feat: add tool calling support to Ollama and llama.cpp clients

- Ollama: pass tools to API, parse tool_calls responses, handle thinking field from reasoning models (deepseek-r1, glm-4.7-flash)
- llama.cpp: pass tools via OpenAI-compatible endpoint, parse tool_calls, accumulate streaming tool call deltas
- Both clients now set stopReason to 'tool_use' when tool calls are present
- Tests: 12 new tests (8 Ollama + 5 llama.cpp, total 983→995)

src/models/local/llamacpp.test.ts

@@ -6,6 +6,7 @@ describe('LlamaCppClient', () => {
   const mockFetch = vi.fn();
 
   beforeEach(() => {
+    mockFetch.mockReset();
     vi.stubGlobal('fetch', mockFetch);
   });
 
@@ -96,4 +97,247 @@ describe('LlamaCppClient', () => {
       messages: [{ role: 'user', content: 'Hello' }],
     })).rejects.toThrow('llama-server not running at http://localhost:8080');
   });
+
+  it('passes tools in request body', async () => {
+    mockFetch.mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        choices: [{ message: { content: 'I can help with that.' } }],
+        usage: { prompt_tokens: 12, completion_tokens: 6 },
+      }),
+    });
+
+    const client = new LlamaCppClient({
+      endpoint: 'http://localhost:8080',
+      model: 'test-model',
+    });
+
+    await client.chat({
+      messages: [{ role: 'user', content: 'Run ls' }],
+      tools: [{
+        name: 'shell.exec',
+        description: 'Run shell',
+        input_schema: {
+          type: 'object',
+          properties: { command: { type: 'string' } },
+          required: ['command'],
+        },
+      }],
+    });
+
+    const requestBody = JSON.parse(mockFetch.mock.calls[0][1].body);
+    expect(requestBody.tools).toEqual([{
+      type: 'function',
+      function: {
+        name: 'shell.exec',
+        description: 'Run shell',
+        parameters: {
+          type: 'object',
+          properties: { command: { type: 'string' } },
+          required: ['command'],
+        },
+      },
+    }]);
+  });
+
+  it('parses tool_calls from response', async () => {
+    mockFetch.mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        choices: [{
+          message: {
+            content: null,
+            tool_calls: [{
+              id: 'call_123',
+              type: 'function',
+              function: { name: 'shell.exec', arguments: '{"command":"ls"}' },
+            }],
+          },
+          finish_reason: 'tool_calls',
+        }],
+        usage: { prompt_tokens: 15, completion_tokens: 8 },
+      }),
+    });
+
+    const client = new LlamaCppClient({
+      endpoint: 'http://localhost:8080',
+      model: 'test-model',
+    });
+
+    const response = await client.chat({
+      messages: [{ role: 'user', content: 'List files' }],
+      tools: [{
+        name: 'shell.exec',
+        description: 'Run shell',
+        input_schema: {
+          type: 'object',
+          properties: { command: { type: 'string' } },
+          required: ['command'],
+        },
+      }],
+    });
+
+    expect(response.stopReason).toBe('tool_use');
+    expect(response.toolCalls).toHaveLength(1);
+    expect(response.toolCalls![0]).toEqual({
+      id: 'call_123',
+      name: 'shell.exec',
+      args: { command: 'ls' },
+    });
+    expect(response.usage.inputTokens).toBe(15);
+    expect(response.usage.outputTokens).toBe(8);
+  });
+
+  it('does not send tools when none provided', async () => {
+    mockFetch.mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        choices: [{ message: { content: 'Hello!' } }],
+        usage: { prompt_tokens: 5, completion_tokens: 2 },
+      }),
+    });
+
+    const client = new LlamaCppClient({
+      endpoint: 'http://localhost:8080',
+      model: 'test-model',
+    });
+
+    await client.chat({
+      messages: [{ role: 'user', content: 'Hello' }],
+    });
+
+    const requestBody = JSON.parse(mockFetch.mock.calls[0][1].body);
+    expect(requestBody.tools).toBeUndefined();
+  });
+
+  it('streaming: accumulates and yields tool_calls from deltas', async () => {
+    const chunks = [
