MCP Weather Server

Instructions

Implementation Reference

• tools/get_forcast.py:16-39 (handler)

  The handler function that implements the logic for the 'get_forecast' tool. It uses hardcoded weather data for a specific location and formats it into a string using the format_forecast helper.

  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
     """
  
     forecasts = [
     {
         "name": "This Afternoon",
         "temperature": "68°F",
         "wind": "18 mph WSW",
         "forecast": "Sunny. High near 68, with temperatures falling to around 66 in the afternoon. West southwest wind around 18 mph, with gusts as high as 23 mph."
     },
     {
         "name": "Tonight",
         "temperature": "55°F",
         "wind": "8 to 17 mph WSW",
         "forecast": "Mostly clear, with a low around 55. West southwest wind 8 to 17 mph, with gusts as high as 22 mph."
     },
    
     ]
       # Hardcode replace it with you api , you can call https://api.weather.gov ... 
     return format_forecast(forecasts)

• tools/get_forcast.py:15-16 (registration)

  The @mcp.tool() decorator registers the get_forecast function as an MCP tool within the register function.

  @mcp.tool()
  def get_forecast(latitude: float, longitude: float) -> str:

• weather.py:2-7 (registration)

  Imports the get_forcast module containing the tool definitions and calls its register(mcp) function to register the tools, including get_forecast, with the MCP server instance.

  from tools import get_forcast
  # Initialize FastMCP server
  mcp = FastMCP("weather")
  
  
  get_forcast.register(mcp)

• tools/get_forcast.py:43-50 (helper)

  Helper function used by get_forecast to format the list of forecast dictionaries into a human-readable string.

  def format_forecast(forecasts: List[Dict]) -> str:
          """
          Format a list of forecast dictionaries into a readable string.
          """
          return "\n---\n".join(
              f"{f['name']}:\nTemperature: {f['temperature']}\nWind: {f['wind']}\nForecast: {f['forecast']}"
              for f in forecasts
          )