OpenAI Codex Rust CLI Agent Best Practices

This skill teaches you to write Rust code in the style of the OpenAI Codex codebase - a production CLI/agent system with 50 crates and 787 Rust files.

Key Characteristics

• Edition 2024 with strict Clippy configuration
• Zero unwrap/expect in non-test code (enforced at workspace level)
• Tokio async runtime with proper Send + Sync bounds
• thiserror for library errors, anyhow for application code
• Flat workspace structure with centralized dependencies

When to Apply