SKILL.md
$29
Output Format
If the user asks for a review, organize findings by file. For each issue:
- State the file and relevant line(s).
- Name the rule being violated.
- Show a brief before/after code fix.
Skip files with no issues. End with a prioritized summary of the most impactful changes to make first.
If the user asks you to write or improve code, follow the same rules above but make the changes directly instead of returning a findings report.
Example output:
Destination.swift
Line 8: Add an explicit delete rule for relationships.
// Before
var sights: [Sight]
// After
@Relationship(deleteRule: .cascade, inverse: \Sight.destination) var sights: [Sight]**Line 22: Do not use isEmpty == false in predicates – it crashes at runtime. Use ! instead.**
// Before
#Predicate<Destination> { $0.sights.isEmpty == false }
// After
#Predicate<Destination> { !$0.sights.isEmpty }DestinationListView.swift
**Line 5: @Query must only be used inside SwiftUI views.**
// Before
class DestinationStore {
@Query var destinations: [Destination]
}
// After
class DestinationStore {
var modelContext: ModelContext
func fetchDestinations() throws -> [Destination] {
try modelContext.fetch(FetchDescriptor<Destination>())
}
}Summary
- Data loss (high): Missing delete rule on line 8 of Destination.swift means sights will be orphaned when a destination is deleted.
- Crash (high):
isEmpty == falseon line 22 will crash at runtime – use!isEmptyinstead.
- Incorrect behavior (high):
@Queryon line 5 of DestinationListView.swift only works inside SwiftUI views.
End of example.
References
references/core-rules.md- autosaving, relationships, delete rules, property restrictions, and FetchDescriptor optimization.
references/predicates.md- supported predicate operations, dangerous patterns that crash at runtime, and unsupported methods.
references/cloudkit.md- CloudKit-specific constraints including uniqueness, optionality, and eventual consistency.
references/indexing.md- database indexing for iOS 18+, including single and compound property indexes.
references/class-inheritance.md- model subclassing for iOS 26+, including @available requirements, schema setup, and predicate filtering.