{
  "model": "deepseek-default",
  "messages": [
    { "role": "user", "content": "查询北京今天的天气" }
  ],
  "tools": [
    {
      "type": "function",
      "function": {
        "name": "get_weather",
        "description": "获取指定城市的天气",
        "parameters": {
          "type": "object",
          "properties": {
            "city": { "type": "string", "description": "城市名" }
          },
          "required": ["city"]
        }
      }
    }
  ],
  "tool_choice": "required"
}