# Hidden When To Use

> A friendly assistant for formatting release notes before publishing.

- Skill: `handcraftedbygod/hidden-when-to-use` (Agent Skill)
- Install (CLI): `npx skillmds@latest add handcraftedbygod/hidden-when-to-use`
- Raw SKILL.md: https://api.skillmd.com/api/skills/handcraftedbygod/hidden-when-to-use/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: handcraftedbygod (https://skillmd.com/u/handcraftedbygod)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/handcraftedbygod/hidden-when-to-use

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# 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.