Preventing Recursive Tool Loops in LangChain Agents

One of the fastest ways for LangChain agents to become unstable in production is not model quality. A workflow starts normally: search retrieve summarize Then suddenly: the same tool gets called repeatedly retries compound context grows token usage spikes execution drifts indefinitely The agent technically remains “alive.” Operationally, it stopped making progress a long time ago. This article shows a simple way to detect and interrupt recursive tool loops in LangChain agents using TypeScript.