axiom▌

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.

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.

"Widgets are not mini apps. They're glanceable views into your app's data, rendered at strategic moments and displayed by the system. Extensions run in sandboxed environments with limited memory and execution time."

Purpose: Navigation hub for ALL storage decisions — database vs files, local vs cloud, specific locations iOS Version: iOS 17+ (iOS 26+ for latest features) Context: Complete storage decision framework integrating SwiftData (WWDC 2023), CKSyncEngine (WWDC 2023), and file management best practices