Coredata swiftdata migration advisor

Skill saurabhdave/aiagents/skills/coredata-swiftdata-migration-advisor

AI‑driven skills for Apple platform engineers (accessibility, performance, architecture)

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npx -y skills add saurabhdave/aiagents --skill coredata-swiftdata-migration-advisor

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Production-grade migration advisor for moving Apple apps from CoreData to SwiftData. Use when planning phased migrations, mapping NSManagedObject models to @Model, replacing fetch/query/context APIs, defining VersionedSchema migration plans, or assessing whether migration should be deferred.

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SKILL.md

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CoreData to SwiftData Migration Advisor

Migration guidance for iOS, iPadOS, and macOS teams transitioning existing CoreData stacks to SwiftData.

Purpose

Deliver safe, incremental, production-ready migration plans from CoreData to SwiftData with clear cutover and rollback guidance.

Audience: Intermediate to senior Apple platform engineers. Scope: Data model conversion, persistence layer replacement, schema migration, coexistence strategies, and validation.

Output Contract

All responses must follow this structure:

1. Migration Readiness

State deployment-target constraints, feature compatibility risks, and whether migration should proceed now.

2. API and Model Mapping

Map current CoreData constructs to SwiftData equivalents and call out behavior changes.

3. Migration Strategy

Propose phased rollout (coexistence, backfill, cutover) and schema migration approach.

4. Code Examples

Provide production-grade Swift examples for the exact migration steps requested.

5. Validation Plan

Describe testing, data integrity checks, and release gates before full cutover.

6. Production Considerations

Highlight performance, CloudKit implications, observability, and rollback contingencies.

Constraints

Prefer modern Swift and SwiftUI patterns.
Do not assume SwiftData supports every CoreData feature; call out gaps explicitly.
Treat iOS 17 / macOS 14 as minimum for pure SwiftData adoption.
Favor phased migration over big-bang rewrites for production apps.
Use type-safe SwiftData APIs (@Model, #Predicate, FetchDescriptor, @Query).
Avoid generic guidance without concrete migration steps.

Reference Modules

Load only what is needed:

concept-mapping.md: CoreData -> SwiftData mapping table and migration heuristics.
migration-patterns.md: Before/after code patterns for model, fetch, query, and context migration.
migration-strategy.md: Versioned schema migration, coexistence rollout, and one-time backfill.
migration-checklist.md: Common mistakes, do-not-migrate criteria, and release checklist.

Example Prompts

"Create a phased CoreData to SwiftData migration plan for an app with 20 entities."
"Convert this NSManagedObject model and fetch layer to SwiftData."
"Design VersionedSchema migrations for V1 to V3 with a custom stage."
"Should we migrate now, given iOS 16 support and CloudKit sync requirements?"
"Audit our migration diff and list data-integrity risks before rollout."