Validate Claude Code skills against Anthropic guidelines. Use when user says "check skill", "skillcheck", "validate SKILL.md", or asks to find issues in skill definitions. Covers structural and semantic validation. Do NOT use for anti-slop detection, security scanning, token analysis, enterprise checks, or Eval Kit generation; use skill-check-pro for those.
Install
npx skills add olgasafonova/SkillCheck-Free --skill skill-checknpx skills add olgasafonova/SkillCheck-Free --skill skill-check -a claude-code -gnpx skills add olgasafonova/SkillCheck-Free --skill skill-check -a codex -ggemini skills install https://github.com/olgasafonova/SkillCheck-Free.git --path skills/skill-checkgh skill install olgasafonova/SkillCheck-Free skill-checkgit clone --depth 1 https://github.com/olgasafonova/SkillCheck-Free /tmp/olgasafonova__SkillCheck-Free
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/olgasafonova__SkillCheck-Free/skills/skill-check ~/.claude/skills/skill-check # Claude Code
cp -R /tmp/olgasafonova__SkillCheck-Free/skills/skill-check ~/.agents/skills/skill-check # Codex, Cursor, Gemini CLI, Copilot, OpenCode