The bus module's tool hands the ask to the keeper through its own state requests (design 25 § 12.2), as the caller the tool runner proved; the keeper asks indexer_bus_state at once beside its backoff, applies what it answers, records the hand act and writes back what it answered and at which revision. Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig