arXiv AI By Kosei Horikawa, Hao Li, Yutaro Kashiwa, Youssef Esseddiq Ouatiti, Mohammed Sayagh, Bram Adams, Hajimu Iida, Ahmed E. Hassan

Agent or Human? Detecting Commits by AI Coding Agents in the Absence of Authorship Signatures

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The study examines whether commits made by AI coding agents can be distinguished from human commits when authorship signatures are removed. Using nearly 8 million commits from over a thousand repositories, the authors find that detectors can achieve a ROC AUC of up to 0.859, largely driven by message verbosity and change size rather than code content. However, precision remains low (≈0.332) and detection performance drops on held‑out agents, indicating limited reliability without explicit attribution.

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