Remote MCP Server (Authless)

import OAuthProvider from "@cloudflare/workers-oauth-provider"; import { McpAgent } from "agents/mcp"; import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; import { z } from "zod"; import { GoogleHandler, type GoogleOAuthProps } from "./google-handler"; // Props type for authenticated user information type Props = GoogleOAuthProps; // Define our MCP agent with tools export class MyMCP extends McpAgent<Env, {}, Props> { server = new McpServer({ name: "Authenticated Calculator", version: "1.0.0", }); async init() { // Simple addition tool this.server.tool( "add", { a: z.number(), b: z.number() }, async ({ a, b }) => ({ content: [{ type: "text", text: String(a + b) }], }), ); // Calculator tool with multiple operations this.server.tool( "calculate", { operation: z.enum(["add", "subtract", "multiply", "divide"]), a: z.number(), b: z.number(), }, async ({ operation, a, b }) => { let result: number; switch (operation) { case "add": result = a + b; break; case "subtract": result = a - b; break; case "multiply": result = a * b; break; case "divide": if (b === 0) return { content: [ { type: "text", text: "Error: Cannot divide by zero", }, ], }; result = a / b; break; } return { content: [{ type: "text", text: String(result) }] }; }, ); // Tool to get current user info (demonstrates auth context usage) this.server.tool("whoami", {}, async () => { const userInfo = this.props; if (!userInfo || !userInfo.email) { return { content: [{ type: "text", text: "Not authenticated" }], }; } return { content: [ { type: "text", text: `Authenticated as: ${userInfo.name} (${userInfo.email})`, }, ], }; }); } } // Export with OAuthProvider wrapping the MCP handlers export default new OAuthProvider({ apiHandlers: { "/sse": MyMCP.serveSSE("/sse"), "/mcp": MyMCP.serve("/mcp"), }, defaultHandler: GoogleHandler, authorizeEndpoint: "/authorize", tokenEndpoint: "/token", clientRegistrationEndpoint: "/register", });