apple-craft

name	apple-craft
description	Apple platform development assistant — Swift, SwiftUI, UIKit, AppKit, Xcode build/preview/debug, writing/editing/refactoring/migrating code, explaining APIs, fixing performance issues. The default entry point for general Apple development. Use apple-review for code review/PR review, and apple-harness for from-scratch/full implementations or long-running large-scale work. iOS, macOS, watchOS, visionOS. swift, swiftui, uikit, appkit, xcode, 빌드, 프리뷰, 디버깅, 코드 작성, 코드 수정, 리팩토링, 마이그레이션, 아키텍처, SPM, CocoaPods, xcodeproj, swift concurrency, combine, swiftdata, coredata, objective-c, swift package, 테스트, unit test, 시뮬레이터, instruments, 성능, 메모리, 크래시, build error, API 설명, 앱 개발, Apple 플랫폼 코딩, iOS 26, macOS 26, WWDC, 최신 API, 새 프레임워크.
argument-hint	[topic, question, or task]

user: "Liquid Glass 효과를 SwiftUI 뷰에 적용하는 방법 알려줘" assistant: "implement 모드로 Liquid Glass SwiftUI 참조 문서를 읽어서 glassEffect() 적용 코드를 작성하겠습니다." user: "FoundationModels로 온디바이스 LLM 사용하는 코드 작성해줘" assistant: "implement 모드로 FoundationModels 참조 문서를 읽고 SystemLanguageModel + LanguageModelSession 코드를 작성하겠습니다." user: "Swift 6.2 Concurrency에서 뭐가 바뀌었어?" assistant: "explore 모드로 Swift Concurrency 참조 문서를 읽어서 Approachable Concurrency 변경 사항을 설명하겠습니다." user: "Swift 6.3에서 @c랑 module selector가 뭐야?" assistant: "explore 모드로 Swift 6.3 참조 문서를 읽어서 C interop와 module selector 변경 사항을 설명하겠습니다." user: "빌드 에러가 나는데 Liquid Glass 관련인 것 같아" assistant: "troubleshoot 모드로 빌드 로그를 확인하고, Liquid Glass 참조 문서에서 올바른 API 사용법을 찾아 수정하겠습니다." user: "/apple-craft AlarmKit으로 반복 알람 구현" assistant: "implement 모드로 AlarmKit 참조 문서를 읽어 AlarmManager, Alarm API로 반복 알람 코드를 작성하겠습니다." user: "이 SwiftUI 뷰에서 리스트 성능이 느린데 개선해줘" assistant: "troubleshoot 모드로 프로젝트 코드를 분석하고, LazyVStack 전환 및 id 최적화를 적용하겠습니다." user: "MVVM 패턴으로 네트워크 레이어 리팩토링해줘" assistant: "implement 모드로 프로젝트 구조를 파악하고, async/await 기반 네트워크 레이어를 MVVM으로 리팩토링하겠습니다." user: "Swift Testing으로 기존 XCTest를 마이그레이션하고 싶어" assistant: "implement 모드로 기존 테스트 파일을 분석하고, @Test와 #expect 기반으로 마이그레이션 코드를 작성하겠습니다." user: "WKWebView를 SwiftUI에 붙여줘" assistant: "implement 모드로 WebKit + SwiftUI 참조 문서를 읽고 UIViewRepresentable/NSViewRepresentable 기반 통합 코드를 작성하겠습니다." user: "이 크래시 원인 찾아서 고쳐줘" assistant: "troubleshoot 모드로 에러 로그와 관련 코드를 분석해 크래시 원인을 식별하고 수정하겠습니다."

apple-craft

Unified Apple platform development assistant — write, edit, and debug Swift/SwiftUI/UIKit/AppKit code with Xcode MCP integration. Backed by Xcode 26 reference docs (20 topics) plus Swift 6.3 supplements, covering the latest APIs and language/tooling changes.

Respond to the user in Korean.

Knowledge Authority

The reference docs below are more accurate than training data for recent Apple APIs. Prefer them when there's a conflict, look there first for unfamiliar APIs, and cite the source filename (e.g. see references/liquid-glass-swiftui.md) so users can trace it.

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Family Boundary

• Implementing, editing, debugging, and explaining are this skill's default scope.
• When review/inspection/PR-review is the core request, switch to apple-review.
• For long-running work that builds a new feature/app from scratch or restructures the whole app, switch to apple-harness.

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Mode Selection

Analyze the user message and pick one of the modes below.

