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标题: "Actions Speak Louder than Words: Measuring Cross-Lingual Policy Retention in Tool-Using Agents"
原文链接: "https://arxiv.org/abs/2608.11110"
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## Computer Science > Computation and Language

## Title:Actions Speak Louder than Words: Measuring Cross-Lingual Policy Retention in Tool-Using Agents

Authors:[Sourabrata Mukherjee](https://arxiv.org/search/cs?searchtype=author&query=Mukherjee,+S), [Kalika Bali](https://arxiv.org/search/cs?searchtype=author&query=Bali,+K), [Sunayana Sitaram](https://arxiv.org/search/cs?searchtype=author&query=Sitaram,+S)

[View PDF](https://arxiv.org/pdf/2608.11110) [HTML (experimental)](https://arxiv.org/html/2608.11110v1)

> Abstract:When a tool-using agent is given the same task in a different language, does it still take the same steps? Multilingual evaluation rarely asks: it compares final answers and discards the actions. Yet those actions are the product: they fix cost and latency, decide how the system fails, and are the only auditable part of its behaviour. We make the action policy the measured object across 8 models, 6 parallel benchmarks and 41 languages (2.38M rollouts). The naive measurement fails: five confounds sit between raw trace similarity and any defensible claim, each able to flip a conclusion. Short traces score higher, empty traces score perfectly, unrelated traces agree by chance over half the time, the gap is capped by each model's reproducibility, and a model asked the same question twice in one language answers differently, leaving no baseline. We remove all five, and every correction makes the effect larger. Divergence proves structural, not sampling noise: it survives greedy decoding in every cell and stays flat as temperature rises, even as models grow less self-consistent. Normalised by their own reproducibility, four very different frontier models converge under greedy decoding, each keeping 71-73% of its action policy across languages, with model identity explaining only 5.7% of the variance. Below roughly 10B parameters it breaks down, and the ordering among smaller models is largely an artifact of a chance floor we measure by permutation rather than assume. Agents route non-English tasks through English; this pivot is causally load-bearing, confirmed by a pre-registered prediction across four models, and models will not abandon it when told to. Finally, a single trace-extraction regex, not the model, manufactured a multilingual failure: two worked examples raise one model's measured accuracy twenty-sixfold while its accuracy on readable outputs barely moves.

| Comments: |  |
| --- | --- |
| Subjects: | Computation and Language (cs.CL) |
| Cite as: | [arXiv:2608.11110](https://arxiv.org/abs/2608.11110) \[cs.CL\] |
|  | (or [arXiv:2608.11110v1](https://arxiv.org/abs/2608.11110v1) \[cs.CL\] for this version) |
|  | [https://doi.org/10.48550/arXiv.2608.11110](https://doi.org/10.48550/arXiv.2608.11110) |

## Submission history

From: Sourabrata Mukherjee \[[view email](https://arxiv.org/show-email/739bfd14/2608.11110)\]  
**\[v1\]** Tue, 11 Aug 2026 16:18:34 UTC (243 KB)

[Which authors of this paper are endorsers?](https://arxiv.org/auth/show-endorsers/2608.11110) | Disable MathJax ([What is MathJax?](https://info.arxiv.org/help/mathjax.html))
