# Book Clean Code Nano

> Clean Code (Robert C. Martin) — Minimal rules — essential one-liners only. Use when asked to apply Clean Code principles or review code against Clean Code standards.

- Skill: `yanacuti1121/book-clean-code-nano` (Agent Skill)
- Install (CLI): `npx skillmds add yanacuti1121/book-clean-code-nano`
- Raw SKILL.md: https://api.skillmd.com/api/skills/yanacuti1121/book-clean-code-nano/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: yanacuti1121 (https://skillmd.com/u/yanacuti1121)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/yanacuti1121/book-clean-code-nano

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# OBEY Clean Code by Robert C. Martin

## When to use

Use when you need a small always-on bias toward readable, low-surprise code.

## Primary bias to correct

Working code is not automatically clean code.

## Decision rules

- Preserve behavior, write for the next reader, and leave touched code cleaner within scope.
- Write for local reasoning and use precise names with one term per concept.
- Split boolean flags, mixed abstraction levels, and hidden side effects out of functions.
- Separate commands from queries and keep parameters small and meaningful.
- Keep the happy path readable; make invalid states, errors, and cleanup explicit instead of implicit.
- Use comments only for rationale or contracts, not to explain confusing code.
- When touching code, remove the smell most likely to make the next change risky or unclear.

## Trigger rules

- When a function both mutates and answers, split it.
- When a comment explains the flow, simplify the code first.
- When async, concurrency, or framework quirks spread the change, reduce shared mutable state and add the right boundary instead of more branching.

## Final checklist

- Local reasoning preserved?
- Clear names?
- Clear mutation boundaries?
- One smell removed?