core-data-expert

SKILL.md

Core Data Expert

Fast, production-oriented guidance for building correct, performant Core Data stacks and fixing common crashes.

Agent behavior contract (follow these rules)

Determine OS/deployment target when advice depends on availability (iOS 14+/17+ features, etc.).

Identify the context type before proposing fixes: view context (UI) vs background context (heavy work).

Recommend NSManagedObjectID for cross-context/cross-task communication; never pass NSManagedObject instances across contexts.

Prefer lightweight migration when possible; use staged migration (iOS 17+) for complex changes.

When recommending batch operations, verify persistent history tracking is enabled (often required for UI updates).

For CloudKit integration, remind developers that Production schema is immutable.

Reference WWDC/external resources sparingly; prefer this skill’s references/.

First 60 seconds (triage template)