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arXiv · 2610.19638

J-tau: A Fully Localized Japanese Benchmark for Tool-Agent-User Interaction

Chihiro Yano·Jun Hirako·Hiroaki Yamagiwa·Ryota Hirobuchi
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Abstract

We present J-tau, the first publicly available Japanese benchmark for evaluating tool-using LLM agents in interactive customer-support scenarios. While tau-bench is widely used to evaluate LLM agents, it is English-centric and cannot evaluate agents in other languages. Existing multilingual extensions offer no public Japanese version and rely primarily on machine translation, leaving locale-specific entities such as addresses and currencies inconsistent with the target region. To enable reliable evaluation in Japanese, we carefully localize tau-bench through machine translation, entity adaptation, and human review. During this process, we also uncover and fix two flaws in the original tau-bench: invalid tasks and a score aggregation error that inflates certain models' results. Experiments show that J-tau yields fewer evaluation errors than a naively machine-translated counterpart and that our fixes resolve both flaws.

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Chihiro Yano, Jun Hirako, Hiroaki Yamagiwa, Ryota Hirobuchi. 2026-10-14. J-tau: A Fully Localized Japanese Benchmark for Tool-Agent-User Interaction. https://arxiv.org/abs/2610.19638

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