Cal for AI agents

Cal.com is open-source scheduling software that gives people shareable booking pages, syncs their calendars, and coordinates meeting availability across a team. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Cal See the 175 actions ↓

SchedulingOAuth 2.0MCP + RESTcal.com

AUDIT LOG · CALPOLICY: acme-support

09:41:07 · claude · u_8f2read

cal.list_attendees

List all attendees✓ allowed · 212ms

09:41:08 · claude · u_8f2read

cal.get_teams_list

Get teams list✓ allowed · 164ms

09:41:09 · claude · u_8f2write

cal.create_team_event_type

Create team event type✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

cal.delete_team_by_id

Delete team by id✕ blocked · policy: deny

EVERY CAL CALL, ON THE RECORD

01 · USE CASES

What agents do in Cal.

Check availability before booking

Check a person's calendar availability before proposing a meeting time to an attendee.

Confirm a pending booking

Confirm a pending booking by its ID once both sides have agreed on the time.

Confirm before canceling a booking

Confirm before canceling a scheduled booking, since the attendee has to be notified once it's gone.

02 · ACTIONS

175 Cal actions, graded by risk.

Every Cal action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

cal.get_teams_list
Get teams list
cal.list_attendees
List all attendees
cal.list_event_types
List event types
cal.get_all_timezones
Get all timezones
cal.get_private_links
Get private links for team event type
cal.get_team_bookings
Get team bookings
cal.get_webhook_by_id
Get webhook by id
cal.get_team_schedules
Get team schedules
cal.get_organization_id
Get organization ID
cal.get_booking_references
Get booking references
cal.get_oauth_clients_user
Get oauth clients user
cal.get_stripe_connect_url
Get Stripe Connect URL for team
cal.get_team_routing_forms
Get team routing forms
cal.get_stripe_connect_info
Get stripe connect info
cal.list_booking_references
List booking references
cal.get_available_slots_info
Get available slots info

+ 63 MORE

write

Create and change things. Allow, or ask the user first.

cal.add_attendee
Add attendee
cal.post_webhook_event
Create webhook subscription
cal.update_private_link
Update private link
cal.update_webhook_by_id
Update webhook by id
cal.update_schedule_by_id
Update schedule by ID
cal.create_team_event_type
Create team event type
cal.update_team_event_type
Update team event type
cal.create_phone_call_event
Create phone call event
cal.create_team_invite_link
Create team invite link
cal.post_selected_calendars
Add selected calendar
cal.create_oauth_client_user
Create oauth client user
cal.post_new_booking_request
Create a new booking
cal.post_calendar_credentials
Post calendar credentials
cal.post_user_to_organization
Post user to organization
cal.create_team_in_organization
Create team in organization
cal.update_oauth_client_webhook
Update oauth client webhook

+ 54 MORE

destructive

Delete, cancel or archive. Ask first, or deny outright.

cal.delete_team_by_id
Delete team by id
cal.delete_org_webhook
Delete org webhook
cal.delete_selected_slot
Delete selected slot
cal.delete_user_schedule
Delete user schedule
cal.delete_webhook_by_id
Delete webhook by id
cal.delete_schedule_by_id
Delete schedule by id
cal.cancel_booking_via_uid
Cancel booking via uid
cal.delete_event_type_by_id
Delete event type by id
cal.delete_oauth_client_user
Delete OAuth Client Managed User
cal.delete_event_type_in_team
Delete event type in team
cal.delete_membership_in_team
Delete membership in team
cal.delete_selected_calendars
Delete selected calendars
cal.delete_oauth_client_webhook
Delete oauth client webhook
cal.delete_user_attribute_option
Delete user attribute option
cal.delete_organization_attribute
Delete organization attribute
cal.delete_team_from_organization
Delete team from organization

+ 10 MORE

03 · HOW IT WORKS

Cal in three steps.

01Your users connect CalThey sign in to Cal on Arc0 Connect, under your brand, and approve the access you ask for.
02You set the rulesReads run, writes like “create team event type” can wait for the user, and “delete team by id” can be denied outright.
03Any agent can actYour agent calls Cal through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('cal', {
  read: 'allow',
  write: 'ask',        // create_team_event_type
  destructive: 'deny',  // delete_team_by_id
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Cal connects.

Users sign in to Cal on Arc0 Connect and approve the scopes you request. Build with Arc0’s Cal OAuth app, or bring your own so the Cal consent screen names you. Tokens refresh automatically, and you can export them whenever you want.

The same Cal connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: API key · OAuth 2.0
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use Cal from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More scheduling apps.

Google Calendar50 actions

Calendly57 actions

Apaleo29 actions

Bookingmood142 actions

Eventbrite95 actions

Etermin78 actions

Ticket Tailor77 actions

Booqable49 actions

ALL SCHEDULING APPS →

07 · FAQ

Cal and Arc0, answered.

Q01

Can I use Cal with Claude, ChatGPT or Cursor?

Yes. Connect Cal to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Cal actions you allow.

Q02

How do users connect Cal?

Q03

Which Cal actions can my agent take?

175 in total: 79 read, 70 write and 26 destructive, such as “create team event type”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Cal?

Yes. Actions like “delete team by id” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Cal too?

Yes. The same Cal connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Cal into your agent.

Your users connect Cal once, under your brand. Your agent gets 175 actions behind your policies, with every call on the record.

Connect Cal Browse all apps →

Free to build · MCP + REST · Audit log on every plan