Automate Cal.com scheduling operations through Composio's Cal toolkit via Rube MCP.
Prerequisites
Rube MCP must be connected (RUBE_SEARCH_TOOLS available)
Active Cal.com connection via
RUBE_MANAGE_CONNECTIONS
with toolkit
cal
Always call
RUBE_SEARCH_TOOLS
first to get current tool schemas
Setup
Get Rube MCP
Add
https://rube.app/mcp
as an MCP server in your client configuration. No API keys needed — just add the endpoint and it works.
Verify Rube MCP is available by confirming
RUBE_SEARCH_TOOLS
responds
Call
RUBE_MANAGE_CONNECTIONS
with toolkit
cal
If connection is not ACTIVE, follow the returned auth link to complete Cal.com authentication
Confirm connection status shows ACTIVE before running any workflows
Core Workflows
1. Manage Bookings
When to use
User wants to list, create, or review bookings
Tool sequence
:
CAL_FETCH_ALL_BOOKINGS
- List all bookings with filters [Required]
CAL_POST_NEW_BOOKING_REQUEST
- Create a new booking [Optional]
Key parameters for listing
:
status
Filter by booking status ('upcoming', 'recurring', 'past', 'cancelled', 'unconfirmed')
afterStart
Filter bookings after this date (ISO 8601)
beforeEnd
Filter bookings before this date (ISO 8601)
Key parameters for creation
:
eventTypeId
Event type ID for the booking
start
Booking start time (ISO 8601)
end
Booking end time (ISO 8601)
name
Attendee name
email
Attendee email
timeZone
Attendee timezone (IANA format)
language
Attendee language code
metadata
Additional metadata object
Pitfalls
:
Date filters use ISO 8601 format with timezone (e.g., '2024-01-15T09:00:00Z')
eventTypeId
must reference a valid, active event type
Booking creation requires matching an available slot; check availability first
Time zone must be a valid IANA timezone string (e.g., 'America/New_York')
Status filter values are specific strings; invalid values return empty results
2. Check Availability
When to use
User wants to find free/busy times or available booking slots
Tool sequence
:
CAL_RETRIEVE_CALENDAR_BUSY_TIMES
- Get busy time blocks [Required]
CAL_GET_AVAILABLE_SLOTS_INFO
- Get specific available slots [Required]
Key parameters
:
dateFrom
Start date for availability check (YYYY-MM-DD)
dateTo
End date for availability check (YYYY-MM-DD)
eventTypeId
Event type to check slots for
timeZone
Timezone for the availability response
loggedInUsersTz
Timezone of the requesting user
Pitfalls
:
Busy times show when the user is NOT available
Available slots are specific to an event type's duration and configuration
Date range should be reasonable (not months in advance) to get accurate results
Timezone affects how slots are displayed; always specify explicitly
Availability reflects calendar integrations (Google Calendar, Outlook, etc.)
3. Configure Webhooks
When to use
User wants to set up or manage webhook notifications for booking events
Tool sequence
:
CAL_RETRIEVE_WEBHOOKS_LIST
- List existing webhooks [Required]
CAL_GET_WEBHOOK_BY_ID
- Get specific webhook details [Optional]
CAL_UPDATE_WEBHOOK_BY_ID
- Update webhook configuration [Optional]
CAL_DELETE_WEBHOOK_BY_ID
- Remove a webhook [Optional]
Key parameters
:
id
Webhook ID for GET/UPDATE/DELETE operations
subscriberUrl
Webhook endpoint URL
eventTriggers
Array of event types to trigger on
active
Whether the webhook is active
secret
Webhook signing secret
Pitfalls
:
Webhook URLs must be publicly accessible HTTPS endpoints
Event triggers include: 'BOOKING_CREATED', 'BOOKING_RESCHEDULED', 'BOOKING_CANCELLED', etc.
Inactive webhooks do not fire; toggle
active
to enable/disable
Webhook secrets are used for payload signature verification
4. Manage Teams
When to use
User wants to create, view, or manage teams and team event types
Tool sequence
:
CAL_GET_TEAMS_LIST
- List all teams [Required]
CAL_GET_TEAM_INFORMATION_BY_TEAM_ID
- Get specific team details [Optional]
CAL_CREATE_TEAM_IN_ORGANIZATION
- Create a new team [Optional]
CAL_RETRIEVE_TEAM_EVENT_TYPES
- List event types for a team [Optional]
Key parameters
:
teamId
Team identifier
name
Team name (for creation)
slug
URL-friendly team identifier
Pitfalls
:
Team creation may require organization-level permissions
Team event types are separate from personal event types
Team slugs must be URL-safe and unique within the organization
5. Organization Management
When to use
User wants to view organization details
Tool sequence
:
CAL_GET_ORGANIZATION_ID
- Get the organization ID [Required]
Key parameters
(none required)
Pitfalls
:
Organization ID is needed for team creation and org-level operations
Not all Cal.com accounts have organizations; personal plans may return errors
Common Patterns
Booking Creation Flow
1. Call CAL_GET_AVAILABLE_SLOTS_INFO to find open slots
2. Present available times to the user
3. Call CAL_POST_NEW_BOOKING_REQUEST with selected slot
4. Confirm booking creation response
ID Resolution
Team name -> Team ID
:
1. Call CAL_GET_TEAMS_LIST
2. Find team by name in response
3. Extract id field
Webhook Setup
1. Call CAL_RETRIEVE_WEBHOOKS_LIST to check existing hooks
2. Create or update webhook with desired triggers
3. Verify webhook fires on test booking
Known Pitfalls
Date/Time Formats
:
Booking times: ISO 8601 with timezone (e.g., '2024-01-15T09:00:00Z')
Availability dates: YYYY-MM-DD format
Always specify timezone explicitly to avoid confusion
Event Types
:
Event type IDs are numeric integers
Event types define duration, location, and booking rules
Disabled event types cannot accept new bookings
Permissions
:
Team operations require team membership or admin access
Organization operations require org-level permissions
Webhook management requires appropriate access level
Rate Limits
:
Cal.com API has rate limits per API key
Implement backoff on 429 responses
Quick Reference
Task
Tool Slug
Key Params
List bookings
CAL_FETCH_ALL_BOOKINGS
status, afterStart, beforeEnd
Create booking
CAL_POST_NEW_BOOKING_REQUEST
eventTypeId, start, end, name, email
Get busy times
CAL_RETRIEVE_CALENDAR_BUSY_TIMES
dateFrom, dateTo
Get available slots
CAL_GET_AVAILABLE_SLOTS_INFO
eventTypeId, dateFrom, dateTo
List webhooks
CAL_RETRIEVE_WEBHOOKS_LIST
(none)
Get webhook
CAL_GET_WEBHOOK_BY_ID
id
Update webhook
CAL_UPDATE_WEBHOOK_BY_ID
id, subscriberUrl, eventTriggers
Delete webhook
CAL_DELETE_WEBHOOK_BY_ID
id
List teams
CAL_GET_TEAMS_LIST
(none)
Get team
CAL_GET_TEAM_INFORMATION_BY_TEAM_ID
teamId
Create team
CAL_CREATE_TEAM_IN_ORGANIZATION
name, slug
Team event types
CAL_RETRIEVE_TEAM_EVENT_TYPES
teamId
Get org ID
CAL_GET_ORGANIZATION_ID
(none)
When to Use
This skill is applicable to execute the workflow or actions described in the overview.