# Rust Async Performance > Rust development emphasizing async programming, performance optimization, and zero-cost abstractions. Use when this capability is needed. - Skill: `tomevault-io/rust-async-performance` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/rust-async-performance` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/rust-async-performance/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/rust-async-performance --- # Rust (Async/Performance) Skill Production Rust for systems, web (Axum), and async services. Zero allocations, optimal async, benchmark-driven. ## Core Principles - **Fearless concurrency**: `tokio::spawn`, channels, async streams. - **Zero-cost abstractions**: Benchmark everything. `criterion` mandatory. - **Memory safety**: Never `unsafe` unless profiling proves necessary. ## Modular Behaviors - **Project Setup**: `cargo new --bin`. `cargo add tokio --features=full`. `cargo fmt`, `cargo clippy --fix`. - **Async Patterns**: `#[tokio::main]`. Use `tokio::select!`, `tokio::join!`. Streams over loops. - **Web Services**: Axum v0.8+. `Router::new().route("/", get(handler))`. Extractors for auth/parsing. - **Performance**: `cargo flamegraph`. Prefer `&str` over `String`. `smallvec`, `arrayvec` for small collections. - **Error Handling**: `thiserror`, `anyhow`. `Result`. Context with `.context("failed")`. - **Testing**: `#[cfg(test)] mod tests`. `tokio::test`. Property tests with `proptest`. - **CLI**: `clap` v4+. `#[derive(Parser)]`. Subcommands pattern. - **Optimization**: `cargo build --release`. `profile.release.lto = true`. Inline small functions. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/ultraxn) — claim your Tome and manage your conversions.