21d • 📘 Tutorials & Guides
Build an MCP Server in Python (full walkthrough)
I just published a full walkthrough on building an MCP server in Python from scratch.
If you haven't touched MCP yet — it's simpler than it sounds. An MCP server is a JSON-RPC service that exposes tools to Claude. You define functions, Claude discovers them, picks the right one based on context, and your code runs. That's the entire pattern.
Python is the fastest path to a working server. The FastMCP library gets you from zero to a running server in about 30 lines. You define a tool with a decorator, add a description so Claude knows when to use it, and start the server. Done.
The pattern looks like this:
- You write Python functions and mark them as tools
- Claude connects to your server and sees what's available
- When a user asks something relevant, Claude calls your tool automatically
- Your code runs, returns results, Claude uses them in its response
No middleware. No routing logic. No prompt engineering to get Claude to use your tool — it just works because MCP is a standard protocol that Claude speaks natively.
I built my first MCP server to pull YouTube analytics. Took about an hour from "what is MCP" to "Claude is reading my channel stats." The second one took 20 minutes. Once you see the pattern, you can wrap any API or script as a tool Claude can use.
The walkthrough covers setup, tool definitions, testing locally, and connecting to Claude Code.
Full post here: https://kjetilfuras.com/build-mcp-server-in-python/
Full code in the post. Drop questions below.
0
0 comments
Build an MCP Server in Python (full walkthrough)
skool.com/build-automate
Build autonomous AI agents with Claude Code & OpenClaw. Real configs, build logs, and a practitioner community that actually ships.
Powered by