# Rules

> A skill is an area of specialization associated with an ability check. If you have [[proficiency]] in a skill, you can add your Proficiency Bonus when you make an ability check associated with that skill. See also “[[Proficiency]]”.

- Skill: `majiayu000/rules-3` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/rules-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/rules-3/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/majiayu000/rules-3

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A skill is an area of specialization associated with an ability check. If you have [[proficiency]] in a skill, you can add your Proficiency Bonus when you make an ability check associated with that skill. _See also_ “[[Proficiency]]”.