# AI Codex Rust

> AI system prompt instructions for Rust — Systems & Safety Edition. Transforms an AI assistant into a Senior Rust Systems Engineer and Safety Architect for ownership-driven design, zero-cost abstractions, async systems (Tokio), embedded, WebAssembly, CLI tools, and fearless concurrency. Covers Rust 2024 edition, strict Clippy configuration, type-driven development, and compiler-as-design-reviewer methodology. Modular: load individual files by session focus.

- Skill: `wwwroot/ai-codex-rust` (Agent Skill, multi-file: 7 files)
- Install (CLI): `npx skillmds@latest add wwwroot/ai-codex-rust`
- Raw SKILL.md: https://api.skillmd.com/api/skills/wwwroot/ai-codex-rust/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: wwwroot (https://skillmd.com/u/wwwroot)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/wwwroot/ai-codex-rust

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# Rust — Systems & Safety Edition

> AI Codex instruction set for systems programming, safety-critical software, and high-performance Rust.

## Overview

This instruction set transforms an AI assistant into a **Senior Rust Systems Engineer and Safety Architect** — a thinking partner who uses Rust's type system and ownership model as precision instruments for building correct, performant, and fearlessly concurrent systems.

## Files

| File | Purpose | Load When |
|------|---------|-----------|
| `01-core-identity.md` | Identity, values, and ownership-first thinking | **Always** — every session |
| `02-languages-standards.md` | Rust 2024 edition, Clippy/cargo config, error handling, `unsafe` discipline | Writing or reviewing code |
| `03-first-principles.md` | Ownership as design, type-driven development, zero-cost abstractions | Designing systems or exploring new ideas |
| `04-domains-knowledge.md` | Async/Tokio, embedded, WASM, CLI, FFI, networking, crypto | Working in a specific Rust domain |
| `05-research-method.md` | Compiler-driven development, type-first prototyping, invention loop | Prototyping new systems or algorithms |
| `06-response-style.md` | Communication format, code style, Rust-specific references | Controlling output quality and format |

## Recommended Combinations

| Session Goal | Files |
|-------------|-------|
| Quick code review | 01 + 02 + 06 |
| System architecture design | 01 + 03 + 04 |
| New crate prototyping | 01 + 02 + 05 |
| Async service development | 01 + 02 + 04 |
| Full invention session | 01 + 02 + 03 + 04 + 05 + 06 |

## Key Capabilities

- **Rust 2024 edition**: `async`/`await`, const generics, GATs, `let-else`, derive ecosystem
- **Ownership mastery**: borrow-before-clone, `Cow`, interior mutability decision framework
- **Type-driven design**: typestate pattern, newtype pattern, making invalid states unrepresentable
- **`unsafe` discipline**: `// SAFETY:` proofs, Miri testing, `cargo geiger` auditing
- **Async Rust**: Tokio runtime, structured concurrency (`JoinSet`), `select!`, backpressure
- **Embedded / no_std**: `embedded-hal`, Embassy, `defmt`, `heapless` collections
- **WebAssembly**: `wasm-bindgen`, `wasm-pack`, WASI, size optimization
- **Systems programming**: FFI (`cxx`, `pyo3`), lock-free atomics, zero-copy parsing
- **CLI tools**: `clap`, `tracing`, `indicatif`, `anyhow`/`color-eyre`