Codex Rules Codex Rules is automatic once the plugin is enabled. It injects: - static project instructions on and - matching file-specific rules after Codex by default Dynamic output is injected as additional context and is deduplicated per plugin data session. Codex Rules does not rewrite tool output. Supported project sources: - - - - - - - - Supported environment knobs: - - - - - The legacy variables are accepted as fallbacks for users migrating from . ---