Google Calendar MCP
for AI agents

• acl_delete write

  Delete ACL Rule

  Deletes an access control rule from a Google Calendar. Use when you need to remove sharing permissions for a user, group, or domain.

• acl_get read

  Get ACL Rule

  Retrieves a specific access control rule for a calendar. Use when you need to check permissions for a specific user, group, or domain.

• acl_insert write

  Create ACL Rule

  Creates an access control rule for a calendar. Use when you need to grant sharing permissions to a user, group, or domain.

• acl_list read

  List ACL Rules

  Retrieves the list of access control rules (ACLs) for a specified calendar, providing the necessary 'rule_id' values required for updating specific ACL rules.

• acl_patch write

  Patch ACL Rule

  Updates an existing access control rule for a calendar using patch semantics (partial update). This allows modifying specific fields without affecting other properties. IMPORTANT: The ACL rule must already exist on the calendar. This action cannot create new rules. If you receive a 404 Not Found error, the rule does not exist - use ACL insert to create it first, or use ACL list to verify available rules. Each patch request consumes three quota units. For domain-type ACL rules, if PATCH fails with 500 error, this action will automatically fallback to UPDATE method.

• acl_update write

  Update ACL Rule

  Updates an access control rule for the specified calendar.

• acl_watch write

  Watch ACL Changes

  Tool to watch for changes to ACL resources. Use when you need to set up real-time notifications for access control list modifications on a calendar.

• batch_events write

  Batch Events

  Execute up to 1000 event mutations (create/patch/delete) in one Google Calendar HTTP batch request with per-item status/results. Use this to materially reduce round-trips for bulk operations like migrations, cleanup, or large-scale updates.

• calendar_list_delete write

  Remove Calendar from List

  Tool to remove a calendar from the user's calendar list. Use when you need to unsubscribe from or hide a calendar from the user's list.

• calendar_list_get read

  Get Single Calendar by ID

  Retrieves metadata for a SINGLE specific calendar from the user's calendar list by its calendar ID. This action requires a calendarId parameter and returns details about that one calendar only. NOTE: This does NOT list all calendars. To list all calendars in the user's calendar list, use GOOGLECALENDAR_CALENDAR_LIST_LIST instead.

• calendar_list_insert write

  Insert Calendar into List

  Inserts an existing calendar into the user's calendar list, making it visible in the UI. Calendars (e.g., newly created ones) won't appear in the list or UI until explicitly inserted.

• calendar_list_patch write

  Patch Calendar List Entry

  Updates an existing calendar on the user's calendar list using patch semantics. This method allows partial updates, modifying only the specified fields.

• calendar_list_update write

  Update Calendar List Entry

  Updates a calendar list entry's display/subscription settings (color, visibility, reminders, selection) for the authenticated user — does not modify the underlying calendar resource (title, timezone, etc.). To modify the calendar itself, use GOOGLECALENDAR_CALENDARS_UPDATE.

• calendar_list_watch write

  Watch Calendar List

  Watch for changes to CalendarList resources using push notifications. Use this to receive real-time updates when calendar list entries are modified.

• calendars_delete write

  Delete Calendar

  Deletes a secondary calendar that you own or have delete permissions on. Deletion is permanent and irreversible — verify the correct calendar_id before calling. You cannot delete your primary calendar or calendars you only have read/write access to. Use calendarList.list to find calendars with owner accessRole. For primary calendars, use calendars.clear instead. Parallel calls may trigger userRateLimitExceeded; sequence bulk deletions.

• calendars_update write

  Update Calendar

  Full PUT-style update that overwrites all calendar metadata fields; unspecified optional fields are cleared. Use GOOGLECALENDAR_PATCH_CALENDAR to update only a subset of fields. Mutates the underlying calendar resource (title, description, timeZone, etc.); use GOOGLECALENDAR_CALENDAR_LIST_UPDATE to change per-user display properties like color.

• channels_stop write

  Stop Channel

  Tool to stop watching resources through a notification channel. Use when you need to discontinue push notifications for a specific channel subscription.

• clear_calendar write

  Clear Calendar

  Clears a primary calendar by deleting all events from it. The calendar itself is preserved; only its events are removed. Primary calendars cannot be deleted entirely.

