AgentBudget

AgentBudget makes the "$47 to $5,847 in 58 minutes" agent runaway visible and stoppable. You set token, dollar, and iteration limits, pick a real model with live per-million pricing, then launch one of three failure scenarios — an infinite retry loop, a deep-research spiral, or a tool-call explosion — and watch live meters climb green to red as the spend accelerates. When a limit trips, the kill switch fires with a full incident report: root cause, cost at kill, and the projected cost had nothing stopped it, plus a copy-ready prevention config. Single-file HTML and JavaScript, runs entirely in the browser with no backend.