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AG-UI: The Agent-User Interaction Protocol

An agent's work is long-running and partial, so a request/response API cannot express it: the interface needs to show thinking, a tool call in flight, a half-written answer, and state that changed underneath. AG-UI standardizes that as one stream of typed events, which is what lets you ship an agent into a customer's own frontend instead of rebuilding a UI per deployment.

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RELATED CONCEPTS

Agent-to-Agent Interoperability (A2A)MCP (Model Context Protocol)Streaming and Backpressure Bounded Autonomy and Human-in-the-Loop The ReAct Loop (Reason, Act, Observe)

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