Answer Presence Drives RAG Rewriting Gains

In three linesControlled intervention study shows RAG rewriting gains are driven by gold answer presence in rewritten context, not curation quality. Tests across Qwen2.5/3.5, GLM-4 and HotpotQA/2WikiMultihopQA: removing answer drops F1 by 28–64 points, injecting it raises F1 by +0.7 to +9.7 points. Authors release intervention runner and sentinel panel for reproducible evaluation.

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