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Agent frameworks & harnesses · Google logoGoogle

Editorial

A2UI

Open protocol for generative UI from agents. Google logoGoogle called version 1.0 the first stable release on November 11, 2026. The agent sends JSON components. The app renders them natively. Apache-2.0.

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Pricing

The GitHub logoGitHub repository a2ui-project/a2ui is Apache-2.0. Google logoGoogle does not list a fee for the protocol or the SDKs. You pay the model and the host you connect.

Vendor pricing checked November 12, 2026.

Best fit

Libraries and harnesses for building agents: the loop, tools, memory, and permissions around a model. Listed use: agents, coding. Listed audience: Builders.

Quick facts

Category
Agent frameworks & harnesses
Pricing
Open source
Status
Editorial
Vendor
Google
Last verified
November 12, 2026
Use
agents, coding

Features

  • Protocol version 1.0, announced November 11, 2026
  • Renderer SDKs for React, Angular, Lit, Flutter, and SwiftUI; Jetpack Compose still on v0.9.1 in the announcement
  • Agent SDKs for Python, TypeScript, and Dart
  • Carries over MCP as application/a2ui+json and over A2A at the v1.0 extension URI

Pricing

The GitHub logoGitHub repository a2ui-project/a2ui is Apache-2.0. Google logoGoogle does not list a fee for the protocol or the SDKs. You pay the model and the host you connect.

Open source

Social

GitHub

Google’s November 11, 2026 post calls A2UI 1.0 the first stable open protocol for generative UI. An agent describes components, data bindings, and function calls. The host draws them with native widgets from a catalog the app registered. The model does not send HTML.

The same post says Gemini supports A2UI 0.9.1 today, and that the Jetpack Compose renderer is v0.9.1 with v1.0 still coming. Web renderers (React, Angular, Lit), Flutter, and SwiftUI are in the “use it now” list. Agent SDKs are Python, TypeScript, and Dart. MCP Apps hosts such as Claude and Gemini can show the screens. The A2A extension URI for v1.0 is https://a2ui.org/a2a-extension/a2ui/v1.0.

GitHub’s repository API, read November 12, 2026, reported Apache-2.0 and 17,104 stars, with pushed_at 2026-11-12T04:02:10Z. PyPI a2ui-agent-sdk 0.11.0 uploaded at 2026-11-10T22:20:43Z. npm @a2ui/agent was still 0.1.0 from November 2. The package clocks, the 0.9.1 host gap, and how to add the protocol to a harness are A2UI 1.0 agent framework release November 2026.

A2UI is not one of the 19 repositories in the November 5 framework snapshot. The agent frameworks category is the directory shelf. MCP and A2A stay the tool link and the agent-to-agent link.

Tags

frameworkprotocolopen-sourceagents

Alternatives

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Category: Agent frameworks & harnesses

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A2UI is not a row on Best AI agent harness yet. The first rows of that sourced table are below. Order is not a quality score. Last verified November 2026.

  1. Claude Code
  2. Codex
  3. Claude Agent SDK

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