Agent to UI Protocol (A2UI) with Agent Development Kit (ADK)

A2UI and ADK
A2UI and ADK

In my Agent Protocols - MCP, A2A, A2UI, AG-UI post, I provided a high-level overview of some of the main agent protocols: MCP, A2A, A2UI, and AG-UI. In the Agent-User Interaction Protocol (AG-UI) with Agent Development Kit (ADK) post, I zoomed into the AG-UI protocol and showed how it can be used with Google’s Agent Development Kit (ADK).

In today’s post, I’ll zoom into the A2UI protocol and show how it can be used with Google’s Agent Development Kit (ADK).

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Agent-User Interaction Protocol (AG-UI) with Agent Development Kit (ADK)

AG-UI and ADK
AG-UI and ADK

In my previous post, I provided a high-level overview of some of the main agent protocols: MCP, A2A, A2UI, and AG-UI. In this post, I will zoom into the AG-UI protocol and show how it can be used with Google’s Agent Development Kit (ADK).

Recap: Agent-User Interaction Protocol (AG-UI)

AG-UI is an open, lightweight, event-based protocol, created by CopilotKit, that standardizes how agent backends connect to agent frontends.

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Agent Protocols - MCP, A2A, A2UI, AG-UI

Agent Protocols: MCP, A2A, A2UI, AG-UI
Agent Protocols: MCP, A2A, A2UI, AG-UI

It feels like every other month, there is a new agent protocol and it’s getting hard to keep track of which protocol is used when. Recently, I looked into some of the main agent protocols and in this post, I will provide a high-level overview of MCP, A2A, A2UI, and AG-UI.

TLDR

If you’re too busy or too impatient to read the whole blog post, here’s a summary of the protocols along with links to samples in my repository:

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