rust-best-practices
Use when writing, modifying, or reviewing Rust code. ALWAYS invoke before Rust edits; covers Microsoft Pragmatic Rust guidance for error handling, API design, performance, and idiomatic patterns.
- Installs
- 89
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/majiayu000/spellbook --skill rust-best-practices- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads rust-best-practices automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Rust Best Practices
Based on Microsoft Pragmatic Rust Guidelines and Rust community standards.
Core Principles
- Leverage the type system — Use types to make invalid states unrepresentable
- Embrace ownership — Work with the borrow checker, not against it
- Explicit over implicit — Be clear about fallibility, mutability, and lifetimes
- Zero-cost abstractions — Use iterators, generics, and traits without runtime cost
- Fail fast, recover gracefully — Validate early, handle errors explicitly
Error Handling
Use thiserror for Libraries
use thiserror::Error;
#[derive(Error, Debug)]
pub enum MyError {
#[error("IO error: {0}")]
Io(#[from] std::io::Error),
#[error("Parse error at line {line}: {message}")]
Parse { line: usize, message: String },
#[error("Not found: {0}")]
NotFound(String),
}
Use anyhow for Applications
use anyhow::{Context, Result};
fn main() -> Result<()> {
let config = load_config()
.context("Failed to load configuration")?;
run_app(config)?;
Ok(())
}
Never Panic in Libraries
// ❌ BAD
pub fn get_item(index: usize) -> &Item {
&self.items[index] // Panics on out-of-bounds
}
// ✅ GOOD
pub fn get_item(&self, index: usize) -> Option<&Item> {
self.items.get(index)
}
// ✅ GOOD - when you need Result
pub fn get_item(&self, index: usize) -> Result<&Item, Error> {
self.items.get(index).ok_or(Error::NotFound(index))
}
API Design
Use Builder Pattern for Complex Configs
pub struct Client {
url: String,
timeout: Duration,
retries: u32,
}
impl Client {
pub fn builder(url: impl Into<String>) -> ClientBuilder {
ClientBuilder {
url: url.into(),
timeout: Duration::from_secs(30),
retries: 3,
}
}
}
pub struct ClientBuilder {
url: String,
timeout: Duration,
retries: u32,
}
impl ClientBuilder {
pub fn timeout(mut self, timeout: Duration) -> Self {
self.timeout = timeout;
self
}
pub fn retries(mut self, retries: u32) -> Self {
self.retries = retries;
self
}
pub fn build(self) -> Client {
Client {
url: self.url,
timeout: self.timeout,
retries: self.retries,
}
}
}
Use Newtype Pattern
// ❌ BAD - primitive obsession
fn create_user(name: String, email: String, age: u32) -> User { ... }
// ✅ GOOD - newtype wrappers
pub struct Username(String);
pub struct Email(String);
pub struct Age(u32);
impl Email {
pub fn new(email: impl Into<String>) -> Result<Self, ValidationError> {
let email = email.into();
if email.contains('@') {
Ok(Self(email))
} else {
Err(ValidationError::InvalidEmail)
}
}
}
fn create_user(name: Username, email: Email, age: Age) -> User { ... }
Accept impl Trait for Flexibility
// ❌ BAD - overly specific
pub fn process(items: Vec<String>) { ... }
// ✅ GOOD - accept any iterable
pub fn process(items: impl IntoIterator<Item = impl AsRef<str>>) {
for item in items {
println!("{}", item.as_ref());
}
}
References
- Microsoft Pragmatic Rust Guidelines
- Rust API Guidelines
- The Rust Book
- references/advanced.md — performance, async, testing, and anti-pattern examples
FAQ
What does the rust-best-practices skill do?
Use when writing, modifying, or reviewing Rust code. ALWAYS invoke before Rust edits; covers Microsoft Pragmatic Rust guidance for error handling, API design, performance, and idiomatic patterns.
How do I install rust-best-practices?
Run npx skills add https://github.com/majiayu000/spellbook --skill rust-best-practices in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/rust-best-practices/ (personal) or .claude/skills/rust-best-practices/ (project).
Which AI agents can use rust-best-practices?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is rust-best-practices safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains rust-best-practices?
It is published by majiayu000 in majiayu000/spellbook. It has 89 recorded installs.
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