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This tutorial walks you through the smallest useful hosted Redop server.

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What you will build

By the end, you will have:
  • an HTTP Redop server
  • one simple health tool
  • one tool with input
  • a working MCP endpoint at /mcp

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Step 1: Create the server

import { Redop } from "@redopjs/redop";

const app = new Redop({
  serverInfo: {
    name: "hello-redop",
    title: "Hello Redop",
    version: "0.1.0",
  },
});

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Step 2: Add a no-input tool

app.tool("ping", {
  description: "Health check",
  handler: () => ({ pong: true, ts: Date.now() }),
});

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Step 3: Add a tool with input

app.tool("echo", {
  description: "Echo a message",
  inputSchema: {
    type: "object",
    properties: {
      message: { type: "string" },
    },
    required: ["message"],
  },
  handler: ({ input }) => ({
    message: input.message,
  }),
});

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Step 4: Start HTTP

app.listen(3000);

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Step 5: Run and verify

bun run src/index.ts
Then connect a client to http://localhost:3000/mcp.

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What to do next

Now that the transport works, add a schema so the handler input becomes typed.