{"slug": "j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-user-interaction", "title": "J-tau: A Fully Localized Japanese Benchmark for Tool-Agent-User Interaction", "summary": "Researchers released J-tau, described as the first publicly available Japanese benchmark for evaluating tool-using LLM agents in interactive customer-support scenarios, localizing tau-bench via machine translation, entity adaptation, and human review. The team also uncovered and fixed two flaws in the original tau-bench: invalid tasks and a score aggregation error that inflates certain models' results. Experiments show J-tau yields fewer evaluation errors than a naively machine-translated counterpart.", "body_md": "arXiv:2610.19638v1 Announce Type: new \nAbstract: 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.", "url": "https://wpnews.pro/news/j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-user-interaction", "canonical_source": "https://www.machinebrief.com/news/j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-us-hf4q", "published_at": "2026-10-15 04:00:00+00:00", "updated_at": "2026-10-15 05:52:50.776833+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-agents", "ai-research", "natural-language-processing"], "entities": ["J-tau", "tau-bench", "arXiv"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-user-interaction", "markdown": "https://wpnews.pro/news/j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-user-interaction.md", "text": "https://wpnews.pro/news/j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-user-interaction.txt", "jsonld": "https://wpnews.pro/news/j-tau-a-fully-localized-japanese-benchmark-for-tool-agent-user-interaction.jsonld"}}