工具调用

{
  "model": "glm-5.3",
  "messages": [{"role":"user","content":"北京天气怎么样"}],
  "tools": [{
    "type": "function",
    "function": {
      "name": "get_weather",
      "description": "查询城市天气",
      "parameters": {
        "type": "object",
        "properties": {"city": {"type": "string"}},
        "required": ["city"]
      }
    }
  }]
}