Build your own MCP server

Installing connectors is the easy half. Nobody is ever going to ship one for your booking system.

That rota tool a contractor built you in 2022 with no public API. Your pricing engine. The table where the money actually lives. Those are the things you want Claude touching, and those are exactly the things no connector exists for.

So you write the server yourself. It is about sixty lines.

Expose tools, not endpoints, because the model reads names and picks under uncertainty,
Six clear tools beat forty-one overlapping ones, every time,
Write descriptions for a stranger with no access to your code,
Return an id and a summary, never fifty full records,
Write errors that tell the agent what to try next 🔥

The guide has a complete working server you can copy and run, two tools with their schemas, and the local config to wire it up.

Free. No email wall.

Comment "BUILD" 👇 and I'll send it to your DMs.