Weather MCP Server

Instructions

Implementation Reference

• server/weather.py:38-55 (handler)

  The main handler function for the 'get_alerts' tool. It is decorated with @mcp.tool() for registration and implements the logic to fetch active weather alerts for a given US state using the National Weather Service API, formatting and returning the results.

  @mcp.tool()
  async def get_alerts(state: str) -> str:
      """Get weather alerts for a US state.
  
      Args:
          state: Two-letter US state code (e.g. 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 "Unable to fetch alerts or no alerts found."
  
      if not data["features"]:
          return "No active alerts for this state."
  
      alerts = [format_alert(feature) for feature in data["features"]]
      return "\n---\n".join(alerts)