We built the one analysis in our product where a fact about YOU can kill the idea outright

We built the one analysis in our product where a fact about YOU can kill the idea outright, and I want to write down what that cost, because it is the part nobody discusses.

Founder-market fit normally arrives as credentials — build in a domain you know — or as encouragement. Neither can be acted on. The decidable version is narrower: can you build this, explain it, sell it and support it, for this specific buyer and this specific job.

7 checks, none about a CV. A decade in an adjacent industry earns nothing here on its own.

The check nobody has considered: can you tell whether the output is good. Plenty of buildable products fail there. You ship it and have no way to know if what it produced was right, so you cannot improve it and cannot defend it when a customer says it is wrong.

The bottom rung of the ladder is a hard kill on the idea, and it is not one of the softenable filters. Because that is a strong thing for a tool to do, it comes with an obligation: it must cite a specific thing YOU said about yourself in your own profile. Not a vibe about the domain being hard.

The design choice I would defend hardest: a mediocre fit does not subtract points across the whole scorecard. It caps the one category it has business affecting and leaves the rest of the evaluation to the idea. Otherwise founder-fit quietly becomes a mood filter on everything.

And the thing that surprised me most about our own output: the plain-English recommendation beats the score. A drop recommendation lands on the same decision at every rung, including the top one. If the analysis says in words this is not your idea, letting a good number outvote it would be laundering a judgement through arithmetic.

Two rules that came out of a live evaluation going wrong. It must not invent attributes about you — the first run asserted a founder had a low tolerance for something their profile never mentioned, which is convincing precisely because it sounds like a reasonable inference. And every gap must be searchable: Stripe billing webhooks, not fintech compliance.

Also banned in the output: motivational language, and coaching of any kind — no mentors, no advisors, no get a co-founder. All real options, none of them an answer to whether you can sell this next month.

The ladder and the rules: https://whittleos.com/guides/am-i-the-right-founder-for-this-idea