feat(models): add tool use support to AnthropicClient

src/models/anthropic.ts

@@ -1,4 +1,5 @@
 import Anthropic from '@anthropic-ai/sdk';
+import type { Message } from '@anthropic-ai/sdk/resources/messages/messages.js';
 import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient } from './types.js';
 
 export interface AnthropicClientConfig {
@@ -23,7 +24,7 @@ export class AnthropicClient implements ModelClient {
   }
 
   async chat(request: ChatRequest): Promise<ChatResponse> {
-    const response = await this.client.messages.create({
+    const params: Record<string, unknown> = {
       model: this.model,
       max_tokens: request.maxTokens ?? this.defaultMaxTokens,
       system: request.system,
@@ -31,11 +32,21 @@ export class AnthropicClient implements ModelClient {
         role: m.role,
         content: m.content,
       })),
-    });
+    };
+
+    if (request.tools && request.tools.length > 0) {
+      params.tools = request.tools;
+    }
+
+    const response = await this.client.messages.create(params as unknown as Parameters<typeof this.client.messages.create>[0]) as Message;
 
     const textContent = response.content.find((c) => c.type === 'text');
     const content = textContent?.type === 'text' ? textContent.text : '';
 
+    const toolCalls = response.content
+      .filter((c): c is { type: 'tool_use'; id: string; name: string; input: unknown } => c.type === 'tool_use')
+      .map(c => ({ id: c.id, name: c.name, args: c.input }));
+
     return {
       content,
       stopReason: response.stop_reason ?? 'end_turn',
@@ -43,6 +54,7 @@ export class AnthropicClient implements ModelClient {
         inputTokens: response.usage.input_tokens,
         outputTokens: response.usage.output_tokens,
       },
+      ...(toolCalls.length > 0 ? { toolCalls } : {}),
     };
   }