swift-expert

Builds iOS/macOS/watchOS/tvOS applications, implements SwiftUI views and state management, designs protocol-oriented architectures, handles async/await concurrency, implements actors for thread safety, and debugs Swift-specific issues. Use when building iOS/macOS applications with Swift 5.9+, SwiftUI, or async/await concurrency. Invoke for protocol-oriented programming, SwiftUI state management, actors, server-side Swift, UIKit integration, Combine, or Vapor.

1.08x

Quality

100%

Does it follow best practices?

Impact

93%

1.08x

Average score across 6 eval scenarios

Securityby

Passed

No known issues

Evaluation results

100%

Flight Price Monitor

Async/await and actor concurrency

Criteria

Without context

With context

async/await used

100%

Actor for shared state

100%

@MainActor annotation

100%

Sendable conformance

100%

Structured concurrency

100%

No Task.detached overuse

100%

Cancellation check

50%

100%

No improper sync/async mixing

100%

Error propagation

62%

100%

No force unwrap

100%

Value types for data

100%

98%

Recipe Discovery App

Protocol-oriented SwiftUI architecture

Criteria

Without context

With context

Protocol-first service

100%

Struct for models

100%

Correct @State usage

100%

@StateObject for owned VM

100%

80%

.task modifier used

100%

No Objective-C patterns

100%

Protocol dependency injection

100%

API markup comments

100%

No force unwrap

100%

No hardcoded platform values

100%

Architectural explanation

100%

86%

14%

Location-Aware Notification System

Memory safety and async testing

Criteria

Without context

With context

Capture list in closures

100%

50%

Weak delegate reference

100%

No force unwrap

50%

100%

No implicitly unwrapped optionals

100%

Error handling present

100%

Async XCTest methods

50%

100%

@testable import

Protocol-based mock

100%

Given-When-Then structure

62%

100%

setUp/tearDown used

100%

Value types for data

100%

92%

Habit Tracker – Daily Goals Feature

@Observable and modern SwiftUI state

Criteria

Without context

With context

@Observable macro used

100%

No ObservableObject/Published

100%

@State for @Observable VM

100%

Custom ViewModifier defined

100%

@Environment used over prop drilling

100%

Property wrapper defined

Protocol definitions present

100%

Model types as struct

100%

API markup comments

100%

No Objective-C patterns

100%

Architectural explanation

100%

98%

10%

Concurrent Price Feed Aggregator – Swift Package

Build workflow validation and Sendable compliance

Criteria

Without context

With context

swift build step scripted

100%

swift build -warnings-as-errors scripted

100%

swift test scripted

100%

Sendable conformance on boundary types

100%

83%

Structured concurrency for parallel ops

100%

withCheckedThrowingContinuation for legacy bridge

100%

No force unwrap

100%

Error handling

100%

Value types for models

100%

No actor isolation ignored

100%

86%

Photo Library Batch Processor

Memory management and performance patterns

Criteria

Without context

With context

lazy property used

66%

100%

autoreleasepool in loop

100%

Memory warning handler

50%

60%

reserveCapacity called

100%

Profile-before-optimize rationale

100%

Appropriate collection type

100%

Value types for models

100%

Weak reference for delegate

100%

Capture list in closures

100%

No blocking in async context

100%

API markup comments

100%

Repository: jeffallan/claude-skills
Commit: 5b76101

Evaluated: 27 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Flight Price Monitor Recipe Discovery App Location-Aware Notification System Habit Tracker – Daily Goals Feature Concurrent Price Feed Aggregator – Swift Package Photo Library Batch Processor

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