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name: readability-review description: > Code readability review based on "The Art of Readable Code" and Miller's Law (7±2 cognitive limits). Use when reviewing readability (可読性), understandability (理解しやすい/わかりやすい), clarity (明確), naming (命名), variable/function names (変数名/関数名), nesting depth (ネスト/深いネスト), function design (関数設計), comments (コメント), complexity (複雑), confusing code (難しい/難読), Miller's Law (ミラーの法則), cognitive load (認知負荷), AI-generated code issues, premature optimization, over-engineering (過剰設計), or unnecessary abstractions (不要な抽象化). Detects readability issues and suggests improvements based on cognitive science. Essential for readability-focused code reviews. allowed-tools: Read, Grep, Glob, Task

Readability Review - Code Clarity & Cognitive Load Analysis

🎯 Core Philosophy

"Code should be written to minimize the time it would take for someone else to understand it"

• That "someone else" might be you six months later
• Understanding time > writing time
• Target: New team member can understand code in < 1 minute

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🧠 Scientific Foundation: Miller's Law

Human cognitive capacity is limited to 7±2 items

When code exceeds these limits:

• Comprehension time increases exponentially
• Error rates multiply
• Mental fatigue accelerates

Our brains literally cannot process too much complexity at once.

Recommended Limits:

Context	Ideal	Maximum
Function arguments	3	5
Class methods	5	7
Conditional branches	3	5
Function length	5-10 lines	15 lines
Nesting depth	2	3

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📚 Section-Based Content

This skill is organized into 4 specialized sections for efficient context usage:

📝 Section 1: Naming & Structure Fundamentals

File: references/naming-structure.md Tokens: ~500 Focus: Variable/function naming, concrete vs abstract, searchability

Triggers: naming, 命名, variable name, 変数名, function name, 関数名, concrete, abstract

Coverage:

• Names that can't be misconstrued
• Concrete over abstract naming
• Searchable, pronounceable names
• Specific vs generic naming

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🔀 Section 2: Control Flow & Complexity

File: references/control-flow.md Tokens: ~600 Focus: Control flow optimization, nesting reduction, Miller's Law application

Triggers: nesting, ネスト, control flow, Miller's Law, complexity, guard clause, early return

Coverage:

• Minimize nesting depth
• Guard clauses and early returns
• Extract complex conditions
• Miller's Law application (7±2 limits)
• Function length and complexity guidelines

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💬 Section 3: Comments & Clarity

File: references/comments-clarity.md Tokens: ~400 Focus: Comment strategy, intent communication, code self-documentation

Triggers: comments, コメント, documentation, intent, 意図, obvious, clarity

Coverage:

• Why, not What comments
• Code first, comments second
• Update or delete outdated comments
• Make code look like intent

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🤖 Section 4: AI Code Antipatterns

File: references/ai-antipatterns.md Tokens: ~500 Focus: Detecting over-engineering patterns in AI-generated code

Triggers: AI, AI-generated, premature, over-engineering, unnecessary abstraction

Coverage:

• Premature abstraction detection
• Unnecessary classes for simple tasks
• Imagined extensibility
• Detection & remediation strategies

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💡 Practical Application

Auto-Trigger Example

User: "This function is hard to understand"

Readability Review Skill triggers →

"From a readability perspective, let's improve:

1. Function name clarity
2. Nesting reduction (currently 4 levels)
3. Extract complex conditions
4. Apply Miller's Law (max 5 parameters)

Let me suggest specific improvements..."

Common Scenarios

1. Function review

   • Check parameter count (≤5)
   • Verify function length (5-15 lines)
   • Assess nesting depth (≤3 levels)

2. Variable naming

   • Ensure concrete over abstract
   • Check searchability
   • Verify pronounceability

3. Code structure

   • Apply guard clauses
   • Extract subproblems
   • One task per function

4. AI code review

   • Detect premature abstractions
   • Flag unnecessary classes
   • Identify over-engineering

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✨ Key Takeaways

1. Clarity beats cleverness - Simple code wins
2. Respect cognitive limits - Miller's Law (7±2)
3. Names matter - Concrete, searchable, pronounceable
4. Control flow - Minimize nesting, use guard clauses
5. Comments wisely - Explain why, not what

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The Final Test: "Would a new team member understand this in < 1 minute?"