Individual skill

core-data

Build, review, or improve Core Data persistence in apps that have not adopted SwiftData. Use when working with NSManagedObject subclasses, NSFetchedResultsController for list-driven UI, NSBatchInsertRequest / NSBatchDeleteRequest / NSBatchUpdateRequest for bulk operations, NSPersistentHistoryChangeRequest for persistent history tracking and multi-target sync, NSStagedMigrationManager for staged schema migrations (iOS 17+), NSCompositeAttributeDescription for composite attributes (iOS 17+), or when integrating Core Data threading with Swift Concurrency. For Core Data + SwiftData coexistence or migration, see the swiftdata skill instead.

skills/core-data/SKILL.md

Source commit 8d90fd121a263355a4fb44fd082af1416a5c1c2a

What was checked

Matches the observed repository HEAD

Yes

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No

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No

Observed behavior

Not checked yet

Last checked

Nov 3, 2026

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