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News/TAPO: Tool-Aware Policy Optimization via Credit Transfer for Multimodal Search Agents
arxiv
PublishedJune 6, 2026 at 4:00 AM
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TAPO: Tool-Aware Policy Optimization via Credit Transfer for Multimodal Search Agents

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arXiv:2606.05784v1 Announce Type: new Abstract: We identify and formally characterize credit misassignment as a systematic failure mode of GRPO in tool-augmented multimodal search agents: its uniform broadcast of trajectory-level advantages to all tokens causes valuable tool-use steps in failing tra

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