iOS SwiftData

Use When

• Comprehensive SwiftData API reference (iOS 17+) — @Model, @Attribute, @Relationship, ModelContainer, ModelContext, FetchDescriptor, @Query, schema migrations, ModelActor for background work, CloudKit requirements, testing, and 10 anti-patterns. Use alongside ios-data-persistence for offline-first sync engine.
• The task needs reusable judgment, domain constraints, or a proven workflow rather than ad hoc advice.

Do Not Use When

• The task is unrelated to ios-swiftdata or would be better handled by a more specific companion skill.
• The request only needs a trivial answer and none of this skill's constraints or references materially help.

Required Inputs

• Gather relevant project context, constraints, and the concrete problem to solve; load references only as needed.
• Confirm the desired deliverable: design, code, review, migration plan, audit, or documentation.

Workflow