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Agent skill

Swift Concurrency

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Implement async/await, Actors, and structured concurrency in Swift.

MITAuto-check passedMobile

Install Swift Concurrency

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill swift-concurrency -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard swift-concurrency --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/swift/swift-concurrency .claude/skills/swift-concurrency && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
swift-concurrency
GitHub stars
572
Token cost
~545 tokens
SKILL.md length
199 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Implement async/await, Actors, and structured concurrency in Swift.

  • Implementing Swift async/await
  • SKILL.md covers Priority: P0 (CRITICAL), Write Structured Async Code, Isolate State with Actors and Manage Task Lifecycle, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Structured concurrency in iOS/macOS

What it does

Swift Concurrency is an agent skill from HoangNguyen0403/agent-skills-standard. Implement async/await, Actors, and structured concurrency in Swift. Use when implementing Swift async/await, Actors, or structured concurrency in iOS/macOS.

Its SKILL.md is about 550 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/implementation.md`).

It sits in Mobile, covering iOS development and Async programming. It works with Swift, iOS and macOS. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Implementing Swift async/await
  • Structured concurrency in iOS/macOS

Example prompts

  • “/swift-concurrency”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Swift Concurrency loads about 545 tokens when it runs, and up to ~1.2k if it reads all its reference files. Until then it costs about 44 tokens; SKILL.md has 199 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~44
When it runs · the whole SKILL.md, loaded when a task matches
~545
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 199 words, ~545 tokens.

Download SKILL.mdSave it as .claude/skills/swift-concurrency/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
swift-concurrency
description
Implement async/await, Actors, and structured concurrency in Swift. Use when implementing Swift async/await, Actors, or structured concurrency in iOS/macOS.

Swift Concurrency

Priority: P0 (CRITICAL)

Write Structured Async Code

  • Async Functions: Mark with async and call with await.
  • async let: Use async let for parallel execution when multiple tasks independent.
  • Task Groups: Use withTaskGroup or withThrowingTaskGroup for spawning dynamic number of tasks.
  • Error Handling: Combine with throws. Always handle CancellationError.

See implementation examples for parallel fetch with async let and Task Groups.

Isolate State with Actors

  • Data Isolation: Use actor for shared mutable state to avoid data races.
  • @MainActor: Annotate UI classes (Views, ViewModels) with @MainActor for main thread execution. Use MainActor.run { ... } for inline UI updates in async blocks.
  • Global Actors: Use @GlobalActor for specific thread-bound resources.
  • nonisolated: Use nonisolated for methods that don't access actor state to avoid unnecessary hops.

See implementation examples for Actor-based state isolation and nonisolated methods.

Manage Task Lifecycle

  • Task Hierarchy: Inherit isolation by using Task { ... }.
  • Cancellation: Explicitly check Task.isCancelled in long loops. Use try Task.checkCancellation() for throwing functions.
  • Detached Tasks: Avoid Task.detached unless you explicitly want to break context inheritance.

Anti-Patterns

  • No synchronous work in @MainActor: not block main thread.
  • No UI updates off @MainActor: Always dispatch back to main via MainActor.
  • No ignored cancellation: Always check and propagate cancellation.

References

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/swift/swift-concurrency of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/implementation.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Swift Concurrency next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Swift Concurrency compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Swift Concurrency this skillHoangNguyen0403/agent-skills-standard572—~545Automated safety check: PassMIT
Stellar iOS Mac SDKSoneso/stellar-ios-mac-sdk132—~4.3kAutomated safety check: PassApache-2.0
Swift ExpertJeffallan/claude-skills12k—~1.5kAutomated safety check: PassMIT
Swift Idiomsirahardianto/awesome-agv156—~2.1kAutomated safety check: PassMIT
Core Data ExpertAvdLee/Core-Data-Agent-Skill315—~1.2kAutomated safety check: PassMIT
Swift Concurrencynimblehq/ios-templates110—~1.7kAutomated safety check: PassMIT

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Works with

Categories

Questions about Swift Concurrency

What does Swift Concurrency do?

Implement async/await, Actors, and structured concurrency in Swift. Swift Concurrency is an agent skill from HoangNguyen0403/agent-skills-standard. Implement async/await, Actors, and structured concurrency in Swift.

When should I use Swift Concurrency?

Swift Concurrency fits situations like: implementing Swift async/await; structured concurrency in iOS/macOS.

How do I install Swift Concurrency in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-concurrency -a claude-code`. Or copy the skill folder (skills/swift/swift-concurrency in HoangNguyen0403/agent-skills-standard) into .claude/skills/swift-concurrency in your project. Claude Code loads it when a task matches its description.

How do I install Swift Concurrency in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-concurrency -a codex`. Or copy the skill folder (skills/swift/swift-concurrency in HoangNguyen0403/agent-skills-standard) into .agents/skills/swift-concurrency in your project. Codex loads it when a task matches its description.

Can I use Swift Concurrency in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-concurrency -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/swift-concurrency, .gemini/skills/swift-concurrency, .github/skills/swift-concurrency and .opencode/skills/swift-concurrency in your project.

What does Swift Concurrency need to run?

SKILL.md names no scripts, command-line tools or credentials: Swift Concurrency is instructions for the agent only.

Does Swift Concurrency access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Swift Concurrency safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Swift Concurrency use?

Swift Concurrency is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Swift Concurrency use?

About 545 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 688 tokens, read only when the agent opens those files.

What are the alternatives to Swift Concurrency?

Skills that share tags, products or a category with Swift Concurrency: Stellar iOS Mac SDK (Soneso/stellar-ios-mac-sdk, 132 stars), Swift Expert (Jeffallan/claude-skills, 12k stars), Swift Idioms (irahardianto/awesome-agv, 156 stars) and Core Data Expert (AvdLee/Core-Data-Agent-Skill, 315 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swift Concurrency?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.