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Developer building blocks

AG-UI

A shared standard for connecting AI agents to the apps and screens people actually use.

What it does

AG-UI (Agent-User Interaction Protocol) is a set of rules for how an AI agent talks to the app in front of a person. A protocol is an agreed format, so different tools can work together.

With it, an agent can stream chat replies as they are written, keep information in sync with the app, show custom interface pieces, use tools inside the app, and pause for a person to approve a step.

Its makers say it complements two other standards: MCP, which gives agents tools, and A2A, which lets agents talk to each other.

Who it's for

Developers adding AI agents to websites and apps.

Can I use it without coding?

Developers only. A protocol and code libraries for programmers. New to this? Start here.

Can I run it?

Cost
FreeNothing to pay or sign up for.
API key
Not needed

Try it

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page. Copies with similar names exist for many popular projects.
  • License (MIT): Very permissive: free to use, change and share, including for business.
  • More on staying safe

Where people are talking about it