Using LLMs to find Python C-extension bugs

20 hours ago

Daniel Diniz used Claude Code to find over 500 bugs in Python C-extensions across 44 projects, with a low false positive rate.
He developed the cext-review-toolkit with 13 specialized agents targeting issues like reference counts, GIL, and exceptions, and worked closely with maintainers to prioritize fixes.
The approach emphasizes human oversight, offering maintainers control over bug reporting and fixes to prevent burnout and ensure high-quality, useful reports.

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