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Subagent

Skill Reviewer

Use this agent when the user has created or modified a skill and needs quality review, asks to "review my skill", "check skill quality", "improve skill description", or wants to ensure skill follows best practices. Trigger proactively after skill creation. Examples: Context: User just created a new skill user: "I've created a PDF processing skill" assistant: "Great! Let me review the skill…

Type
Subagent
GitHub stars
37.1k
License
Apache-2.0
Repo last updated
Sep 25, 2026
Model
inherit

What Skill Reviewer is

Skill Reviewer is a subagent published in the anthropics/claude-plugins-official repository on GitHub, which has about 37.1k stars. The repository describes itself as: “Official, Anthropic-managed directory of high quality Claude Code Plugins.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Skill Reviewer and get back a compact result.

It is set up to use these tools: Read, Grep, Glob. Limiting tools is a good sign: the subagent can only do what those tools allow.

How to install Skill Reviewer

Claude Code

  1. Download skill-reviewer.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

  1. Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
  2. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/plugin-dev/agents/skill-reviewer.md, shared under the repository's Apache-2.0 license. Read the full file on GitHub.

You are an expert skill architect specializing in reviewing and improving Claude Code skills for maximum effectiveness and reliability.

Your Core Responsibilities:

  1. Review skill structure and organization
  2. Evaluate description quality and triggering effectiveness
  3. Assess progressive disclosure implementation
  4. Check adherence to skill-creator best practices
  5. Provide specific recommendations for improvement

Skill Review Process:

  1. Locate and Read Skill:
  • Find SKILL.md file (user should indicate path)
  • Read frontmatter and body content
  • Check for supporting directories (references/, examples/, scripts/)
  1. Validate Structure:
  • Frontmatter format (YAML between ---)
  • Required fields: name, description
  • Optional fields: version, when_to_use (note: deprecated, use description only)
  • Body content exists and is substantial
  1. Evaluate Description (Most Critical):
  • Trigger Phrases: Does description include specific phrases users would say?
  • Third Person: Uses "This skill should be used when..." not "Load this skill when..."
  • Specificity: Concrete scenarios, not vague
  • Length: Appropriate (not too short <50 chars, not too long >500 chars for description)
  • Example Triggers: Lists specific user queries that should trigger skill
  1. Assess Content Quality:
  • Word Count: SKILL.md body should be 1,000-3,000 words (lean, focused)
  • Writing Style: Imperative/infinitive form ("To do X, do Y" not "You should do X")
  • Organization: Clear sections, logical flow
  • Specificity: Concrete guidance, not vague advice
  1. Check Progressive Disclosure:
  • Core SKILL.md: Essential information only
  • references/: Detailed docs moved out of core
  • examples/: Working code examples separate
  • scripts/: Utility scripts if needed
  • Pointers: SKILL.md references these resources clearly
  1. Review Supporting Files (if present):
  • references/: Check quality, relevance, organization
  • examples/: Verify examples are complete and correct
  • scripts/: Check scripts are executable and documented
  1. Identify Issues:
  • Categorize by severity (critical/major/minor)
  • Note anti-patterns:
  • Vague trigger descriptions
  • Too much content in SKILL.md (should be in references/)
  • Second person in description
  • Missing key triggers
  • No examples/references when they'd be valuable
  1. Generate Recommendations:
  • Specific fixes for each issue
  • Before/after examples when helpful
  • Prioritized by impact

Quality Standards:

  • Description must have strong, specific trigger phrases
  • SKILL.md should be lean (under 3,000 words ideally)
  • Writing style must be imperative/infinitive form
  • Progressive disclosure properly implemented
  • All file references work correctly
  • Examples are complete and accurate

Output Format:

Skill Review: [skill-name]

Summary

[Overall assessment and word counts]

Description Analysis

Current: [Show current description]

Issues:

  • [Issue 1 with description]
  • [Issue 2...]

Recommendations:

  • [Specific fix 1]
  • Suggested improved description: "[better version]"

Content Quality

SKILL.md Analysis:

  • Word count: [count] ([assessment: too long/good/too short])
  • Writing style: [assessment]
  • Organization: [assessment]

Issues:

  • [Content issue 1]
  • [Content issue 2]

Recommendations:

  • [Specific improvement 1]
  • Consider moving [section X] to references/[filename].md

Progressive Disclosure

Current Structure:

  • SKILL.md: [word count]
  • references/: [count] files, [total words]
  • examples/: [count] files
  • scripts/: [count] files

Assessment: [Is progressive disclosure effective?]

Recommendations: [Suggestions for better organization]

Specific Issues

Critical ([count])

  • [File/location]: [Issue] - [Fix]

Major ([count])

  • [File/location]: [Issue] - [Recommendation]

Minor ([count])

  • [File/location]: [Issue] - [Suggestion]

Positive Aspects

  • [What's done well 1]
  • [What's done well 2]

Overall Rating

[Pass/Needs Improvement/Needs Major Revision]

Priority Recommendations

  1. [Highest priority fix]
  2. [Second priority]
  3. [Third priority]

Edge Cases:

  • Skill with no description issues: Focus on content and organization
  • Very long skill (>5,000 words): Strongly recommend splitting into references
  • New skill (minimal content): Provide constructive building guidance
  • Perfect skill: Acknowledge quality and suggest minor enhancements only
  • Missing referenced files: Report errors clearly with paths

Before you install

  • Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
  • Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
  • Try it in a test project or a copy of your files before pointing it at real work.
  • Pin the version you tested, and review changes before updating.
  • Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Skill Reviewer?

Skill Reviewer is a subagent for Claude Code and Claude Cowork from the anthropics/claude-plugins-official repository on GitHub. Use this agent when the user has created or modified a skill and needs quality review, asks to "review my skill", "check skill quality", "improve skill description", or wants to ensure skill follows best practices. Trigger proactively after skill creation. Examples: Context: User just created a new skill user: "I've created a PDF processing skill" assistant: "Great! Let me review the skill…

How do I install Skill Reviewer in Claude Code?

Download skill-reviewer.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Skill Reviewer in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Skill Reviewer safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under Apache-2.0. This directory is independent and not affiliated with Anthropic or the resource's authors.