Node Server

A TypeScript server implementing a simple Model Context Protocol (MCP) — a true "Hello World" example to help you understand how an MCP server works. This project includes basic features such as:

• Handling JSON-RPC requests
• Example tools like add-number and greet
• Support for Server-Sent Events (SSE) for real-time communication
• Simple client and server code for easy testing and learning

Prerequisites

• Node.js (v20 or higher)
• npm (comes with Node.js)
• Cursor IDE (recommended)

Installation

1. Clone the repository:

git clone [email protected]:mateusdata/mcp-mateusdata-server.git
cd mcp-mateusdata-server

2. Install dependencies:

npm install

Running the Project

Development mode:

npm run dev

For build and production run:

npm run build
npm start

Adding the MCP Server in Cursor

In the Cursor configuration file, add:

{
  "mcpServers": {    
  "mateusdata-mcp-server": {
   "command": "node",      
   "args": ["path/to/mcp-mateusdata-server/build/index.js"]
  }
  }
}

Project Structure

mcp-mateusdata-server/
├── build/         # Compiled JavaScript files
├── src/           # Source code
    └── server.ts  # Simple MCP server example
│   └── client.js  # Simple MCP client example
├── node_modules/  # Project dependencies
├── package.json   # Project configuration and dependencies
└── tsconfig.json  # TypeScript configuration

About

This repository demonstrates a minimal implementation of the Model Context Protocol (MCP). The src/client.js file provides an example of how a client can interact with the server, useful for testing and initial learning.

Usage Examples

You can interact with the MCP server directly from your terminal using Bash, Zsh, or Fish. For example, to list available tools:

To call the tool "add-number" with values a = 3 and b = 5:

echo '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"add-number","arguments":{"a":3,"b":5}}}' | node build/index.js

To call the "greet" tool with the parameter nome = "Mateus":

echo '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"greet","arguments":{"name":"Mateus"}}}' | node build/index.js

Using SSE (Server-Sent Events) with the MCP Server

You can interact with the MCP server using SSE for real-time communication. Start the server:

node build/index.js sse

You should see:

MCP Server running with SSE on http://localhost:8765/sse

Connecting to the SSE endpoint

In a new terminal, connect using curl:

curl http://localhost:8765/sse

Example output:

event: endpoint
data: /messages?sessionId=d9bfe7df-937c-475e-8d80-904a99f9ef4d

Sending a message to the server

Copy the sessionId from the previous output and use it to send a request:

curl -X POST http://localhost:8765/messages \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"greet","arguments":{"name":"Mateus"}}}'

The server will respond via the SSE connection with the result of your request.

This project is licensed under the MIT License.