天气警报工具

mcpcrashcourse/
├── server/
│   └── weather.py         # MCP server logic (get_alerts)
├── pyproject.toml         # Project metadata + dependencies
├── uv.lock                # Locked versions (auto-generated by uv)
└── README.md              # You're reading it!

@mcp.tool()
async def get_alerts(state: str) -> list[dict]:
    # Fetch weather alerts for a given U.S. state (e.g., 'CA')
    url = "https://api.weather.gov/alerts/active"
    params = {"area": state.upper()}
    async with httpx.AsyncClient() as client:
        response = await client.get(url, params=params)
        data = response.json()

    return [
        {
            "event": alert.get("event"),
            "severity": alert.get("severity"),
            "description": alert.get("description"),
            "instruction": alert.get("instruction"),
        }
        for alert in data.get("features", [])
        if alert.get("properties")
    ]

pipx install uv               # install uv if you haven't
uv init mcpcrashcourse        # start new project
cd mcpcrashcourse
uv add "mcp[cli]" httpx       # add dependencies

uv run mcp dev server/weather.py

{
  "mcpServers": {
    "weather": {
      "command": "uv",
      "args": [
        "run",
        "--with",
        "mcp[cli]",
        "mcp",
        "run",
        "<your-project-directory>/server/weather.py"
      ]
    }
  }
}