Research: swift-concurrency

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Research cache for catalog enrichment. Not authoritative for install or trust decisions.

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Purpose

Swift Concurrency Agent Skill: expert guidance for AI coding tools on safe concurrency, performance optimization, and Swift 6+ migration. Distilled from Swift Concurrency Course by Antoine van der Lee. Covers choosing async/await vs actors vs tasks vs groups; @MainActor/custom actors/nonisolated; Sendable conformance; isolation domains & data races prevention; actor reentrancy/retain cycles avoidance; task lifecycle/cancellation/priorities; async sequences/streams; memory (isolated deinit, weak); performance (contention, suspension, Instruments); testing (Swift Testing/XCTest, withMainSerialExecutor, @MainActor handling); Core Data integration (NSManagedObjectID, DAO, custom executors); linting/migration strategies; latest Swift 6.2 features (default actor isolation, approachable concurrency, etc). Non-opinionated, compile-time safety focus. Practical references + decision trees. MIT.

Harness Coverage

Target agents: antigravity, claude-code, codex, crush, cursor, gemini-cli, github-copilot, grok, opencode. Install via npx skills add … —skill swift-concurrency (or full URL); Claude Code /plugin marketplace + install; pi package manager; or manual clone + symlink per-tool (Codex/Claude/Cursor docs). Skill + references/ activate for matching Swift concurrency tasks/migration/debug.

Trust And Risks

Curated install-now-after-trust-gate / curated-trust-gated. MIT. 1.5k stars. Author AvdLee (Antoine van der Lee / SwiftLee blog, published concurrency course/articles, real-world large codebase Swift 6 migrations). Complements author’s other skills (swiftui-expert-skill, core-data, swift-testing). Structured SKILL.md + 15+ reference files for depth. Install options include project vs global, plugin config for teams. Risks standard for domain-specific code guidance: verify against current Swift version/tooling; generated concurrent code can have high impact on correctness/perf; review migration steps incrementally. Config notes complementarity with avdlee/swiftui. npx provenance verified.

Install Prerequisites

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┌ skills │ │ Tip: use the —yes (-y) and —global (-g) flags to install without prompts. [?25l│ ◇ Source: https://github.com/avdlee/swift-concurrency-agent-skill.git [?25h[?25l│ ◒ Cloning repository◐ Cloning repository◓ Cloning repository◑ Cloning repository◒ Cloning repository◐ Cloning repository◓ Cloning repository◑ Cloning repository◒ Cloning repository.◇ Repository cloned [?25h[?25l│ ◇ Found 1 skill [?25h│ ● Selected 1 skill: swift-concurrency │ ■ Invalid agents: grok │ ● Valid agents: aider-desk, amp, antigravity, antigravity-cli, astrbot, autohand-code, augment, bob, claude-code, openclaw, cline, codearts-agent, codebuddy, codemaker, codestudio, codex, command-code, continue, cortex, crush, cursor, deepagents, devin, dexto, droid, firebender, forgecode, gemini-cli, github-copilot, goose, hermes-agent, inference-sh, jazz, junie, iflow-cli, kilo, kimi-code-cli, kiro-cli, kode, lingma, loaf, mcpjam, mistral-vibe, moxby, mux, opencode, openhands, ona, pi, qoder, qoder-cn, qwen-code, replit, reasonix, rovodev, roo, tabnine-cli, terramind, tinycloud, trae, trae-cn, warp, windsurf, zed, zencoder, zenflow, neovate, pochi, promptscript, adal, universal

status=install-now-after-trust-gate; selector=source-spec or named. Supports Claude plugin (personal or .claude/settings.json for teams), pi, manual. Requires compatible agent with skills support. See README for verification (agent should reference triage/playbook).

Upstream Maintainer

AvdLee / Antoine van der Lee (github.com/AvdLee/Swift-Concurrency-Agent-Skill; avanderlee.com, swiftconcurrencycourse.com). MIT License. Active (releases to 2.1.1, 115+ commits). Companion skills: SwiftUI-Agent-Skill, Core-Data-Agent-Skill, Swift-Testing-Agent-Skill. Strong focus on practical Swift concurrency education and tooling.

Comparable Alternatives

Author’s swiftui-expert-skill (same maintainer); general Swift or async programming skills; official Swift docs + Swift 6 migration guides; Xcode Instruments + concurrency linting rules without agent skill; other platform concurrency experts or testing skills.

> Web-augmented research; evidence only, not authority. Authoring catalog MDX is authoritative for install metadata.