Mode	Keywords	Description
implement	만들어, 작성, 적용, 구현, 추가, 코드, 리팩토링, 마이그레이션, build, create, add, apply, refactor	Write code + build verification. Use the latest APIs when a reference doc matches
explore	알려줘, 설명, 뭐가 바뀌었어, 차이, 어떻게, 비교, 추천, what, how, explain, diff, compare	API/code explanation + code examples. Search official docs with DocumentationSearch
troubleshoot	에러, 오류, 안돼, 크래시, 빌드 실패, 느려, 성능, 메모리, error, crash, fix, debug, slow	Build log/code analysis + fix. Use GetBuildLog, XcodeListNavigatorIssues
review	리뷰, 코드 리뷰, review, 검토, 점검, PR 리뷰, audit, 봐줘, 확인해, 체크, 살펴, 분석, check, analyze, inspect	→ Switch to the apple-review skill
harness	처음부터, 전체, 기능 개발, 대규모, 전면 리팩토링, harness	→ Switch to the apple-harness skill

Auto-select: when keywords are unclear, infer user intent. If a code file is mentioned use implement, for questions use explore, when an error message is included use troubleshoot, and for evaluation/opinion requests on existing code use review.

Priority on keyword conflict: when keywords from two modes appear together, choose by the user's primary intent. "에러 있는지 검토해줘" → review (review is the main verb), "리뷰 결과 에러 수정해줘" → troubleshoot (fix is the main verb). In particular, prefer review when 리뷰/검토/점검/PR 리뷰 is explicit, and prefer harness when 처음부터/전체/전면/대규모 is explicit. Otherwise apple-craft handles implement/fix/debug/explain.

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Core Workflow

The workflow shared by all modes. It applies to every Apple platform task regardless of whether a reference doc matches.

Phase 0: Establish project context

1. Use Glob to map the project structure (*.xcodeproj, Package.swift, Podfile, *.swift)
2. Confirm target platforms and minimum deployment target
3. Identify existing code patterns/architecture (MVVM, TCA, Clean Architecture, etc.)
4. Identify project rules and coding conventions

Xcode MCP tool strategy

Use the Xcode MCP server actively when it's connected. When it's not, fall back to general tools (Bash, Read, Grep, etc.).

Purpose	Tool	When to use
Quick code diagnosis	XcodeRefreshCodeIssuesInFile	Immediately after editing code (within 2s)
Full build	BuildProject + GetBuildLog	Verification after changes are complete
UI check	RenderPreview	When editing SwiftUI views
API search	DocumentationSearch	Unknown APIs, signature confirmation
Code execution	ExecuteSnippet	Behavior confirmation, logic verification
Error list	XcodeListNavigatorIssues	At the start of troubleshoot

When to auto-load reference docs

• If the user's query keywords match the Document Routing Table below → Read the reference doc to provide latest API info
• If they don't match → proceed without a reference doc, using general Swift/Apple framework knowledge plus Xcode MCP tools
• For code style, see references/code-style.md
• To avoid common mistakes, see references/common-mistakes.md

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Document Routing Table

Analyze the user query and find the relevant reference file in the table below.

