Headless Interrupt (Strategy B — Promise-Based)

Out-of-chat time-picker popup driven by useFrontendTool with an async handler. The popup appears in the app surface (left pane), outside the chat. Picking a slot resolves the tool call and the agent confirms in chat.

How It Works

1. User asks to schedule a meeting via the chat (right pane)
2. Backend scheduling agent calls schedule_meeting (a frontend tool)
3. Frontend renders a TimeSlotPopup in the app surface (left pane)
4. User picks a slot or cancels
5. The Promise resolves, popup vanishes, agent confirms in chat

Backend

Shares the same scheduling agent as gen-ui-interrupt — the only difference is the frontend UX (external popup vs. inline chat card).

Reference

• ms-agent-python interrupt-headless — the reference implementation.
• langgraph-python interrupt-headless — the canonical LangGraph version.