# Skillcheck Free

> SkillCheck Free validates Claude Code SKILL.md files against ~25 contract rules covering structure, naming, semantic consistency, and quality patterns. It catches missing frontmatter, weak or ambiguous descriptions, trigger collisions, anti-pattern formatting (prose where tables belong), naming smells, and contradictions before users encounter them. Runs locally — it's itself a SKILL.md the agent reads, with no API calls, binaries, or external services. MIT-licensed. Works in Claude Code, Claud

## Facts
- Page: https://tashan.sh/capability/plugin-olgasafonova-skillcheck-free-skillcheck-free
- tashan id: plugin:olgasafonova/skillcheck-free/skillcheck-free
- Source: https://github.com/olgasafonova/SkillCheck-Free
- Type: plugin
- Category: other
- tashan score: 47.0 / 100
- Adoption: 27.0
- Upkeep: 71.0
- Freshness: 77.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: solid
- GitHub stars: 35
- License: MIT
- Official: no

## Install

```sh
/plugin marketplace add anthropics/claude-plugins-community
/plugin install skillcheck-free@claude-community
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-09-13 by tashan (https://tashan.sh) from public evidence. Scorer s5.