How I Built Open-Source Guardrails That Auto-Stop Runaway AI Agents
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Runaway AI agents are expensive. Stories of agents burning through thousands of dollars overnight come up regularly on Reddit and Hacker News — no budget limit, no loop detection, no kill switch. The agent keeps calling GPT-4 in an infinite loop until someone wakes up and pulls the plug. I built reivo-guard to prevent this. It's an open-source guardrail library that detects and stops runaway AI agents — with sub-microsecond overhead. This post walks through the architecture decisions behind ea