+      'data: {"choices":[{"delta":{"tool_calls":[{"index":0,"id":"call_1","type":"function","function":{"name":"shell.exec"}}]}}]}\n\n',
+      'data: {"choices":[{"delta":{"tool_calls":[{"index":0,"function":{"arguments":"{\\"comma"}}]}}]}\n\n',
+      'data: {"choices":[{"delta":{"tool_calls":[{"index":0,"function":{"arguments":"nd\\":\\"ls\\"}"}}]}}]}\n\n',
+      'data: {"choices":[{}],"usage":{"prompt_tokens":10,"completion_tokens":5}}\n\n',
+      'data: [DONE]\n\n',
+    ];
+
+    const encoder = new TextEncoder();
+    let chunkIndex = 0;
+
+    const mockStream = new ReadableStream({
+      pull(controller) {
+        if (chunkIndex < chunks.length) {
+          controller.enqueue(encoder.encode(chunks[chunkIndex]));
+          chunkIndex++;
+        } else {
+          controller.close();
+        }
+      },
+    });
+
+    mockFetch.mockResolvedValue({
+      ok: true,
+      body: mockStream,
+    });
+
+    const client = new LlamaCppClient({
+      endpoint: 'http://localhost:8080',
+      model: 'test-model',
+    });
+
+    const events: ChatStreamEvent[] = [];
+    for await (const event of client.chatStream({
+      messages: [{ role: 'user', content: 'Run ls' }],
+      tools: [{
+        name: 'shell.exec',
+        description: 'Run shell',
+        input_schema: {
+          type: 'object',
+          properties: { command: { type: 'string' } },
+          required: ['command'],
+        },
+      }],
+    })) {
+      events.push(event);
+    }
+
+    // Should have a tool_use event and a done event
+    const toolUseEvents = events.filter(e => e.type === 'tool_use');
+    const doneEvents = events.filter(e => e.type === 'done');
+
+    expect(toolUseEvents).toHaveLength(1);
+    expect(toolUseEvents[0].toolCall).toEqual({
+      id: 'call_1',
+      name: 'shell.exec',
+      args: { command: 'ls' },
+    });
+
+    expect(doneEvents).toHaveLength(1);
+    expect(doneEvents[0].usage).toEqual({
+      inputTokens: 10,
+      outputTokens: 5,
+    });
+  });
+
+  it('streaming: passes tools in request body', async () => {
+    const chunks = [
+      'data: {"choices":[{"delta":{"content":"Hi"}}]}\n\n',
+      'data: {"choices":[{}],"usage":{"prompt_tokens":3,"completion_tokens":1}}\n\n',
+      'data: [DONE]\n\n',
+    ];
+
+    const encoder = new TextEncoder();
+    let chunkIndex = 0;
+
+    const mockStream = new ReadableStream({
+      pull(controller) {
+        if (chunkIndex < chunks.length) {
+          controller.enqueue(encoder.encode(chunks[chunkIndex]));
+          chunkIndex++;
+        } else {
+          controller.close();
+        }
+      },
+    });
+
+    mockFetch.mockResolvedValue({
+      ok: true,
+      body: mockStream,
+    });
+
+    const client = new LlamaCppClient({
+      endpoint: 'http://localhost:8080',
+      model: 'test-model',
+    });
+
+    // Consume the stream to trigger the fetch call
+    const events: ChatStreamEvent[] = [];
+    for await (const event of client.chatStream({
+      messages: [{ role: 'user', content: 'Hi' }],
+      tools: [{
+        name: 'shell.exec',
+        description: 'Run shell',
+        input_schema: {
+          type: 'object',
+          properties: { command: { type: 'string' } },
+          required: ['command'],
+        },
+      }],
+    })) {
+      events.push(event);
+    }
+
+    const requestBody = JSON.parse(mockFetch.mock.calls[0][1].body);
+    expect(requestBody.tools).toEqual([{
+      type: 'function',
+      function: {
+        name: 'shell.exec',
+        description: 'Run shell',
+        parameters: {
+          type: 'object',
+          properties: { command: { type: 'string' } },
+          required: ['command'],
+        },
+      },
+    }]);
+    expect(requestBody.stream).toBe(true);
+  });
 });

src/models/local/llamacpp.ts

@@ -1,4 +1,4 @@
-import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient } from '../types.js';
+import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient, ModelToolCall } from '../types.js';
 import { getMessageText } from '../media.js';
 
 export interface LlamaCppClientConfig {
@@ -12,13 +12,42 @@ interface LlamaCppMessage {
   content: string;
 }
 
