# 02c Userconfig In Frontmatter

> References user_config.KEY in skill frontmatter hook. Validator may pass; /bin/sh should error with Bad substitution at hook execution time.

- Skill: `kazukinagata/02c-userconfig-in-frontmatter` (Agent Skill)
- Install (CLI): `npx skillmds@latest add kazukinagata/02c-userconfig-in-frontmatter`
- Raw SKILL.md: https://api.skillmd.com/api/skills/kazukinagata/02c-userconfig-in-frontmatter/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: kazukinagata (https://skillmd.com/u/kazukinagata)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/kazukinagata/02c-userconfig-in-frontmatter

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# 02c-userconfig-in-frontmatter (intentionally invalid)

このスキルは frontmatter hook で `${user_config.KEY}` を使い、`/bin/sh` レベルで `Bad substitution` エラーを発生させます。