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.
72
88%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Passed
No known issues
Quality
Discovery
100%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is an excellent skill description that clearly articulates specific capabilities across the Apple development ecosystem, provides explicit 'Use when' and 'Invoke for' trigger clauses with comprehensive natural keywords, and occupies a distinct niche. The description is well-structured, uses third person voice throughout, and balances breadth of coverage with specificity.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: 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. | 3 / 3 |
Completeness | Clearly answers both 'what' (builds apps, implements SwiftUI views, designs architectures, handles concurrency, debugs issues) and 'when' with explicit trigger guidance ('Use when building iOS/macOS applications...', 'Invoke for protocol-oriented programming, SwiftUI state management...'). | 3 / 3 |
Trigger Term Quality | Excellent coverage of natural terms users would say: iOS, macOS, SwiftUI, Swift 5.9+, async/await, protocol-oriented programming, actors, UIKit, Combine, Vapor, server-side Swift, watchOS, tvOS. These are all terms developers would naturally use when requesting help. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with a clear niche in Swift/Apple platform development. The specific mention of Swift 5.9+, SwiftUI, actors, Combine, Vapor, and UIKit creates a well-defined boundary that is unlikely to conflict with general programming or web development skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
77%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a solid, well-structured Swift skill with excellent actionability through concrete, executable code examples covering key Swift patterns. The workflow includes explicit validation checkpoints with specific commands. The main weaknesses are moderate verbosity (some constraints Claude already knows, lengthy DON'T examples) and referenced files that don't exist in the bundle, undermining the progressive disclosure strategy.
Suggestions
Trim the constraints section to only non-obvious, Swift-specific rules — remove items like 'skip error handling' and 'create retain cycles' that Claude already knows to avoid.
Provide the referenced files (e.g., `references/swiftui-patterns.md`) in the bundle, or remove the reference table if they won't be created, since broken references reduce trust in the skill.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is reasonably efficient but includes some unnecessary content. The 'DON'T' examples, while useful, add significant length. The constraints section lists items Claude already knows (e.g., 'skip error handling', 'create retain cycles'). Some tightening is possible, but overall it's not egregiously verbose. | 2 / 3 |
Actionability | The skill provides fully executable, copy-paste-ready Swift code examples for async/await, SwiftUI state management, protocol-oriented design, and actors. Each pattern includes both correct and incorrect approaches with concrete, compilable code. | 3 / 3 |
Workflow Clarity | The core workflow is clearly sequenced with five numbered steps and an explicit validation checkpoint block specifying exact commands (`swift build`, `swift build -warnings-as-errors`, `swift test`) and when to run them. The feedback loop is implicit but the checkpoints are well-placed after implementation, optimization, and testing steps. | 3 / 3 |
Progressive Disclosure | The reference table with 'Load When' guidance is well-structured and clearly signals when to consult each reference file. However, no bundle files are provided, meaning all five referenced files (e.g., `references/swiftui-patterns.md`) don't actually exist, which undermines the progressive disclosure structure. The inline content is also fairly lengthy for an overview document. | 2 / 3 |
Total | 10 / 12 Passed |
Validation
90%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 10 / 11 Passed
Validation for skill structure
| Criteria | Description | Result |
|---|---|---|
metadata_field | 'metadata' should map string keys to string values | Warning |
Total | 10 / 11 Passed | |
- Repository
- jeffallan/claude-skills
- Commit
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