A guide to asynchronous and concurrent programming in Rust, where tasks can make progress independently or wait for work without blocking everything else. It covers async functions, Tokio, threads, channels, and shared state.

Use it when writing async Rust services, spawning tasks, communicating through channels, or sharing data safely between concurrent tasks.

It helps avoid common mistakes when Rust code performs multiple operations at once or waits for input, files, or network requests. Its documented references support more reliable decisions about these patterns.

async — Skill for Claude Code by vinnie357

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add vinnie357/claude-skills --skill async

Clone the repo

git clone --depth 1 https://github.com/vinnie357/claude-skills

Made for: Claude Code.

Or install rust, the plugin that ships this one along with the rest of its 6 skills, 2 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vinnie357/claude-skills/async.svg)](https://agentmods.dev/skills/vinnie357/claude-skills/async)

Your own site

<a href="https://agentmods.dev/skills/vinnie357/claude-skills/async"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/async.svg" alt="Measured on agentmods" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 182 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00035	$0.00182
Opus 5	$0.00017	$0.00091
Sonnet 5	$0.00007	$0.00036
Haiku 4.5	$0.00003	$0.00018

Measured 8d ago against content hash 7289b3ea19e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

async scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/languages/rust/skills/async/SKILL.md · 20 lines

What it actually says

Rust Async and Concurrency

Async functions, tokio runtime, streams, threads, channels, and shared state.

For async patterns, concurrency primitives, and shared state examples, see references/async.md.

Anti-fabrication

This skill follows core:anti-fabrication. Every claim about async/await behavior, the tokio runtime, and std concurrency primitives is verified against the Async Book and tokio documentation cited in sources.md — not inferred from generic familiarity with the ecosystem. Before asserting a tokio API or concurrency behavior this skill and its references do not cover, check the installed crate version's docs.rs page rather than guessing.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/async.md 2.6 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 20 lines · 35 tokens per session scan A 7289b3ea19e8

Subscribe to this mod's changes

async is a skill published in the GitHub repository vinnie357/claude-skills (25 stars, last pushed 2d ago), licensed MIT. It adds 35 tokens to every session and 182 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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