Stateless MCP | muppet

When working with Stateless MCP Servers, you can just create a single instance of StreamableHTTPTransport and connect it to your MCP server, once. This allows you to handle all incoming requests without needing to redo the connection for each request.

import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StreamableHTTPTransport } from "@hono/mcp";
import { Hono } from "hono";

const app = new Hono();
const mcpServer = new McpServer({
	name: "my-mcp-server",
	version: "1.0.0",
});

const transport = new StreamableHTTPTransport();

let isConnected = false;
const connectedToServer = mcpServer.connect(transport).then(() => {
	isConnected = true;
});

app.all("/mcp", async (c) => {
	if (!isConnected) await connectedToServer;
	return transport.handleRequest(c);
});

export default app;