@article{llmagentsalreadyknowwhentocalltoolsevenw,
  title = {LLM Agents Already Know When to Call Tools -- Even Without Reasoning},
  author = {Chung-En Sun and Linbo Liu and Ge Yan and Zimo Wang and Tsui-Wei Weng},
  year = {2026},
  eprint = {2605.09252},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.09252},
}