Study Reveals Lack of Causal Effectiveness in Multimodal LLM Visual Tool-Use

Zhiheng Wang · hf · 2026-08-13

This paper conducts a causal audit of visual tool-use in multimodal LLMs. The research reveals that visual tool-use often lacks causal effectiveness: returned observations frequently fail to influence the final answers or are used incoherently, despite improvements in aggregate accuracy.

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