Can it help prevent app crashes related to SwiftData?

Yes, it checks for common crash causes like missing 'final' keywords on models, circular relationship references, and unsafe object passing between actors.

Does it provide performance optimization for queries?

Absolutely. It checks @Query and #Predicate usage to ensure efficient data fetching and identifies cases where large datasets might impact UI responsiveness.

Does this skill support background processing in SwiftData?

Yes, it specifically reviews @ModelActor usage and ModelContext management to ensure background operations don't block the main thread.

How does it assist with SwiftData migrations?

The skill verifies that VersionedSchema and MigrationPlan are correctly implemented, ensuring safe transitions between different versions of your data model.

SwiftData Code Review

Name: SwiftData Code Review
Author: existential-birds

byexistential-birds

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Mobile Development

Reviews SwiftData code for optimal model design, query performance, thread safety, and schema migrations.

About

The SwiftData Code Review skill provides specialized guidance for developers building iOS and macOS applications using Apple's SwiftData framework. It automates the detection of common pitfalls such as circular references, main-thread blocking queries, and unsafe cross-actor data passing. By analyzing model decorators, relationship configurations, and background concurrency patterns using @ModelActor, it ensures your persistence layer remains performant, robust, and ready for schema evolution through versioned migrations.

Key Features

14 GitHub stars
Validates @Model and @Relationship configurations for correct design and delete rules
Detects performance bottlenecks in @Query and #Predicate usage
Verifies schema migration plans and VersionedSchema definitions for updates
Identifies potential runtime crashes related to model subclassing and null foreign keys
Ensures safe concurrency patterns and background operations using @ModelActor

Use Cases

Optimizing database query performance for large datasets in iOS apps
Performing automated peer reviews on SwiftData-heavy pull requests
Verifying complex schema migration logic before shipping app updates

About

Key Features

14 GitHub stars
Validates @Model and @Relationship configurations for correct design and delete rules
Detects performance bottlenecks in @Query and #Predicate usage
Verifies schema migration plans and VersionedSchema definitions for updates
Identifies potential runtime crashes related to model subclassing and null foreign keys
Ensures safe concurrency patterns and background operations using @ModelActor

Use Cases

Optimizing database query performance for large datasets in iOS apps
Performing automated peer reviews on SwiftData-heavy pull requests
Verifying complex schema migration logic before shipping app updates