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Beyond the Query: Do Retrieval Signals Improve Adaptive Multimodal RAG Routing?

arXiv · AI, language, vision and robotics · article · Sep 11, 2026 · UTC

Adaptive RAG often uses retrieval-time signals to decide whether another retrieval, reranking, or multimodal step should run. We ask whether these signals add routing value once the query itself is already known. Across document, audio, and video RAG, we compare matched query-only and query+retrieval routers while holding the optional actions, router family, training procedure, and evaluation fixed. On the held-out final evaluation, adding the tested retrieval signals does not produce a reliable routing improvement over the query-only baseline. Some retrieval signals are associated with whethe

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