AG-UI
Agent-User Interaction protocol for streaming agent state and events into frontend apps.
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Use cases
About AG-UI
AG-UI is listed in our frameworks category and is aimed at builders. Agent-User Interaction protocol for streaming agent state and events into frontend apps. Pricing, as the maker states it: Open standard. Maturity: Mature. We last checked the official link on 2026-10-16.
What is AG-UI?
AG-UI is an open, lightweight, event-based protocol that standardizes how AI agents connect to user-facing applications, integrating agents, real-time user context and user interfaces.
You can build AG-UI-powered apps or new framework integrations from quickstarts, and try examples in the AG-UI Dojo.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: docs.ag-ui.com/introduction.
Who is AG-UI for?
Developers connecting agent backends to frontends who want a standard way to stream agent state and events.
AG-UI at a glance
- Open source: Yes (MIT License)
- GitHub: ag-ui-protocol/ag-ui · 16,740 stars (as of Oct 21, 2026)
Key features
- Open event-based protocol
- Agent-to-UI streaming of state and events
- Framework integration quickstarts
- AG-UI Dojo examples
AG-UI FAQ
What is AG-UI?
AG-UI is an open, lightweight, event-based protocol that standardizes how AI agents connect to user-facing applications, integrating agents, real-time user context and user interfaces.
Who is AG-UI for?
Developers connecting agent backends to frontends who want a standard way to stream agent state and events.
Is AG-UI free?
AG-UI's pricing, as the maker states it: Open standard. Check the official site for current plans.
Is AG-UI open source?
Yes. AG-UI is released under the MIT License, according to its GitHub repository.
What are alternatives to AG-UI?
Similar tools include CopilotKit, Golem, Atmosphere, Adala, Agent Service Toolkit and Agentlas.
AG-UI ratings and reviews
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AG-UI alternatives
Other frameworks tools in our directory. See all frameworks tools →
CopilotKit
Frontend stack for putting agents and generative UI into React and other apps, from the makers of the AG-UI protocol.
Golem
Agent-native platform for building durable agents and distributed apps that keep state and never duplicate work after a failure.
Atmosphere
Real-time AI agent runtime for the JVM that runs one agent class on Spring AI, LangChain4j and other backends with streaming, MCP, A2A and AG-UI.
Adala
HumanSignal's autonomous data-labeling agent framework, where agents learn labeling skills iteratively.
Agent Service Toolkit
Toolkit for running an agent service with LangGraph, FastAPI and Streamlit.
Agentlas
A local-first agent OS that keeps specialist agents in a hub and spins up a temporary orchestrator for each task, with reusable methods and your choice of model and host.
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