feat: 支持通过环境变量配置工具模型

Co-authored-by: aider (vertex_ai/gemini-2.5-pro) <aider@aider.chat>

Author: Dango233

packages/mcp-server/src/index.ts

@@ -134,6 +134,16 @@ async function startMcpServer() {
   await config.refreshAuth(selectedAuthType);
   console.log(`Using authentication method: ${selectedAuthType}`);
 
+  // Check for the custom tools model environment variable
+  const toolsDefaultModel = process.env.GEMINI_TOOLS_DEFAULT_MODEL;
+  if (toolsDefaultModel && toolsDefaultModel.trim() !== '') {
+    config.setModel(toolsDefaultModel.trim());
+    console.log(`🚀 Using custom model for tools: ${toolsDefaultModel.trim()}`);
+  } else {
+    // Log the default model being used if the environment variable is not set
+    console.log(`⚙️  Using default model for tools: ${config.getModel()}`);
+  }
+
   // 4. 初始化并启动 MCP 桥接服务 和 OpenAI 服务
   const mcpBridge = new GcliMcpBridge(config, cliVersion);