Why I'm building a place to practice catching AI's bugs (opens in new tab)

Two moments made me start building Loupe. Neither was some grand realization — they were just things that kept happening until I couldn't ignore them. The first happened several times a day. I'd hand a feature to my AI coding agent — Claude Code, Codex, whichever — and minutes later it would come back: done, tests passing. Green checkmarks everywhere. But when I actually read what it had written, I kept noticing the same thing: the tests weren't written to check the feature. They were written...