# Rust

> Use this guide when working on Rust changes in the FAST monorepo.

- Skill: `microsoft/rust` (Agent Skill)
- Install (CLI): `npx skillmds@latest add microsoft/rust`
- Raw SKILL.md: https://api.skillmd.com/api/skills/microsoft/rust/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: Microsoft (https://skillmd.com/u/microsoft)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/microsoft/rust

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# Working with the Rust crate and the Rust NodeJS CLI

The primary location for the Rust logic should exist within a crate. If the logic is made accessible in the NodeJS environment via wrapping the crate and using a wasm bindgen, as much as possible any logic that exists in Rust should not be duplicated in JavaScript/TypeScript.

## Breaking changes

Understand [semver](https://semver.org/) and check the crate and package version. If the version is currently in a prerelease state, update the APIs with breaking changes as necessary and ensure that any generated pull request descriptions capture this.