Agent Rules Books skill for Codex

CommunitySkillCreativity

AGENTS.md rules / skills for AI coding agents: Codex, Cursor & Claude Code. Inspired by Clean Code, Refactoring, DDD, Clean Architecture and DDIA programming books.

How to install Agent Rules Books in Codex

In Codex, ask the built-in skill installer for it:

$skill-installer install https://github.com/ciembor/agent-rules-books/tree/main/<skill>

Type this in Codex and replace <skill> with a folder name from 'What it contains'. $skill-installer is the skill installer built into Codex, and it downloads the skill from GitHub. Restart Codex if the skill doesn't show up. Check the repo README for any setup it needs. Source: Codex skills docs.

Or copy the skill folder (the one with SKILL.md) into ~/.agents/skills to use it in every project, or into .agents/skills in a repo to share it with that repo. Codex picks up new skills automatically. (where Codex loads skills)

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What it contains

Skills (14)

  • a-philosophy-of-software-design — Apply John Ousterhout-inspired software design rules when reducing complexity, designing module boundaries, or reviewing APIs and abstractions.
  • clean-architecture — Apply Robert C. Martin-inspired architecture rules when separating business policy from frameworks, databases, UI, or infrastructure details.
  • clean-code — Apply Robert C. Martin-inspired clean code rules when improving readability, naming, function design, responsibilities, or testable everyday code.
  • code-complete — Apply Steve McConnell-inspired construction rules when implementing routines, variables, classes, control flow, defensive code, or tests.
  • designing-data-intensive-applications — Apply Martin Kleppmann-inspired data-system rules when designing reliability, scalability, consistency, replication, transactions, streams, or schema evolution.
  • domain-driven-design-distilled — Apply Vaughn Vernon-inspired lightweight DDD rules when using bounded contexts, subdomains, context maps, and tactical modeling without excess ceremony.
  • domain-driven-design — Apply Eric Evans-inspired DDD rules when modeling a complex domain, defining bounded contexts, protecting ubiquitous language, or designing aggregates.
  • implementing-domain-driven-design — Apply Vaughn Vernon-inspired implementation DDD rules when building aggregates, domain events, repositories, application services, or context integrations.
  • patterns-of-enterprise-application-architecture — Apply Martin Fowler-inspired enterprise architecture rules when choosing layers, service layers, transaction scripts, domain models, repositories, mappers, or DTOs.
  • refactoring-guru — Apply Refactoring.Guru-inspired rules when diagnosing code smells, choosing refactoring techniques, and stopping cleanup before uncontrolled redesign.
  • refactoring — Apply Martin Fowler-inspired refactoring rules when improving existing code structure while preserving observable behavior.
  • release-it — Apply Michael T. Nygard-inspired production reliability rules when designing failure handling, timeouts, retries, circuit breakers, observability, or deployment behavior.
  • the-pragmatic-programmer — Apply Hunt and Thomas-inspired pragmatic programming rules when improving engineering judgment, feedback loops, DRY knowledge, orthogonality, automation, or adaptability.
  • working-effectively-with-legacy-code — Apply Michael Feathers-inspired legacy-code rules when changing hard-to-test code safely with characterization tests, seams, sprout methods, or wrap methods.

About this listing

Agent Rules Books is a community collection of agent skills on GitHub by ciembor: folders with a SKILL.md file, the format Codex loads skills from. Its README mentions Codex. It passed the CodexStacks quality filter for skills (at least 100 stars, pushed in the last 90 days, not a fork or a list, and at least one SKILL.md with a name and description). OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 25, 2026 (an install and load check, not a code review). From its files we found 14 skills. It's one of 137 listings in the Creativity category (category assigned by CodexStacks from the repo's topics and description).

Agent Rules Books FAQ

How do I install Agent Rules Books in Codex?

In Codex, type $skill-installer install https://github.com/ciembor/agent-rules-books/tree/main/<skill>. $skill-installer is the skill installer built into Codex (Codex skills docs). Or copy the skill folder (the one with SKILL.md) into ~/.agents/skills to use it in every project, or into .agents/skills in a repo to share it with that repo. Codex picks up new skills automatically.

Is Agent Rules Books an official Codex skill?

No. Agent Rules Books is a community repo on GitHub by ciembor. It passed the CodexStacks quality filter, but OpenAI hasn't reviewed it, but it passed our Codex install check on Oct 25, 2026 (an install and load check, not a code review), so read the code before you install it.

What does Agent Rules Books include?

From its manifest and repo files, Agent Rules Books includes 14 skills: a-philosophy-of-software-design, clean-architecture, clean-code, code-complete, designing-data-intensive-applications, domain-driven-design-distilled….

Details

Type
Skill
Category
Creativity (assigned by us)
Source
Community
Author
ciembor
License
MIT
GitHub stars
3,136 (at last sync)
Last push
2026-09-10
GitHub topics
agent-rules, agent-skills-manager, agents-md, agents-rules, agents-skills, agentsmd, ai-agent, ai-skills, claude-code, claude-code-skills, code-quality, cursor-rules
Source
https://github.com/ciembor/agent-rules-books
Website
https://ciembor.github.io/agent-rules-books/
Listed via
GitHub search: Codex skills (SKILL.md)
Install check by CodexStacks
Passed on Oct 25, 2026 with Codex CLI 0.163.0: Codex loaded its skills. proof · how we check

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Listed on CodexStacks

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<a href="https://codexstacks.com/p/agent-rules-books/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #3a2c26;border-radius:12px;background:#0d0b0a;color:#f3ece6;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#f3ece6">Agent Rules Books</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#b5a9a1">Community Codex skill · 14 skills</span><span style="display:block;margin:0 0 10px;color:#ddd3cc">AGENTS.md rules / skills for AI coding agents: Codex, Cursor &amp; Claude Code. Inspired by Clean Code, Refactoring, DDD…</span><span style="font-size:12px;font-weight:600;color:#ffb347">View on CodexStacks →</span></a>

Markdown summary

**[Agent Rules Books on CodexStacks](https://codexstacks.com/p/agent-rules-books/)**: Community Codex skill with 14 skills.

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