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skillcheck-free
olgasafonova/SkillCheck-FreePlugin
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, Claude Desktop/Web (Projects), and Cursor. The Free tier covers structural, semantic, and naming checks plus quality-pattern recognition. SkillCheck Pro (separate product at getskillcheck.com) adds anti-slop detection, security scanning, token budget analysis, WCAG accessibility, and enterprise readiness checks.
Why this score
Popularity score: 63/100 from public GitHub signals only. It shows how widely used and maintained this is, not how well it works. Not included yet: the fake-star check. The security scan is shown separately and doesn't change the score. How we rank
Security
Scanned Oct 22, 2026 at commit 05d33856da5e, with Cisco's open-source skill-scanner.
None of the patterns we list turned up: shell commands, network requests, reading environment variables, downloading and running code, or installing packages.
A scan lists patterns in the code. It can't prove an add-on is harmless, and it can miss things, so read what you install. How we scan
Alternatives
Other makers' add-ons that do the same job, next to this one.
| Name | Score | Stars | Context | Updated |
|---|---|---|---|---|
| This oneskillcheck-free olgasafonova/SkillCheck-Free · Plugin | 63 | ★ 42 | not measured | 24d ago |
| Arc Free Skills ArcHelps/systems-engineering-skills · MCP server Both about free | 48 | ★ 13 | not measured | 1mo ago |
| free-tool-strategy TheCraigHewitt/seomachine · Skill Both about free | 79 | ★ 7.5k | ≈111 always | 20d ago |
| cell-free-expression adaptyvbio/protein-design-skills · Skill Both about free | 51 | ★ 168 | ≈23 always | 5mo ago |