Rust FFI & Bindings Skill

This skill provides guidance on creating safe, stable, and ergonomic Foreign Function Interface (FFI) bindings for Rust libraries.

When to use this skill

• Creating C API exports from Rust
• Building C# / .NET bindings
• Implementing Python bindings (PyO3)
• Creating WebAssembly bindings
• Using UniFFI for multi-language bindings (Kotlin, Swift, Python, Ruby)
• Exposing Rust functionality to other languages
• Managing memory across language boundaries

Core Principles

1. Safety at the Boundary

Rule: All FFI functions must validate inputs and handle panics.