Ask Claude if your idea is good and it tends to say yes. This free skill makes it argue with itself instead: a prosecutor, a defender, 12 jurors who vote blind, each judging as someone different, and a judge who hands down the verdict and the one change that would flip it.
idea-court.zipCustomize → Skills → + → Upload a skillunzip idea-court.zip -d ~/.claude/skills/One folder with a SKILL.md. Free, no sign-up. Upload it to Claude as it is.
The Prosecutor writes the 3 strongest, idea-specific reasons it fails. The Defender answers each one and adds the 2 best reasons it works. Then 12 jurors read both sides and vote GUILTY or NOT GUILTY without seeing each other's votes, so they can't just pile on. Each juror is a different person with skin in the game: the customer, the accountant, the competitor, the investor, the person who has to build it, your own future self and more. Finally the Judge counts the votes and gives a verdict.
Tip: There's no flattery anywhere in the skill on purpose. If you want encouragement, ask a friend. If you want the truth, ask the court.
Give it the idea in a sentence or two, who it's for, what they pay, and what success means to you in 6 months. If you leave something out, it asks once and then starts the trial.
Use idea-court. My idea: [idea]. It's for [who] and costs them [price]. Success in 6 months means [goal]. Run the full trial.
Tip: Works on more than startups: a career move, a video idea, a price change, a product name.
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