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strict-missing-section
Perform strict-mode checks on a skill whose body omits the When NOT to Use section. Everything else about the body is fine, the description is long enough, opens with an action verb, and includes a Not for anti-trigger. The one failure this fixture isolates is the missing When-NOT-to-Use heading which is the single most commonly skipped authoring convention.
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.