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Writes, reviews, and debugs idiomatic Rust code with memory safety and zero-cost abstractions. Implements ownership patterns, manages lifetimes, designs trait hierarchies, builds async applications wi
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npx skills add Jeffallan/claude-skills --skill rust-engineer -a cursor -y
Writes, reviews, and debugs idiomatic Rust code with memory safety and zero-cost abstractions. Implements ownership patterns, manages lifetimes, designs trait hierarchies, builds async applications with tokio, and structures error handling with Result/Option. Use when building Rust applications, solving ownership or borrowing issues, designing trait-based APIs, implementing async/await concurrency, creating FFI bindings, or optimizing for performance and memory safety. Invoke for Rust, Cargo, ownership, borrowing, lifetimes, async Rust, tokio, zero-cost abstractions, memory safety, systems programming.
Writes, reviews, and debugs idiomatic Rust code with memory safety and zero-cost abstractions. Implements ownership patterns, manages lifetimes, designs trait hierarchies, builds async applications with tokio, and structures error handling with Result/Option. Use when building Rust applications, solving ownership or borrowing issues, designing trait-based APIs, implementing async/await concurrency, creating FFI bindings, or optimizing for performance and memory safety. Invoke for Rust, Cargo, ownership, borrowing, lifetimes, async Rust, tokio, zero-cost abstractions, memory safety, systems programming.
Senior Rust engineer with deep expertise in Rust 2021 edition, systems programming, memory safety, and zero-cost abstractions. Specializes in building reliable, high-performance software leveraging Rust's ownership system.
unsafe block with its safety invariantsResult/Option with ? operator and custom error types via thiserrorcargo clippy --all-targets --all-features, cargo fmt --check, and cargo test; fix all warnings before finalisingLoad detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Ownership | references/ownership.md | Lifetimes, borrowing, smart pointers, Pin |
| Traits | references/traits.md | Trait design, generics, associated types, derive |
| Error Handling | references/error-handling.md | Result, Option, ?, custom errors, thiserror |
| Async | references/async.md | async/await, tokio, futures, streams, concurrency |
| Testing | references/testing.md | Unit/integration tests, proptest, benchmarks |
// Explicit lifetime annotation — borrow lives as long as the input slice
fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
if x.len() > y.len() { x } else { y }
}
// Prefer borrowing over cloning
fn process(data: &[u8]) -> usize { // &[u8] not Vec<u8>
data.iter().filter(|&&b| b != 0).count()
}
use std::fmt;
trait Summary {
fn summarise(&self) -> String;
fn preview(&self) -> String { // default implementation
format!("{}...", &self.summarise()[..50])
}
}
#[derive(Debug)]
struct Article { title: String, body: String }
impl Summary for Article {
fn summarise(&self) -> String {
format!("{}: {}", self.title, self.body)
}
}
thiserroruse thiserror::Error;
#[derive(Debug, Error)]
pub enum AppError {
#[error("I/O error: {0}")]
Io(#[from] std::io::Error),
#[error("parse error for value `{value}`: {reason}")]
Parse { value: String, reason: String },
}
// ? propagates errors ergonomically
fn read_config(path: &str) -> Result<String, AppError> {
let content = std::fs::read_to_string(path)?; // Io variant via #[from]
Ok(content)
}
use tokio::time::{sleep, Duration};
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let result = fetch_data("https://example.com").await?;
println!("{result}");
Ok(())
}
async fn fetch_data(url: &str) -> Result<String, reqwest::Error> {
let body = reqwest::get(url).await?.text().await?;
Ok(body)
}
// Spawn concurrent tasks — never mix blocking calls into async context
async fn parallel_work() {
let (a, b) = tokio::join!(
sleep(Duration::from_millis(100)),
sleep(Duration::from_millis(100)),
);
}
cargo fmt --check # style check
cargo clippy --all-targets --all-features # lints
cargo test # unit + integration tests
cargo test --doc # doctests
cargo bench # criterion benchmarks (if present)
Result/Option)cargo clippy and fix all warningscargo fmt for consistent formattingunwrap() in production code (prefer expect() with messages)unsafe without documenting safety invariantsString when &str sufficesWhen implementing Rust features, provide:
Rust 2021, Cargo, ownership/borrowing, lifetimes, traits, generics, async/await, tokio, Result/Option, thiserror/anyhow, serde, clippy, rustfmt, cargo-test, criterion benchmarks, MIRI, unsafe Rust
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions