hoangnguyen0403/ios-persistence
skills/ios/ios-persistence/SKILL.md
Implement local persistence with SwiftData, Core Data, and Keychain. Use when setting up SwiftData models, Core Data stacks, or local persistence in iOS.
$ install --global
skillsauthnpx skillsauth add hoangnguyen0403/agent-skills-standard ios-persistenceInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: May 14, 2026, 2:55 AM195.1s3 files scanned
SKILL.md
- name:
- ios-persistence
- description:
- Implement local persistence with SwiftData, Core Data, and Keychain. Use when setting up SwiftData models, Core Data stacks, or local persistence in iOS.
iOS Persistence
Priority: P0
Implementation Workflow
- Choose storage tier — SwiftData for iOS 17+, Core Data for legacy, Keychain for secrets, UserDefaults for flags only.
- Define models — Use
@Modelmacro (SwiftData) or.xcdatamodeld(Core Data). - Configure container — Use
@MainActorforModelContainer(SwiftData) orNSPersistentContainer(Core Data). - Perform background writes — Use
newBackgroundContext()(Core Data) to avoid UI lag; never heavy I/O onviewContext. - Secure sensitive data — Use Keychain for tokens and PII; never store in
UserDefaults.
See SwiftData and Core Data implementation examples
Anti-Patterns
- No Heavy I/O on
viewContext: Use private background contexts - No String-based Predicates: Use KeyPaths or generated helpers
- No Missing Merge Strategy: Set
mergePolicyexplicitly (e.g.,mergeByPropertyObjectTrump)
References
- SwiftData & Core Data Implementation
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