fusengine/solid-swift
plugins/swift-apple-expert/skills/solid-swift/SKILL.md
SOLID principles for Swift 6 and SwiftUI (iOS 26+). Files < 100 lines, protocols separated, @Observable, actors, Preview-driven development. Features Modular MANDATORY.
$ install --global
skillsauthnpx skillsauth add fusengine/agents solid-swiftInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Jul 17, 2026, 2:42 AM65.1s14 files scanned
SKILL.md
- name:
- solid-swift
- description:
- SOLID principles for Swift 6 and SwiftUI (iOS 26+). Files < 100 lines, protocols separated, @Observable, actors, Preview-driven development. Features Modular MANDATORY.
- swift:
- 6.2
- ios:
- 26
- user-invocable:
- true
- references:
- references/solid-principles.md, references/single-responsibility.md, references/open-closed.md, references/liskov-substitution.md, references/interface-segregation.md, references/dependency-inversion.md, references/concurrency-patterns.md, references/anti-patterns.md, references/templates/view.md, references/templates/viewmodel.md, references/templates/service.md, references/templates/protocol.md, references/templates/model.md
- related-skills:
- swift-core, swiftui-core, ios, macos, ipados, watchos, visionos, tvos
SOLID Swift - Apple Best Practices 2026
Agent Workflow (MANDATORY)
Before ANY implementation, use TeamCreate to spawn 3 agents:
- fuse-ai-pilot:explore-codebase - Analyze existing architecture
- fuse-ai-pilot:research-expert - Verify Swift/Apple docs via Apple Docs MCP + Context7
- XcodeBuildMCP - Build validation after code changes. Then run fuse-ai-pilot:sniper.
DRY - Reuse Before Creating (MANDATORY)
Before writing ANY new code:
- Grep the codebase for similar protocols, services, or logic
- Check shared locations:
Core/Extensions/,Core/Utilities/,Core/Protocols/ - If similar code exists -> extend/reuse instead of duplicate
- If code will be used by 2+ features -> create it in
Core/directly
Architecture (Features Modular MANDATORY)
| Layer | Location | Max Lines |
|-------|----------|-----------|
| Views | Features/[Feature]/Views/ | 80 |
| ViewModels | Features/[Feature]/ViewModels/ | 100 |
| Services | Features/[Feature]/Services/ | 100 |
| Protocols | Features/[Feature]/Protocols/ | 30 |
| Shared | Core/{Models,Protocols,Services,Extensions,Utilities}/ | - |
NEVER use flat Sources/ structure - always Features/[Feature]/
Critical Rules (MANDATORY)
| Rule | Value |
|------|-------|
| File limit | 100 lines (split at 90) |
| ViewModels | @MainActor @Observable |
| Protocols | Features/[Feature]/Protocols/ or Core/Protocols/ ONLY |
| Models | Sendable structs |
| Documentation | /// on all public APIs |
| Previews | Every View MUST have #Preview |
Reference Guide
Concepts
| Topic | Reference | When to consult | |-------|-----------|-----------------| | SOLID Overview | solid-principles.md | Quick reference all principles | | SRP | single-responsibility.md | Fat views/VMs, splitting files | | OCP | open-closed.md | Adding providers, extensibility | | LSP | liskov-substitution.md | Protocol contracts, testing | | ISP | interface-segregation.md | Fat protocols, splitting | | DIP | dependency-inversion.md | Injection, testing, mocking | | Concurrency | concurrency-patterns.md | Actors, @MainActor, Sendable | | Anti-Patterns | anti-patterns.md | Code smells detection |
Templates
| Template | When to use | |----------|-------------| | view.md | SwiftUI View with subviews and #Preview | | viewmodel.md | @Observable ViewModel with @MainActor | | service.md | API Service, Mock, Cache actor | | protocol.md | Service protocol, CQRS, Auth | | model.md | Model, DTO, Error, Enum |
Forbidden
| Anti-Pattern | Fix |
|--------------|-----|
| Files > 100 lines | Split at 90 |
| Protocols in impl files | Move to Protocols/ directory |
| ObservableObject | Use @Observable |
| Completion handlers | Use async/await |
| Missing #Preview | Add preview for every View |
| Non-Sendable in async | Use struct with let |
| Flat Sources/ structure | Use Features/[Feature]/ |
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