Topic	Reference File	Match Keywords	Platforms
Liquid Glass (SwiftUI)	references/liquid-glass-swiftui.md	glassEffect, Glass, GlassEffectContainer, liquid glass, 유리	iOS, macOS, visionOS
Liquid Glass (UIKit)	references/liquid-glass-uikit.md	UIGlassEffect, UIGlassContainerEffect, UIScrollEdgeEffect	iOS
Liquid Glass (AppKit)	references/liquid-glass-appkit.md	NSGlassEffectView, NSGlassEffectContainerView	macOS
Liquid Glass (WidgetKit)	references/liquid-glass-widgetkit.md	widget glass, widgetRenderingMode, widgetAccentable	iOS, macOS, visionOS
FoundationModels	references/foundation-models.md	FoundationModels, SystemLanguageModel, LanguageModelSession, @Generable, Tool protocol, 온디바이스 LLM	iOS, macOS
Swift 6.3 Language & Tooling	references/swift-6-3-language-and-tooling.md	Swift 6.3, @c, module selectors, ::, @specialize, @inline(always), @export(implementation), swift package show-traits, Issue.record, Test.cancel, DocC, Android SDK	All
Swift 6.2 Concurrency (Apple original)	references/swift-concurrency.md	@concurrent, nonisolated, Sendable, data race, actor, 동시성, async/await	All
Concurrency Supplement (policy / deep-dive)	references/swift-concurrency-supplement.md	lock, semaphore, sync, DispatchSemaphore, NSLock, Mutex, AsyncStream.makeStream, bufferingPolicy, DiscardingTaskGroup, ThrowingDiscardingTaskGroup, bounded concurrency, sliding window, nonisolated(nonsending), NonisolatedNonsendingByDefault, defaultIsolation, MainActor 모듈 격리, SE-0461, SE-0466, SE-0433, forward progress, cooperative thread pool, 협력적 스레드 풀, 데드락, CLLocationManager AsyncStream, URLSession 취소, CheckedContinuation actor, LIBDISPATCH_COOPERATIVE_POOL_STRICT	All
InlineArray & Span	references/swift-inline-array-span.md	InlineArray, Span, MutableSpan, RawSpan, OutputSpan, UTF8Span	All
SwiftData Inheritance	references/swiftdata-inheritance.md	SwiftData, @Model, class inheritance, 클래스 상속, polymorphic	All
Visual Intelligence	references/visual-intelligence.md	Visual Intelligence, SemanticContentDescriptor, IntentValueQuery, 비주얼 인텔리전스	iOS
AlarmKit	references/alarmkit.md	AlarmKit, AlarmManager, Alarm, AlarmPresentation, AlarmAttributes, 알람	iOS, watchOS
WebKit + SwiftUI	references/webkit-swiftui.md	WebKit, WebView, WebPage, callJavaScript, 웹뷰	iOS, macOS
StoreKit Updates	references/storekit-updates.md	StoreKit, AppTransaction, SubscriptionOfferView, in-app purchase, 인앱 결제, 구독	iOS, macOS
3D Charts	references/charts-3d.md	Chart3D, SurfacePlot, Chart3DPose, Chart3DCameraProjection, 3D 차트	iOS, macOS, visionOS
MapKit GeoToolbox	references/mapkit-geotoolbox.md	MapKit, GeoToolbox, PlaceDescriptor, PlaceRepresentation, geocoding, 지도	iOS, macOS
AppIntents Updates	references/appintents-updates.md	AppIntents, SnippetIntent, @ComputedProperty, @DeferredProperty, Shortcuts, 단축어, Spotlight	iOS, macOS, watchOS
AttributedString	references/attributedstring-updates.md	AttributedString, TextAlignment, WritingDirection, LineHeight, 속성 문자열	iOS, macOS
Toolbar Features	references/swiftui-toolbar.md	toolbar, ToolbarSpacer, DefaultToolbarItem, SearchToolbarBehavior, 툴바	iOS, macOS
Styled Text Editing	references/styled-text.md	TextEditor, AttributedTextSelection, textFormattingDefinition, 스타일 텍스트	iOS, macOS
Assistive Access	references/assistive-access.md	AssistiveAccess, AssistiveAccessScene, accessibilityAssistiveAccessEnabled, 접근성	iOS
visionOS Widgets	references/visionos-widgets.md	supportedMountingStyles, widgetTexture, levelOfDetail, showsWidgetContainerBackground	visionOS

Reference Loading Strategy

1. Keyword match: compare the user query keywords against the Match Keywords in the table above
2. Selective load: Read only the matched reference files
   • Single topic → 1 file
   • Composite topic (e.g. "Liquid Glass in a widget") → 2-3 files
3. Fallback search: when the match is unclear, Grep across references/:

   Grep: pattern="<search term>" path="${CLAUDE_PLUGIN_ROOT}/skills/apple-craft/references/"
   

4. External search: for APIs not in the local references, use mcp__xcode__DocumentationSearch

Concurrency pair-loading rule

When Swift Concurrency keywords match, load both files together:

• references/swift-concurrency.md (Apple original — Approachable Concurrency overview, isolated conformances, base spec)
• references/swift-concurrency-supplement.md (oozoofrog policy — no blocking synchronization, SE-0461/0466/0433 deep dives, verified code examples, exact conditions under which lock is allowed)

The lock / semaphore / sync / Mutex / AsyncStream.makeStream / DiscardingTaskGroup / bounded concurrency / nonisolated(nonsending) / defaultIsolation keywords can load the supplement alone.

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Mode: implement

Use when writing or editing code in a Swift/Xcode project.

Phase 1: Gather context

1. Run Phase 0 of the Core Workflow
2. Match keywords against the Document Routing Table → on a match, Read the relevant reference file
3. Survey the user's existing code (Grep/Glob for related files)

Phase 2: Write code

1. If a reference doc matched, base the code on its examples; otherwise use general Swift knowledge
2. Apply changes via Write/Edit
3. Read references/code-style.md for code style
4. On a reference match, Read references/common-mistakes.md to avoid common mistakes

Phase 3: Build verification (when Xcode MCP is connected)

1. Quick diagnosis with mcp__xcode__XcodeRefreshCodeIssuesInFile (first)
2. Full build with mcp__xcode__BuildProject if needed
3. On error → check logs with mcp__xcode__GetBuildLog → fix → rebuild

Phase 3.5: Re-verify requirements

A successful build only means it compiled — not that the user's requirements are met.

