Use when working with ANY data persistence, database, storage, CloudKit, migration, or serialization. Covers SwiftData, Core Data, GRDB, SQLite, CloudKit sync, file storage, Codable, migrations.
This skill inherits all available tools. When active, it can use any tool Claude has access to.
You MUST use this skill for ANY data persistence, database, storage, CloudKit, or serialization work.
Use this router when working with:
Working with SwiftData → /skill swiftdata
Schema migration → /skill swiftdata-migration
Migration issues → /skill swiftdata-migration-diag
Migrating from Realm → /skill realm-migration-ref
SwiftData vs SQLiteData → /skill swiftdata-to-sqlitedata
GRDB queries → /skill grdb
SQLiteData → /skill sqlitedata
Advanced SQLiteData → /skill sqlitedata-ref
Core Data issues → /skill core-data-diag
Database migration safety → /skill database-migration (critical - prevents data loss)
Codable issues → /skill codable
CloudKit → /skill cloudkit-ref
iCloud Drive → /skill icloud-drive-ref
Cloud sync errors → /skill cloud-sync-diag
Storage strategy → /skill storage-strategy
Storage issues → /skill storage-diag
Storage management → /skill storage-management-ref
File protection → /skill file-protection-ref
User asks about data/storage
├─ Database?
│ ├─ SwiftData? → swiftdata, swiftdata-migration
│ ├─ Core Data? → core-data-diag
│ ├─ GRDB? → grdb
│ └─ SQLiteData? → sqlitedata
│
├─ Migration? → database-migration (ALWAYS - prevents data loss)
│
├─ Cloud storage?
│ ├─ CloudKit? → cloudkit-ref
│ ├─ iCloud Drive? → icloud-drive-ref
│ └─ Sync errors? → cloud-sync-diag
│
├─ Serialization? → codable
│
└─ File storage? → storage-strategy, storage-diag, storage-management-ref
ALWAYS invoke /skill database-migration when adding/modifying database columns.
This prevents:
User: "I need to add a column to my SwiftData model"
→ Invoke: /skill database-migration (critical - prevents data loss)
User: "How do I query SwiftData with complex filters?"
→ Invoke: /skill swiftdata
User: "CloudKit sync isn't working"
→ Invoke: /skill cloud-sync-diag
User: "Should I use SwiftData or SQLiteData?"
→ Invoke: /skill swiftdata-to-sqlitedata