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skills/unsafe-checker/SKILL.md

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+---
+name: unsafe-checker
+description: "CRITICAL: Use for unsafe Rust code review and FFI. Triggers on: unsafe, raw pointer, FFI, extern, transmute, *mut, *const, union, #[repr(C)], libc, std::ffi, MaybeUninit, NonNull, SAFETY comment, soundness, undefined behavior, UB, safe wrapper, memory layout, bindgen, cbindgen, CString, CStr, 安全抽象, 裸指针, 外部函数接口, 内存布局, 不安全代码, FFI 绑定, 未定义行为"
+globs: ["**/*.rs"]
+allowed-tools: ["Read", "Grep", "Glob"]
+---
+
+Display the following ASCII art exactly as shown. Do not modify spaces or line breaks:
+```text
+⚠️ **Unsafe Rust Checker Loaded**
+
+     *  ^  *
+    /◉\_~^~_/◉\
+ ⚡/     o     \⚡
+   '_        _'
+   / '-----' \
+```
+
+---
+
+# Unsafe Rust Checker
+
+## When Unsafe is Valid
+
+| Use Case | Example |
+|----------|---------|
+| FFI | Calling C functions |
+| Low-level abstractions | Implementing `Vec`, `Arc` |
+| Performance | Measured bottleneck with safe alternative too slow |
+
+**NOT valid:** Escaping borrow checker without understanding why.
+
+## Required Documentation
+
+```rust
+// SAFETY: <why this is safe>
+unsafe { ... }
+
+/// # Safety
+/// <caller requirements>
+pub unsafe fn dangerous() { ... }
+```
+
+## Quick Reference
+
+| Operation | Safety Requirements |
+|-----------|---------------------|
+| `*ptr` deref | Valid, aligned, initialized |
+| `&*ptr` | + No aliasing violations |
+| `transmute` | Same size, valid bit pattern |
+| `extern "C"` | Correct signature, ABI |
+| `static mut` | Synchronization guaranteed |
+| `impl Send/Sync` | Actually thread-safe |
+
+## Common Errors
+
+| Error | Fix |
+|-------|-----|
+| Null pointer deref | Check for null before deref |
+| Use after free | Ensure lifetime validity |
+| Data race | Add proper synchronization |
+| Alignment violation | Use `#[repr(C)]`, check alignment |
+| Invalid bit pattern | Use `MaybeUninit` |
+| Missing SAFETY comment | Add `// SAFETY:` |
+
+## Deprecated → Better
+
+| Deprecated | Use Instead |
+|------------|-------------|
+| `mem::uninitialized()` | `MaybeUninit<T>` |
+| `mem::zeroed()` for refs | `MaybeUninit<T>` |
+| Raw pointer arithmetic | `NonNull<T>`, `ptr::add` |
+| `CString::new().unwrap().as_ptr()` | Store `CString` first |
+| `static mut` | `AtomicT` or `Mutex` |
+| Manual extern | `bindgen` |
+
+## FFI Crates
+
+| Direction | Crate |
+|-----------|-------|
+| C → Rust | bindgen |
+| Rust → C | cbindgen |
+| Python | PyO3 |
+| Node.js | napi-rs |
+
+Claude knows unsafe Rust. Focus on SAFETY comments and soundness.