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swift

Skill file skills/swift/SKILL.md in rshankras/claude-code-apple-skills. Read the publisher’s upstream source.

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swift-development

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Use swift-development to review [Swift files or module] for [concurrency, performance, or architecture] issues and provide targeted modern Swift recommendations.

Required inputs

  • [Swift files or module]
  • [concurrency, performance, or architecture]

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SKILL.md

name: swift-developmentdescription: Swift language patterns and best practices including concurrency, performance, and modern idioms. Use for Swift language-level code review or architecture guidance.allowed-tools: [Read, Glob, Grep]last_verified: 2026-07-16review_by: 2027-06-22os_version: iOS 27 / macOS 27

Swift Development

Swift language-level guidance that applies across all Apple platforms.

When This Skill Activates

Use this skill when the user:

  • Asks about Swift concurrency (async/await, actors, Sendable, TaskGroup)
  • Needs help with Swift 6 strict concurrency migration
  • Has data race or actor isolation errors
  • Asks about InlineArray, Span, or low-level memory performance
  • Wants to eliminate heap allocations or replace unsafe pointers
  • Asks about modern Swift patterns independent of any specific platform
  • Wants complexity/size limits (SwiftLint thresholds) on agent-written code

Available Modules

concurrency-patterns/

Swift concurrency architecture and patterns.

  • Swift 6.2 approachable concurrency features (incl. nonisolated(nonsending), Apple's adoption doctrine)
  • Structured concurrency (async let, TaskGroup, .task modifier, task-local values)
  • Actors, isolation, reentrancy, @MainActor, Sendable
  • Runtime internals + profiling (cooperative pool, unsafe primitives, Swift Concurrency Instrument)
  • Continuations for bridging legacy APIs
  • Swift 6 strict concurrency migration guide

concurrency/

Swift 6.2 concurrency updates reference — the what-changed view (async-stays-on-caller, default MainActor inference, isolated conformances, @concurrent) with migration steps from 6.0/6.1 and top mistakes. Overlaps concurrency-patterns/swift62-concurrency.md by design: use this file when the question is "what changed in 6.2?", use concurrency-patterns when building or reviewing async code.

code-size/

Complexity and size limits for Swift code — SwiftLint threshold rules (cyclomatic complexity, function/type/file length, parameter count) with a violations-baseline adoption path so existing code never blocks. Part of the deterministic gauntlet with testing/fitness-functions and testing/coverage-ratchet.

memory/

InlineArray, Span, and the Swift performance cost model.

  • InlineArray: fixed-size, stack-allocated collections with zero heap overhead
  • Span family: safe, non-escapable access to contiguous memory (+ OutputRawSpan, swift-binary-parsing)
  • Lifetime dependencies and non-escapable type constraints
  • swift-performance.md: the cost model — allocation, ARC/retain-release, exclusivity checks, dispatch, generics vs existentials, closures, ~Copyable ownership

How to Use

  1. Identify user's need from their question
  2. Read relevant module files from subdirectories
  3. Apply the guidance to their specific context
  4. Cross-reference with platform-specific skills (ios/, macos/) as needed