I built a tool that won't let you merge AI-written code until you can explain it

The problem

AI agents like Claude Code and Codex write code fast. You run it, it works, you merge. A week later, there's a bug — and you realize you never actually understood the code you shipped. You just transcribed it.

This is "vibe coding," and it's becoming the default way a lot of us write software now.

What I built

BuildIt is a set of hands-on courses where an AI agent proposes code changes like a normal diff — but you can't move to the next step until you explain, in an actual conversation with an AI tutor, why the change was made and what could go wrong. You also write the prompt yourself before the AI generates anything.