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Agent skill

Swift Concurrency Expert

by davila7 in davila7/claude-code-templates

Review and fix Swift concurrency issues such as actor isolation and Sendable violations.

MITAuto-check passedMobile

Install Swift Concurrency Expert

skills CLI
$ npx skills add davila7/claude-code-templates --skill swift-concurrency-expert -a claude-code

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

GitHub CLI
$ gh skill install davila7/claude-code-templates swift-concurrency-expert --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/davila7/claude-code-templates.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cli-tool/components/skills/development/swift-concurrency-expert .claude/skills/swift-concurrency-expert && 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-expert
GitHub stars
33k
Used in
3 other repos
Token cost
~1.1k tokens
SKILL.md length
323 words
Files
5 (incl. references)
Skills in repo
479
Repo updated
First seen
Licence
MIT

At a glance

Review and fix Swift concurrency issues such as actor isolation and Sendable violations.

  • Works in 3 steps: Triage the issue → Apply the smallest safe fix → Verify the fix
  • Mobile work in your project
  • SKILL.md covers Overview, When to Use, Workflow and Reference material
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Swift Concurrency Expert is an agent skill from davila7/claude-code-templates. Review and fix Swift concurrency issues such as actor isolation and Sendable violations.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `agents/openai.yaml`, `references/approachable-concurrency.md` and `references/swift-6-2-concurrency.md`).

It sits in Mobile. It works with Swift. The repository describes itself as: CLI tool for configuring and monitoring Claude Code. The licence is MIT.

When your agent uses it

  • Mobile work in your project

Example prompts

  • “/swift-concurrency-expert”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Triage the issue
  2. Apply the smallest safe fix
  3. Verify the fix

What it can do on your machine

Read from SKILL.md and the folder at commit 79182c5. 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 (its code samples are swift).

    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 Expert loads about 1.1k tokens when it runs, and up to ~4.8k if it reads all its reference files. Until then it costs about 28 tokens; SKILL.md has 323 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~28
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.8k

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 davila7/claude-code-templates at commit 79182c5, republished under its MIT licence (© davila7). 323 words, ~1,072 tokens.

Download SKILL.mdSave it as .claude/skills/swift-concurrency-expert/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
swift-concurrency-expert
description
Review and fix Swift concurrency issues such as actor isolation and Sendable violations.
risk
safe
source
Dimillian/Skills (MIT)
date_added
2026-03-25

Swift Concurrency Expert

Overview

Review and fix Swift Concurrency issues in Swift 6.2+ codebases by applying actor isolation, Sendable safety, and modern concurrency patterns with minimal behavior changes.

When to Use

  • When the user asks to review Swift concurrency usage or fix compiler diagnostics.
  • When you need guidance on actor isolation, Sendable, @MainActor, or async migration.

Workflow

1. Triage the issue
  • Capture the exact compiler diagnostics and the offending symbol(s).
  • Check project concurrency settings: Swift language version (6.2+), strict concurrency level, and whether approachable concurrency (default actor isolation / main-actor-by-default) is enabled.
  • Identify the current actor context (@MainActor, actor, nonisolated) and whether a default actor isolation mode is enabled.
  • Confirm whether the code is UI-bound or intended to run off the main actor.
2. Apply the smallest safe fix

Prefer edits that preserve existing behavior while satisfying data-race safety.

Common fixes:

  • UI-bound types: annotate the type or relevant members with @MainActor.
  • Protocol conformance on main actor types: make the conformance isolated (e.g., extension Foo: @MainActor SomeProtocol).
  • Global/static state: protect with @MainActor or move into an actor.
  • Background work: move expensive work into a @concurrent async function on a nonisolated type or use an actor to guard mutable state.
  • Sendable errors: prefer immutable/value types; add Sendable conformance only when correct; avoid @unchecked Sendable unless you can prove thread safety.
3. Verify the fix
  • Rebuild and confirm all concurrency diagnostics are resolved with no new warnings introduced.
  • Run the test suite to check for regressions — concurrency changes can introduce subtle runtime issues even when the build is clean.
  • If the fix surfaces new warnings, treat each one as a fresh triage (return to step 1) and resolve iteratively until the build is clean and tests pass.
Examples

UI-bound type — adding @MainActor

swift
// Before: data-race warning because ViewModel is accessed from the main thread
// but has no actor isolation
class ViewModel: ObservableObject {
    @Published var title: String = ""
    func load() { title = "Loaded" }
}

// After: annotate the whole type so all stored state and methods are
// automatically isolated to the main actor
@MainActor
class ViewModel: ObservableObject {
    @Published var title: String = ""
    func load() { title = "Loaded" }
}

Protocol conformance isolation

swift
// Before: compiler error — SomeProtocol method is nonisolated but the
// conforming type is @MainActor
@MainActor
class Foo: SomeProtocol {
    func protocolMethod() { /* accesses main-actor state */ }
}

