SkillCheck-Free
mcp
Gecti
Health Gecti
- License — License: MIT
- Description — Repository has a description
- Active repo — Last push 0 days ago
- Community trust — 17 GitHub stars
Code Gecti
- Code scan — Scanned 4 files during light audit, no dangerous patterns found
Permissions Gecti
- Permissions — No dangerous permissions requested
Purpose
This tool validates AI coding assistant skills against the open agentskills specification. It checks YAML frontmatter, trigger conditions, and instruction clarity to ensure compatibility across platforms like Claude Code, Cursor, and Claude Projects.
Security Assessment
The overall risk is rated as Low. The tool is essentially a static text checker that reads local SKILL.md files. It does not make external network requests, does not access sensitive user data, and does not require any dangerous system permissions. A light code audit of its shell scripts found no dangerous patterns, hidden executables, or hardcoded secrets.
Quality Assessment
The project appears healthy and legitimate. It is actively maintained (last updated today) and uses the highly permissive MIT license. It has garnered 17 GitHub stars, showing a baseline of community trust. The repository documentation is clear and straightforward, outlining exactly how to install and use the tool without requiring complex dependencies or opaque binaries.
Verdict
Safe to use.
This tool validates AI coding assistant skills against the open agentskills specification. It checks YAML frontmatter, trigger conditions, and instruction clarity to ensure compatibility across platforms like Claude Code, Cursor, and Claude Projects.
Security Assessment
The overall risk is rated as Low. The tool is essentially a static text checker that reads local SKILL.md files. It does not make external network requests, does not access sensitive user data, and does not require any dangerous system permissions. A light code audit of its shell scripts found no dangerous patterns, hidden executables, or hardcoded secrets.
Quality Assessment
The project appears healthy and legitimate. It is actively maintained (last updated today) and uses the highly permissive MIT license. It has garnered 17 GitHub stars, showing a baseline of community trust. The repository documentation is clear and straightforward, outlining exactly how to install and use the tool without requiring complex dependencies or opaque binaries.
Verdict
Safe to use.
Validate Claude Code skills against the agentskills specification (Free tier)
README.md
SkillCheck Free
Validate AI coding assistant skills against the agentskills specification. Works with Claude Code, Claude Desktop/Web, and Cursor. Catch issues before your users do.
Why SkillCheck?
Agent Skills are now an open standard adopted by Claude Code, Cursor, and dozens of coding agents. Your skill needs to work everywhere and follow best practices.
SkillCheck validates:
- Does the YAML frontmatter follow the spec?
- Will it trigger when users actually need it?
- Are the instructions clear and unambiguous?
Installation
Claude Code
Copy the skill-check folder to your Claude Code skills directory:
cp -r skill-check ~/.claude/skills/
Or clone directly:
git clone https://github.com/olgasafonova/SkillCheck-Free.git
cp -r SkillCheck-Free/skill-check ~/.claude/skills/
Claude Desktop/Web (Projects)
- Open claude.ai or Claude Desktop app
- Create a new Project (or open an existing one)
- Go to Project settings → Custom instructions
- Copy the contents of
skill-check/SKILL.md(everything after the---frontmatter) - Paste into the custom instructions field
No file installation needed - the skill runs directly from your Project instructions.
Cursor
Copy the rule file to your project's .cursor/rules directory:
mkdir -p .cursor/rules
cp cursor-rules/skill-check.mdc .cursor/rules/
Or clone directly:
git clone https://github.com/olgasafonova/SkillCheck-Free.git
mkdir -p .cursor/rules
cp SkillCheck-Free/cursor-rules/skill-check.mdc .cursor/rules/
Usage
In Claude Code, Claude Desktop/Web, or Cursor, say any of:
- "skillcheck my skill"
- "check skill at path/to/SKILL.md"
- "validate my skills"
