AG-UI (Agent-User Interaction Protocol)
Event-based protocol that streams agent state, messages and tool calls between an agent backend and a user-facing app.
Reference by Originated at CopilotKit with LangChain and CrewAI as early partners
IndexedMIT★ 16,795
About
Defines a two-way stream of typed events between an agent backend and a frontend so any UI can drive any compatible agent.
Use cases: frontend-development, agent-orchestration
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About the protocol
- Specification
- docs.ag-ui.com/introduction
- Maintainer
- Originated at CopilotKit with LangChain and CrewAI as early partnersdocs.ag-ui.com
- First-party integrations include Microsoft Agent Framework, Google ADK, AWS Strands Agents, Mastra and Pydantic AI. docs.ag-ui.com
Signals
- Stars
- 16,795
- Forks
- 1,532
- Open issues
- 289
- Last commit
- Oct 24, 2026 (2 days ago)
- Last release
- Oct 21, 2026 (6 days ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- MIT
- Repository
- github.com/ag-ui-protocol/ag-ui
- Website
- docs.ag-ui.com/introduction
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
Cite this page
AG-UI (Agent-User Interaction Protocol). Agent Mart. https://agentmart.dev/reference/ag-ui-protocol (last updated 2026-10-24)