prove-it

Use when investigating a root-cause claim for a past failure; checking a claim that a reported failure cannot be reproduced; reviewing a PR, diff, proposal or contract for concrete defects; verifying a live status or metric before reporting it; verifying an Android license-tester purchase; verifying time-windowed usage or billing queries; reconciling conflicting readings; judging parse or validation failures after a truncated or bounded read; or checking that a resource or bug is absent. Use deliver-and-verify to publish or arm a PR. Use unblock to restore currently failing work and challenge to compare designs. Full-read parse errors need no truncation investigation. Static general knowledge, arithmetic and routine acknowledgements do not need this skill.