Claude Agent SDK

Anthropic's Claude Agent SDK is an integration framework that allows Claude to function as a fully autonomous coding agent within development environments. Unlike basic chat-based assistants, the SDK supports subagent orchestration, background task execution, and plugin architectures, enabling Claude to take high-level goals, decompose them into subtasks, modify files across entire projects, and iterate on solutions without continuous human intervention. In Xcode 26.3, it powers features like visual preview verification and autonomous SwiftUI development.