#!/usr/bin/env node
// Simple echo MCP server example
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { ListToolsRequestSchema, CallToolRequestSchema } from "@modelcontextprotocol/sdk/types.js";
const server = new Server(
{
name: "echo-server",
version: "1.0.0",
},
{
capabilities: {
tools: {},
},
}
);
// Simple echo tool
server.setRequestHandler(ListToolsRequestSchema, async () => {
return {
tools: [
{
name: "echo",
description: "Echo back the input",
inputSchema: {
type: "object",
properties: {
message: { type: "string", description: "Message to echo" },
},
required: ["message"],
},
},
],
};
});
server.setRequestHandler(CallToolRequestSchema, async (request) => {
if (request.params.name === "echo") {
const message = request.params.arguments?.message || "No message provided";
return {
content: [
{
type: "text",
text: `Echo: ${message}`,
},
],
};
}
throw new Error(`Unknown tool: ${request.params.name}`);
});
async function main() {
const transport = new StdioServerTransport();
await server.connect(transport);
console.error("Echo MCP server running");
}
main().catch(console.error);
