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Cal.com API v2
This skill provides guidance for AI agents to interact with the Cal.com API v2, enabling scheduling automation, booking management, and calendar integrations.
Base URL
All API requests should be made to:
https://api.cal.com/v2
Required Credentials
| Environment Variable | Required | Description |
|---|
CAL_API_KEY | Yes | Cal.com API key (prefixed with cal_live_ or cal_test_). Used as Bearer token for all API requests. Generate from Settings > Developer > API Keys. |
CAL_CLIENT_ID | No | OAuth client ID for platform integrations that manage users on behalf of others. Sent as x-cal-client-id header. |
CAL_SECRET_KEY | No | OAuth client secret for platform integrations. Sent as x-cal-secret-key header. |
CAL_WEBHOOK_SECRET | No | Secret for verifying webhook payload signatures via the X-Cal-Signature-256 header. |
Authentication
All API requests require authentication via Bearer token:
Authorization: Bearer cal_<your_api_key>
For detailed authentication methods including OAuth/Platform authentication, see references/authentication.md.
Core Concepts
Event Types define bookable meeting configurations (duration, location, availability rules). Each event type has a unique slug used in booking URLs.
Bookings are confirmed appointments created when someone books an event type. Each booking has a unique UID for identification.
Schedules define when a user is available for bookings. Users can have multiple schedules with different working hours.
Slots represent available time windows that can be booked based on event type configuration and user availability.
Reference Documentation
This skill includes detailed API reference documentation for each domain:
| Reference | Description |
|---|
references/authentication.md | API key and OAuth authentication, rate limiting, security best practices |
references/bookings.md | Create, list, cancel, reschedule bookings |
references/event-types.md | Configure bookable meeting types |
references/schedules.md | Manage user availability schedules |
references/slots-availability.md | Query available time slots |
references/calendars.md |
Quick Start
1. Check Available Slots
Before creating a booking, check available time slots:
GET /v2/slots?startTime=2024-01-15T00:00:00Z&endTime=2024-01-22T00:00:00Z&eventTypeId=123
See references/slots-availability.md for full details.
2. Create a Booking
POST /v2/bookings
Content-Type: application/json
{
"start": "2024-01-15T10:00:00Z",
"eventTypeId": 123,
"attendee": {
"name": "John Doe",
"email": "john@example.com",
"timeZone": "America/New_York"
}
}
See references/bookings.md for all booking operations.
3. Set Up Webhooks
Receive real-time notifications for booking events:
POST /v2/webhooks
Content-Type: application/json
{
"subscriberUrl": "https://your-app.com/webhook",
"triggers": ["BOOKING_CREATED", "BOOKING_CANCELLED"]
}
See references/webhooks.md for available triggers and payload formats.
Common Workflows
Book a meeting : Check slots -> Create booking -> Store booking UID
Reschedule : Get new slots -> POST /v2/bookings/{uid}/reschedule
Cancel : POST /v2/bookings/{uid}/cancel with optional reason
Best Practices
- Always check slot availability before creating bookings
- Store booking UIDs for future operations (cancel, reschedule)
- Use ISO 8601 format for all timestamps
- Implement webhook handlers for real-time updates
- Handle rate limiting with exponential backoff
Additional Resources
Weekly Installs
93
Repository
calcom/cal.com
GitHub Stars
40.5K
First Seen
Feb 1, 2026
Security Audits
Gen Agent Trust HubPassSocketPassSnykFail
Installed on
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