I built this entire thing with Claude Code but with hands fully on keyboard. But the button, the Redis-backed leaderboards, the milestone facts, all of it is agentically generated. It's absurdly similar to the loop of PRD > ask engineer > provide feedback, but a strange version with less typing, more directing, and a surprising amount of "wait, why is that broken" followed by "oh, that's why."

The best bug: for a good while, none of the toast messages or the confetti actually had their styling applied. Astro's CSS scoping quietly requires an attribute that elements created on the fly in JavaScript never get, so everything was rendering as plain, unstyled text and I didn't notice for an embarrassingly long stretch. There was also a brief period where the leaderboard had genuinely incorrect test data sitting on it, because I kept testing against the real production database instead of a sandbox. Both are fixed now. Mostly, though, this was a lot of "try this," "no, smaller," "add a fake crisis when someone hits #1" — and here we are!