Example Output
## SkillCheck Results: my-awesome-skill
### Summary
- Critical: 1 | Warnings: 2 | Suggestions: 3 | Passed: 44
### Critical Issues
**[1.2-desc-what]** Line 3: Description missing action verb
**Fix**: Start description with Create, Generate, Build, Convert, etc.
### Warnings
**[4.2-ambiguous-term]** Line 47: Vague term "several" found
**Fix**: Specify exact count or range
### Strengths
- Skill includes example section
- Skill documents prerequisites
- Description includes activation triggers
What It Checks
Structure (1.x)
| Check | What It Catches |
|---|---|
| 1.1-name | Invalid name format, reserved words |
| 1.2-desc | Missing or weak description (WHAT verb + WHEN trigger recommended) |
| 1.3-tools | Unknown or deprecated tool formats |
| 1.4-category | Invalid category format |
| 1.9-xml | XML angle brackets in frontmatter (prompt injection risk) |
| 1.9-arg-hints | Missing argument-hint in frontmatter when $ARGUMENTS is used |
| 1.10-readme | README.md inside skill folder (docs belong in SKILL.md) |
Body (2.x)
| Check | What It Catches |
|---|---|
| 2.1-lines | File too long (500+ lines warning) |
| 2.3-date | Hardcoded dates that will go stale |
| 2.4-empty | Empty sections with no content |
| 2.8-antipattern-format | Anti-pattern sections using prose instead of tables/bullets |
| 2.9-mcp-tool-unqualified | Unqualified MCP tool names missing server prefix |
Naming (3.x)
| Check | What It Catches |
|---|---|
| 3.1-vague | Generic names like "helper", "utils" |
| 3.2-length | Names too short or too long |
| 3.3-single | Single-word names lacking specificity |
| 3.4-gerund | Gerund naming ("writing-helper" instead of verb-noun) |
Semantic (4.x)
| Check | What It Catches |
|---|---|
| 4.1-contradiction | Conflicting instructions |
| 4.2-ambiguous | Vague terms like "several", "appropriate" |
| 4.3-output | Output mentioned but no format specified |
| 4.6-wisdom | Generic advice/platitudes instead of actionable instructions |
| 4.7-desc-workflow-steps | Description summarizes workflow steps (causes agents to skip body) |
Design Pattern Classification (19.x)
SkillCheck classifies each skill into one of five design patterns from the Google ADK taxonomy:
| Pattern | What It Means | Example Skills |
|---|---|---|
| Reviewer | Evaluates output against criteria | skill-check, code-review |
| Generator | Produces structured artifacts from templates | linkedin-post, brand-assets |
| Inversion | Asks user questions before acting | grill-me, feature-scoping |
| Pipeline | Chains multiple steps with checkpoints | sift, tapestry |
| Tool Wrapper | Wraps an API with context-aware instructions | lmwtfy |
Pro adds deep checks: validates pattern-specific requirements (criteria for Reviewers, output specs for Generators, etc.).
Quality Patterns (8.x) - Strengths
SkillCheck also recognizes good practices:
| Check | What It Recognizes |
|---|---|
| 8.1 | Has example section |
| 8.2 | Documents error handling or limitations |
| 8.3 | Description includes activation triggers |
| 8.4 | Specifies output format with examples |
| 8.5 | Uses structured instructions (numbered steps) |
| 8.6 | Documents prerequisites |
| 8.7 | Includes negative triggers to prevent over-triggering |
| 8.8 | Uses ${CLAUDE_SKILL_DIR} for portable path references |
Severity Levels
| Level | Meaning | Action |
|---|---|---|
| Critical | Skill may not function | Must fix |
| Warning | Best practice violation | Should fix |
| Suggestion | Could be improved | Nice to have |
| Strength | Good practice detected | Keep it up |
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| Structure validation | Yes | Yes |
| Body & naming checks | Yes | Yes |
| Semantic consistency | Yes | Yes |
| Quality patterns | Yes | Yes |
| Design Pattern Classification | Detection | Deep checks |
| Artifact Contract Validation | - | Yes |
| Trigger Collision Detection | - | Yes |
| Eval Kit (test prompt generation) | - | Yes |
| Anti-slop detection | - | Yes |
| Security scanning | - | Yes |
| Token budget analysis | - | Yes |
| WCAG accessibility | - | Yes |
| Enterprise readiness | - | Yes |
| Production readiness | - | Yes |
| Agent Readiness (L0-L3) | - | Yes |
| MCP server integration | - | Yes |
| CI/CD binary | - | Yes |
Get Pro: getskillcheck.com
Prerequisites
- Claude Code (or any AI assistant with file Read capability)
- Works on macOS, Linux, Windows
- No dependencies required
How It Works
SkillCheck Free is itself a skill/rule file. When you say "skillcheck", your AI assistant reads the validation rules and applies them to your target skill. No external API calls, no binaries - just your assistant following instructions.
Contributing
Found a bug or have a suggestion? Open an issue at github.com/olgasafonova/SkillCheck-Free/issues
Links
- Website: getskillcheck.com
- Specification: agentskills.io
- Pro version: SkillCheck Pro
License
MIT - see LICENSE
Built by Olga Safonova
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