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This skill empowers developers to leverage Apple's native Foundation Models framework for building privacy-focused, on-device AI features. It provides comprehensive guidance on implementing the SystemLanguageModel API, managing LanguageModelSessions, and utilizing guided generation for structured Swift outputs. Whether you are implementing custom tool calling, crafting effective prompts, or ensuring safety with guardrails, this skill offers the implementation patterns and best practices needed to deliver performant, localized AI experiences across Apple's ecosystem.