# Unexpected Fields > Test skill with unexpected fields in frontmatter Use when this capability is needed. - Skill: `tomevault-io/unexpected-fields` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/unexpected-fields` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/unexpected-fields/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/unexpected-fields --- # Test Skill - Unexpected Fields This fixture tests validation when unknown fields are present in the frontmatter. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/tcarac) — claim your Tome and manage your conversions.