Agent skill
solid-swift
SOLID principles for Swift 6 and SwiftUI (iOS 26+). Files < 150 lines, protocols separated, @Observable, actors, Preview-driven development. Features Modular MANDATORY.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/solid-swift
SKILL.md
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 | 150 lines (split at 120) |
| 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 > 150 lines | Split at 120 |
| 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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