Updated 2d ago
by sx4im
skillcheck
Blind A/B testing for AI agent skills, .cursorrules, CLAUDE.md, and system prompts. Detects placebo and harmful instructions.
29 GitHub stars (29)
+1 in 20 days
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- 3 skills (3 skills found in its SKILL.md files)
- 6 forks (6 forks)
- 2d ago last update (Last updated 2d ago)
Install
Skills CLI
npx skills add sx4im/skillcheck
Asks which skills and agents to install. Just one: npx skills add sx4im/skillcheck --skill empty-skill — add -g for every project.
Claude Code
git clone https://github.com/sx4im/skillcheckcp -r "skillcheck/fixtures/m2/empty-skill" ~/.claude/skills/
Copies the empty-skill skill into ~/.claude/skills/ for every project (use .claude/skills/ for one project). Repeat for the other skills listed below.
Plugin
/plugin marketplace add sx4im/skillcheck
Run inside Claude Code if the repository ships a plugin marketplace, then pick plugins from /plugin.
Skills can run code on your machine — read the SKILL.md first.
What it does
In the author's own words, from each skill's SKILL.md.
-
empty-skill
empty SkillCheck M2 response rule control
fixtures/m2/empty-skill/SKILL.md on GitHub (opens in a new tab) -
strong-skill
private SkillCheck M2 response rule
fixtures/m2/strong-skill/SKILL.md on GitHub (opens in a new tab) -
rot-canary
rot detection canary
fixtures/m4/rot-canary/SKILL.md on GitHub (opens in a new tab)
No skill matches that filter.
Review before you install
A skill is a set of instructions and scripts your agent will follow, and it can run code on your machine. Read the SKILL.md and any scripts first — this listing is not a security review.
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