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.