InfoMosaic-Bench: Evaluating Multi-Source Information Seeking in Tool-Augmented Agents - Du, Yaxin; Zhang, Yuanshuo; Yang, Xiyuan; Zhou, Yifan; Wang, Cheng; Zou, Gongyi; Pang, Xianghe; Wang, WenHao; Chen, Menglan; Tang, Shuo; Chen, Siheng (International Conference on Learning Representations, 2026)