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Cover image for Build with Google's new A2UI Spec: Agent User Interfaces with A2UI + AG-UI

Build with Google's new A2UI Spec: Agent User Interfaces with A2UI + AG-UI

Bonnie on December 16, 2025

TL;DR In this guide, you will learn how to build full-stack agent-to-user interface (A2UI) agents using the agent-to-agent (A2A) protoco...
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Maame Afua A. P. Fordjour

Finally, a guide that connects all the dots between A2A, AG-UI, and CopilotKit! The 'restaurant finder' example is perfect for showing why we need dynamic UIs instead of just chat bubbles. I'm definitely going to try building that backend executor to serve the JSON schema.

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Bonnie CopilotKit

Let me know how it turns out, Maame

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uliyahoo CopilotKit

Nice one Bonnie. A2UI's declarative generative UIs + CopilotKit is the future of agentic application development.

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Bonnie CopilotKit

Totally agree

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Fliin

This is great thanks for this!

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Bonnie CopilotKit

You are welcome, Fliin.

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Andrew

Well put tutorial. Also made understanding the differences between A2UI and AG-UI clear

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Bonnie CopilotKit

I am happy to hear that, Andrew.

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Sayeed

Nice seeing everyone integrating with AG-UI

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Bonnie CopilotKit

Totally agree.

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johny walker

Thanks for sharing!

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Bonnie CopilotKit

You are welcome, Johny.

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ethan_snow

Nice!

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Bonnie CopilotKit

Thanks, Ethan

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Danny T

Are there some basic materials I can review to see exactly what A2UI is?

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Nathan Tarbert CopilotKit

For sure, Google put out this blog yesterday.
developers.googleblog.com/introduc...

There's also more of a visual breakdown here: copilotkit.ai/ag-ui-and-a2ui

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Cameran

Bookmarking for sure. This looks cool!

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Bonnie CopilotKit

I am happy to hear that, Cameran.

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Nathan Tarbert CopilotKit

A2UI seems very practical in terms of standardizing UIs. I love how you show it working together with A2A and CopilotKit / AG-UI.
Nicely done!

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Bonnie CopilotKit

I am happy to hear that, Nathan.

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William

Cool Thanks Bonnie

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Bonnie CopilotKit

Happy to hear that, William.

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henryjohn21

Comprehensive article, thanks for sharing!

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Bonnie CopilotKit

You are welcome, Henry

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Jalissia_C

Wow, AI is really exploding. Google releases a new spec? I will be digging in for sure

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Bonnie CopilotKit

Yes they did.

This guide will create a good foundation on A2UI.

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Alex Hales67

Super interesting, I was just telling my boss this morning that we needed to figure out how to make dynamic contextual interfaces for onboarding clients onto one of our project

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Bonnie CopilotKit

I am sure A2UI will make it super simple.

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Zender

We're a Google shop and A2UI was a bit confusing because I thought it was competing with AG-UI but from my research it doesn't and this answered a lot of my questions