kurko/axiom-ios-data
ai/ios-skills/ios-axiom-ios-data/SKILL.md
Use when working with ANY data persistence, database, axiom-storage, CloudKit, migration, or serialization. Covers SwiftData, Core Data, GRDB, SQLite, CloudKit sync, file storage, Codable, migrations.
$ install --global
skillsauthnpx skillsauth add kurko/dotfiles axiom-ios-dataInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Apr 6, 2026, 1:39 PM17.2s1 file scanned
SKILL.md
- name:
- axiom-ios-data
- description:
- Use when working with ANY data persistence, database, axiom-storage, CloudKit, migration, or serialization. Covers SwiftData, Core Data, GRDB, SQLite, CloudKit sync, file storage, Codable, migrations.
- license:
- MIT
iOS Data & Persistence Router
You MUST use this skill for ANY data persistence, database, axiom-storage, CloudKit, or serialization work.
When to Use
Use this router when working with:
- Databases (SwiftData, Core Data, GRDB, SQLiteData)
- Schema migrations
- CloudKit sync
- File storage (iCloud Drive, local storage)
- Data serialization (Codable, JSON)
- Storage strategy decisions
Routing Logic
SwiftData
Working with SwiftData → /skill axiom-swiftdata
Schema migration → /skill axiom-swiftdata-migration
Migration issues → /skill axiom-swiftdata-migration-diag
Migrating from Realm → /skill axiom-realm-migration-ref
SwiftData vs SQLiteData → /skill axiom-sqlitedata-migration
Other Databases
GRDB queries → /skill axiom-grdb
SQLiteData → /skill axiom-sqlitedata
Advanced SQLiteData → /skill axiom-sqlitedata-ref
Core Data patterns → /skill axiom-core-data
Core Data issues → /skill axiom-core-data-diag
Migrations
Database migration safety → /skill axiom-database-migration (critical - prevents data loss)
Serialization
Codable issues → /skill axiom-codable
Cloud Storage
Cloud sync patterns → /skill axiom-cloud-sync
CloudKit → /skill axiom-cloudkit-ref
iCloud Drive → /skill axiom-icloud-drive-ref
Cloud sync errors → /skill axiom-cloud-sync-diag
File Storage
Storage strategy → /skill axiom-storage
Storage issues → /skill axiom-storage-diag
Storage management → /skill axiom-storage-management-ref
File protection → /skill axiom-file-protection-ref
Automated Scanning
Core Data audit → Launch core-data-auditor agent or /axiom:audit core-data (migration risks, thread-confinement, N+1 queries, production data loss)
Codable audit → Launch codable-auditor agent or /axiom:audit codable (try? swallowing errors, JSONSerialization, date handling)
iCloud audit → Launch icloud-auditor agent or /axiom:audit icloud (entitlement checks, file coordination, CloudKit anti-patterns)
Storage audit → Launch storage-auditor agent or /axiom:audit storage (wrong file locations, missing backup exclusions, data loss risks)
Decision Tree
- SwiftData? → swiftdata, swiftdata-migration
- Core Data? → core-data, core-data-diag
- GRDB? → grdb
- SQLiteData? → sqlitedata, sqlitedata-ref
- ANY schema migration? → database-migration (ALWAYS — prevents data loss)
- Realm migration? → realm-migration-ref
- SwiftData vs SQLiteData? → sqlitedata-migration
- Cloud sync architecture? → cloud-sync
- CloudKit? → cloudkit-ref
- iCloud Drive? → icloud-drive-ref
- Cloud sync errors? → cloud-sync-diag
- Codable/JSON serialization? → codable
- File storage strategy? → storage, storage-diag, storage-management-ref
- File protection? → file-protection-ref
- Want Core Data safety scan? → core-data-auditor (Agent)
- Want Codable anti-pattern scan? → codable-auditor (Agent)
- Want iCloud sync audit? → icloud-auditor (Agent)
- Want storage location audit? → storage-auditor (Agent)
Anti-Rationalization
| Thought | Reality | |---------|---------| | "Just adding a column, no migration needed" | Schema changes without migration crash users. database-migration prevents data loss. | | "I'll handle the migration manually" | Manual migrations miss edge cases. database-migration covers rollback and testing. | | "Simple query, I don't need the skill" | Query patterns prevent N+1 and thread-safety issues. The skill has copy-paste solutions. | | "CloudKit sync is straightforward" | CloudKit has 15+ failure modes. cloud-sync-diag diagnoses them systematically. | | "I know Codable well enough" | Codable has silent data loss traps (try? swallows errors). codable skill prevents production bugs. |
Critical Pattern: Migrations
ALWAYS invoke /skill axiom-database-migration when adding/modifying database columns.
This prevents:
- "FOREIGN KEY constraint failed" errors
- "no such column" crashes
- Data loss from unsafe migrations
Example Invocations
User: "I need to add a column to my SwiftData model"
→ Invoke: /skill axiom-database-migration (critical - prevents data loss)
User: "How do I query SwiftData with complex filters?"
→ Invoke: /skill axiom-swiftdata
User: "CloudKit sync isn't working"
→ Invoke: /skill axiom-cloud-sync-diag
User: "Should I use SwiftData or SQLiteData?"
→ Invoke: /skill axiom-sqlitedata-migration
User: "Check my Core Data code for safety issues"
→ Invoke: core-data-auditor agent
User: "Scan for Codable anti-patterns before release"
→ Invoke: codable-auditor agent
User: "Audit my iCloud sync implementation"
→ Invoke: icloud-auditor agent
User: "Check if my files are stored in the right locations"
→ Invoke: storage-auditor agent
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