devdanzin/cext-review-toolkit

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# C Extension Review Toolkit

A [Claude Code](https://docs.anthropic.com/en/docs/claude-code) plugin for reviewing CPython C extensions -- finding API misuse, memory safety bugs, compatibility issues, and correctness problems specific to code that *consumes* the Python/C API.

Built for the specific concerns of C extension authors -- reference counting from the caller's perspective, borrowed reference lifetimes, module state management, type slot correctness, stable ABI compliance, and version compatibility -- not general-purpose C analysis.

## Why a Separate Tool?

| Concern | CPython internals (cpython-review-toolkit) | C extensions (this toolkit) |
|---------|-------------------------------------------|----------------------------|
| **Perspective** | Code that *implements* the C API | Code that *calls* the C API |
| **Parsing** | Regex (PEP 7 code is regular) | Tree-sitter (extension code varies wildly) |
| **Top bug class** | Refcount leaks in runtime code | Borrowed refs held across callbacks |
| **Module state** | N/A (CPython manages its own) | Core concern -- init style, global state |
| **Type definitions** | Part of the runtime | Must follow slot contracts correctly |
| **ABI** | Defines the ABI | Must comply with the ABI |
| **Dependencies** | stdlib only | tree-sitter, tree-sitter-c |

## Installation

View full repository on GitHub →