@aiwerk/mcp-server-cal
OfficialServer Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| CAL_API_KEY | Yes | Cal.com API key (cal_ or cal_live_ prefix). Required when a tool is called. | |
| CAL_BASE_URL | No | Override the Cal.com API base URL. | https://api.cal.com/v2 |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
| prompts | {
"listChanged": true
} |
| resources | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| cal_list_bookingsB | List bookings with optional filters. Optional: status (upcoming|recurring|past|cancelled|unconfirmed), eventTypeId, dateFrom (ISO 8601), dateTo (ISO 8601), limit. |
| cal_get_bookingC | Get details of a specific booking by its UID. Required: uid. |
| cal_create_bookingC | Create a new booking. Required: eventTypeId, start (ISO 8601), attendeeName, attendeeEmail, attendeeTimezone. Optional: notes, guests (array of emails), metadata. |
| cal_cancel_bookingC | Cancel a booking by UID. Required: uid. Optional: cancellationReason. |
| cal_reschedule_bookingA | Reschedule a booking to a new time. Required: uid, newStart (ISO 8601). Optional: reschedulingReason. |
| cal_list_event_typesA | List all event types. Optional: teamId, userId to filter by team or user. |
| cal_get_event_typeB | Get details of a specific event type by ID. Required: id. |
| cal_create_event_typeB | Create a new event type. Required: title, slug, lengthInMinutes. Optional: description, locations, hidden, metadata. |
| cal_update_event_typeB | Update an existing event type. Required: id. Optional fields to update: title, slug, lengthInMinutes, description, locations, hidden, metadata. |
| cal_delete_event_typeC | Delete an event type by ID. Required: id. |
| cal_get_availabilityA | Get available time slots for an event type in a date range. Required: eventTypeId, dateFrom (ISO 8601), dateTo (ISO 8601). Optional: timeZone. |
| cal_list_schedulesA | List all schedules (working hours and availability rules). |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
| daily-schedule | Summarize today's schedule — shows all bookings and free slots |
| find-free-slot | |
| reschedule-suggestion |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
| upcoming-bookings | Upcoming bookings for today and tomorrow — automatically available in context |
| event-types | All configured event types — know what can be booked |
| schedules | Working hours and availability rules |
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