# mcpgen: Turn any OpenAPI spec into an MCP server in seconds

> Source: <https://dev.to/56_princepal_a4d5346a99d/mcpgen-turn-any-openapi-spec-into-an-mcp-server-in-seconds-5cd7>
> Published: 2026-06-30 18:11:49+00:00

I got tired of manually writing MCP tools for every REST endpoint I wanted

to expose to an LLM. So I automated it.

**mcpgen** reads an OpenAPI JSON or YAML file and generates a complete,

ready‑to‑run MCP server in Python.

`snake_case`

names)`mcp`

and `httpx`

```
bash
pip install mcpgen
mcpgen my-api.json -o my-mcp-server
python my-mcp-server/server.py
The generated server runs over stdio – ready to plug into Claude Desktop
or any MCP client.

🧪 Real‑world test
Recently a contributor added an OpenAPI 3.1 fixture (Xquik API) with
lookupTweet and getUser endpoints. The tool generated the correct
tools, including path parameters and x-api-key auth, on the first try.

All 18 tests pass. It works.

🤔 Why you might want it
If you’re building LLM agents that need to interact with APIs,
mcpgen eliminates the boilerplate. You don’t have to write a single
@app.tool() decorator by hand.

It also makes it dead simple to experiment – change your API spec,
regenerate the server, and you’re done.

📦 Links
GitHub: JnanaSrota/mcpgen

PyPI: pip install mcpgen

MIT licensed, open to contributions

🙏 Feedback
If you try it with your own API spec and something breaks (or works
beautifully), I’d love to hear about it. Drop a comment or open an issue.

Thanks for reading!
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