My MCP Weather Server

This project is an example of an MCP (Model Context Protocol) server built with the @modelcontextprotocol/sdk for TypeScript. It demonstrates how to expose a simple tool that provides dummy weather information for a few predefined cities.

This server is intended to be used as a backend for an MCP-compliant client, such as an LLM-powered agent that can leverage the tools exposed by this server.

Features

• MCP Compliant: Implements the Model Context Protocol.
• Streamable HTTP Transport: Uses the recommended StreamableHTTPServerTransport for communication.
• Tool Exposure: Exposes a get_city_weather tool.
  • Input: city (string, e.g., "paris", "london", "tokyo") and optional unit (enum: "metric" or "imperial", defaults to "metric").
  • Output: Returns dummy weather information including temperature, description, and humidity.
  • Structured Output: Provides structuredContent matching a defined outputSchema for reliable parsing by clients.
• Basic Session Management: Demonstrates simple in-memory session handling for StreamableHTTPServerTransport.

Prerequisites

• Node.js (v18 or higher recommended, as per MCP SDK)
• npm (or yarn/pnpm)

Setup

1. Clone the repository (or create the project files):

   # If you have it in a git repo:
   # git clone <your-repo-url>
   # cd my-mcp-weather-server
   
   # Otherwise, ensure you have the project directory with src/server.ts, package.json, tsconfig.json
   

2. Install dependencies:

   npm install
   

Running the Server

For Development

This command uses ts-node to run the TypeScript source directly and nodemon to automatically restart the server on file changes.

npm run build
npm start