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Study Finds Coding Agents Struggle Most With Bug Fixes, But Business-Logic Link Is Unproven

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A developer tested the claim that coding agents fail at bug fixing because they lack an understanding of business logic. Large studies of AI-generated pull requests, including one of about 33,000 PRs, show bug-fix and performance tasks merge least often. Rejection reasons reported in one sample were mostly reviewer abandonment rather than agent errors, and a separate analysis found nearly half of bug-fix PRs were rejected. None of the datasets records whether a fix violated a business rule, so the evidence is indirect. Practitioner accounts describe agents misreading bugs and breaking other behavior, but these remain anecdotal and are not systematic measurements.

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