# Kiss Dry Yagni > Principes KISS, DRY, YAGNI. Use when reviewing code quality or refactoring. Use when this capability is needed. - Skill: `tomevault-io/kiss-dry-yagni` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/kiss-dry-yagni` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/kiss-dry-yagni/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/kiss-dry-yagni --- # Principes KISS, DRY, YAGNI This skill provides simplicity and code quality guidelines. See @REFERENCE.md for detailed documentation. ## Quick Reference - **KISS**: Methods < 20 lines, complexity < 10, indent < 3 levels - **DRY**: Abstract after 3 occurrences, single source of truth - **YAGNI**: Only build what's explicitly required NOW - **Early returns**: Prefer guard clauses over nested else - **Composition**: Prefer over inheritance --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/thebeardedbearsas) — claim your Tome and manage your conversions.