swiftdata-code-review
Reviews SwiftData code for model design, queries, concurrency, and migrations. Use when reviewing .swift files with import SwiftData, @Model, @Query, @ModelActor, or VersionedSchema.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/existential-birds/beagle --skill swiftdata-code-review- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads swiftdata-code-review automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
SwiftData Code Review
Quick Reference
| Issue Type | Reference |
|---|---|
| @Model, @Attribute, @Relationship, delete rules | references/model-design.md |
| @Query, #Predicate, FetchDescriptor, #Index | references/queries.md |
| @ModelActor, ModelContext, background operations | references/concurrency.md |
| VersionedSchema, MigrationStage, lightweight/custom | references/migrations.md |
Hard gates (before reporting findings)
Run in order; do not assert an issue until the gate for that issue passes.
- Scope — pass when: You have the target
.swiftpath(s) and confirmed SwiftData surface in scope (e.g.import SwiftData,@Model,@Query,@ModelActor,VersionedSchema, or migration types). If none apply, stop or narrow scope with one sentence. - Reference — pass when: For each checklist area you evaluate (models, queries, concurrency, migrations), you opened the matching
references/*.mdfrom the Quick Reference table or wroteN/A: no <area> in this reviewwith a one-line reason. - Evidence — pass when: Every finding uses the
[FILE:LINE] ISSUE_TITLEheader (line range allowed) from the file you read; no finding without a cite. - Report — pass when: Findings list cites first (or inline) using
[FILE:LINE] ISSUE_TITLE, then severity or checklist grouping—no uncited assertions.
Review Checklist
- Models marked
final(subclassing crashes) - @Relationship decorator on ONE side only (not both)
- Delete rules explicitly set (not relying on default .nullify)
- Relationships initialized to empty arrays, not default objects
- Batch operations used for bulk inserts (
append(contentsOf:)) - @Query not loading thousands of items on main thread
- External values in predicates captured in local variables
- Scalar comparisons in predicates (not object references)
- @ModelActor used for background operations
- PersistentIdentifier/DTOs used to pass data between actors
- VersionedSchema defined for each shipped version
- MigrationPlan passed to ModelContainer
When to Load References
- Reviewing @Model or relationships -> model-design.md
- Reviewing @Query or #Predicate -> queries.md
- Reviewing @ModelActor or background work -> concurrency.md
- Reviewing schema changes or migrations -> migrations.md
Review Questions
- Could this relationship assignment cause NULL foreign keys?
- Is @Relationship on both sides creating circular references?
- Could this @Query block the main thread with large datasets?
- Are model objects being passed between actors unsafely?
- Would schema changes require a migration plan?
FAQ
What does the swiftdata-code-review skill do?
Reviews SwiftData code for model design, queries, concurrency, and migrations. Use when reviewing .swift files with import SwiftData, @Model, @Query, @ModelActor, or VersionedSchema.
How do I install swiftdata-code-review?
Run npx skills add https://github.com/existential-birds/beagle --skill swiftdata-code-review in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/swiftdata-code-review/ (personal) or .claude/skills/swiftdata-code-review/ (project).
Which AI agents can use swiftdata-code-review?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is swiftdata-code-review safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains swiftdata-code-review?
It is published by existential-birds in existential-birds/beagle. It has 131 recorded installs.
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