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Agent-User Interaction Protocol (AG-UI)

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Agent-User Interaction Protocol (AG-UI)

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Mete Atamel

April 02, 2026
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  1. AG-UI is an open, lightweight, event-based protocol, created by the

    CopilotKit, that standardizes how agent backends connect to agent frontends Agent-User Interaction (AG-UI) Protocol docs.ag-ui.com
  2. • CopilotKit is the reference client implementation • Most major

    agent frameworks such as LangGraph, CrewAI, Google ADK, and more are supported
  3. • Event-Driven Communication: Agents emit 16 standardized event types during

    execution • Bidirectional Interaction: Agents accept input from users, enabling collaborative workflows with humans • Transport Agnostic: AG-UI doesn’t mandate how events are delivered, supporting various transport mechanisms including Server-Sent Events (SSE), webhooks, WebSockets, and more Main Benefits
  4. MCP gives agents tools A2A allows agents-to-agent communication AG-UI brings

    agents into user-facing applications AG-UI vs. MCP, A2A
  5. AG-UI connects frontends to agentic backends A2UI is a declarative

    generative UI spec, which agents can use to return UI widgets as part of their responses AG-UI vs. A2UI
  6. Thank you! Mete Atamel Developer Advocate at Google @meteatamel atamel.dev

    speakerdeck.com/meteatamel github.com/meteatamel/genai-beyond-basics/tree/main/samples/protocols/ag-ui