rust-engineer

Jeffallan/claude-skillsCoding AgentsReview advisedSnapshot ed1b32b0ae76

Summary

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.

SKILL.md

Rust Engineer

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.

Core Workflow

Analyze ownership — Design lifetime relationships and borrowing patterns; annotate lifetimes explicitly where inference is insufficient
Design traits — Create trait hierarchies with generics and associated types
Implement safely — Write idiomatic Rust with minimal unsafe code; document every unsafe block with its safety invariants
Handle errors — Use Result/Option with ? operator and custom error types via thiserror
Validate — Run cargo clippy --all-targets --all-features, cargo fmt --check, and cargo test; fix all warnings before finalising

Reference Guide

Load 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

// 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)
    }
}

use 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)

rust-engineer

Summary

SKILL.md

Rust Engineer

Core Workflow

Reference Guide

Key Patterns with Examples

Ownership & Lifetimes

Trait-Based Design

Error Handling with `thiserror`

Async / Await with Tokio

Validation Commands

Constraints

MUST DO

MUST NOT DO

Output Templates

Knowledge Reference

Related skills

rust-engineer

Summary

Rust Engineer

Core Workflow

Reference Guide

Key Patterns with Examples

Ownership & Lifetimes

Trait-Based Design

Error Handling with thiserror

Async / Await with Tokio

Validation Commands

Constraints

MUST DO

MUST NOT DO

Output Templates

Knowledge Reference

Related skills

Error Handling with `thiserror`