Proof · Drafts
Evidence-first drafts: stop inventing product facts
PostKeel Editorial · 2026-07-15 · 6 min read
Why PostKeel only asserts numbers and claims you have confirmed — and turns everything else into an add-a-fact ask.
Most AI writing tools will invent a plausible percentage if you leave a hole in the brief. That feels fast until a customer, journalist, or regulator asks where the number came from.
PostKeel takes the opposite posture. Generation may only assert a specific fact — a number, date, percentage, customer name, or comparative claim — if it maps to a currently valid row in your evidence ledger. Otherwise the draft emits an explicit add-a-fact marker and stops hedging.
What counts as evidence
- A claim you confirmed in Proof, with a source you can defend.
- Facts pulled from your Brand Brain interview when you marked them verified.
- Nothing scraped from someone else’s posts, and nothing “probably true.”
Fulfilling an add-a-fact request rewrites only the affected sentence — not the whole draft.
Why this belongs in the product, not a style guide
A style guide that says “don’t invent stats” fails the first busy afternoon. Enforcement has to sit in the generation path and in the cards you publish. Stat and quote cards read from the same ledger — they cannot display an unverified number.
If you are evaluating PostKeel against generic AI writers, this is the guarantee to pressure-test first. Ask for a draft that needs a metric you have not confirmed. You should see an ask, not a confident lie.
PostKeel
How we think about proof, safety, and a daily marketing loop — without inventing product facts.