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Developer builds runtime kill switch to stop AI agents looping and burning API budget

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After a bank alert revealed two AI agents stuck in a six-hour loop, the developer began building a fix for a failure mode many agent builders reportedly face. Standard step-count limits were judged inadequate, since they measure effort rather than progress and can either waste money or cut off useful work. The tool, called AgentTrafficCop, sits on the spend path so every tool call passes through it, detecting loops by comparing state rather than counting steps. When a repeated call occurs without any underlying state change, it blocks the call and terminates the run. It also validates tool-call payloads against schemas to reject hallucinated parameters before they reach production systems.

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