sample-mcp-server

sample-mcp-server

A minimal MCP server demo in Python that exposes five tools for arithmetic and a simulated long-running process.

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README

AI MCP Tools

A lightweight local MCP server demo built in Python.

This repository contains a small set of tool definitions for mcp, showing how to expose simple operations through a local MCP server and manage the environment with uv.

What this repo contains

  • main.py: a minimal MCP server with five tools:
    • add(a, b)
    • subtract(a, b)
    • multiply(a, b)
    • divide(a, b)
    • long_process(steps)
  • MCP.md: notes on MCP architecture and the main components of the protocol.
  • pyproject.toml, uv.lock, and .venv/: the source configuration and environment state created through uv.

Why this setup

I used uv to initialize and manage the Python environment, keep dependencies locked, and keep the repo light and reproducible. The goal is a clean, easy-to-run demo rather than a copied template.

Getting started

  1. Create or activate the virtual environment:

    uv venv .venv
.\.venv\Scripts\Activate.ps1

  2. Install dependencies:

    uv install

  3. Run the MCP server locally:

    mcp dev main.py

Notes

  • The repository is designed for local development and experimentation with MCP tools.
  • uv.lock stores the exact dependency versions, so the environment can be reproduced.
  • .gitignore excludes the virtual environment and Python cache files.

Quick commands

  • uv init — initialize the project config with uv (already done)
  • uv install — install packages and update the lock file
  • uv venv .venv — create the local virtual environment
  • mcp dev main.py — start the MCP tool server

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