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Detecting Silent Tool Failures from Output Distributions

In Proceedings of the 1st Workshop on Reliable Tool-Using Agents (RTUA 2026), pp. 19–24. Lisbon, Portugal, 12 Jun 2026.

DOI 10.xxxx/ctm.pr.2026.0003 · ID CTM-PR-2026-0003

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Medina, C. & Mensah, K. (2026). Detecting Silent Tool Failures from Output Distributions. In Proceedings of the 1st Workshop on Reliable Tool-Using Agents (RTUA 2026) (pp. 19–24). CONTINUUM Proceedings. doi:10.xxxx/ctm.pr.2026.0003

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Abstract

Some tool failures return plausible but wrong output and raise no error. We detect such silent failures by comparing the distribution of tool outputs against a rolling reference and flagging shifts. On three deployed tools the detector finds 71% of injected faults with a 2% false-alarm rate.

Keywords silent failures · monitoring · tool outputs

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CTM-PR-2026-0003.pdf

Paper · PDF · pp. 19–24

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Medina, C. & Mensah, K. (2026). Detecting Silent Tool Failures from Output Distributions. In Proceedings of the 1st Workshop on Reliable Tool-Using Agents (RTUA 2026) (pp. 19–24). CONTINUUM Proceedings. doi:10.xxxx/ctm.pr.2026.0003

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