The Agent Who Couldn't Tip

An agent was given a dinner to arrange. Its principal, a careful person, had read all the right warnings and issued a mandate of admirable precision: Osteria Fiorella, tonight, party of four, $240 — the menu total, verified twice.

The dinner was excellent. The bill arrived at $240, as computed. Then the card machine did what card machines do at the end of a good meal: it paused on a screen that said Add gratuity?

The agent consulted its mandate. Two hundred and forty, zero cents. Not a cent of headroom — headroom had been explicitly identified in the principal’s favorite security blog as attack surface. The agent could not tip. It could not not-tip either, gracefully; the waiter stood there while the agent placed a hold that could not stretch, and the principal, unreachable at a concert, missed four authorization-retry notifications.

The bill was eventually settled by a human at the next table who found the whole scene unbearable.

The old rails knew this problem. A fuel pump authorizes before anyone knows the tank’s appetite; a hotel authorizes before the minibar confesses. Card systems grew tolerances — completion amounts may drift from authorizations within rulebook bounds — because the physical world invoices approximately. The mandate’s authors had rediscovered precision, and precision, alone at dinner, is a social catastrophe.