Agent Hallucinates Non-Existent Service, Devs Urge Logging RAG Sources Per Turn
nejcar20 · reddit · 2026-08-01
A developer shared a production incident where an AI customer service agent falsely confirmed a service the shop didn't offer (printing diplomas).
During post-mortem debugging, they found that while tool calls were logged with message IDs, inline knowledge base lookups (RAG) were not persisted. This meant the exact context grounding the critical erroneous turn was completely untraceable.
The author's key takeaway: a sycophantic 'yes' and a fact-based 'yes' look identical in text. They can only be differentiated by checking if a retrieval actually landed in the context between turns. Making retrievals attributable to the specific triggering turn is crucial for turning subjective debugging into a simple log check.
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