@article{chartooltoolintegratedvisualreasoningfor,
  title = {CharTool: Tool-Integrated Visual Reasoning for Chart Understanding},
  author = {Situo Zhang and Yifan Zhang and Zichen Zhu and Da Ma and Lei Pan and Danyang Zhang and Zihan Zhao and Lu Chen and Kai Yu},
  year = {2026},
  eprint = {2604.02794},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2604.02794},
}