index.ts•1.77 kB
#!/usr/bin/env node
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import {
CallToolRequestSchema,
ListToolsRequestSchema,
} from "@modelcontextprotocol/sdk/types.js";
/**
* Create an MCP server with custom tools
*/
const server = new Server(
{
name: "mcp-server",
version: "0.1.0",
},
{
capabilities: {
tools: {},
},
}
);
/**
* Handler for listing available tools
*/
server.setRequestHandler(ListToolsRequestSchema, async () => {
return {
tools: [
{
name: "echo",
description: "Echoes back the input message",
inputSchema: {
type: "object",
properties: {
message: {
type: "string",
description: "The message to echo back",
},
},
required: ["message"],
},
},
],
};
});
/**
* Handler for tool execution
*/
server.setRequestHandler(CallToolRequestSchema, async (request) => {
const { name, arguments: args } = request.params;
if (name === "echo") {
if (!args || typeof args !== "object") {
throw new Error("Invalid arguments");
}
const message = String(args.message);
return {
content: [
{
type: "text",
text: `Echo: ${message}`,
},
],
};
}
throw new Error(`Unknown tool: ${name}`);
});
/**
* Start the server using stdio transport
*/
async function main() {
const transport = new StdioServerTransport();
await server.connect(transport);
console.error("MCP Server running on stdio");
}
main().catch((error) => {
console.error("Fatal error in main():", error);
process.exit(1);
});