Your repo is already your agents' context, whether you designed it on purpose or not

That sentence took me a while to understand. In this post I'll save you the trip.

It was October 2025, working in Skyward's monorepo with AI agents every day. And every day the same routine: I'd tell the agent in the prompt "don't use this", "don't do it this way", "reuse the component that already exists". I wrote it down. I repeated it.

The agent did exactly what I told it not to do.

It wasn't that it didn't listen to me. It was that it read the code and saw something else there.