Skill

guide-swiftdata

Reviews SwiftData code for patterns including autosave, relationships, safe predicates, CloudKit constraints, indexing, and class inheritance. Use when writing, reviewing, or debugging.

Swift

iOS

mobile

database

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Tool Access

This skill uses the workspace's default tool permissions.

Preview

> **Guide Skill** — This is an expert workflow/pattern guide, not API reference documentation.

Supporting Assets

references/class-inheritance.mdreferences/cloudkit.mdreferences/core-rules.mdreferences/indexing.mdreferences/predicates.md

SKILL.md

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Stars211

Forks8

Last CommitApr 12, 2026

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SwiftData Patterns

Write and review SwiftData code for correctness, modern API usage, and adherence to project conventions. Report only genuine problems — do not nitpick or invent issues.

Core Instructions

Target Swift 6.2 or later, using modern Swift concurrency.

Prefer SwiftData across the board. Do not suggest Core Data unless the feature cannot be solved with SwiftData.

Do not introduce third-party frameworks without asking first.

Review Process

Check for core SwiftData issues using references/core-rules.md.

Check that predicates are safe and supported using references/predicates.md.

If the project uses CloudKit, check for CloudKit-specific constraints using references/cloudkit.md.

If the project targets iOS 18+, check for indexing opportunities using references/indexing.md.

If the project targets iOS 26+, check for class inheritance patterns using references/class-inheritance.md.

If doing partial work, load only the relevant reference files.

References

Topic

Reference

Autosave, relationships, delete rules, @Query restrictions, #Unique, @Transient

references/core-rules.md

Supported predicates, dangerous patterns that crash at runtime, unsupported methods

references/predicates.md

CloudKit constraints: no #Unique, optional requirements, eventual consistency

references/cloudkit.md

Database indexing (iOS 18+), single and compound property indexes

references/indexing.md

Model subclassing (iOS 26+), @available requirements, predicate filtering

references/class-inheritance.md

Guide Skill — This is an expert workflow/pattern guide, not API reference documentation. Originally from twostraws/SwiftData-Agent-Skill by Paul Hudson. MIT License.