Reply rate only resolves at ~1500–2000 sends per variant, subject-line opens at 100–500 per variant, delivery and text sanity-check at 50–100 — and that last one is not a verdict on your offer, only on whether the mail arrives. A negative read at 20 sends is noise wearing a conclusion's clothes, and the decision it triggers (rewrite the offer, drop the channel) usually costs more than finishing the test would have. The skill is one file of exactly these thresholds, so your agent stops declaring verdicts on data that cannot carry them. Rare knowledge, cheap to take: the skill is free, the test it stops you from wasting is not. Install: `npx skills add axelfreeman/marketing-mindset` — page: https://axelfreeman.github.io/marketing-mindset/ — what is the smallest sample you have ever let yourself call a verdict on?