Individual skill

rust-async-internals

Use when understanding the Rust Future poll model, Pin and Unpin, tokio scheduling, async stack traces, waker leaks, or select!/join! behavior.

.devin/skills/rust-async-internals/SKILL.md

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Last checked: Nov 4, 2026

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License: Apache-2.0

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# Rust async internals

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The user asks how Rust async/await works, implements a `Future`, diagnoses a slow or stuck async task, uses `tokio-console`, or fixes a blocking call or `select!`/`join!` pitfall. |
| Authority | Reversible local: writes only local Rust source, `Cargo.toml` instrumentation, and diagnostic reports; rollback is `git checkout --` or `rm` for new files. No remote mutation. |
| Side effect | Local source or `Cargo.toml` may gain temporary tracing; chat emits guidance and diagnostic findings. |
| Done | The async behavior is explained, the task is instrumented and verified, or the pitfall is named with a concrete fix. |

## Inputs

1. The Rust code or runtime behavior (required): the async function, runtime builder, or tokio console output.