Technology

AG-UI

AG-UI (Agent-User Interaction Protocol) is the open, lightweight standard for streaming real-time, bi-directional JSON events between any AI agent backend and a user-facing frontend.

AG-UI is the Agent-User Interaction Protocol: a standardized, event-based layer that solves the 'last mile' problem for AI agents. It operates over standard web transports like HTTP and Server-Sent Events (SSE), streaming a single, ordered sequence of JSON events—specifically, messages, tool calls, and state patches—to maintain perfect real-time synchronization between your agent and the UI . This open protocol eliminates the need for custom WebSocket formats or ad-hoc integrations, ensuring backend flexibility: you can swap between models like OpenAI, Ollama, or LangGraph without touching the frontend . Implementations are available via TypeScript and Python SDKs, making it the definitive contract for building reliable, production-ready agentic applications .