agentmods.dev

swift-concurrency

swift-concurrency is a skill for Claude Code, Codex from dagba/ios-mcp. It costs 139 tokens per session (2,524 once invoked), scanned A, a copy of swift-concurrency, MIT.

Expert guidance for Swift Concurrency, Swift's system for writing tasks that run safely at the same time using async/await, actors, and related tools.

In plain words
What is it for?
Use it to design or review async code, choose isolation boundaries, migrate to Swift 6, and refactor closure-based concurrency with appropriate verification.
Why use it?
It helps prevent data races and unsafe concurrency choices, especially when moving projects toward Swift 6.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 3repo 7mo ago A scan 139 tokens copy · 89% MIT

Good fit Use it to design or review async code, choose isolation boundaries, migrate to Swift 6, and refactor closure-based concurrency with appropriate verification.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/dagba/ios-mcp/swift-concurrency-avdlee
View source ↗ dagba/ios-mcp
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 dagba/ios-mcp --skill swift-concurrency-avdlee
Clone the repo
git clone --depth 1 https://github.com/dagba/ios-mcp

Made for: Claude Code, Codex.

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/dagba/ios-mcp/swift-concurrency-avdlee/github.svg)](https://agentmods.dev/skills/dagba/ios-mcp/swift-concurrency-avdlee)
Your own site
<a href="https://agentmods.dev/skills/dagba/ios-mcp/swift-concurrency-avdlee"><img src="https://agentmods.dev/badge/skills/dagba/ios-mcp/swift-concurrency-avdlee/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/dagba/ios-mcp/swift-concurrency-avdlee"><img src="https://agentmods.dev/badge/skills/dagba/ios-mcp/swift-concurrency-avdlee.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 139 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,524 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.
Origin 89% copy Near-identical to another mod 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 $0.00139 $0.02524
Opus 5 $0.00069 $0.01262
Sonnet 5 $0.00028 $0.00505
Haiku 4.5 $0.00014 $0.00252

Measured 12d ago against content hash dbe420e12dc7, 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 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 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.

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.

Origin

This is a copy

89% identical to swift-concurrency — 17 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/swift-concurrency-avdlee/SKILL.md · 240 lines

How it starts

The opening of the file, as written. The whole thing — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Swift Concurrency

Overview

This skill provides expert guidance on Swift Concurrency, covering modern async/await patterns, actors, tasks, Sendable conformance, and migration to Swift 6. Use this skill to help developers write safe, performant concurrent code and navigate the complexities of Swift's structured concurrency model.

Agent Behavior Contract (Follow These Rules)

  1. Analyze the project/package file to find out which Swift language mode (Swift 5.x vs Swift 6) and which Xcode/Swift toolchain is used when advice depends on it.
  2. Before proposing fixes, identify the isolation boundary: @MainActor, custom actor, actor instance isolation, or nonisolated.
  3. Do not recommend @MainActor as a blanket fix. Justify why main-actor isolation is correct for the code.
  4. Prefer structured concurrency (child tasks, task groups) over unstructured tasks. Use Task.detached only with a clear reason.
  5. If recommending @preconcurrency, @unchecked Sendable, or nonisolated(unsafe), require:
    • a documented safety invariant
    • a follow-up ticket to remove or migrate it
  6. For migration work, optimize for minimal blast radius (small, reviewable changes) and add verification steps.
  7. Course references are for deeper learning only. Use them sparingly and only when they clearly help answer the developer’s question.

Project Settings Intake (Evaluate Before Advising)

Concurrency behavior depends on build settings. Always try to determine:

  • Default actor isolation (is the module default @MainActor or nonisolated?)
  • Strict concurrency checking level (minimal/targeted/complete)
  • Whether upcoming features are enabled (especially NonisolatedNonsendingByDefault)
  • Swift language mode (Swift 5.x vs Swift 6) and SwiftPM tools version

Manual checks (no scripts)

  • SwiftPM:
    • Check Package.swift for .defaultIsolation(MainActor.self).
    • Check Package.swift for .enableUpcomingFeature("NonisolatedNonsendingByDefault").
    • Check for strict concurrency flags: .enableExperimentalFeature("StrictConcurrency=targeted") (or similar).
    • Check tools version at the top: // swift-tools-version: ...
  • Xcode projects:
    • Search project.pbxproj for:
      • SWIFT_DEFAULT_ACTOR_ISOLATION
      • SWIFT_STRICT_CONCURRENCY
      • SWIFT_UPCOMING_FEATURE_ (and/or SWIFT_ENABLE_EXPERIMENTAL_FEATURES)

Read the full file on GitHub · 240 lines

Files

What ships with it

14 files 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 · 240 lines · 139 tokens per session scan A dbe420e12dc7

Subscribe to this mod's changes

swift-concurrency is a skill published in the GitHub repository dagba/ios-mcp (3 stars, last pushed 7mo ago), licensed MIT. It adds 139 tokens to every session and 2,524 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to swift-concurrency, differing in 17 lines, and is treated as a copy.

Kotlin and SwiftLanguages
Related

Other skills, from other repositories

kotlin-specialist

Provides idiomatic Kotlin implementation patterns including coroutine concurrency, Flow stream handling, multiplatform architecture, Compose UI construction, Ktor server setup, and type-safe DSL design. Use when building Kotlin applications requiring coroutines, multiplatform development, or Android with Compose.…

Jeffallan/claude-skills · 86 tokens

swiftui-dev

Use this skill for SwiftUI development, architecture, structure, performance, and Apple native app profiling. It combines.

Orkas-AI/Orkas · 3 tokens

axiom-concurrency

Use when writing ANY async code, actors, threads, or seeing ANY concurrency error. Covers Swift 6 concurrency, @MainActor, Sendable, data races, async/await patterns.

CharlesWiltgen/Axiom · 43 tokens

wax

Swift framework guidance for Wax on-device memory/RAG. Use when writing Swift code with the public Memory facade, experimental PhotoMemory / VideoMemory, BuiltInMultimodalEmbeddings, embedding providers, retrieval modes, or hybrid search. For agent operators using the Wax MCP server tools, use the separate wax-mcp…

christopherkarani/Wax · 68 tokens

mobiai-kmp

Use when working on a Kotlin Multiplatform project — shared code, expect/actual declarations, platform-specific implementations, building and testing.

ArisGuimera/MobiAI-Core · 32 tokens

kotlin-concurrency-expert

Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code.

new-silvermoon/awesome-android-agent-skills · 44 tokens