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Swift · Databases / AGENT SKILL
apple-prisma-guide-swiftdata
0
Guide SwiftData implementation and review across persistence, relationships, predicates, indexing, and CloudKit.
SwiftData patterns — autosave, relationships, dangerous predicates, CloudKit constraints, indexing, class inheritance. Use when writing, reviewing, or debugging SwiftData code.
Understand the trade-offs.
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The full skill.
Original instructions from the publisher’s SKILL.md
> **Guide Skill** — This is an expert workflow/pattern guide, not API reference documentation. > Originally from [twostraws/SwiftData-Agent-Skill](https://github.com/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 | Topic | Reference | |-------|-----------| | Autosave, relationships, delete rules, `@Query` restrictions, `#Unique`, `@Transient` | `references/core-rules.md` | | Supported predicates, dangerous patterns that crash at runtime, unsupported methods | `references/predicates.md` | | CloudKit constraints: no `#Unique`, optional requirements, eventual consistency | `references/cloudkit.md` | | Database indexing (iOS 18+), single and compound property indexes | `references/indexing.md` | | Model subclassing (iOS 26+), `@available` requirements, predicate filtering | `references/class-inheritance.md` |