| 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:
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.