0 % vs 50 %: making a RAG agent refuse to hallucinate 2026-05-31 · LLM / RAG A...
A guarded prompt + validate step cut RAG out-of-corpus hallucination from ~50% to 0%, leaving retrieval recall at 94–100%. Enterprise RAG needs abstention as a rewarded output and an eval harness on out-of-corpus rate — without both, a 50% error is invisible.
0 % vs 50 %: making a RAG agent refuse to hallucinate
2026-05-31 · LLM / RAG
A retrieval-augmented agent is only as trustworthy as its behaviour on questions whose answer
isn't in the corpus. The failure mode is quiet: instead of saying "I don't know," the model
invents a confident, well-formed, wrong answer. This post shows a single guardrail that takes
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