ag-ui

Why we included this project

AG-UI is an open, event-based protocol for connecting AI agent backends to user-facing frontends. Instead of writing bespoke glue for each integration, you get a shared contract: agent backends emit one of roughly sixteen standard event types, and the UI can stream tokens, render tool output, surface thinking steps, and pause for human approval. A middleware layer lets the same protocol run over SSE, WebSockets, or webhooks and tolerates loose event-format matching, so it works across different agent runtimes and app stacks. The protocol also handles the parts that usually turn into fragile custom wiring, like interrupts, sub-agents, shared state, and frontend tool calls. It is a protocol and reference implementation rather than a turnkey chatbot, so plan to connect it to your own agent runtime and UI framework.