rust

name	rust
description	Expert in Rust development with focus on safety, performance, async programming, and systems code.

Rust

Use this skill when working on Rust code, especially backend, async, or systems-level logic.

Core Principles

• Prefer safety and clarity over cleverness.
• Use Result and Option properly.
• Keep functions small and focused.
• Use ownership and borrowing to avoid unnecessary cloning.

Async

• Prefer tokio for async work when the project already uses it.
• Manage cancellation and shared state explicitly.
• Test async code with #[tokio::test] where appropriate.

Error Handling

• Return meaningful errors.
• Propagate recoverable failures with ?.
• Define custom error types when the domain needs them.

Performance

• Avoid unnecessary allocations.
• Prefer iterators and references over copies where readable.
• Profile before optimizing.

Testing

• Write unit tests for helpers and pure logic.
• Add integration tests for cross-module behavior.
• Keep test cases small and deterministic.