Individual skill
rust-async-task-design
Design and review Rust async code around task ownership, suspension points, cancellation, blocking work, and runtime boundaries. Use when writing, refactoring, or reviewing futures, async functions, Tokio tasks, spawn, JoinHandle, Send futures, async traits, cancellation, or mutexes across await points.
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- Last checked
- Nov 4, 2026
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- Nov 6, 2026
- License
- Apache-2.0
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- rust,async,tokio,futures,tasks Declared skill tag
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# Rust Async Task Design
Use this skill to make Rust async code explicit about task ownership, suspension
points, blocking work, and cancellation. Async is a concurrency model, not a
default replacement for threads or a performance guarantee.
## Core Workflow
1. Identify the async boundary: runtime entrypoint, handler, client call,
stream, background task, or trait method.
2. Mark every `.await` as a possible suspension point. Check what state is held
across it.
3. Use `tokio::spawn(async move { ... })` only when the task can own everything
it needs and its future is `Send + 'static` on the selected runtime.