Model Context Protocol (MCP) Server

This project implements a Model Context Protocol server using TypeScript and Express.js. It provides both HTTP and stdio-based transport layers for MCP communication.

Features

• Express.js based HTTP server implementation
• Stdio-based transport layer support
• Session management for client connections
• Built-in tools and resources:
  • Basic arithmetic operations
  • BMI calculator
  • Dynamic greeting generator
  • Weather data fetching (example of external API integration)

Prerequisites

• Node.js (Latest LTS version recommended)
• TypeScript
• npm or pnpm package manager

Installation

# Install dependencies
pnpm install

# Build the project
pnpm run build

Usage

Starting the HTTP Server

# Development mode with hot reload
pnpm run dev

# Production mode
pnpm start

The server will start on port 3000 by default.

Using the Stdio Transport

Run the stdio-based server:

ts-node stdio-index.ts

Project Structure

• index.ts - Main HTTP server implementation
• stdio-index.ts - Stdio transport implementation
• dist/ - Compiled JavaScript output
• tsconfig.json - TypeScript configuration

Available Tools

1. Addition Tool

   • Adds two numbers
   • Parameters: a and b (numbers)

2. BMI Calculator

   • Calculates Body Mass Index
   • Parameters: weightKg and heightM

3. Dynamic Greeting

   • Generates personalized greetings
   • Resource template: greeting://{name}

4. Weather Fetcher

   • Fetches weather data for a given city
   • Parameter: city (string)

Development

Building

pnpm run build

Running Tests

# Add test commands here once implemented

License

ISC