Skill Reviewer

Purpose

It performs hard validation of required frontmatter rules and a best-practices review of the SKILL content. It outputs a checklist-style report suitable for pasting into a PR comment.

When to use

• You're creating or modifying a skill and want a consistent quality review.
• You want to validate naming/description conventions and catch issues early.

Example - How to invoke

Ask the agent to run this skill and provide the target path, for example:

• "Use skill-reviewer to review skills/<skill-name>/SKILL.md."
• "Review skills/<skill-name>/SKILL.md and display the checklist report."

Inputs

• targetSkillMdPath (required): repository-relative path to the skill's SKILL.md (e.g., skills/my-skill/SKILL.md).

Output

• A checklist-style report.
• Each checklist item has:
  • status: pass | can improve | fail
  • severity: high | medium | low
  • For any can improve or fail: a brief, actionable suggestion.

Scope and constraints

• Only review SKILL.md files within this repository.
• DO NOT create or modify files unless the user explicitly asks.

Scoring guidance

• Only high-severity items may be marked fail. All other issues should be can improve.
• If any high-severity item is fail, the overall result must be ❌ NEEDS_CHANGES.
• Otherwise the overall result should be ✅ PASS.

Checklist items to output

Output only the checklist items that are not pass (i.e., can improve or fail), and include the evidence for each item. Sort items by severity (high → medium → low) and then by type (fail before can improve).

For example:

• [fail] (high) Frontmatter is missing

  • Evidence: No YAML block at the top of the file.

• [can improve] (medium) Description explains what + when to use

  • Suggestion: Description should also explain when to use the skill, not just what it does.

Hard validations checklist (high severity)

• Frontmatter exists and parses as YAML.
• Frontmatter has name (string).
• Frontmatter has description (string).
• name matches parent directory name.
• name is unique in **/SKILL.md.
• name length ≤ 64.
• name matches ^[a-z0-9-]+$.
• name contains no XML tags.
• name contains no reserved words (anthropic, claude).
• description is non-empty.
• description length ≤ 1024.
• description contains no XML tags.
• Referenced files (if any) exist and are within the repository, unless they reference node_modules.

Best practices checklist (low/medium severity - never fail)

• Description is under 400 lines. (low)
• Examples, if present, are concrete. (low)
• Workflows, if present, have ordered steps. (low)
• File references are one level deep where practical. (low)
• Description explains what + when to use. (medium)
• Description is specific and includes key terms. (medium)
• Heading hierarchy is logical. (medium)
• Description uses progressive disclosure for complex topics, and details live in supporting files. (medium)
• Prefer scripts stored as separate files (e.g., scripts/) rather than embedded long code blocks. (medium)
• Validation/verification steps exist for critical operations. (medium)
• Terminology is consistent throughout (same term used for same concept). (medium)
• Avoid extraneous docs (README/INSTALLATION_GUIDE/etc). (medium)
• No Windows-style paths in examples. (medium)
• No unexplained "magic constants" in instructions or code snippets; values are named or justified. (medium)
• Any required packages/tools are listed and there is a quick verification step. (medium)

Report format (copy/paste friendly)

Produce the report in this exact general structure:

Skill review:

Summary

• Result: <PASS | NEEDS_CHANGES>
• Fail (high):
• Can improve:

Checklist

• [<pass|can improve|fail>] (<high|medium|low>)
  • Evidence: <short, specific observation>
  • Suggestion: <only for can improve / fail>

When citing evidence, prefer short excerpts, avoid dumping large chunks of the SKILL content.