A machine-readable steering error code. Clients should handle unknown values because additional codes may be introduced. Known values include:
response_not_found: The target response is not available on this connection.invalid_input: The event or input failed validation.steering_not_supported: The model or response execution mode does not support steering.too_many_pending_steers: Too much steering input is pending for the response.response_already_completed: The response completed and is no longer accepting steering input.response_not_active: The response is no longer accepting steering input.successor_creation_failed: The successor response could not be created.