VTC-Bench: Evaluating Agentic Multimodal Models via Compositional Visual Tool Chaining. - Xuanyu Zhu 001; Yuhao Dong; Rundong Wang; Yang Shi 009; Zhipeng Wu; Yinlun Peng; YiFan Zhang; Yihang Lou; Yuanxing Zhang; Ziwei Liu 002; Yan Bai; Yuan Zhou (CoRR, 2026)