define flow self check input
  $allowed = execute self_check_input

  if not $allowed
    bot refuse to respond
    stop

define flow self check output
  $allowed = execute self_check_output

  if not $allowed
    bot refuse to respond
    stop

define bot refuse to respond
  "⚠️ I'm sorry, I can't respond to that. (This message was blocked by the guardrail)"