React chat interfaces with Vercel AI SDK v6, covering hooks, message parts, tool approval workflows, and 18 documented UI error solutions.

• Three core hooks: useChat for conversational AI, useCompletion for text generation, and useObject for structured output streaming
• Message content now accessed via .parts array (breaking change from v5) with support for text, tool invocations, files, reasoning, and source citations
• Tool approval workflows enable human-in-the-loop confirmation before execution, with auto-submit capability to continue conversations after approval
• Addresses 18 common errors including stream parsing failures, stale closure bugs in React Strict Mode, concurrent request race conditions, and tool approval edge cases
• Includes migration guide for v4→v5 breaking changes (input state management removed, append() replaced with sendMessage())