+interface LlamaCppToolCall {
+  id: string;
+  type: 'function';
+  function: {
+    name: string;
+    arguments: string; // JSON string
+  };
+}
+
 interface LlamaCppResponse {
-  choices: Array<{ message: { content: string } }>;
+  choices: Array<{
+    message: {
+      content: string | null;
+      tool_calls?: LlamaCppToolCall[];
+    };
+    finish_reason?: string;
+  }>;
   usage: { prompt_tokens: number; completion_tokens: number };
 }
 
 interface LlamaCppStreamChunk {
-  choices: Array<{ delta?: { content?: string } }>;
+  choices: Array<{
+    delta?: {
+      content?: string;
+      tool_calls?: Array<{
+        index: number;
+        id?: string;
+        type?: string;
+        function?: {
+          name?: string;
+          arguments?: string;
+        };
+      }>;
+    };
+    finish_reason?: string | null;
+  }>;
   usage?: { prompt_tokens: number; completion_tokens: number };
 }
 
@@ -54,14 +83,28 @@ export class LlamaCppClient implements ModelClient {
 
     let response: Response;
     try {
+      const body: Record<string, unknown> = {
+        model: this.model,
+        messages,
+        max_tokens: request.maxTokens ?? 2048,
+      };
+
+      // Pass tool definitions to the API if provided
+      if (request.tools && request.tools.length > 0) {
+        body.tools = request.tools.map(t => ({
+          type: 'function' as const,
+          function: {
+            name: t.name,
+            description: t.description,
+            parameters: t.input_schema,
+          },
+        }));
+      }
+
       response = await fetch(`${this.endpoint}/v1/chat/completions`, {
         method: 'POST',
         headers,
-        body: JSON.stringify({
-          model: this.model,
-          messages,
-          max_tokens: request.maxTokens ?? 2048,
-        }),
+        body: JSON.stringify(body),
       });
     } catch (error) {
       if (error instanceof TypeError && error.message.includes('fetch failed')) {
@@ -77,13 +120,24 @@ export class LlamaCppClient implements ModelClient {
 
     const data = (await response.json()) as LlamaCppResponse;
 
+    // Parse tool calls from the response, if present
+    const toolCalls: ModelToolCall[] = data.choices[0]?.message?.tool_calls?.map((tc) => ({
+      id: tc.id ?? `llamacpp_tc_${Math.random().toString(36).slice(2, 8)}`,
+      name: tc.function.name,
+      args: JSON.parse(tc.function.arguments),
+    })) ?? [];
+
+    // Set stopReason to 'tool_use' when tool_calls are present
+    const stopReason = toolCalls.length > 0 ? 'tool_use' : (data.choices[0]?.finish_reason ?? 'stop');
+
     return {
       content: data.choices[0]?.message?.content ?? '',
-      stopReason: 'stop',
+      stopReason,
       usage: {
         inputTokens: data.usage?.prompt_tokens ?? 0,
         outputTokens: data.usage?.completion_tokens ?? 0,
       },
+      ...(toolCalls.length > 0 ? { toolCalls } : {}),
     };
   }
 
@@ -107,15 +161,29 @@ export class LlamaCppClient implements ModelClient {
     }
 
     try {
+      const body: Record<string, unknown> = {
+        model: this.model,
+        messages,
+        max_tokens: request.maxTokens ?? 2048,
+        stream: true,
+      };
+
+      // Pass tool definitions to the API if provided
+      if (request.tools && request.tools.length > 0) {
+        body.tools = request.tools.map(t => ({
+          type: 'function' as const,
+          function: {
+            name: t.name,
+            description: t.description,
+            parameters: t.input_schema,
+          },
+        }));
+      }
+
       const response = await fetch(`${this.endpoint}/v1/chat/completions`, {
         method: 'POST',
         headers,
-        body: JSON.stringify({
-          model: this.model,
-          messages,
-          max_tokens: request.maxTokens ?? 2048,
-          stream: true,
-        }),
+        body: JSON.stringify(body),
       });
 
       if (!response.ok) {
@@ -131,6 +199,8 @@ export class LlamaCppClient implements ModelClient {
       const decoder = new TextDecoder();
       let buffer = '';
       let usage = { inputTokens: 0, outputTokens: 0 };
+      // Accumulate tool call deltas across streamed chunks
+      const toolCallAccumulators: Map<number, { id: string; name: string; arguments: string }> = new Map();
 
       while (true) {
         const { done, value } = await reader.read();
@@ -154,6 +224,22 @@ export class LlamaCppClient implements ModelClient {
               yield { type: 'content', content: chunk.choices[0].delta.content };
             }
 
