The letter argues agent authorization needs context-sensitive thresholds and human approval, illustrating $100K, $1M and $10M payments.A design argument, not a released permission system.TIBBIR UNIVERSE THIS IS TIBBIR How to get TIBBIR Ribbit in numbers Connected clues Account archive Bridge & contracts On-chain research Connections Community The story Reading room Network map Timeline Findings Source library Conversations People & companies Open questions Export & reuse