arXiv AI By Yunlong Wang, Alyssa Wu, Cuiyun Gao, Jia Feng, Songyuanyi Lu, Zhichao Hu

FeatureArc: Benchmarking Coding Agents on Evolving Features

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FeatureArc is a new benchmark that evaluates coding agents on the evolution of software features, requiring agents to extend a feature across multiple stages while preserving earlier functionality. The benchmark uses a pipeline that constructs tasks from real repository histories, validates fail‑to‑pass and pass‑to‑pass tests, and covers four programming languages. In tests on 73 tasks, agents performed well on the first stage (62.7% success) but dropped to 28.5% when the entire feature was evaluated, with inherited defects causing most failures.

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