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Apple Documentation Access ​

Router skill providing direct access to Apple's official for-LLM markdown documentation bundled inside Xcode. 20 guide topics and 32 Swift compiler diagnostics, written by Apple engineers.

When to Use ​

Use this skill when:

  • You need the exact API signature or behavior from Apple
  • A Swift compiler diagnostic needs explanation with examples
  • Axiom skills reference an Apple framework and you want the official source
  • You want authoritative code examples for Liquid Glass, Foundation Models, SwiftData, or Swift 6.2 concurrency

Priority: Axiom skills provide opinionated guidance (decision trees, anti-patterns, pressure scenarios). Apple docs provide authoritative API details. Use both together.

Example Prompts ​

  • "What does the Swift compiler error 'actor-isolated call from nonisolated context' mean?"
  • "Show me Apple's official guide for implementing Liquid Glass in SwiftUI"
  • "How does Apple recommend using Foundation Models on-device?"
  • "What's the official pattern for SwiftData class inheritance?"

What's Covered ​

Guide Topics (20) ​

UI & Design -- Liquid Glass (SwiftUI, UIKit, AppKit, WidgetKit), toolbar features, styled text editing, WebKit integration, AlarmKit integration, Swift Charts 3D, Foundation AttributedString

Data & Persistence -- SwiftData class inheritance

Concurrency & Performance -- Swift 6.2 concurrency updates, InlineArray and Span

Apple Intelligence -- Foundation Models (on-device LLM)

System Integration -- App Intents updates, StoreKit updates, MapKit GeoToolbox, Widgets for visionOS

Accessibility -- Assistive Access in iOS

Computer Vision -- Visual Intelligence in iOS

Swift Compiler Diagnostics (32) ​

Official explanations with code examples for concurrency errors (actor isolation, Sendable, data races), type system diagnostics (existential any, opaque types, protocol conformance), and build/migration diagnostics (deprecated declarations, strict language features, module visibility).

How It Works ​

Apple bundles for-LLM markdown documentation inside Xcode at two locations:

  • AdditionalDocumentation -- Framework guides with implementation patterns
  • Swift diagnostics -- Compiler error/warning explanations with before/after code

Axiom's MCP server reads these files at runtime from the local Xcode installation. They stay current when Xcode updates.

Configuration ​

VariableDefaultPurpose
AXIOM_XCODE_PATH/Applications/Xcode.appCustom Xcode path (e.g., Xcode-beta.app)
AXIOM_APPLE_DOCStrueSet to false to disable Apple docs loading

Documentation Scope ​

This page documents the axiom-apple-docs router skill. The router maps user questions to specific Apple doc files (prefixed apple-guide-* and apple-diag-*).

Released under the MIT License

Copyright © 2026 Charles Wiltgen • v2.26.0