+            // Accumulate tool call deltas from the stream
+            if (chunk.choices[0]?.delta?.tool_calls) {
+              for (const tc of chunk.choices[0].delta.tool_calls) {
+                if (!toolCallAccumulators.has(tc.index)) {
+                  toolCallAccumulators.set(tc.index, {
+                    id: tc.id ?? `llamacpp_tc_${tc.index}`,
+                    name: tc.function?.name ?? '',
+                    arguments: '',
+                  });
+                }
+                const acc = toolCallAccumulators.get(tc.index)!;
+                if (tc.function?.name) acc.name = tc.function.name;
+                if (tc.function?.arguments) acc.arguments += tc.function.arguments;
+              }
+            }
+
             if (chunk.usage) {
               usage = {
                 inputTokens: chunk.usage.prompt_tokens,
@@ -166,6 +252,18 @@ export class LlamaCppClient implements ModelClient {
         }
       }
 
+      // Yield completed tool calls before the done event
+      for (const [, acc] of toolCallAccumulators) {
+        yield {
+          type: 'tool_use',
+          toolCall: {
+            id: acc.id,
+            name: acc.name,
+            args: JSON.parse(acc.arguments),
+          },
+        };
+      }
+
       yield { type: 'done', usage };
     } catch (error) {
       yield {

src/models/local/ollama.test.ts

@@ -1,23 +1,29 @@
-import { describe, it, expect, vi } from 'vitest';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { OllamaClient } from './ollama.js';
 
+const mockChat = vi.fn();
+
 vi.mock('ollama', () => ({
   Ollama: vi.fn().mockImplementation(() => ({
-    chat: vi.fn().mockResolvedValue({
-      message: { content: 'Hello from Ollama!' },
-      done_reason: 'stop',
-      prompt_eval_count: 10,
-      eval_count: 5,
-    }),
+    chat: mockChat,
   })),
 }));
 
 describe('OllamaClient', () => {
+  beforeEach(() => {
+    mockChat.mockReset();
+  });
+
   it('sends messages and returns response', async () => {
-    const client = new OllamaClient({
-      model: 'llama3.2',
+    mockChat.mockResolvedValue({
+      message: { content: 'Hello from Ollama!' },
+      done_reason: 'stop',
+      prompt_eval_count: 10,
+      eval_count: 5,
     });
 