// After: scope the conformance to @MainActor so the requirement is
// satisfied inside the correct isolation context
@MainActor
extension Foo: SomeProtocol {
    func protocolMethod() { /* safely accesses main-actor state */ }
}

Background work with @concurrent

swift
// Before: expensive computation blocks the main actor
@MainActor
func processData(_ input: [Int]) -> [Int] {
    input.map { heavyTransform($0) }   // runs on main thread
}

// After: hop off the main actor for the heavy work, then return the result
// The caller awaits the result and stays on its own actor
nonisolated func processData(_ input: [Int]) async -> [Int] {
    await Task.detached(priority: .userInitiated) {
        input.map { heavyTransform($0) }
    }.value
}

// Or, using a @concurrent async function (Swift 6.2+):
@concurrent
func processData(_ input: [Int]) async -> [Int] {
    input.map { heavyTransform($0) }
}

Reference material

  • See references/swift-6-2-concurrency.md for Swift 6.2 changes, patterns, and examples.
  • See references/approachable-concurrency.md when the project is opted into approachable concurrency mode.
  • See references/swiftui-concurrency-tour-wwdc.md for SwiftUI-specific concurrency guidance.

© davila7, 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 4 other files (references) in cli-tool/components/skills/development/swift-concurrency-expert of davila7/claude-code-templates.

  • SKILL.md
  • agents/openai.yaml
  • references/approachable-concurrency.md
  • references/swift-6-2-concurrency.md
  • references/swiftui-concurrency-tour-wwdc.md

Open the folder on GitHubat commit 79182c5

Used in 3 other repositories

We found 12 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in davila7/claude-code-templates, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Swift Concurrency Expert 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 Expert compared with similar skills
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Swift Concurrency Expert this skilldavila7/claude-code-templates33k3 repos~1.1kAutomated safety check: PassMIT
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Swift Concurrencydpearson2699/swift-ios-skills1.2k—~5kAutomated safety check: PassCustom licence
Swift Concurrency 6 2affaan-m/ECC276k—~1.5kAutomated safety check: PassMIT
Memorygustavscirulis/snapgrid1161 repos~3kAutomated safety check: PassCustom licence
Swift Concurrency 6 2xu-xiang/everything-claude-code-zh2k—~1.4kAutomated safety check: PassMIT

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Works with

Categories

Questions about Swift Concurrency Expert

What does Swift Concurrency Expert do?

Review and fix Swift concurrency issues such as actor isolation and Sendable violations. Swift Concurrency Expert is an agent skill from davila7/claude-code-templates. Review and fix Swift concurrency issues such as actor isolation and Sendable violations.

When should I use Swift Concurrency Expert?

Swift Concurrency Expert fits situations like: mobile work in your project.

How do I install Swift Concurrency Expert in Claude Code?

Run `npx skills add davila7/claude-code-templates --skill swift-concurrency-expert -a claude-code`. Or copy the skill folder (cli-tool/components/skills/development/swift-concurrency-expert in davila7/claude-code-templates) into .claude/skills/swift-concurrency-expert in your project. Claude Code loads it when a task matches its description.

How do I install Swift Concurrency Expert in Codex?

Run `npx skills add davila7/claude-code-templates --skill swift-concurrency-expert -a codex`. Or copy the skill folder (cli-tool/components/skills/development/swift-concurrency-expert in davila7/claude-code-templates) into .agents/skills/swift-concurrency-expert in your project. Codex loads it when a task matches its description.

Can I use Swift Concurrency Expert 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 davila7/claude-code-templates --skill swift-concurrency-expert -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-expert, .gemini/skills/swift-concurrency-expert, .github/skills/swift-concurrency-expert and .opencode/skills/swift-concurrency-expert in your project.

What does Swift Concurrency Expert need to run?

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

Does Swift Concurrency Expert 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 Expert 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 Expert use?

Swift Concurrency Expert 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 Expert use?

About 1.1k tokens (SKILL.md is roughly 4.3k 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 3.7k tokens, read only when the agent opens those files.

What are the alternatives to Swift Concurrency Expert?

Skills that share tags, products or a category with Swift Concurrency Expert: Swift Concurrency Expert (harperreed/dotfiles, 334 stars), Swift Concurrency (dpearson2699/swift-ios-skills, 1.2k stars), Swift Concurrency 6 2 (affaan-m/ECC, 276k stars) and Memory (gustavscirulis/snapgrid, 116 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swift Concurrency Expert?

davila7 (a GitHub user) maintains it in davila7/claude-code-templates, which has 32,552 GitHub stars. The repository holds 479 skills in this directory. The repository was last updated on October 11, 2026.

Source: davila7/claude-code-templates on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.