Overview
Tool name:Rex | Book Time in Calendar | Pro
Use this tool to create a Rex calendar event. See Calendar Booking Overview for how availability and booking work across providers.
Provider Settings
| ID | Setting | Type | Required | Default | What it does |
|---|---|---|---|---|---|
160 | calendar_id | string | No | team config | Rex calendar ID. If left blank, the tool falls back to team config. |
161 | user_ids | array/tags | No | team config | Rex user IDs for availability and booking. Can be entered as tags or comma-separated values. |
162 | contact_id | string | Yes | none | Rex contact ID to attach to the booking. |
163 | title | string | Yes | none | Appointment title for the Rex calendar event. |
164 | description | text | No | empty | Description written to the Rex event. |
165 | location | string | No | empty | Location text written to event_location.description. |
166 | duration_minutes | integer, minutes | No | 30 | Appointment duration. |
167 | business_days | array | No | provider/config default | Business days to offer, using ISO weekday numbers where Monday is 1 and Sunday is 7. Example: [1,2,3,4,5]. |
168 | business_hours | time range object | No | provider/config default | Business hours window to offer. Example: [0900,1730]. |
Common Settings
| ID | Setting | Type | Required | Default | What it does |
|---|---|---|---|---|---|
0 | Number of Weeks | integer | No | 4 | Weeks to check availability. Tool definition range is 1-8. |
1 | SMS Message | text | No | empty | Custom SMS confirmation message. Written to {{sms.message}}. |
3 | Booking Purpose | text | No | empty | Purpose of the appointment. Written to {{calendar.purpose}}. |
5 | Check Timezone Before Booking | boolean | No | false | Whether the flow verifies the user’s timezone before booking. Written to {{timezone.check_timezone}}. |
6 | Send SMS Confirmation | boolean | No | true | Whether to send an SMS confirmation after booking. Written to {{calendar.sms_flag}}. |
7 | Booking Window Start Offset (Minutes) | integer | No | 15 | Availability starts this many minutes after call start. |
Availability Behavior
Rex availability is calculated from the configured calendar, users, business days, business hours, and duration. The flow checks the user’s selected time against the loaded availability, then creates a Rex event attached to the configured contact.Global Variables Written or Maintained
| Variable | When set | Meaning |
|---|---|---|
{{calendar.purpose}} | Tool entry | Booking purpose configured on the tool. |
{{sms.message}} | Tool entry | Custom SMS confirmation message. |
{{timezone.check_timezone}} | Tool entry | Timezone verification flag. |
{{calendar.sms_flag}} | Tool entry | SMS confirmation flag. |
{{calendar.event_id}} | Availability load | Rex calendar or integration identifier. |
{{calendar.availability_spoken}} | Availability check | Spoken availability response. |
{{calendar.booking_time_raw}} | Slot validation and booking success | Exact selected slot in ISO date-time format. |
{{calendar.booking_time_spoken}} | Booking success | Spoken confirmation time. |
{{calendar.booking_time_written}} | Booking success | Written confirmation time. |
{{calendar.booking_id}} | Booking success | Rex event ID. |
{{calendar.booking_link}} | Booking success | Link returned by provider logic when available. Usually empty for Rex. |
Cancellation Behavior
If the user cancels during the same call, the flow uses the Rex cancellation path where supported. A successful cancellation clears the stored booking ID, booking link, and stored booking time values. Output variableresult is boolean true when the appointment was booked successfully.