rust-engineer
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.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/jeffallan/claude-skills --skill rust-engineer- 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-engineer automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
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
unsafeblock with its safety invariants - Handle errors — Use
Result/Optionwith?operator and custom error types viathiserror - Validate — Run
cargo clippy --all-targets --all-features,cargo fmt --check, andcargo 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 |
| 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 |
Key Patterns with Examples
Ownership & Lifetimes
// 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()
}
Trait-Based Design
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)
}
}
Error Handling with thiserror
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)
}
Async / Await with Tokio
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)),
);
}
Validation Commands
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)
Constraints
MUST DO
- Use ownership and borrowing for memory safety
- Minimize unsafe code (document all unsafe blocks with safety invariants)
- Use type system for compile-time guarantees
- Handle all errors explicitly (
Result/Option) - Add comprehensive documentation with examples
- Run
cargo clippyand fix all warnings - Use
cargo fmtfor consistent formatting - Write tests including doctests
MUST NOT DO
- Use
unwrap()in production code (preferexpect()with messages) - Create memory leaks or dangling pointers
- Use
unsafewithout documenting safety invariants - Ignore clippy warnings
- Mix blocking and async code incorrectly
- Skip error handling
- Use
Stringwhen&strsuffices - Clone unnecessarily (use borrowing)
Output Templates
When implementing Rust features, provide:
- Type definitions (structs, enums, traits)
- Implementation with proper ownership
- Error handling with custom error types
- Tests (unit, integration, doctests)
- Brief explanation of design decisions
Knowledge Reference
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
FAQ
What does the rust-engineer skill do?
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.
How do I install rust-engineer?
Run npx skills add https://github.com/jeffallan/claude-skills --skill rust-engineer 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-engineer/ (personal) or .claude/skills/rust-engineer/ (project).
Which AI agents can use rust-engineer?
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-engineer safe to install?
Security partners have reviewed it: Gen Agent Trust Hub flagged risks; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains rust-engineer?
It is published by jeffallan in jeffallan/claude-skills. It has 6,312 recorded installs.
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