---

name: rust description: Rust Constraints. No unwrap, Idiomatic Iterators, Tokio, Error Handling.

Lang: Rust

Rules

1. Safety: NEVER use .unwrap(). Use ? propagation or .expect("msg").
2. Style: Prefer Iterators (.map().collect()) over for loops.
3. Async: Assume tokio. Use .await. Never block async threads.
4. Errors: Use anyhow::Result for apps, thiserror for libs.
5. Tests: Co-locate unit tests in mod tests with #[cfg(test)].
6. Clippy: Code must be strictly clippy-compliant (idiomatic).

Workflow

• Use skill workflow-env before build/run commands.
• Build: cargo build --release
• Test: cargo test
• Format: cargo fmt

Documentation Access

When you need to verify ownership rules, async runtime behavior, or std library APIs:

1. Primary (Context7): /websites/doc_rust-lang_stable_book
2. Fallback: https://doc.rust-lang.org

Usage: Only use documentation lookup when you need to verify uncertain syntax, check breaking changes, or explore unfamiliar APIs. Apply this skill's established rules directly for routine tasks.