Use when the user asks about Codex Rules behavior, injected project rules, supported rule file locations, matching, or environment configuration.
Scanned 9/2/2026
Install to Claude Code
Skills Directorynpx -y skills add code-yeongyu/oh-my-openagent --skill rules --agent claude-codeInstalls into .claude/skills of the current project.
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---
name: rules
description: Use when the user asks about Codex Rules behavior, injected project rules, supported rule file locations, matching, or environment configuration.
---
# 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`
The legacy `PI_RULES_*` variables are accepted as fallbacks for users migrating from `pi-rules`.
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