Anvil & Code — Free
Audits SKILL.md files for structural issues, missing fields, weak triggering descriptions, and marketplace-readiness. Returns a scored report with a specific fix for every issue found.
Most Claude skills don't fail because the instructions are bad. They fail because:
- The description is too short or too vague to trigger reliably
- Required fields are missing from the frontmatter
- The output format is never specified, so Claude invents one
- Placeholder text was never replaced
The validator catches all of this before you ship.
- Download
SKILL.mdfrom this package - Go to claude.ai → Projects → your project
- Click Add content and upload
SKILL.md - Paste your skill file into a chat and say: "Validate this skill"
A scored report (0–10) with:
- Critical issues — things that will break the skill entirely
- Warnings — things that will make the skill unreliable
- Triggering score (X/9) — the single most important metric
- What's working well — so you know what not to change
- Recommended next step — one clear action, not a list of ten
skill-validator and description-optimizer are permanently free from Anvil & Code.
Good tools make the whole ecosystem better.
Anvil & Code — Production-grade Claude skills for builders.