What's in it
Three steps, in order. How to ask questions that get you the truth instead of encouragement, where to look for proof that people already pay for this, and the cheapest thing you can do to get a real yes before you build anything.
Who it's for
Anyone who has opened a Stripe account for a product that doesn't exist yet. Anyone whose mum thinks the idea is wonderful. Anyone about to spend three months building before one stranger has said a word about it.
Test yourself
There's a companion quiz skill for Claude Code. Install it, then run /quiz-validation
and it'll ask you eight questions one at a time and score you at the end —
quiz-validation.
Print it
Three Letter pages. Stick it above the desk and read step one again the next time you catch yourself asking "would you use this?"