axiom▌

Command-line interface for Instruments profiling. Enables headless performance analysis without GUI.

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.

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

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

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

Profile and optimize Swift async/await code using Instruments.

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.

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

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