Yandex Calendar MCP server over CalDAV

Install

Works in

• SourceCraft
• Koda
• Coddy

Services

• Yandex 360

Manual install

pip install -r requirements.txt

What it does

The server gives an agent read and write access to Yandex Calendar over the CalDAV protocol. It reads events for a period up to 92 days across all calendars or one, expands recurring events into concrete dates, marks attendees with their reply status, and names the time zone explicitly in every response. For writes it creates one-off and recurring events, moves and renames them, edits a single day of a series via RECURRENCE-ID or the whole series, invites and removes attendees, and replies to invitations from others. Every write is verified by reading it back from the server, and if Yandex silently failed to apply a change, the server honestly reports failure instead of a false success. Before every delete and update, a full copy of the event is saved to YANDEX_TRASH_DIR as an ics file, and deletion additionally checks the event's title against the passed id to avoid erasing the wrong one. Adding or removing an attendee sends a real invitation or cancellation email through Yandex, which cannot be recalled.

Who it is for. For people who keep their schedule in Yandex Calendar and want to manage events and invitations from an agent chat.

Example request

Move the team meeting to Friday at 3pm and add the new hire to the attendees

MCP

Transport

stdio

Authentication

API key

Limitations

You need a Yandex app password for CalDAV; a regular account password does not work. It needs Python 3.10 and the tzdata package, since slim Linux images often ship without a time zone database. Invitations and cancellations are sent as real emails and cannot be recalled. Deleting or editing someone else's event as if you were the organizer is impossible: Yandex silently rejects such edits, and the server detects this and refuses upfront.

How to disable. Remove the yandex-calendar entry from your MCP client configuration.

README in short

The README details read and write capabilities, a table of six tools, three layers of delete protection, a title check, a trash with ics copies, and a mandatory choice between one day of a series and the whole series, separately explains why you cannot edit someone else's event as its organizer, and honestly warns that invitations are sent as real, unrecallable emails.