Quick overview This workflow exposes appointment management tools through an n8n MCP Server webhook so an external AI voice agent (for example, Vapi or Retell) can check availability, book appointments, suggest alternate slots, and cancel or reschedule existing bookings. How it works Receives an MCP tool request via the MCP Server Trigger webhook endpoint. When asked to verify a requested date and time, calls the “Check Slot Availability” sub-workflow to confirm whether the appointment slot is open. If the slot is available and caller details are confirmed, calls the “Book Appointment” sub-workflow to create the appointment. If the slot is unavailable, calls the “GET Alternate Slot” sub-workflow to return alternative available appointment times. For changes to existing bookings, calls either the “Cancel Appointment” or “Reschedule Appointment” sub-workflow using the caller’s phone number and appointment details. Setup Configure your external AI voice agent (for example, Vapi or Retell) to connect to this workflow’s MCP webhook URL and send tool requests to it.
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