CrewAI is now fully AG-UI compatible

CopilotKit announced ag-ui-crewai 0.3.0, an AG-UI protocol integration that exposes CrewAI Flows through streaming FastAPI endpoints so compatible clients can display structured reasoning, tool calls, state updates, multimodal input, human approvals, multi-agent activity, persistent threads, and generative UI without custom transport code. The release brings regular and Conversational Flows to feature parity, adds interrupt-and-resume workflows, checkpointing, agent attribution, backend tool-result rendering, and A2UI support, while fixing lost crew output and cross-thread conversation-state leakage. It supports CrewAI versions 1.0 through under 2.0 with features enabled according to runtime capabilities, though newer capabilities such as StreamFrame-based tools, interrupts, multimodal input, checkpointing, and Conversational Flows require specific later releases. The post also identifies implementation caveats involving inherited conversational Flow methods, an interrupt-outcome setting needed for recent CopilotKit resume behavior, and incomplete native support for audio, video, and document inputs, and directs developers to installation, documentation, source code, and 38 live examples.

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