Paper Detail
Yejin Yoon, Minseo Kim, Taeuk Kim
Users often omit essential details in their requests to LLM-based agents, resulting in under-specified inputs for tool use. This poses a fundamental challenge for tool-augmented agents, as API execution typically requires complete arguments, highlighting the need for personalized tool calling. To study this problem, we introduce MPT, a benchmark comprising 265 multi-session dialogues that cover three challenges: Preference Recall, Preference Induction, and Preference Transfer. We also propose PRefine, a test-time memory-augmented method that represents user preferences as evolving hypotheses. Through a generate--verify--refine loop, it extracts reusable constraints from history and improves tool-calling accuracy while using only 1.24% of the tokens required by full-history prompting. These results indicate that robust personalization in agentic systems depends on memory that captures the reasons behind user choices, not just the choices themselves.
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@misc{yoon2026latent,
title = {Latent Preference Modeling for Cross-Session Personalized Tool Calling},
author = {Yejin Yoon and Minseo Kim and Taeuk Kim},
year = {2026},
abstract = {Users often omit essential details in their requests to LLM-based agents, resulting in under-specified inputs for tool use. This poses a fundamental challenge for tool-augmented agents, as API execution typically requires complete arguments, highlighting the need for personalized tool calling. To study this problem, we introduce MPT, a benchmark comprising 265 multi-session dialogues that cover three challenges: Preference Recall, Preference Induction, and Preference Transfer. We also propose PR},
url = {https://huggingface.co/papers/2604.17886},
keywords = {tool-augmented agents, API execution, personalized tool calling, MPT benchmark, PRefine, test-time memory augmentation, generate--verify--refine loop, user preferences, multi-session dialogues, preference recall, preference induction, preference transfer, huggingface daily},
eprint = {2604.17886},
archiveprefix = {arXiv},
}
{}