actionbook/rust-skills

unsafe-checker

CRITICAL: Use for unsafe Rust code review and FFI.

All-time #4880 Trending #5969 First seen Jan 20, 2026

8-week activity · all time api

Installation

$ npx skills add actionbook/rust-skills --skill unsafe-checker

View on skills.sh ↗ GitHub repository ↗

Summary

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?

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More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared

Cursor Not declared

Codex Not declared

GitHub Copilot Not declared

Windsurf Not declared

Gemini CLI Not declared

Cline Not declared

OpenCode Not declared

Also listed on

Alternate registries and mirrors of this skill.

Smithery smithery/actionbook/unsafe-checker

npx skills add smithery/actionbook --skill unsafe-checker

Repository health

Stars 1.4K

License LICENSE

Default branch main

Open issues 14

Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

Allowed toolsRead, Grep, Glob

Package contents

Files included with this skill beyond the listing page.

skill md SKILL.md 2,490 B
docs AGENTS.md 5,242 B
docs SUMMARY.md 416 B

History

Jan 20, 2026 First seen on skills.sh
Sep 9, 2026 First recorded snapshot · 2,700 installs

SKILL.md

Display the following ASCII art exactly as shown. Do not modify spaces or line breaks:

⚠️ **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

// 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.

npx skills add actionbook/rust-skills --skill unsafe-checker