### Install the ADK + AG-UI bridge ```bash pip install ag-ui-adk ``` ### Add `AGUIToolset()` to your agent Tool-based HITL (`useHumanInTheLoop`) registers the picker UI on the frontend; CopilotKit forwards the tool definition to your model through `AGUIToolset()`. ADK doesn't have a native `interrupt(...)` primitive like LangGraph — for graph-paused pauses, use the frontend Promise-based `useFrontendTool` pattern instead.