+    const client = new OllamaClient({ model: 'llama3.2' });
+
     const response = await client.chat({
       messages: [{ role: 'user', content: 'Hello' }],
     });
@@ -27,4 +33,205 @@ describe('OllamaClient', () => {
     expect(response.usage.inputTokens).toBe(10);
     expect(response.usage.outputTokens).toBe(5);
   });
+
+  it('passes tools to Ollama API in correct format', async () => {
+    mockChat.mockResolvedValue({
+      message: { content: 'I can help with that.' },
+      done_reason: 'stop',
+      prompt_eval_count: 15,
+      eval_count: 8,
+    });
+
+    const client = new OllamaClient({ model: 'llama3.2' });
+
+    await client.chat({
+      messages: [{ role: 'user', content: 'List files' }],
+      tools: [
+        {
+          name: 'shell.exec',
+          description: 'Execute a shell command',
+          input_schema: {
+            type: 'object',
+            properties: {
+              command: { type: 'string', description: 'The command to run' },
+            },
+            required: ['command'],
+          },
+        },
+      ],
+    });
+
+    expect(mockChat).toHaveBeenCalledWith(
+      expect.objectContaining({
+        tools: [
+          {
+            type: 'function',
+            function: {
+              name: 'shell.exec',
+              description: 'Execute a shell command',
+              parameters: {
+                type: 'object',
+                required: ['command'],
+                properties: {
+                  command: { type: 'string', description: 'The command to run' },
+                },
+              },
+            },
+          },
+        ],
+      }),
+    );
+  });
+
+  it('parses tool_calls from response', async () => {
+    mockChat.mockResolvedValue({
+      message: {
+        content: '',
+        tool_calls: [
+          { function: { name: 'shell.exec', arguments: { command: 'ls' } } },
+        ],
+      },
+      done_reason: 'stop',
+      prompt_eval_count: 12,
+      eval_count: 6,
+    });
+
+    const client = new OllamaClient({ model: 'llama3.2' });
+
+    const response = await client.chat({
+      messages: [{ role: 'user', content: 'List files' }],
+    });
+
+    expect(response.stopReason).toBe('tool_use');
+    expect(response.toolCalls).toHaveLength(1);
+    expect(response.toolCalls![0]).toEqual({
+      id: 'ollama_tc_0',
+      name: 'shell.exec',
+      args: { command: 'ls' },
+    });
+  });
+
+  it('handles thinking field from reasoning models', async () => {
+    mockChat.mockResolvedValue({
+      message: { content: '', thinking: 'Let me think...' },
+      done_reason: 'stop',
+      prompt_eval_count: 20,
+      eval_count: 15,
+    });
+
+    const client = new OllamaClient({ model: 'deepseek-r1' });
+
+    const response = await client.chat({
+      messages: [{ role: 'user', content: 'Solve this problem' }],
+    });
+
+    // When content is empty, thinking is used as fallback
+    expect(response.content).toBe('Let me think...');
+    expect(response.thinkingContent).toBe('Let me think...');
+  });
+
+  it('thinking field does not override existing content', async () => {
+    mockChat.mockResolvedValue({
+      message: { content: 'Final answer', thinking: 'Reasoning...' },
+      done_reason: 'stop',
+      prompt_eval_count: 20,
+      eval_count: 15,
+    });
+
+    const client = new OllamaClient({ model: 'deepseek-r1' });
+
+    const response = await client.chat({
+      messages: [{ role: 'user', content: 'Solve this problem' }],
+    });
+
+    expect(response.content).toBe('Final answer');
+    expect(response.thinkingContent).toBe('Reasoning...');
+  });
+
+  it('does not send tools when none provided', async () => {
+    mockChat.mockResolvedValue({
+      message: { content: 'No tools needed.' },
+      done_reason: 'stop',
+      prompt_eval_count: 5,
+      eval_count: 3,
+    });
+
+    const client = new OllamaClient({ model: 'llama3.2' });
+
+    await client.chat({
+      messages: [{ role: 'user', content: 'Hello' }],
+    });
+
+    const callArgs = mockChat.mock.calls[0][0];
+    expect(callArgs.tools).toBeUndefined();
+  });
+
+  it('streaming: yields content events', async () => {
+    mockChat.mockResolvedValue(
+      (async function* () {
+        yield { message: { content: 'Hello' }, done: false };
+        yield { message: { content: ' world' }, done: false };
+        yield { message: { content: '' }, done: true, prompt_eval_count: 10, eval_count: 5 };
+      })(),
+    );
+
+    const client = new OllamaClient({ model: 'llama3.2' });
+
+    const events: Array<{ type: string; content?: string; usage?: { inputTokens: number; outputTokens: number } }> = [];
+    for await (const event of client.chatStream({
+      messages: [{ role: 'user', content: 'Hello' }],
+    })) {
+      events.push(event);
+    }
+
+    expect(events).toHaveLength(3);
+    expect(events[0]).toEqual({ type: 'content', content: 'Hello' });
+    expect(events[1]).toEqual({ type: 'content', content: ' world' });
+    expect(events[2]).toEqual({
+      type: 'done',
+      usage: { inputTokens: 10, outputTokens: 5 },
+    });
+  });
+
+  it('streaming: yields tool_use events from final chunk', async () => {
+    mockChat.mockResolvedValue(
+      (async function* () {
+        yield {
+          message: {
+            content: '',
+            tool_calls: [
+              { function: { name: 'system.info', arguments: {} } },
+            ],
+          },
+          done: true,
+          prompt_eval_count: 5,
+          eval_count: 3,
+        };
+      })(),
+    );
+
+    const client = new OllamaClient({ model: 'llama3.2' });
+
+    const events: Array<{ type: string; toolCall?: { id: string; name: string; args: unknown }; usage?: { inputTokens: number; outputTokens: number } }> = [];
+    for await (const event of client.chatStream({
+      messages: [{ role: 'user', content: 'Get system info' }],
+    })) {
+      events.push(event);
+    }
+
+    // Should have tool_use event followed by done
+    expect(events).toHaveLength(2);
+    expect(events[0]).toEqual({
+      type: 'tool_use',
+      toolCall: {
+        id: 'ollama_tc_0',
+        name: 'system.info',
+        args: {},
+      },
+    });
+    expect(events[1]).toEqual({
+      type: 'done',
+      usage: { inputTokens: 5, outputTokens: 3 },
+    });
+  });
 });

src/models/local/ollama.ts

@@ -1,5 +1,5 @@
-import { Ollama } from 'ollama';
-import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient } from '../types.js';
+import { Ollama, type Tool } from 'ollama';
+import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient, ToolDefinition, ModelToolCall } from '../types.js';
 import { getMessageText } from '../media.js';
 
 export interface OllamaClientConfig {
@@ -21,6 +21,24 @@ export class OllamaClient implements ModelClient {
     this.numGpu = config.numGpu ?? -1;
   }
 
