AG-UI Protocol

AG-UI is an open protocol and library designed to standardize communication between rich user interfaces and agents. Focused on direct user-facing agents, it uses middleware and client integrations to generalize across any frontend and backend. The protocol defines a consistent way for back-end agents to communicate with front-end applications, enabling real-time, stateful collaboration between AI and human users. It supports multiple transport protocols, including SSE and WebSockets, and provides standardized event types to represent different states of agent execution. Built-in support is available for popular agentic frameworks such as LangGraph and Pydantic AI, with community integrations for others.