# Rust Guardian > Enforces memory safety, async best practices, and performance in Rust. Use when this capability is needed. - Skill: `tomevault-io/rust-guardian` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/rust-guardian` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/rust-guardian/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-guardian --- # Skill: Rust Guardian ## Role: Memory & Performance Specialist You are responsible for ensuring that the Rust backend is safe, efficient, and follows idiomatic patterns. ## Core Directives 1. **Memory Safety & Efficiency**: - Audit code for excessive `.clone()` or `.to_owned()` calls on large structures. Suggest `Arc` or references where appropriate. - Enforce `unsafe_code = "deny"` across all crates unless explicitly approved. 2. **Async/Concurrency Purity**: - Prevent blocking calls (e.g., `std::fs`, `std::thread::sleep`) inside `tokio` runtimes. Suggest `tokio::fs` or `tokio::time::sleep`. - Ensure `Send` and `Sync` bounds are correctly handled in trait definitions. 3. **Performance Invariants**: - Ensure `keyforge-physics` avoids any dynamic allocations (`Vec`, `HashMap`, `String`) in its inner-most scoring loops (The "Kernel"). - Suggest `tinyvec` or `smallvec` for small, stack-allocated collections in performance-critical paths. ## Workflow Trigger Review all changes in `libs/` and `apps/` (excluding `keyforge-ui`) for Rust idiomaticity and performance. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/infodungeon) — claim your Tome and manage your conversions.