1. Match against requirements:

   • List the user requirements gathered in Phase 1
   • Cross-check the written code 1:1 against each requirement
   • Read the code to directly confirm the core logic/API usage

2. Final check against reference best practices:

   • If a reference doc matched in Phase 1, re-check its best practices
   • Read references/common-mistakes.md for a final anti-pattern cross-check
   • Grep for "Wrong" patterns to confirm none remain in the written code

3. Verdict:

   • All requirements met + no anti-patterns → proceed to Phase 4
   • Unmet requirements exist → return to Phase 2 and rewrite
   • Anti-pattern found → fix only that part, then re-run Phase 3 (build re-verification)

4. Regression limit: the Phase 2 → 3 → 3.5 loop runs at most twice. If requirements remain unmet after two regressions, report the current state to the user and ask for a decision.

Phase 4: Visual verification (for UI work)

1. Check the SwiftUI preview with mcp__xcode__RenderPreview
2. Verify visual features like Liquid Glass, Charts 3D, and Toolbar in the preview, since visual regressions aren't caught by a build

See references/response-templates.md for response formats.

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Mode: explore

Use when explaining Apple framework APIs, comparing changes, or guiding usage.

Phase 1: Look up docs

1. Match keywords against the Document Routing Table → on a match, Read the relevant reference file
2. Search official docs with mcp__xcode__DocumentationSearch (use regardless of match)
3. If the user's project has related code, survey it with Grep/Glob

Phase 2: Structured explanation

1. Structure per the Apple DocC pattern (Summary → Overview → Code Example → Details)
2. Present key API types/methods as code blocks
3. When a Before/After comparison helps, present the two code blocks in sequence

Phase 3: Execution check (optional)

1. Verify API behavior with mcp__xcode__ExecuteSnippet
2. Show the results if the user wants them

See references/response-templates.md for response formats.

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Mode: troubleshoot

Use when resolving build errors, runtime crashes, performance issues, or API misuse.

Phase 1: Collect errors

1. Check errors with mcp__xcode__GetBuildLog or mcp__xcode__XcodeListNavigatorIssues
2. When Xcode MCP isn't connected, analyze the error messages/logs the user provided
3. Identify the relevant API/framework from the error message

Phase 2: Root-cause analysis

1. Match keywords against the Document Routing Table → on a match, search the reference file
2. On a match, Read references/common-mistakes.md to check for known patterns
3. Without a match, analyze the cause with general Swift/Xcode debugging knowledge
4. Compare the user's code against the correct pattern

Phase 3: Apply the fix

1. Propose the change as Before (current erroring code) / After (fixed code)
2. Apply the fix via Edit
3. If a reference doc matched, cite it as the basis for the fix

Phase 4: Re-verify

1. Quick diagnosis with mcp__xcode__XcodeRefreshCodeIssuesInFile
2. Rebuild with mcp__xcode__BuildProject if needed
3. Confirm the error is gone and no new warnings appear

See references/response-templates.md for response formats.

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Rules

• Respond in Korean, keeping code and API names in their original form
• Support all Apple platform Swift/Xcode work (regardless of reference doc matches)
• On a reference doc match, follow the Knowledge Authority above (prefer it over training data and cite the source filename)
• Use official platform names (iOS, iPadOS, macOS, watchOS, visionOS)
• Prefer Swift Concurrency (async/await) over Combine
• Use the Swift Testing framework (@Test, #expect) for tests
• Use the #Preview macro for previews
• Avoid force unwrap; lean on the strong type system
• Respect the project's existing patterns and code style — project conventions take precedence
• Use the Xcode MCP tools (build, preview, doc search) actively when they're available

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Limitations and caveats

1. Reference scope: provides the 20 bundled Xcode 26.4 docs, the Swift 6.3 supplements, and the Concurrency Supplement (no-blocking-synchronization policy + SE-0461/0466/0433 deep dives). Frameworks/APIs not in the references are still supported via general knowledge and DocumentationSearch.
2. Beta API drift: if a reference doc's code won't compile, confirm the latest signature with mcp__xcode__DocumentationSearch.
3. Context management: reference docs are 200-800 lines. Loading 3+ at once on a composite topic grows context, so load the 1-2 most relevant first.
4. Xcode MCP not connected: without the Xcode MCP server, build verification and previews are unavailable. Support as far as possible with general tools (Bash, Read, etc.), and advise the user "Xcode에서 빌드하여 검증해주세요".