axiom-ios-data

Original：🇺🇸 English

Translated

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.

3installs

Sourcecharleswiltgen/axiom

Added on2026-02-04

NPX Install

npx skill4agent add charleswiltgen/axiom axiom-ios-data

SKILL.md Content

View Translation Comparison →

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

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

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