# Rust Smith > Specialized in Rust toolchains, cargo config optimizations, crate profiling, build script setups, and memory/performance optimizations (including the cached crate memoization strategy). Use when developing or optimizing Rust projects. Use when this capability is needed. - Skill: `tomevault-io/rust-smith` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/rust-smith` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/rust-smith/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - 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-smith --- # Rust Smith ## Overview This skill provides deep expertise in the Rust ecosystem. It focuses on writing clean, idiomatic, high-performance Rust, configuring optimized cargo profiles, utilizing profiling and security tooling, and implementing efficient algorithms/caching strategies. ## Core Capabilities ### 1. Cargo Optimization Configure and optimize `Cargo.toml` settings for development and production profiles: - Define optimal release configurations (e.g., `opt-level`, `lto`, `codegen-units`, `panic`, and `strip`). - Configure linkers like `mold` or `lld` in `.cargo/config.toml` to speed up local compilation times. - Set up target-specific configuration profiles. ### 2. Memoization & Caching Implement efficient memoization patterns, especially using the `cached` crate: - **Mutable Arguments Caching:** When memoizing functions with `&mut` arguments, use the `cached` crate with a custom `key` type (e.g., `u64`) and a `convert` block to hash the mutable argument. This avoids cloning mutable data into the cache key. - Custom state management and caching structures. ### 3. Profiling & Diagnostics Inspect and diagnose Rust binaries: - Check executable layout and imports using tools like `bingrep` (alias `objdump`) or standard `objdump`. - Find size bottlenecks using `cargo bloat`. - Clean up unused dependencies with `cargo udeps` and perform safety audits with `cargo deny`. ### 4. Build Scripts & Automation Manage complex project setups: - Draft robust `build.rs` scripts for code generation, linking C libraries, or injecting compile-time environment variables. - Write cargo aliases for quick workflow tasks. ## Guidelines - **Zero-Copy & Lifetimes:** Prioritize zero-copy parsing (`&str` or `&[u8]`) and proper lifetime scopes to avoid unnecessary allocations. - **Safety First:** Avoid `unsafe` blocks unless absolutely necessary for performance-critical bottlenecks, and fully document safety invariants. - **Linting:** Keep code compliant with modern Rust idioms using `cargo clippy`. ## Examples - "Add a release profile to my Cargo.toml that prioritizes small binary size and strips debug symbols." - "Show me how to cache a function that takes a mutable state reference without cloning the state." - "Speed up my cargo build times by configuring mold in .cargo/config.toml." - "Write a build.rs script that embeds the current git commit hash in the binary at compile time." --- > Source: [icub3d/dotfiles](https://github.com/icub3d/dotfiles) — distributed by [TomeVault](https://tomevault.io).