# Non Standard Fields

> Use when you need to test a skill with non-spec frontmatter fields.

- Skill: `8ddiehu0314/non-standard-fields` (Agent Skill)
- Install (CLI): `npx skillmds@latest add 8ddiehu0314/non-standard-fields`
- Raw SKILL.md: https://api.skillmd.com/api/skills/8ddiehu0314/non-standard-fields/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: 8ddieHu0314 (https://skillmd.com/u/8ddiehu0314)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/8ddiehu0314/non-standard-fields

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This skill uses frontmatter fields that are not in the Agent Skills spec.
Custom data should live inside the `metadata:` map, not at the top level.

Expected failure: structure.standard-frontmatter-fields [moderate]