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Systematic Xcode build performance analysis and optimization. Core principle: Measure before optimizing, then optimize the critical path first.

Purpose: Comprehensive reference for file-based iCloud sync using ubiquitous containers Availability: iOS 5.0+ (basic), iOS 8.0+ (iCloud Drive), iOS 11.0+ (modern APIs) Context: File-based cloud storage, not database (use CloudKit for structured data)

Core principle: Core Data is a mature object graph and persistence framework. Use it when needing features SwiftData doesn't support, or when targeting older iOS versions.

Purpose: Comprehensive reference for file encryption and data protection APIs Availability: iOS 4.0+ (all protection levels), latest enhancements in iOS 26 Context: Built on iOS Data Protection architecture using hardware encryption

Comprehensive API reference for modern Core Location (iOS 17+).

Apple bundles for-LLM markdown documentation inside Xcode. These are authoritative, up-to-date guides and diagnostics written by Apple engineers. Use them alongside Axiom skills for the most accurate information.

Complete reference for TextKit 2 covering architecture, migration from TextKit 1, Writing Tools integration, and SwiftUI TextEditor with AttributedString through iOS 26.

Complete API reference for iOS energy optimization, with code examples from WWDC sessions and Apple documentation.

Profile and optimize Swift async/await code using Instruments.

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