Installation

One command to install. No build step, no configuration, no peer dependencies.

Install

Deno (recommended)

deno add jsr:@casys/mcp-server

npm

npx jsr add @casys/mcp-server

Published on JSR, the modern JavaScript registry. Works with both Deno and Node.js.

Requirements

Runtime	Minimum Version
Deno	2.0+
Node.js	22+
TypeScript	5.0+ (recommended)

Verify it works

Create a server.ts file:

import { ConcurrentMCPServer } from "@casys/mcp-server";

const server = new ConcurrentMCPServer({
  name: "test",
  version: "0.0.1",
});

console.log("Ready — 0 tools registered, all systems go.");

Run it:

Deno

deno run --allow-net server.ts

Node.js

npx tsx server.ts

Tip

If you see the “Ready” message, you’re all set. Head to the Quick Start to build something real.

Next up

Build your first MCP server with a working tool in under a minute: Quick Start.