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rules

Use when the user asks about Codex Rules behavior, injected project rules, supported rule file locations, matching, or environment configuration.

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code-yeongyu/codex-rules

See how to install

Files included (1)

SKILL.md1.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

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:

AGENTS.md
CLAUDE.md
CONTEXT.md
.sisyphus/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=AGENTS.md,.sisyphus/rules

The legacy PI_RULES_* variables are accepted as fallbacks for users migrating from pi-rules.

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Install

Install with a command

npx skills add https://github.com/code-yeongyu/codex-rules --skill rules

Paste it into your terminal and run it (requires Node.js). You can choose which agents to install it for, such as Claude Code or Codex.

Ask your agent

Please install the following Agent Skill.
https://github.com/code-yeongyu/codex-rules/tree/main/skills/rules

First review SKILL.md and the bundled files and confirm there is nothing suspicious (such as sending data externally or reading credentials). Then place it in ~/.claude/skills/rules/ for Claude Code, or ~/.agents/skills/rules/ for Codex.

Send this text to Claude Code or Codex as is. It checks the contents before installing.

View source on GitHub

Repository: code-yeongyu/codex-rules
Stars: 15
Forks: 2
Category: Development
License: MIT
Original language: English
Last updated: Aug 28, 2026

A skill is a set of instructions and scripts for an agent. cccskills does not guarantee that skills are safe. Review the contents before you install.