Claude Code + /prove-it-better = AI That PROVES It's Better (FREE Skill)

A new model comes out every few weeks and every one claims to be better. AI sounds just as confident when it's wrong. So how do you actually know a change made your code, your prompts or your app better? I built a free Claude Code skill for exactly that: /prove-it-better. It makes every change prove itself before it ships. How it works: 1. Checks it has access to everything it needs 2. Researches the problem and the real data before touching anything 3. Writes the ship rule first, then builds the new version behind a switch 4. Runs old vs new on the same real inputs, with a blind judge: outp