name	reviewing-claude-config
description	Reviews Claude configuration files for security, structure, and prompt engineering quality. Use when reviewing changes to CLAUDE.md files (project-level or .claude/), skills (SKILL.md), agents, prompts, commands, or settings. Validates YAML frontmatter, progressive disclosure patterns, token efficiency, and security best practices. Detects critical issues like committed settings.local.json, hardcoded secrets, malformed YAML, broken file references, oversized skill files, and insecure agent tool access.
version	1.0.0
allowed-tools	Read, Grep, Glob

Reviewing Claude Configuration

Instructions

IMPORTANT: Use structured thinking throughout your review process. Plan your analysis before providing feedback. This improves accuracy and catches critical security issues.

Step 1: Detect File Type

Analyze the changed files: 1. Which .claude files were modified? 2. What file types? (CLAUDE.md, skills, agents, prompts, commands, settings) 3. Are there immediate security concerns? 4. What's the review scope (single file or multiple)?

Determine the primary file type(s) being reviewed:

Detection Rules:

Agents: Changes to .claude/agents/*.md or plugins/*/agents/*.md
Skills: Changes to skill.md files or skill support files (checklists, references, examples)
CLAUDE.md: Changes to CLAUDE.md files (any location: project root, .claude/, or subdirectories)
Prompts/Commands: Changes to .claude/prompts/*.md or .claude/commands/*.md
Settings: Changes to .claude/settings.json or .claude/settings.local.json

If multiple types modified, review each with appropriate checklist.

Step 2: Execute Security Scan (ALWAYS)

Security first, regardless of file type: 1. Is settings.local.json committed to git? 2. Any hardcoded secrets (passwords, tokens, API keys)? 3. Are permissions appropriately scoped (if settings modified)? 4. Any suspicious patterns in changed files?

CRITICAL CHECKS (perform for ALL Claude config reviews):

Run these mental checks immediately:

settings.local.json NOT in git (check changed files list)
No hardcoded credentials in any modified files
Permissions scoped appropriately (if settings.json modified)
No API keys, tokens, or passwords in plaintext

If ANY security issue found: Flag as CRITICAL immediately, stop and report.

Consult reference/security-patterns.md for detailed security checks and detection commands.

Step 3: Load Appropriate Checklist

Based on detected file type, read and follow the relevant checklist:

Agents → checklists/agents.md (YAML, tool access security, model selection, system prompts)
Skills → checklists/skills.md (structure, YAML, progressive disclosure, quality)
CLAUDE.md → checklists/claude-md.md (clarity, references, no duplication)
Prompts/Commands → checklists/prompts.md (purpose, session context, skill references)
Settings → checklists/settings.md (security, permissions scoping)

The checklist provides:

Multi-pass review strategy
What to check and what to skip
Structured thinking guidance
Common issues and red flags

Step 4: Consult Reference Materials As Needed

When to load references: 1. Need to classify issue priority? → priority-framework.md 2. Security patterns unclear? → security-patterns.md 3. Claude Code requirements (YAML, tools, models, limits)? → claude-code-requirements.md

Load reference files only when needed for specific questions:

Issue prioritization → reference/priority-framework.md (CRITICAL vs IMPORTANT vs SUGGESTED vs OPTIONAL)
Security patterns → reference/security-patterns.md (detection commands, fix examples)
Claude Code requirements → reference/claude-code-requirements.md (YAML frontmatter, model selection, tool names, progressive disclosure, settings conventions)

Step 5: Document Findings

Before writing each comment: 1. Priority level? (Critical/Important/Suggested/Optional) 2. Security issue or quality issue? 3. What's the specific fix or recommendation? 4. What's the rationale (why does this matter)? 5. Is there a reference or documentation link?

This section defines the standard output format for ALL Claude config reviews. Checklists reference this section rather than duplicating content.

CRITICAL: Use inline comments on specific lines, NOT one large summary comment.

Inline Comment Rules:

Create separate comment for EACH specific issue on the exact line
Do NOT create one large summary comment with all issues
Do NOT update existing comments - always create new comments
Include specific fix with code example when applicable
Explain rationale (why this matters)

Comment Format:

**[file:line]** - [PRIORITY]: [Issue description]

[Specific fix with code example if applicable]

[Rationale explaining why this matters]

Reference: [documentation link if applicable]

Example inline comment:

**.claude/skills/my-skill/skill.md:1** - CRITICAL: Missing YAML frontmatter

Skills require YAML frontmatter to be discoverable by Claude Code:

\```yaml
---
name: my-skill
description: Clear description with activation triggers
---
\```

Without frontmatter, the skill won't be recognized by Claude Code.

Reference: Anthropic Skills Documentation

When to use inline vs summary:

Inline comment: Specific issue, recommendation, or question (use file:line format)
Summary comment: Overall assessment, recommendation (APPROVE or REQUEST CHANGES)

Load the specific example relevant to your file type (on-demand only, not upfront):

Agents → examples/example-agent-review.md
Skills → examples/example-skill-review.md
CLAUDE.md → examples/example-claude-md-review.md
Settings → examples/example-settings-review.md
Prompts → examples/example-prompts-review.md

Core Principles

Security first: Always check for committed settings, secrets, overly broad permissions
Structure matters: YAML frontmatter, file references, progressive disclosure, line limits
Quality counts: Clear instructions, examples, proper emphasis, structured thinking
Token efficiency: Progressive disclosure, appropriate file sizes, on-demand loading
Actionable feedback: Say what to do and why, not just what's wrong
Constructive tone: Focus on code/config, not people; explain rationale

Install Skill

SKILL.md