io.usefulapiPublished by usefulapi.ioOfficial publisherv1.23.3Updated Nov 7, 2026
Read AddEvent calendars, events, RSVPs and subscribers; create and update calendars and events.
The publisher's own server: Ably MCP by usefulapi
Hosted AddEvent server that lets an assistant read calendars, events, RSVP attendees and subscribers, and create or update calendars and events.
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.usefulapi%2Faddevent/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Add this to your client's mcpServers config.
{
"mcpServers": {
"addevent-by-usefulapi": {
"type": "http",
"url": "https://addevent.usefulapi.io/mcp"
}
}
}Use AddEvent from Claude, Cursor, or any MCP client — calendars, events, RSVP attendees, calendar subscribers and templates, plus creating events and calendars. Hosted, no local install: connect with your own AddEvent credentials.
Live endpoint: https://addevent.usefulapi.io/mcp · Homepage: https://usefulapi.io/addevent
https://addevent.usefulapi.io/mcp.claude mcp add --transport http addevent https://addevent.usefulapi.io/mcp, then run /mcp to log in.Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your AddEvent credentials.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/addevent/
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this server only. Subscribe with addevent_upgrade (it returns a Stripe Checkout link). Cancel any time with addevent_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running addevent_upgrade before then undoes the cancel. Or write to [email protected].
MIT © usefulapi. Not affiliated with or endorsed by AddEvent.
Source: servers/addevent/README.md at commit 4046075
List calendars
List the account's calendars (newest first by default) with id, title, timezone, whether it is the default calendar, landing-page links and counts of events and subscribers. GET /calendars.
pagesort_bypage_sizesort_ordercalendar_idsGet calendar
One calendar by id: title, timezone, week start, template ids, subscriber and event counts, links, custom data. GET /calendars/{id}.
calendar_idrequiredCreate calendar
WRITE: creates a new calendar in the AddEvent account (a new, empty calendar; nothing existing is changed and nobody is notified). Needs a title. POST /calendars.
titlerequiredtimezonecustom_datadescriptioninternal_nameweekday_begincalendar_colorlanding_page_template_idembeddable_calendar_template_idUpdate calendar
WRITE: changes fields of an existing calendar (only the fields you pass; the rest stay). Title, description and timezone changes show on its landing page and can reach people who subscribe to the calendar feed. Not reversible by this server (no previous values are kept), so read the calendar first. PATCH /calendars/{id}.
titletimezonecalendar_idrequiredcustom_datadescriptioninternal_nameweekday_begincalendar_colorlanding_page_template_idembeddable_calendar_template_idList events
Search the account's events (newest created first; by start time when a date filter is used): title, start/end, timezone, location, RSVP settings and stats, landing-page links. Filter by calendar, event ids, text, date window or a custom_data pair. GET /events.
pagesearchsort_byevent_idspage_sizeends_aftersort_ordercalendar_idsstarts_beforecustom_data_keycustom_data_valueGet event
One event by id (evt-...): all fields incl. description, organizer, reminder, recurring rule, RSVP settings and stats, custom data and share links. GET /events/{id}.
event_idrequiredCreate event
WRITE: creates a new event on a calendar (the account's default calendar if calendar_id is omitted). Creates a public event landing page and share links; it does not e-mail anyone, though people subscribed to that calendar's feed will see the event on their next sync. Needs title and datetime_start. POST /events.
colortitlerequiredlocationremindertimezonefree_busycalendar_idcustom_datadescriptionlocation_iddatetime_endrsvp_enabled+8 moreUpdate event
WRITE: changes fields of an existing event (only the fields you pass; the rest stay). The change goes live on its landing page and share links, and people who subscribed to the calendar or added the event with a live link are updated on their next calendar sync, so a time or location change can notify real people. No previous values are kept: read the event first. PATCH /events/{id}.
colortitleevent_idrequiredlocationremindertimezonefree_busycalendar_idcustom_datadescriptionlocation_iddatetime_end+9 moreList RSVP attendees
List RSVP attendees (personal data: e-mail addresses and the answers they gave on the RSVP form). Filter by calendar, event or response (going/maybe/not-going). Paged, 20 at most per page: read only what the task needs. IP address and coordinates are removed from the reply. GET /rsvps.
pagesort_byattendingevent_idspage_sizesort_ordercalendar_idsGet RSVP attendee
One RSVP attendee by id (personal data: e-mail and form answers; IP address and coordinates removed). GET /rsvps/{id}.
attendee_idrequiredCreate RSVP attendee
WRITE: adds ONE RSVP attendee (one e-mail address, personal data) to an event. This server never asks AddEvent to send the confirmation or organizer notification e-mails, but the event's own reminder and follow-up e-mails (if the event has them) will later go to this address, so only add someone who really RSVP'd. The e-mail must be unique per event. POST /events/{id}/rsvps.
emailrequiredevent_idrequiredattendingrsvp_form_dataUpdate RSVP attendee
WRITE: changes ONE RSVP attendee (email, response or form answers; only the fields you pass). The event's reminder and update e-mails go to the e-mail address stored here, so changing it redirects those e-mails to that person. This server never triggers the confirmation or organizer notification e-mails. PATCH /rsvps/{id}.
emailattendingattendee_idrequiredrsvp_form_dataList calendar subscribers
List people subscribed to the account's calendars (personal data: the form answers they gave, such as name and e-mail; calendar app type, sync status). Paged, 20 at most per page. IP address and coordinates are removed. GET /subscribers.
pagestatussort_bypage_sizesort_ordercalendar_idsGet calendar subscriber
One calendar subscriber by id (personal data; IP address and coordinates removed). GET /subscribers/{id}.
subscriber_idrequiredList RSVP forms
The account's RSVP forms (id, name), newest first. Use the id as rsvp_form_id on an event. GET /events/rsvp-forms.
Takes no parameters.
List event landing page templates
The account's event landing page templates (id, name), newest first. Use the id as landing_page_template_id on an event. GET /events/templates.
Takes no parameters.
List calendar templates
The account's calendar landing page templates or embeddable calendar templates (id, name), newest first. Use the id as landing_page_template_id / embeddable_calendar_template_id on a calendar. GET /calendars/templates.
typeList timezones
Timezone names AddEvent supports (use them as the timezone of events and calendars), with current UTC offset. Optional text filter on the name. GET /timezones.
limitsearch100% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
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{ "mcpServers": { "addevent": { "url": "https://addevent.usefulapi.io/mcp" } }}