Co-authored with Jacopo (Agent-Devtools)
At 3:07 AM, my agent made 21 API calls to a premium LLM endpoint. Each cost $133. Total time: 60 seconds. Total bill: $2,800.
I was asleep. The budget alert email, the thing I'd set up so this couldn't happen, arrived 4 minutes later. Also while I was asleep. It was a very informative email about money that was already gone.
That night taught me something that took two open-source projects to fully solve:
You need a firewall to stop the bleed. You need a debugger to see why it happened. One without the other is half a safety system.
