This is about breaking the habit of saying "done" before you've actually verified the work. It enforces a gate function: identify the verification command, run it fresh, read the full output, then and only then make your claim. Born from 24 failure memories where trust broke down because tests weren't run, builds weren't checked, or agent success reports were trusted without diff inspection. The tone is blunt because the problem it solves is endemic: fatigue, overconfidence, and "should work now" thinking that ships broken code. If you've ever had someone say "I don't believe you" after a completion claim, this codifies the discipline you actually need.
npx skills add https://github.com/sickn33/antigravity-awesome-skills --skill verification-before-completion