() => protocolSnapshot),
+};
+
+const chatEngineInstances: Array<Record<string, any>> = [];
+const openCodeManagerInstances: Array<Record<string, any>> = [];
+
+vi.mock('electron', () => ({
+  BrowserWindow: {
+    fromWebContents: vi.fn(),
+  },
+  ipcMain: {
+    handle: vi.fn((channel: string, handler: (...args: any[]) => Promise<any>) => {
+      registeredHandlers.set(channel, handler);
+    }),
+  },
+}));
+
+vi.mock('../../src/main/database', () => ({
+  getDatabase: vi.fn(() => ({})),
+}));
+
+vi.mock('../../src/main/engine/PostEngine', () => ({
+  getPostEngine: vi.fn(() => ({})),
+}));
+
+vi.mock('../../src/main/engine/MediaEngine', () => ({
+  getMediaEngine: vi.fn(() => ({})),
+}));
+
+vi.mock('../../src/main/agentic/observability/protocolTelemetry', () => ({
+  getProtocolTelemetryService: vi.fn(() => telemetryServiceMock),
+}));
+
+vi.mock('../../src/main/engine/ChatEngine', () => ({
+  ChatEngine: class {
+    constructor() {
+      const instance = {
+        getSetting: vi.fn(async (key: string) => (key === 'opencode_api_key' ? 'stored-key' : null)),
+        setSetting: vi.fn(async () => undefined),
+        getSelectedModel: vi.fn(async () => 'gpt-5'),
+        getDefaultSystemPrompt: vi.fn(async () => 'system prompt'),
+      };
+      chatEngineInstances.push(instance);
+      return instance;
+    }
+  },
+}));
+
+vi.mock('../../src/main/engine/OpenCodeManager', () => ({
+  OpenCodeManager: class {
+    constructor() {
+      const instance = {
+        setApiKey: vi.fn(),
+        checkReady: vi.fn(async () => ({ ready: true })),
+        validateApiKey: vi.fn(async () => ({ isValid: true, models: [] })),
+        getApiKey: vi.fn(() => 'abc12345'),
+        getAvailableModels: vi.fn(async () => []),
+        sendMessage: vi.fn(async (_conversationId: string, _message: string, options: any) => {
+          options?.onDelta?.('stream-delta');
+          options?.onToolCall?.({ name: 'search_posts', args: { query: 'q' } });
+          options?.onToolResult?.({ name: 'search_posts', result: { ok: true } });
+          return {
+            success: true,
+            message: 'assistant reply',
+            envelope: {
+              protocolVersion: '2.0',
+              assistantText: 'assistant reply',
+              intent: 'summarize',
+              needsInput: { required: false, fields: [] },
+              actions: [],
+              confidence: 0.9,
+              traceId: 'trace-1',
+            },
+            protocolVersion: '2.0',
+            traceId: 'trace-1',
+            warnings: [],
+          };
+        }),
+        abortMessage: vi.fn(async () => ({ success: true })),
+        analyzeTaxonomy: vi.fn(async () => ({ success: true })),
+        analyzeMediaImage: vi.fn(async () => ({ success: true })),
+        stop: vi.fn(async () => undefined),
+      };
+      openCodeManagerInstances.push(instance);
+      return instance;
+    }
+  },
+}));
+
+describe('chatHandlers', () => {
+  beforeEach(() => {
+    registeredHandlers.clear();
+    webContentsSend.mockReset();
+    chatEngineInstances.length = 0;
+    openCodeManagerInstances.length = 0;
+    telemetryServiceMock.getSnapshot.mockClear();
+    vi.resetModules();
+  });
+
+  afterEach(async () => {
+    const mod = await import('../../src/main/ipc/chatHandlers');
+    await mod.cleanupChatHandlers();
+  });
+
+  it('returns protocol health snapshot from telemetry service', async () => {
+    const mod = await import('../../src/main/ipc/chatHandlers');
+    mod.registerChatHandlers();
+
+    const handler = registeredHandlers.get('chat:getProtocolHealth');
+    expect(handler).toBeDefined();
+
+    const result = await handler!();
+
+    expect(telemetryServiceMock.getSnapshot).toHaveBeenCalledTimes(1);
+    expect(result).toEqual(protocolSnapshot);
+  });
+
+  it('streams sendMessage callbacks through main window events', async () => {
+    const mod = await import('../../src/main/ipc/chatHandlers');
+    mod.initializeChatHandlers(() => mainWindowMock as never);
+    mod.registerChatHandlers();
+
+    const handler = registeredHandlers.get('chat:sendMessage');
+    expect(handler).toBeDefined();
+
+    const result = await handler!(
+      undefined,
+      'conversation-1',
+      'hello assistant',
+      { surface: 'sidebar' },
+    );
+
+    expect(result.success).toBe(true);
+    expect(result.envelope?.protocolVersion).toBe('2.0');
+
+    const manager = openCodeManagerInstances[0];
+    expect(manager.setApiKey).toHaveBeenCalledWith('stored-key');
+    expect(manager.sendMessage).toHaveBeenCalledWith(
+      'conversation-1',
+      'hello assistant',
+      expect.objectContaining({
+        metadata: { surface: 'sidebar' },
+        onDelta: expect.any(Function),
+        onToolCall: expect.any(Function),
+        onToolResult: expect.any(Function),
+      }),
+    );
+
+    expect(webContentsSend).toHaveBeenCalledWith('chat-stream-delta', {
+      conversationId: 'conversation-1',
+      delta: 'stream-delta',
+    });
+    expect(webContentsSend).toHaveBeenCalledWith('chat-tool-call', {
+      conversationId: 'conversation-1',
+      toolCall: { name: 'search_posts', args: { query: 'q' } },
+    });
+    expect(webContentsSend).toHaveBeenCalledWith('chat-tool-result', {
+      conversationId: 'conversation-1',
+      result: { name: 'search_posts', result: { ok: true } },
+    });
+  });
+});
\ No newline at end of file