--- title: "Antoine van der Lee (@avdlee) skills · skilld" canonical_url: "https://skilld.dev/gh/avdlee" meta: description: "5 agent skills written by Antoine van der Lee on skilld. swiftui, ios, macos." "og:description": "5 agent skills written by Antoine van der Lee." "og:title": "Antoine van der Lee on skilld" --- ` ![Avatar for Antoine van der Lee](https://skilld.dev/_img/avatar?url=https%3A%2F%2Fgithub.com%2Favdlee.png) # **Antoine van der Lee** [@avdlee](https://github.com/avdlee)person Founder of SwiftLee, Indie Dev behind RocketSim 5 skills4 repos 3.6k Amsterdam, the Netherlands Synced 1 day ago Mostly·swiftui, ios, macos [GitHub](https://github.com/avdlee) [Website](https://www.avanderlee.com) ## Skills ### [avdlee/swiftui-agent-skill](https://skilld.dev/gh/avdlee/swiftui-agent-skill) Add expert SwiftUI Best Practices guidance to your AI coding tool (Agent Skills open format). 2 skills 3.6k `npx skilld add avdlee/swiftui-agent-skill` - [ **/swiftui-expert-skill**3.6k Use when writing, reviewing, or refactoring SwiftUI code for iOS or macOS, including state and \`@Observable\` data flow, view composition, resizable layouts, safe areas, display scale, performance, lists, environment, localization, animation, Liquid Glass, and API migration. Also use for iPhone Duo, foldable, or large-display layouts (\`NavigationSplitView\` on large displays, two-column reflow, foldable grids, \`ArrangementView\`, \`ReservedRegion\`), hinge effects, vertical bars, \`@State\` initialization or synthesized-property diagnostics, \`@ContentBuilder\` ambiguity, \`reorderable\` drag/drop, custom \`AsyncImage\` \`URLSession\`, swipe actions outside List, item-bound \`alert\`/\`confirmationDialog\`, \`ToolbarOverflowMenu\`, \`AnimatableValues\`, Document APIs (\`Document\`/\`DocumentReader\`), and Instruments \`.trace\` capture or analysis. /swiftui-expert-skill by avdlee](https://skilld.dev/gh/avdlee/swiftui-agent-skill/swiftui-expert-skill) - [ **/update-swiftui-apis**3.6k Scan Apple's SwiftUI documentation for deprecated APIs and update the SwiftUI Expert Skill with modern replacements. Use when asked to "update latest APIs", "refresh deprecated SwiftUI APIs", "check for new SwiftUI deprecations", "scan for API changes", or after a new iOS/Xcode release. Requires the Sosumi MCP to be available. /update-swiftui-apis by avdlee](https://skilld.dev/gh/avdlee/swiftui-agent-skill/update-swiftui-apis) ### [avdlee/swift-concurrency-agent-skill](https://skilld.dev/gh/avdlee/swift-concurrency-agent-skill) Add expert Swift Concurrency guidance to your AI coding tool (Agent Skills open format): safe concurrency, performance optimization, and Swift 6 migration. 1 skill 1.7k `npx skilld add avdlee/swift-concurrency-agent-skill` - [ **/swift-concurrency**1.7k Diagnose Swift Concurrency issues, refactor callback-based code to async/await, and guide Swift 6 migration when working with tasks, actors, @MainActor, Sendable, data races, thread safety, or concurrency-related compiler and linter warnings. /swift-concurrency by avdlee](https://skilld.dev/gh/avdlee/swift-concurrency-agent-skill) ### [avdlee/swift-testing-agent-skill](https://skilld.dev/gh/avdlee/swift-testing-agent-skill) An agent skill focused entirely on Swift Testing, helping you write better tests, migrate from XCTest, improve test architecture, and adopt modern Swift testing patterns with confidence. 1 skill 464 `npx skilld add avdlee/swift-testing-agent-skill` - [ **/swift-testing-expert**464 Expert guidance for Swift Testing: test structure, #expect/#require macros, traits and tags, parameterized tests, test plans, parallel execution, async waiting patterns, and XCTest migration. Use when writing new Swift tests, modernizing XCTest suites, debugging flaky tests, or improving test quality and maintainability in Apple-platform or Swift server projects. /swift-testing-expert by avdlee](https://skilld.dev/gh/avdlee/swift-testing-agent-skill) ### [avdlee/core-data-agent-skill](https://skilld.dev/gh/avdlee/core-data-agent-skill) An Agent Skill focused on Apple’s Core Data framework, helping with data modeling, fetch requests, performance, and common persistence patterns. 1 skill 313 `npx skilld add avdlee/core-data-agent-skill` - [ **/core-data-expert**313 Expert Core Data guidance (iOS/macOS): stack setup, fetch requests & NSFetchedResultsController, saving/merge conflicts, threading & Swift Concurrency, batch operations & persistent history, migrations, performance, and NSPersistentCloudKitContainer/CloudKit sync. /core-data-expert by avdlee](https://skilld.dev/gh/avdlee/core-data-agent-skill) Curated skills from @avdlee. Checked GitHub just now