MCP Weather Server

import { z } from "zod"; import { WeatherAPI } from "../utils/api"; import { WeatherResponse } from "../types/weather"; export const weatherToolSchema = { city: z.string().describe("The city to get the weather for"), }; export async function getWeatherTool({ city, }: { city: string; }): Promise<WeatherResponse> { console.error( `[WeatherTool] ========== Starting weather request for: "${city}" ==========` ); try { // Get coordinates for the city console.error( `[WeatherTool] Step 1: Getting coordinates for city "${city}"` ); const coordinates = await WeatherAPI.getCoordinates(city); if (!coordinates) { console.error( `[WeatherTool] Failed to get coordinates for city: "${city}"` ); const errorResponse: WeatherResponse = { content: [ { type: "text" as const, text: `Could not find location for city: ${city}`, }, ], }; console.error( `[WeatherTool] Returning error response:`, JSON.stringify(errorResponse, null, 2) ); return errorResponse; } console.error( `[WeatherTool] Step 2: Successfully got coordinates, now fetching weather data` ); // Get weather data const weatherData = await WeatherAPI.getCurrentWeather( coordinates.latitude, coordinates.longitude ); if (!weatherData) { console.error( `[WeatherTool] Failed to get weather data for coordinates: lat=${coordinates.latitude}, lon=${coordinates.longitude}` ); const errorResponse: WeatherResponse = { content: [ { type: "text" as const, text: `Could not retrieve weather data for city: ${city}`, }, ], }; console.error( `[WeatherTool] Returning error response:`, JSON.stringify(errorResponse, null, 2) ); return errorResponse; } console.error( `[WeatherTool] Step 3: Successfully got weather data, preparing response` ); const responseText = `The current temperature in ${city} is ${weatherData.current_weather.temperature}°C with a wind speed of ${weatherData.current_weather.windspeed} km/h.`; console.error(`[WeatherTool] Generated response text: "${responseText}"`); const successResponse: WeatherResponse = { content: [ { type: "text" as const, text: responseText, }, ], }; console.error( `[WeatherTool] ========== Weather request completed successfully for: "${city}" ==========` ); return successResponse; } catch (error) { console.error( `[WeatherTool] Unexpected error during weather request for "${city}":`, error ); const errorResponse: WeatherResponse = { content: [ { type: "text" as const, text: `Could not retrieve weather data for city: ${city}`, }, ], }; console.error( `[WeatherTool] Returning error response due to exception:`, JSON.stringify(errorResponse, null, 2) ); return errorResponse; } }