arXiv Computation and Language By Haocheng Xia, Eugene Wu, Yongjoo Park

Passes Alone, Fails Together: Benchmarking Semantic Coordination in Parallel LLM-Agent Development

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Parallel coding agents can produce patches that work individually but fail when merged, a problem arising when one agent alters an interface or rule another agent depends on. The authors introduce *stale*, a benchmark for semantic coordination, evaluating patches both alone and in combination across synthetic tasks, real Django pull‑request pairs, and constructed tasks. While only one of 417 mined Django pairs showed interference after grading corrections, interference appeared in 97% of runs on constructed tasks, and a message describing the concurrent change recovered 82% of those runs.

Machine-generated by The Flow from the publisher's headline and feed description — not written or checked by a human. The full article lives at arXiv Computation and Language.

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