Clean Code - Pragmatic AI Coding Standards

> CRITICAL SKILL - Be concise, direct, and solution-focused.

Core Principles

| Principle | Rule | |-----------|------| | SRP | Single Responsibility - each function/class does ONE thing | | DRY | Don't Repeat Yourself - extract duplicates, reuse | | KISS | Keep It Simple - simplest solution that works | | YAGNI | You Aren't Gonna Need It - don't build unused features | | Boy Scout | Leave code cleaner than you found it |

Naming Rules

| Element | Convention | |---------|------------| | Variables | Reveal intent: userCount not n | | Functions | Verb + noun: getUserById() not user() | | Booleans | Question form: isActive, hasPermission, canEdit | | Constants | SCREAMING_SNAKE: MAX_RETRY_COUNT |

> Rule: If you need a comment to explain a name, rename it.

Function Rules

| Rule | Description | |------|-------------| | Small | Max 20 lines, ideally 5-10 | | One Thing | Does one thing, does it well | | One Level | One level of abstraction per function | | Few Args | Max 3 arguments, prefer 0-2 | | No Side Effects | Don't mutate inputs unexpectedly |

Code Structure

| Pattern | Apply | |---------|-------| | Guard Clauses | Early returns for edge cases | | Flat > Nested | Avoid deep nesting (max 2 levels) | | Composition | Small functions composed together | | Colocation | Keep related code close |

AI Coding Style

| Situation | Action | |-----------|--------| | User asks for feature | Write it directly | | User reports bug | Fix it, don't explain | | No clear requirement | Ask, don't assume |

Anti-Patterns (DON'T)

| ❌ Pattern | ✅ Fix | |-----------|-------| | Comment every line | Delete obvious comments | | Helper for one-liner | Inline the code | | Factory for 2 objects | Direct instantiation | | utils.ts with 1 function | Put code where used | | "First we import..." | Just write code | | Deep nesting | Guard clauses | | Magic numbers | Named constants | | God functions | Split by responsibility |

🔴 Before Editing ANY File (THINK FIRST!)

Before changing a file, ask yourself:

| Question | Why | |----------|-----| | What imports this file? | They might break | | What does this file import? | Interface changes | | What tests cover this? | Tests might fail | | Is this a shared component? | Multiple places affected |

Quick Check:

File to edit: UserService.ts
└── Who imports this? → UserController.ts, AuthController.ts
└── Do they need changes too? → Check function signatures

> 🔴 Rule: Edit the file + all dependent files in the SAME task. > 🔴 Never leave broken imports or missing updates.

Summary

| Do | Don't | |----|-------| | Write code directly | Write tutorials | | Let code self-document | Add obvious comments | | Fix bugs immediately | Explain the fix first | | Inline small things | Create unnecessary files | | Name things clearly | Use abbreviations | | Keep functions small | Write 100+ line functions |

> Remember: The user wants working code, not a programming lesson.

🔴 Self-Check Before Completing (MANDATORY)

Before saying "task complete", verify:

| Check | Question | |-------|----------| | ✅ Goal met? | Did I do exactly what user asked? | | ✅ Files edited? | Did I modify all necessary files? | | ✅ Code works? | Did I test/verify the change? | | ✅ No errors? | Lint and TypeScript pass? | | ✅ Nothing forgotten? | Any edge cases missed? |

> 🔴 Rule: If ANY check fails, fix it before completing.

Verification Scripts (MANDATORY)

> 🔴 CRITICAL: Each agent runs ONLY their own skill's scripts after completing work.

🧠 Knowledge Modules (Fractal Skills)

1. Agent → Script Mapping

2. 🔴 Script Output Handling (READ → SUMMARIZE → ASK)

3. ❌ Errors Found (X items)

4. ⚠️ Warnings (Y items)

5. ✅ Passed (Z items)