skill-check
Validate Claude Code skills against the agentskills specification. Catches structural, semantic, and naming issues before users do.
Profile →npx skills add sickn33/agentic-awesome-skills --skill skill-check --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# SkillCheck ## Overview Validate SKILL.md files against the [agentskills specification](https://agentskills.io) and Anthropic best practices. Catches structural errors, semantic contradictions, naming anti-patterns, and quality gaps in a single read-only pass. ## When to Use This Skill - Use when user says "check skill", "skillcheck", or "validate SKILL.md" - Use when reviewing a skill before publishing to a marketplace - Use when debugging why a skill doesn't trigger correctly - Use when onboarding a team to skill authoring standards - Do NOT use for anti-slop detection, security scanning, or token analysis; use [SkillCheck Pro](https://getskillcheck.com) for those ## How It Works ### Step 1: Parse Read the target SKILL.md file and extract YAML frontmatter. ### Step 2: Validate Apply all Free tier checks in order: | Category | Checks | What it catches | |----------|--------|----------------| | Structure (1.x) | Name format, description WHAT+WHEN, allowed-tools, categories, XML injection | Malformed frontmatter, missing fields | | Body (2.x) | Line count, hardcoded paths, stale dates, empty sections, deprecated syntax, MCP tool qualification | Content quality issues | | Naming (3.
- Overview
- When to Use This Skill
- How It Works
- Step 1: Parse
- Step 2: Validate
- Step 3: Score
- Step 4: Report
- Examples
- Example 1: Validating a skill
- Example 2: Clean skill passes all checks
- Limitations
- Best Practices
- Common Pitfalls
What does the skill-check skill do?
Validate Claude Code skills against the agentskills specification. Catches structural, semantic, and naming issues before users do.
How do I install it?
Run `npx skills add sickn33/agentic-awesome-skills --skill skill-check --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From sickn33/agentic-awesome-skills, a repository with 44,414 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.