WeatherMCP

Instructions

Args:
    latitude: Latitude of the location
    longitude: Longitude of the location

Implementation Reference

• weather.py:59-93 (handler)

  The handler function for the 'get_forecast' tool, decorated with @mcp.tool() for registration. It fetches the weather forecast for given latitude and longitude using the National Weather Service API, formats the next 5 periods, and returns a formatted string.

  @mcp.tool()
  async def get_forecast(latitude: float, longitude: float) -> str:
      """Get weather forecast for a location.
  
      Args:
          latitude: Latitude of the location
          longitude: Longitude of the location
      """
      # First get the forecast grid endpoint
      points_url = f"{NWS_API_BASE}/points/{latitude},{longitude}"
      points_data = await make_nws_request(points_url)
  
      if not points_data:
          return "Unable to fetch forecast data for this location."
  
      # Get the forecast URL from the points response
      forecast_url = points_data["properties"]["forecast"]
      forecast_data = await make_nws_request(forecast_url)
  
      if not forecast_data:
          return "Unable to fetch detailed forecast."
  
      # Format the periods into a readable forecast
      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)