Material 3 Expressive React client for AG-UI

[romulloqueiroz]

I've built an open source Material 3 Expressive UI client for AG-UI.

The underlying UI library implements Google's Material 3 Expressive Android tokens in React. This package adds an AG-UI-native layer on top of it, using @ag-ui/client directly.

It currently supports streaming messages and reasoning, tool calls, generative UI, shared state, and HITL interrupts/resume.

I just released 0.2.0, which also handles shared state changing while someone is editing during a HITL flow. Streamed state stays authoritative, human edits are kept separately, and stale approvals can't overwrite newer state.

There's also a React-free protocol projection and an optional CopilotKit adapter.

Demo: m3e.language-lit.com/ag-ui
GitHub: Language-Lit/material3-expressive-ag-ui
npm: @language-lit/material3-expressive-ag-ui

I'd be happy to contribute and maintain this as a community AG-UI client. Would it make sense to include it in the AG-UI Clients/community ecosystem?

Happy to open a PR or make any changes needed for that.

m3e-demo.mp4