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SwiftData migration failures manifest as production crashes, data loss, corrupted relationships, or simulator-only success. Core principle 90% of migration failures stem from missing models in VersionedSchema, relationship inverse issues, or untested migration paths—not SwiftData bugs.

Safe database schema evolution for production apps with user data. Core principle Migrations are immutable after shipping. Make them additive, idempotent, and thoroughly tested.

Comprehensive guide to privacy-first app design. Apple Design Award Social Impact winners handle data ethically, and privacy-first design is a key differentiator.

Profile and optimize Swift async/await code using Instruments.

Comprehensive guide to Codable protocol conformance for JSON and PropertyList encoding/decoding in Swift 6.x.

Systematic troubleshooting for Vision framework issues: subjects not detected, missing landmarks, low confidence, performance problems, coordinate mismatches, text recognition failures, barcode detection issues, and document scanning problems.

Discipline skill for Core Location implementation decisions. Prevents common authorization mistakes, battery drain, and background location failures.

Use this skill when:

Use when:

Energy issues manifest as battery drain, hot devices, and poor App Store reviews. Core principle: Measure before optimizing. Use Power Profiler to identify the dominant subsystem (CPU/GPU/Network/Location/Display), then apply targeted fixes.