curl -LsSf https://astral.sh/uv/install.sh | shCopy

# 为我们的项目创建一个新目录
uv init weather
cd weather

# 创建虚拟环境并激活它
uv venv
source .venv/bin/activate

# 安装依赖项
uv add "mcp[cli]" httpx

# 创建我们的服务端文件
touch weather.pyCopy

    from typing import Any
    import httpx
    from mcp.server.fastmcp import FastMCP

    # 初始化FastMCP服务端
    mcp = FastMCP("weather")

    # 常量
    NWS_API_BASE = "https://api.weather.gov"
    USER_AGENT = "weather-app/1.0"Copy

    async def make_nws_request(url: str) -> dict[str, Any] | None:
        """向NWS API发出请求并进行适当的错误处理。"""
        headers = {
            "User-Agent": USER_AGENT,
            "Accept": "application/geo+json"
        }
        async with httpx.AsyncClient() as client:
            try:
                response = await client.get(url, headers=headers, timeout=30.0)
                response.raise_for_status()
                return response.json()
            except Exception:
                return None

    def format_alert(feature: dict) -> str:
    """Format an alert feature into a readable string."""
    props = feature["properties"]
    return f"""
Event: {props.get('event', 'Unknown')}
Area: {props.get('areaDesc', 'Unknown')}
Severity: {props.get('severity', 'Unknown')}
Description: {props.get('description', 'No description available')}
Instructions: {props.get('instruction', 'No specific instructions provided')}
"""Copy

    @mcp.tool()
    async def get_alerts(state: str) -> str:
        """获取美国州的天气警报。

        参数:
            state: 两个字母的美国州代码（例如CA, NY）
        """
        url = f"{NWS_API_BASE}/alerts/active/area/{state}"
        data = await make_nws_request(url)

        if not data or "features" not in data:
            return "无法获取警报或未找到警报。"

        if not data["features"]:
            return "该州没有活跃的警报。"

        alerts = [format_alert(feature) for feature in data["features"]]
        return "\n---\n".join(alerts)

    @mcp.tool()
    async def get_forecast(latitude: float, longitude: float) -> str:
        """获取某个位置的天气预报。

        参数:
            latitude: 位置的纬度
            longitude: 位置的经度
        """
        # 首先获取预测网格端点
        points_url = f"{NWS_API_BASE}/points/{latitude},{longitude}"
        points_data = await make_nws_request(points_url)

        if not points_data:
            return "无法获取该位置的预测数据。"

        # 从points响应中获取预测URL
        forecast_url = points_data["properties"]["forecast"]
        forecast_data = await make_nws_request(forecast_url)

        if not forecast_data:
            return "无法获取详细预测。"

        # 将时间段格式化为可读的预测
        periods = forecast_data["properties"]["periods"]
    forecasts = []
    for period in periods[:5]:  # Only show next 5 periods
        forecast = f"""
{period['name']}:
Temperature: {period['temperature']}°{period['temperatureUnit']}
Wind: {period['windSpeed']} {period['windDirection']}
Forecast: {period['detailedForecast']}
"""
            forecasts.append(forecast)

        return "\n---\n".join(forecasts)Copy

    if __name__ == "__main__":
        # 初始化并运行服务端
        mcp.run(transport='stdio')Copy

code ~/Library/Application\ Support/Claude/claude_desktop_config.jsonCopy

{
    "mcpServers": {
        "weather": {
            "command": "uv",
            "args": [
                "--directory",
                "/ABSOLUTE/PATH/TO/PARENT/FOLDER/weather",
                "run",
                "weather.py"
            ]
        }
    }
}Copy

    # 检查Claude的日志以查找错误
    tail -n 20 -f ~/Library/Logs/Claude/mcp*.logCopy