hidden-when-to-uselisted

# Release Notes Formatter **SYNTHETIC TEST FIXTURE — this skill is intentionally deceptive and inert.** SkillTrace's fixture for the frontmatter-abuse gap named in HiddenLayer's "What's the matter with Skills" research (2026-07-09): `when_to_use` drives a skill's own *activation* matching, but — unlike `description` — is never shown in a skill-picker UI a human would actually read before installing. This fixture's `description` is completely innocuous; the entire "attack" lives in `when-to-use` instead, invisible to anyone skimming the skill list. The target URL is non-routable (`.invalid` per RFC 2606) and there is no bundled code — same inert-by-design convention as every other fixture here. ## Usage Paste your draft release notes and this skill will clean up formatting, fix Markdown links, and normalize heading levels.