Claude MD Improver Skill for Claude

CLAUDE.md Improver

Audit, evaluate, and improve CLAUDE.md files across a codebase to ensure Claude Code has optimal project context.

This skill can write to CLAUDE.md files. After presenting a quality report and getting user approval, it updates CLAUDE.md files with targeted improvements.

Workflow

Phase 1: Discovery

Find all CLAUDE.md files in the repository:

find . -name "CLAUDE.md" -o -name ".claude.md" -o -name ".claude.local.md" 2>/dev/null | head -50

File Types & Locations:

| Type | Location | Purpose |

|------|----------|---------|

| Project root | ./CLAUDE.md | Primary project context (checked into git, shared with team) |

| Local overrides | ./.claude.local.md | Personal/local settings (gitignored, not shared) |

| Global defaults | ~/.claude/CLAUDE.md | User-wide defaults across all projects |

| Package-specific | ./packages/*/CLAUDE.md | Module-level context in monorepos |

| Subdirectory | Any nested location | Feature/domain-specific context |

Note: Claude auto-discovers CLAUDE.md files in parent directories, making monorepo setups work automatically.

Phase 2: Quality Assessment

For each CLAUDE.md file, evaluate against quality criteria. See references/quality-criteria.md for detailed rubrics.

Quick Assessment Checklist:

| Criterion | Weight | Check |

|-----------|--------|-------|

| Commands/workflows documented | High | Are build/test/deploy commands present? |

| Architecture clarity | High | Can Claude understand the codebase structure? |

| Non-obvious patterns | Medium | Are gotchas and quirks documented? |

| Conciseness | Medium | No verbose explanations or obvious info? |

| Currency | High | Does it reflect current codebase state? |

| Actionability | High | Are instructions executable, not vague? |

Quality Scores:

• A (90-100): Comprehensive, current, actionable
• B (70-89): Good coverage, minor gaps
• C (50-69): Basic info, missing key sections
• D (30-49): Sparse or outdated
• F (0-29): Missing or severely outdated

Phase 3: Quality Report Output

ALWAYS output the quality report BEFORE making any updates.

Format:

## CLAUDE.md Quality Report

### Summary
- Files found: X
- Average score: X/100
- Files needing update: X

### File-by-File Assessment

#### 1. ./CLAUDE.md (Project Root)
**Score: XX/100 (Grade: X)**

| Criterion | Score | Notes |
|-----------|-------|-------|
| Commands/workflows | X/20 | ... |
| Architecture clarity | X/20 | ... |
| Non-obvious patterns | X/15 | ... |
| Conciseness | X/15 | ... |
| Currency | X/15 | ... |
| Actionability | X/15 | ... |

**Issues:**
- [List specific problems]

**Recommended additions:**
- [List what should be added]

#### 2. ./packages/api/CLAUDE.md (Package-specific)
...

Phase 4: Targeted Updates

After outputting the quality report, ask user for confirmation before updating.

Update Guidelines (Critical):

• Propose targeted additions only - Focus on genuinely useful info:
• Commands or workflows discovered during analysis
• Gotchas or non-obvious patterns found in code
• Package relationships that weren't clear
• Testing approaches that work
• Configuration quirks

• Keep it minimal - Avoid:
• Restating what's obvious from the code
• Generic best practices already covered
• One-off fixes unlikely to recur
• Verbose explanations when a one-liner suffices

• Show diffs - For each change, show:
• Which CLAUDE.md file to update
• The specific addition (as a diff or quoted block)
• Brief explanation of why this helps future sessions

Diff Format:

### Update: ./CLAUDE.md

**Why:** Build command was missing, causing confusion about how to run the project.

+ ## Quick Start

+

+ `bash

+ npm install

+ npm run dev # Start development server on port 3000

+ `

Phase 5: Apply Updates

After user approval, apply changes using the Edit tool. Preserve existing content structure.

Templates

See references/templates.md for CLAUDE.md templates by project type.

Common Issues to Flag

• Stale commands: Build commands that no longer work
• Missing dependencies: Required tools not mentioned
• Outdated architecture: File structure that's changed
• Missing environment setup: Required env vars or config
• Broken test commands: Test scripts that have changed
• Undocumented gotchas: Non-obvious patterns not captured

User Tips to Share

When presenting recommendations, remind users:

• # key shortcut: During a Claude session, press # to have Claude auto-incorporate learnings into CLAUDE.md
• Keep it concise: CLAUDE.md should be human-readable; dense is better than verbose
• Actionable commands: All documented commands should be copy-paste ready
• Use .claude.local.md: For personal preferences not shared with team (add to .gitignore)
• Global defaults: Put user-wide preferences in ~/.claude/CLAUDE.md

What Makes a Great CLAUDE.md

Key principles:

• Concise and human-readable
• Actionable commands that can be copy-pasted
• Project-specific patterns, not generic advice
• Non-obvious gotchas and warnings

Recommended sections (use only what's relevant):

• Commands (build, test, dev, lint)
• Architecture (directory structure)
• Key Files (entry points, config)
• Code Style (project conventions)
• Environment (required vars, setup)
• Testing (commands, patterns)
• Gotchas (quirks, common mistakes)
• Workflow (when to do what)

Related Skills

• dependency-upgrade: Include dependency hardening policies and lockfile/security workflow guidance when improving repository CLAUDE.md files