Checking Skill Best Practices

Evaluates a skill against the latest official guidelines from Anthropic. Always fetches current documentation to ensure accurate, up-to-date assessment.

When to Use

• Reviewing skill quality before finalization
• User asks to check compliance with best practices
• Improving or refactoring existing skills

Evaluation Process

1. Fetch Latest Guidelines

Start here every time:

fetch_webpage("https://platform.claude.com/docs/en/agents-and-tools/agent-skills/best-practices")

Extract current evaluation criteria from the fetched content.

2. Read Target Skill

read_file(".claude/skills/[skill-name]/SKILL.md")

3. Evaluate Against Fetched Guidelines

Compare skill against criteria from the documentation:

• Core principles (conciseness, appropriate freedom, testing)
• Skill structure (frontmatter, naming, description)
• Content guidelines (terminology, time-sensitivity, patterns)
• Anti-patterns to avoid

4. Generate Report

Provide structured findings with specific recommendations:

Evaluation Report Template

## Skill Evaluation: [skill-name]

**Overall Score**: X/10
**Guideline Version**: [Date from fetched doc]

### ✅ Strengths
- [What follows best practices]

### ⚠️ Issues Found

#### Critical (Must Fix)
- [ ] [Issue with specific fix]

#### Recommended (Should Fix)
- [ ] [Improvement suggestion]

### 🔧 Actionable Steps
1. [Highest priority fix]
2. [Next improvement]

### 📚 Reference
[Relevant sections from fetched documentation]

Usage Example

User: "Check if adding-new-metric follows best practices"

1. fetch_webpage(best-practices-url)
   → Extract current criteria

2. read_file(".claude/skills/adding-new-metric/SKILL.md")
   → Get skill content

3. Compare against extracted criteria:
   - Name format (gerund form?)
   - Description quality (what + when?)
   - Conciseness (≤500 lines?)
   - Progressive disclosure used?
   - Consistent terminology?

4. Generate report with specific fixes

Key Evaluation Areas

From the fetched documentation, focus on:

Critical:

• YAML frontmatter correctness
• Naming convention compliance
• Description effectiveness

Important:

• Conciseness (every token justified?)
• Progressive disclosure (reference files?)
• Consistent terminology

Code-specific (if applicable):

• Unix-style paths
• Error handling
• MCP tool naming

Iteration Pattern

1. Evaluate → 2. Report issues → 3. Apply fixes → 4. Re-evaluate

Use multireplacestringinfile for efficient corrections.