Detecting silent Agent failures: Why nothing errored but it still failed
JellyfishSweaty8856 · reddit · 2026-08-15
The author shares insights on a difficult class of Agent failures: silent failures where no step errors out, but the result is wrong (e.g., a compliance gate returns noconsent but the model infers success). These issues look clean observation-by-observation and require end-to-end trace analysis. To address this, the author built deterministic detectors that read whole turns sequentially without LLM judges. The project, 'postflight', is open-sourced with Langfuse and OTel adapters.
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