Individual skill

rust-ffi-safe-wrappers

Design and review Rust FFI boundaries that keep raw declarations isolated behind safe ownership, lifetime, error, and cleanup wrappers. Use when writing, refactoring, or reviewing unsafe extern blocks, C ABI wrappers, repr(C) types, CString, CStr, raw handles, Drop cleanup, bindgen, cbindgen, or panic-safe foreign boundaries.

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Repository last updated: Nov 6, 2026
License: Apache-2.0

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# Rust FFI Safe Wrappers

Use this skill to wrap foreign interfaces in Rust APIs that make ownership,
lifetimes, errors, and cleanup explicit. FFI code should be unsafe at the raw
boundary and safe for normal Rust callers.

## Core Workflow

1. Separate raw declarations from safe wrappers. Put raw `unsafe extern`
   bindings in a small private module.
2. Verify ABI, type layout, calling convention, ownership, nullability,
   threading, and error conventions against the foreign header or docs.
3. Use `unsafe extern "C"` blocks for modern Rust, especially Rust 2024 edition
   code. Leave safety-conditional items unqualified or explicitly `unsafe`, and