#!/usr/bin/env node
/**
 * Example MCP Server
 * 
 * This is a minimal MCP server demonstrating the structure.
 * Replace with your actual MCP server implementation.
 */

const { Server } = require('@modelcontextprotocol/sdk/server/index.js');
const { StdioServerTransport } = require('@modelcontextprotocol/sdk/server/stdio.js');

const server = new Server(
  {
    name: 'example-mcp-server',
    version: '1.0.0',
  },
  {
    capabilities: {
      tools: {},
    },
  }
);

// Register example tool
server.setRequestHandler('tools/list', async () => {
  return {
    tools: [
      {
        name: 'example_tool',
        description: 'An example tool that echoes input',
        inputSchema: {
          type: 'object',
          properties: {
            message: {
              type: 'string',
              description: 'Message to echo',
            },
          },
          required: ['message'],
        },
      },
    ],
  };
});

server.setRequestHandler('tools/call', async (request) => {
  if (request.params.name === 'example_tool') {
    const message = request.params.arguments?.message || 'Hello, World!';
    return {
      content: [
        {
          type: 'text',
          text: `Echo: ${message}`,
        },
      ],
    };
  }
  throw new Error(`Unknown tool: ${request.params.name}`);
});

// Start server
async function main() {
  const transport = new StdioServerTransport();
  await server.connect(transport);
  console.error('Example MCP server running on stdio');
}

main().catch(console.error);