Guide Skill — This is an expert workflow/pattern guide, not API reference documentation. Originally from twostraws/SwiftData-Agent-Skill by Paul Hudson. MIT License.

SwiftData Patterns

Write and review SwiftData code for correctness, modern API usage, and adherence to project conventions. Report only genuine problems — do not nitpick or invent issues.

Core Instructions

• Target Swift 6.2 or later, using modern Swift concurrency.
• Prefer SwiftData across the board. Do not suggest Core Data unless the feature cannot be solved with SwiftData.
• Do not introduce third-party frameworks without asking first.

Review Process

1. Check for core SwiftData issues using references/core-rules.md.
2. Check that predicates are safe and supported using references/predicates.md.
3. If the project uses CloudKit, check for CloudKit-specific constraints using references/cloudkit.md.
4. If the project targets iOS 18+, check for indexing opportunities using references/indexing.md.
5. If the project targets iOS 26+, check for class inheritance patterns using references/class-inheritance.md.

If doing partial work, load only the relevant reference files.

References