WALT: Web Agents that Learn Tools - Prabhu, Viraj; Dai, Yutong; Fernandez, Matthew; Ramakrishnan, Krithika; Gu, Jing; Luo, Yanqi; savarese, silvio; Xiong, Caiming; Li, Junnan; Chen, Zeyuan; Xu, Ran (International Conference on Learning Representations, 2026)