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Easily Build a Frontend for your AWS Strands Agents using AG-UI in 30 minutes

Bonnie on December 08, 2025

TL;DR In this guide, you will learn how to build a frontend for your AWS Strands Agents using AG-UI Protocol and CopilotKit. AWS Strands...
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uliyahoo CopilotKit

This is huge

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Bonnie CopilotKit

Totally agree.

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David

Learned a lot, thanks!

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Bonnie CopilotKit

I am happy to hear that, David

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Nathan Tarbert CopilotKit

That's great!

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Art light

That's awesome!

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Bonnie CopilotKit

I am happy to hear that.

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Fliin

Comprehensive tutorial. We are an AWS shop and would love to go through this starter build to see if it's a good fit for what we are trying to accomplish.

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Nathan Tarbert CopilotKit

Hey Fliin, feel free to reach out to me on Twitter @nathan_tarbert

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Bonnie CopilotKit

You can talk to @nathan_tarbert.

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Luis Prott

Nice, we are building with AWS Strands. Where do I go if I get hung up?

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Bonnie CopilotKit

You can check out CopilotKit Discord server.

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Nathan Tarbert CopilotKit

Hi Luis, there is a CopilotKit Discord community where we'd be happy to answer your questions.

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Nathan Tarbert CopilotKit

Amazing to see a tutorial using AWS Strands agents!
Nicely done, Bonnie!

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Bonnie CopilotKit

Thanks, Nathan.

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Andrew

Very interesting, going to share this with our team.

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Bonnie CopilotKit

I am happy to hear that, Andrew.

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Hajeem Usef

Cool article saved it

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Bonnie CopilotKit

I am happy to hear that, Hajeem.

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ethan_snow

Been waiting for this from copilotKit! Thanks Bonnie

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Bonnie CopilotKit

I am happy to hear that, Ethan.

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Eli Berman CopilotKit

Great stuff and was super easy to follow!

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Bonnie CopilotKit

I am happy to hear that, Eli!

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Steve

I'm new to agents so this looks like a decent way to get started. Thanks

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Bonnie CopilotKit

You are welcome, Steve.

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rokoss21

Great walkthrough on building agent frontends! One thing worth considering as you scale: contract specification between the frontend and agents.

The AG-UI protocol and CopilotKit are doing important work exposing agent capabilities to the frontend. But what happens when:

  • The agent evolves and changes what tools it can call?
  • The frontend needs to validate agent outputs before rendering?
  • You have multiple agents with different tool sets?

This is essentially the frontend/agent contract problem. Right now it's handled through implicit protocols and documentation. But as complexity grows, explicit contracts become critical.

Something like FACET could complement this approach:

  • Agent capability specs formally defined (not just documented)
  • Type-safe contracts between frontend and agent backend
  • Validation at the boundary — ensures agent outputs are valid before the UI renders them
  • Deterministic tool specifications — so the frontend always knows what the agent can do

The pattern would be:

  1. Define agent capabilities in FACET (canonical schemas, tool specs)
  2. CopilotKit/AG-UI consumes those specs
  3. Frontend renders safely, knowing the contract is enforced

Excellent foundation for AI-powered UX — would love to see where you take this!

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Sayeed

This is great but I'm still not sure where AGUI fits in