Tap the phone. Read the values it produced.

A checkout app talking to a Python backend that has a pricing bug. Change the coupon or the shipping toggle and the frames on the right are what the trap captured from that exact request — the backend never paused to hand them over.

Every state here was recorded by running examples/checkout_app/backend.py under aidebugger and driving it from the phone. The frames are real captures, not illustrations.