getWeather
Retrieve current weather conditions for any city using the OpenWeatherMap API. Provide a city name to get temperature, humidity, and other weather data.
Instructions
Get current weather for a city
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| city | Yes | Name of the city |
Implementation Reference
- index.js:12-41 (handler)Core handler logic for fetching weather data from OpenWeatherMap API, formatting response as MCP content, and handling errors.
async getWeather(city) { if (!this.apiKey) { throw new Error('OPENWEATHER_API_KEY environment variable is not set'); } try { const response = await axios.get( `https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${this.apiKey}&units=metric` ); const data = response.data; return { content: [{ type: 'text', text: JSON.stringify({ city: data.name, temperature: data.main.temp, description: data.weather[0].description, }, null, 2), }], }; } catch (error) { return { content: [{ type: 'text', text: `Error: ${error.message}`, }], isError: true, }; } } - index.js:52-57 (registration)Registers the 'getWeather' tool with the MCP server, including description, input schema, and an inline handler that delegates to WeatherService.getWeather.
server.registerTool('getWeather', { description: 'Get current weather for a city', inputSchema: { city: z.string().describe('Name of the city'), }, }, async ({ city }) => await weatherService.getWeather(city)); - index.js:54-56 (schema)Zod input schema defining the 'city' parameter as a required string.
inputSchema: { city: z.string().describe('Name of the city'), }, - index.js:7-42 (helper)WeatherService class providing the getWeather method and managing the OpenWeather API key.
class WeatherService { constructor(apiKey = process.env.OPENWEATHER_API_KEY) { this.apiKey = apiKey; } async getWeather(city) { if (!this.apiKey) { throw new Error('OPENWEATHER_API_KEY environment variable is not set'); } try { const response = await axios.get( `https://api.openweathermap.org/data/2.5/weather?q=${city}&appid=${this.apiKey}&units=metric` ); const data = response.data; return { content: [{ type: 'text', text: JSON.stringify({ city: data.name, temperature: data.main.temp, description: data.weather[0].description, }, null, 2), }], }; } catch (error) { return { content: [{ type: 'text', text: `Error: ${error.message}`, }], isError: true, }; } } }