+  /**
+   * Convert Flynn ToolDefinition[] to Ollama Tool[] format.
+   */
+  private convertTools(tools: ToolDefinition[]): Tool[] {
+    return tools.map(t => ({
+      type: 'function',
+      function: {
+        name: t.name,
+        description: t.description,
+        parameters: {
+          type: t.input_schema.type,
+          required: t.input_schema.required,
+          properties: t.input_schema.properties as Record<string, any>,
+        },
+      },
+    }));
+  }
+
   async chat(request: ChatRequest): Promise<ChatResponse> {
     const messages: Array<{ role: 'system' | 'user' | 'assistant'; content: string }> = [];
 
@@ -32,21 +50,51 @@ export class OllamaClient implements ModelClient {
       messages.push({ role: msg.role, content: getMessageText(msg) });
     }
 
-    const response = await this.client.chat({
+    // Build the chat params, optionally including tools
+    const chatParams: Parameters<typeof this.client.chat>[0] = {
       model: this.model,
       messages,
       options: {
         num_gpu: this.numGpu,
       },
-    });
+    };
+
+    if (request.tools && request.tools.length > 0) {
+      chatParams.tools = this.convertTools(request.tools);
+    }
+
+    const response = await this.client.chat(chatParams);
+
+    // Extract content, checking for thinking field from reasoning models
+    let content = response.message.content;
+    let thinkingContent: string | undefined;
+    const thinking = (response.message as any).thinking;
+    if (thinking && typeof thinking === 'string') {
+      if (!content) {
+        // If no regular content, use thinking as content
+        content = thinking;
+      }
+      thinkingContent = thinking;
+    }
+
+    // Parse tool_calls from the response
+    const toolCalls: ModelToolCall[] = response.message.tool_calls?.map((tc, i) => ({
+      id: `ollama_tc_${i}`,
+      name: tc.function.name,
+      args: tc.function.arguments,
+    })) ?? [];
+
+    const hasToolCalls = toolCalls.length > 0;
 
     return {
-      content: response.message.content,
-      stopReason: response.done_reason ?? 'stop',
+      content,
+      stopReason: hasToolCalls ? 'tool_use' : (response.done_reason ?? 'stop'),
       usage: {
         inputTokens: response.prompt_eval_count ?? 0,
         outputTokens: response.eval_count ?? 0,
       },
+      ...(hasToolCalls ? { toolCalls } : {}),
+      ...(thinkingContent ? { thinkingContent } : {}),
     };
   }
 
@@ -62,6 +110,11 @@ export class OllamaClient implements ModelClient {
     }
 
     try {
+      // Build tools array if provided
+      const tools = request.tools && request.tools.length > 0
+        ? this.convertTools(request.tools)
+        : undefined;
+
       const stream = await this.client.chat({
         model: this.model,
         messages,
@@ -69,6 +122,7 @@ export class OllamaClient implements ModelClient {
         options: {
           num_gpu: this.numGpu,
         },
+        ...(tools ? { tools } : {}),
       });
 
       let inputTokens = 0;
@@ -79,6 +133,12 @@ export class OllamaClient implements ModelClient {
           yield { type: 'content', content: chunk.message.content };
         }
 
+        // Handle thinking field from reasoning models (e.g., deepseek-r1)
+        const thinking = (chunk.message as any)?.thinking;
+        if (thinking && typeof thinking === 'string') {
+          yield { type: 'content', content: thinking };
+        }
+
         if (chunk.prompt_eval_count) {
           inputTokens = chunk.prompt_eval_count;
         }
@@ -87,6 +147,22 @@ export class OllamaClient implements ModelClient {
         }
 
         if (chunk.done) {
+          // Handle tool_calls in the final chunk
+          const toolCalls = (chunk.message as any)?.tool_calls;
+          if (toolCalls && Array.isArray(toolCalls)) {
+            for (let i = 0; i < toolCalls.length; i++) {
+              const tc = toolCalls[i];
+              yield {
+                type: 'tool_use',
+                toolCall: {
+                  id: `ollama_tc_${i}`,
+                  name: tc.function.name,
+                  args: tc.function.arguments,
+                },
+              };
+            }
+          }
+
           yield {
             type: 'done',
             usage: {