basic-MCP

SkyH34D/basic-MCP

3.1

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This repository contains a minimal MCP server written in TypeScript, designed for quick local testing with Model Context Protocol clients.

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basic-mcp · Minimal MCP Server in TypeScript

Status: Proof of concept — designed for quick local testing with Model Context Protocol clients.

This repository contains a tiny MCP server written in TypeScript.
It publishes a single tool — fetch-weather — that returns a mock weather report for any city.
Use it to learn how transports, tools and schemas work with @modelcontextprotocol/sdk.

✨ Features

FeatureDescription
LightweightOne‑file implementation (main.ts).
Stdio transportCommunicates over standard I/O (perfect for piping into LLMs).
Zod validationStrongly‑typed parameters with runtime validation.
Mock weatherDemonstrates content blocks without external APIs.

🛠 Requirements

  • Node.js ≥ 18 (ESM & top‑level await support)
  • pnpm / npm / yarn to install dependencies
  • ts-node (optional) for dev mode

🚀 Quick start

# 1 — Clone
git clone https://github.com/SkyH34D/basic-mcp.git
cd first-mcp

# 2 — Install
pnpm install           # or: npm install / yarn install

# 3 — Run (non-sense, it's LLM's job)
npx -y tsx main.ts
# The server now listens on STDIN/STDOUT for MCP messages

Send a tool call such as:

{
  "tool": "fetch-weather",
  "params": { "city": "Madrid" }
}

and you’ll get:

{
  "content": [
    { "type": "text", "text": "The weather in Madrid is sunny." }
  ]
}

🗂 Project layout

basic-mcp/
├─ main.ts         # Main MCP server
├─ package.json
└─ pnpm-lock.yaml

🧩 How it works

  1. Instantiate McpServer with a name and version.
  2. Register the fetch-weather tool via server.tool(), providing:
    • A unique ID and description
    • A Zod schema for city
    • An async handler that returns a content array
  3. Create StdioServerTransport to use standard I/O.
  4. Connect with await server.connect(transport) and start listening.

📦 NPM scripts

ScriptRunsDescription
devts-nodeHot‑reload style development.
buildtscCompiles TypeScript into dist/.
startnodeExecutes the compiled build.

(Edit package.json to fit your tooling.)

📝 TODO / ideas

  • Replace the mock weather with a real API (e.g. OpenWeatherMap).
  • Add more tools — currency rates, timezone lookup, etc.
  • Switch to WebSocket/HTTP transport for remote use.
  • Write tests for tool handlers.

📄 License

MIT License. See for more information.