Integration · Scheduling

Connect Claude & ChatGPT to AddCal

Ask your AI to put an event in an AddCal calendar, see who has replied or send an invite to a new guest. It can create and update calendars and events, turn a pasted email or message into event details, and read RSVPs, invites and subscribers. It can also cancel invites and delete events, with your approval if you want it.

Connect AddCal free

Free plan, no credit card. Takes about a minute.

Try asking

“Add our webinar on 14 May, 15:00 to 16:00 Copenhagen time, to the Events calendar.”
The AI finds the calendar and creates the event with title, start and end, timezone and description.
“Here is the email from the venue. Make an event out of it.”
It pulls the title, date and location out of the text, then creates the event with those details.
“Who has said yes to the launch party?”
It finds the event and lists its RSVPs filtered by response type.

What your AI can do

Calendars and events

Create and update calendars and events with timezone, location, RSVP and recurrence, and search events in one calendar or across all of them.

RSVPs and invites

List, add and update RSVPs, send and cancel invites, and see who subscribes to a calendar.

Events from text

Turn an email or message into event details such as title, date and location before the event is created.

“Send an invite for the workshop to [email protected].”
It emails a calendar invite for the event to that address right away.
“Move Thursday's meetup to 18:30.”
It updates the event with the new start and end time in the same timezone.
“Who subscribes to our Club calendar?”
It lists the people subscribed to that calendar.

21 tools for AddCal

These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.

cancel_event_inviteDeletesCancel the invite sent to `email` for an event by `calendar_public_id` and `event_public_id`.
create_calendarChanges dataCreate a calendar with `name`, `timezone` and `week_begins`, plus optional description.
create_calendar_eventChanges dataCreate an event in a calendar by `calendar_public_id`: `title`, `date_start`, `date_end`, `timezone`, location, description, RSVP and recurrence.
create_event_rsvpChanges dataAdd an RSVP to an event with `name`, `email` and `response_type`.
delete_calendar_eventDeletesPermanently delete an event by `calendar_public_id` and `public_id`. Set `notify_invitees` to email invitees that it is cancelled.
extract_event_from_textChanges dataTurn free `text` (e.g. an email or message) into event details such as title, date and location, using an optional `timezone`.
get_calendarGet one calendar by `public_id`.
get_calendar_eventGet one event by `calendar_public_id` and `public_id`.
get_current_userGet the AddCal user this connection belongs to.
get_eventGet one event by its `event_public_id` alone, without knowing the calendar.
get_event_rsvpGet one RSVP by calendar, event and RSVP `public_id`.
list_calendar_subscribersList the people subscribed to a calendar by `calendar_public_id`.
list_calendarsList your calendars with their public IDs.
list_event_invitesList the invites sent for an event by `calendar_public_id` and `event_public_id`, optionally by status.
list_event_rsvpsList the RSVPs of an event by `calendar_public_id` and `event_public_id`, optionally by `response_type` or search text.
search_calendar_eventsSearch the events of one calendar by `calendar_public_id`, with `search` text, start/end date or range.
search_eventsSearch events across all calendars by `search` text, date range or calendar.
send_event_inviteVisible to othersEmail a calendar invite for an event to `email`. The invite is sent immediately.
update_calendarChanges dataUpdate a calendar's name, timezone, week start or description by `public_id`.
update_calendar_eventChanges dataUpdate an event by `calendar_public_id` and `public_id`; `title`, dates and `timezone` are required.
update_event_rsvpChanges dataUpdate an RSVP's name, email or response by calendar, event and RSVP `public_id`.

Set up in three steps

1
Pick the app
Create a free PipMCP account and choose AddCal from the app list.
2
Paste your key
Paste an AddCal API token. Sign in to AddCal, open the API Tokens page in your dashboard (addcal.co/user/api-tokens), create a token and copy it.
3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
1. Click your name, then Settings › Connectors › Add custom connector.
2. Paste your link as the Remote MCP server URL.
3. Switch it on from the + menu in a chat.

Questions

What can the AI do in AddCal?

The AI can list and read calendars, events, RSVPs, invites and subscribers, and search events. It can create and update calendars, events and RSVPs, turn text into event details, send and cancel invites and delete events.

Does the AI see my AddCal API token?

No. Your AddCal API token is encrypted at rest and never shown to the AI. After you save it, it is not shown again, not even to you. The AI only sees the results of the tools it calls.

Can I control what the AI is allowed to do?

Yes. You choose which tools are switched on, so you can start read-only. Sending an invite emails the guest immediately, and deleting an event is permanent and can notify invitees, so these can require your approval before they run. Every tool call is logged.

Does it work with ChatGPT?

Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your PipMCP link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.

What does it cost?

PipMCP has a free plan with no credit card required. Paid plans bill per completed task. You also need your own AddCal account.

Can the AI create an event from an email?

Yes. Paste the email or message into the chat and the AI can turn the text into event details such as title, date and location, using the timezone you give it. You can check the details before it creates the event.