CopilotKit AG-UI Protocol Hits 30K Stars as Google, Microsoft, AWS, and LangChain Adopt Agent-User Interaction Standard

GitHub·high signal

CopilotKit's AG-UI (Agent-User Interaction) protocol has reached 30,200 GitHub stars and been adopted by Google, Microsoft, AWS, LangChain, Mastra, and PydanticAI as the standard for connecting agentic backends to frontend applications. AG-UI streams JSON events (messages, tool calls, state patches, lifecycle signals) over HTTP, filling the gap between MCP (context) and A2A (agent coordination) by defining the user-facing interaction layer. For builders wiring agents into React or Angular apps, this is becoming the de facto interface protocol.