src/
├── index.ts    # Main entry point and Express server setup
├── server.ts   # MCP protocol handling and SSE transport layer
├── tools.ts    # Tool implementations and business logic
└── types.ts    # TypeScript type definitions

npm install

cp .env.example .env

PORT=3000
HOST=0.0.0.0
SERVER_NAME=mcp-express-server
SERVER_VERSION=1.0.0

npm run dev

npm run build

npm start

curl -X POST http://localhost:3000/message \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "initialize",
    "params": {
      "protocolVersion": "2024-11-05",
      "capabilities": {},
      "clientInfo": {
        "name": "test-client",
        "version": "1.0.0"
      }
    }
  }'

curl -X POST http://localhost:3000/message \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 2,
    "method": "tools/list"
  }'

curl -X POST http://localhost:3000/message \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 3,
    "method": "tools/call",
    "params": {
      "name": "add",
      "arguments": {
        "a": 5,
        "b": 3
      }
    }
  }'

export const availableTools: Tool[] = [
  // ... existing tools
  {
    name: 'your_tool',
    description: 'Description of your tool',
    inputSchema: {
      type: 'object',
      properties: {
        param1: {
          type: 'string',
          description: 'Parameter description'
        }
      },
      required: ['param1']
    }
  }
];

// Add implementation in executeTool function
case 'your_tool':
  return {
    content: [{
      type: 'text',
      text: `Result: ${args.param1}`
    }]
  };