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使用 Cline 和 MCP 进行天气工具调用

一个小型 Python MCP 服务器,可让 LLM 获取真实的天气数据。

用户在 Cline 中提出天气问题。LLM 决定是否调用天气工具,生成所需的参数,并将请求发送到此服务器。服务器从 US National Weather Service (NWS) 获取数据,然后 LLM 使用结果编写最终回答。

工作原理

User question
    -> Cline sends the question and tool definitions to the LLM
    -> The LLM selects a weather tool and generates its arguments
    -> Cline calls the Python MCP server
    -> The server fetches real data from api.weather.gov
    -> The LLM turns the tool result into a natural-language answer

Related MCP server: Weather MCP Server

技术栈

  • Python 3.14

  • MCP Python SDK

  • Cline 作为 MCP 客户端和 LLM 宿主

  • OpenRouter 搭配 DeepSeek 模型用于演示

  • HTTPX

  • US National Weather Service API

  • uv

工具

get_forecast

获取美国某地点的未来五个预报时段。

{
  "latitude": 40.7128,
  "longitude": -74.006
}

get_alerts

获取美国某州当前生效的天气警报。

{
  "state": "NY"
}

设置

要求:

  • Python 3.14

  • uv

  • 安装了 Cline 的 Visual Studio Code

  • 在 Cline 中配置的、支持工具调用的 LLM 的 API 密钥

安装项目:

git clone <https://github.com/yang648557392/weather-mcp-tool-calling.git>
cd weather
uv sync

将 MCP 服务器添加到 Cline 的 MCP 设置中。将路径替换为此项目的绝对路径:

{
  "mcpServers": {
    "weather": {
      "command": "uv",
      "args": ["--directory", "/absolute/path/to/weather", "run", "weather.py"],
      "disabled": false
    }
  }
}

在 Cline 中重启 MCP 服务器。Cline 应自动发现 get_forecastget_alerts

如果 Cline 找不到 uv,请将 "uv" 替换为以下命令返回的绝对路径:

which uv

用法

向 Cline 提出一个类似这样的问题:

What will the weather be like in New York tomorrow?
Are there any active weather alerts in California?

Cline 会显示所选工具、其参数、工具结果以及 LLM 的最终回复。

局限性

  • NWS API 仅支持美国气象服务覆盖的地点。

  • LLM 负责将地名转换为坐标。

  • 必须以 Cline 作为 LLM 宿主和 MCP 客户端。

  • 提供商的 API 密钥存储在 Cline 中,不得提交到此仓库。

作者

Mingzhe Yang

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