Does it help with memory safety in unsafe blocks?

Yes, it provides specific safety documentation patterns and memory management rules (like ownership transfer and buffer patterns) to prevent leaks and undefined behavior.

Is it suitable for multi-DLL projects?

Absolutely. It includes specific considerations for allocator consistency, ensuring each DLL frees the memory it allocated, and avoiding unstable Rust types across boundaries.

What standards does this Rust FFI skill follow?

The skill follows Microsoft's Pragmatic Rust guidelines, which focus on practical, safe, and maintainable Foreign Function Interface and cross-language interoperability.

Can it help generate C header files?

It includes configurations and best practices for using cbindgen to automatically generate C/C++ headers from your Rust structs and functions.

How do I test my FFI code with this skill?

The skill suggests round-trip testing patterns and recommends using Miri (cargo +nightly miri test) to detect potential undefined behavior in FFI code.

Pragmatic Rust FFI

Name: Pragmatic Rust FFI
Author: vanyastaff

byvanyastaff

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Developer Tools

Implements Microsoft's pragmatic guidelines for safe and efficient Foreign Function Interface (FFI) development between Rust and C/C++.

This skill equips Claude with specialized knowledge of Microsoft's Pragmatic Rust FFI guidelines, enabling it to write robust, C-compatible Rust code. It provides standardized patterns for cross-language memory management, opaque handle creation, and ABI-safe data structures using repr(C). It is particularly useful for developers building dynamic libraries (cdylib), multi-DLL systems, or wrapping existing C/C++ libraries, ensuring that unsafe code blocks are properly documented and follow industry-standard memory safety protocols.

Key Features

01Implements safe wrappers for calling external C functions with proper safety documentation

02Generates FFI-safe error handling patterns and thread-local error status mechanisms

03Manages cross-language memory ownership and allocation consistency across DLL boundaries

04Assists with cbindgen configuration for automated C/C++ header generation

05Provides C-compatible ABI patterns using repr(C) and explicit discriminants

060 GitHub stars

Use Cases

01Developing safe Rust wrappers for legacy C libraries using Miri for validation

02Building multi-DLL systems where Rust modules must communicate across binary boundaries

03Creating high-performance Rust plugins for existing C++ applications

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add vanyastaff/paramdef rust-ffi

For use in Claude.ai and ChatGPT

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