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Anvil & Code — Free
Rewrites SKILL.md description fields to maximize triggering reliability. The description is the single highest-leverage line in any skill — it determines whether Claude uses the skill at all. This tool scores your current description and generates 3 optimized variants with a clear recommendation.
Skills don't fail because the instructions are bad. They fail because Claude never reads them. Claude decides whether to consult a skill in milliseconds, based entirely on the description field. A weak description = an invisible skill.
- Download
SKILL.mdfrom this package - Go to claude.ai → Projects → your project
- Click Add content and upload
SKILL.md - Paste your skill's description and say: "Optimize this description"
- Score of your current description (X/15 across 5 dimensions)
- One-sentence diagnosis of the weakest point
- 3 variants: Comprehensive, Tight, Discovery-optimized
- Score table comparing all variants to your current description
- Clear recommendation with one-sentence reason
- Variants formatted ready to paste into YAML
skill-validator and description-optimizer are permanently free from Anvil & Code.
Get the Engineer's Edition — all 12 skills →
Anvil & Code — Production-grade Claude skills for builders.