Codex Rules

by code-yeongyu

Codex Rules is an AI Engineering skill for Claude Code, published by code-yeongyu in lazycodex.

3.2K stars201 forkson code-yeongyu/lazycodexAdded 2026/08/17+1% in starsRepository updated 2026/08/09

View source on GitHub Download repo ZIP

aiai-agentsclaudeclaude-codeclicodexdeveloper-toolslazylazycodexoh-my-openagentomoopenaiorchestrationtypescript

Install in seconds

Install Codex Rules

Copy Codex Rules into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/code-yeongyu/lazycodex/tree/main/plugins/omo/skills/rules ~/.claude/skills/rules

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/code-yeongyu/lazycodex.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: plugins/omo/skills/rules/SKILL.md in code-yeongyu/lazycodex
Installs to: ~/.claude/skills/rules
Collection: One of 25 skills cataloged from this repository
Category: AI Engineering — 2451 skills

What Codex Rules does

Codex Rules injects static project instructions and file-specific rules into Codex sessions automatically. Use it to configure supported rule file locations, matching behavior, and environment variables for Codex.

Codex Rules is cataloged under AI Engineering on DirSkills. Codex Rules comes from a repository tagged ai, ai-agents, claude, claude-code and cli.

Documentation

README

Excerpt

Codex Rules

Codex Rules is automatic once the plugin is enabled. It injects:

static project instructions on SessionStart and UserPromptSubmit
matching file-specific rules after Codex apply_patch by default

Dynamic PostToolUse output is injected as additional context and is deduplicated per plugin data session. Codex Rules does not rewrite tool output.

Supported project sources:

CONTEXT.md
.omo/rules/**/*.md
.claude/rules/**/*.md
.cursor/rules/**/*.md
.github/instructions/**/*.md
.github/copilot-instructions.md

Supported environment knobs:

CODEX_RULES_DISABLED=1
CODEX_RULES_MODE=both|static|dynamic|off
CODEX_RULES_MAX_RULE_CHARS=<number>
CODEX_RULES_MAX_RESULT_CHARS=<number>
CODEX_RULES_ENABLED_SOURCES=CONTEXT.md,.omo/rules

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Codex Rules

What else does code-yeongyu publish alongside Codex Rules?
Codex Rules is one of 25 skills that DirSkills catalogs from code-yeongyu/lazycodex, the repository it ships in. Its siblings there include Ast-Grep, Bug Fix Contribution and Coding Agent Sessions. Each one is a separate skill with its own page in this directory, installs the same way Codex Rules does, and is maintained by code-yeongyu in that same repository. The rest of the collection is listed on the code-yeongyu/lazycodex page.
How does Codex Rules compare to other AI Engineering skills?
Codex Rules ranks #635 by stars among the 2451 AI Engineering skills in this catalog. The most-starred ones next to it are Architecture Decision Records, AI-First Engineering and Agentic OS. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Codex Rules against them. Open each page to compare what they document and how they install.