Your agent returned HTTP 200, zero errors in the logs, and then did nothing. The failure wasn't loud — it was silent.
This happens more than you'd think. An agent invokes a model, gets back a response, processes it, returns success. But somewhere in that flow the actual output — the thing that was supposed to happen — vanished. No exception. No timeout. Just an empty response where a decision or action should have been.
Standard monitoring catches loud failures: connection timeouts, rate limits, exceptions. It misses the silent ones. Here's why, and how to spot them.
The three signals most monitors ignore
When an LLM agent runs, three things happen:
