Swift Concurrency

Swift Concurrency is a skill for Claude Code from JordanCoin/ios-skills-collection. It costs 30 tokens per session (2,321 once invoked), scanned A, original, no licence file.

Guidance for writing modern concurrent Swift code, where multiple tasks can run safely at the same time. It covers async/await, actors, TaskGroup, Sendable, and actor isolation for iOS apps.

In plain words
What is it for?
Use it to build or review async iOS code, coordinate groups of tasks, and make shared state safe across concurrent work.
Why use it?
It helps prevent data races and other threading problems while keeping asynchronous code structured. It also clarifies how Swift shares data safely between tasks.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the ios-skills plugin — 198 skills, 2 hooks shipped together

Good fit Use it to build or review async iOS code, coordinate groups of tasks, and make shared state safe across concurrent work.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency
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 JordanCoin/ios-skills-collection --skill arimunandar-swift-concurrency
Clone the repo
git clone --depth 1 https://github.com/JordanCoin/ios-skills-collection

Made for: Claude Code.

Or install ios-skills, the plugin that ships this one along with the rest of its 198 skills, 2 hooks.

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.

agentmods badge for Swift Concurrency

README.md
[![agentmods](https://agentmods.dev/badge/skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency/github.svg)](https://agentmods.dev/skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency)
Your own site
<a href="https://agentmods.dev/skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency"><img src="https://agentmods.dev/badge/skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for Swift Concurrency

Your own site · 80×15
<a href="https://agentmods.dev/skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency"><img src="https://agentmods.dev/badge/skills/jordancoin/ios-skills-collection/arimunandar-swift-concurrency.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,321 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00030 $0.02321
Opus 5 $0.00015 $0.01161
Sonnet 5 $0.00006 $0.00464
Haiku 4.5 $0.00003 $0.00232

Measured 12d ago against content hash 38dccab3dec6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

Swift Concurrency scanned grade A with 1 finding 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 12d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

user = try await repository.fetch(id: id)
skills/arimunandar--swift-concurrency/SKILL.md · 498 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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.

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.

  1. 12d ago First seen · 498 lines · 30 tokens per session scan A 38dccab3dec6

Subscribe to this mod's changes

Swift Concurrency is a skill published in the GitHub repository JordanCoin/ios-skills-collection (5 stars, last pushed 2d ago), with no licence file. It adds 30 tokens to every session and 2,321 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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