What Kills It — Ruthless Plan Grill

Most AI agents cheer you on. This one doesn't.

What Kills It turns your agent into a tough, honest reviewer. You bring a plan, idea, business, trading strategy, spec or code before you build it. The skill interviews you, finds the real holes, and names the single thing most likely to kill it.

How it works — six passes:

1. Pin it down — forces you to say exactly what you're building, for whom, and what "it worked" means as a number.
2. Find the holes — hidden costs, cherry-picked winners, overfitting ("works in the demo"), missing edge cases, unchecked assumptions, and who already does this.
3. How will you know? — demands a frozen metric, a baseline to beat, out-of-sample testing and results net of real cost.
4. What kills it — the single most likely failure, plus the next two, ranked.
5. The cheapest test — the smallest experiment that proves or kills the idea in a day, not a quarter.
6. Verdict — Go / No-go / Fix-first, in one line.

Why use it:

• Separates VERIFIED facts from ASSUMED ones.
• No flattery, no "great idea!" — but kind to the person, hard on the work.
• If your idea is actually solid, it says so. It doesn't invent problems.
• Bilingual: replies in the language you write in (English or Spanish).

Built by Matías De Virgiliis, a futures trader, from his hard-won rule: measure honestly, never sell hope, find what kills it before you build it.