• colors_get read

  Get Color Definitions

  Returns the color definitions for calendars and events. Use when you need to retrieve the available color palette for styling calendars or events.

• create_calendar write

  Create a new calendar

  Creates a new secondary Google Calendar with the specified title and optional settings. Use this action when you need to create a new calendar for organizing events separately from the primary calendar. The authenticated user becomes the owner of the newly created calendar. Optional parameters include description, location, and timezone.

• create_event write

  Create Event

  Create a Google Calendar event using start_datetime plus duration fields. The organizer is added as an attendee unless exclude_organizer is True. By default adds Google Meet link (works for Workspace, gracefully falls back for personal Gmail). Attendees can be email strings (required) or objects with email and optional fields. No conflict checking is performed; use GOOGLECALENDAR_FREE_BUSY_QUERY to detect overlaps before creating. Returns event id and htmlLink nested under data.response_data. Example: { "start_datetime": "2025-01-16T13:00:00", "timezone": "America/New_York", "event_duration_hour": 1, "event_duration_minutes": 30, "summary": "Client sync", "attendees": ["required@example.com", {"email": "optional@example.com", "optional": true}] }

• delete_event write

  Delete event

  Deletes a specified event by `event_id` from a Google Calendar (`calendar_id`); idempotent — a 404 for an already-deleted event is a no-op. Bulk deletions may trigger `rateLimitExceeded` or `userRateLimitExceeded`; cap concurrency to 5–10 requests and apply exponential backoff.

• duplicate_calendar write

  Create a calendar

  Creates a new, empty Google Calendar with the specified title (summary). Newly created calendars default to UTC timezone; use GOOGLECALENDAR_PATCH_CALENDAR afterward to set the desired timeZone if needed.

• events_get read

  Get Event

  Retrieves a SINGLE event by its unique event_id (REQUIRED). This action does NOT list or search events - it fetches ONE specific event when you already know its ID. If you want to list events within a time range, search for events, or filter by criteria like time_min/time_max, use GOOGLECALENDAR_EVENTS_LIST instead.

• events_import write

  Import Event

  Tool to import an event as a private copy to a calendar. Use when you need to add an existing event to a calendar using its iCalUID. Only events with eventType='default' can be imported.

• events_instances read

  Get Event Instances

  Returns instances of the specified recurring event. Use timeMin/timeMax to constrain the window; omitting bounds can return large result sets and is quota-heavy. On high-volume calls, 403 rateLimitExceeded or 429 too_many_requests may occur; apply exponential backoff (1s, 2s, 4s) before retrying.

• events_list read

  List Events

  Returns events on the specified calendar. TIMEZONE WARNING: When using timeMin/timeMax with UTC timestamps (ending in 'Z'), the time window is interpreted in UTC regardless of the calendar's timezone. For example, querying '2026-01-19T00:00:00Z' to '2026-01-20T00:00:00Z' on a calendar in America/Los_Angeles (UTC-8) covers 2026-01-18 4pm to 2026-01-19 4pm local time, potentially missing events on the intended local date. To query for a specific local date, use timestamps with the appropriate timezone offset in timeMin/timeMax (e.g., '2026-01-19T00:00:00-08:00' for PST).

• events_list_all_calendars read

  List Events from All Calendars

  Return a unified event list across all calendars in the user's calendar list for a given time range. Use when you need a single view of all events across multiple calendars. An inverted or incorrect time range silently returns empty results rather than an error. An empty `items` list means no events matched the filters—adjust `time_min`, `time_max`, or `q` before concluding no events exist.

• events_move write

  Move Event

  Moves an event to another calendar, i.e., changes an event's organizer.

• events_watch write

  Watch Events

  Watch for changes to Events resources. Watch channels expire; persist the channel `id` per `calendarId` to re-establish watches after expiration or restarts.

• find_event read

  Find event

  Finds events in a specified Google Calendar using text query, time ranges (event start/end, last modification), and event types. Ensure `timeMin` is not chronologically after `timeMax` if both are provided. Results may span multiple pages; always follow `nextPageToken` until absent to avoid silently missing events. Validate the correct match from results by checking summary, start.dateTime, and organizer.email before using event_id for mutations. An empty `items` array means no events matched — widen filters rather than treating it as an error.

• find_free_slots read

  Find free slots

  Finds both free and busy time slots in Google Calendars for specified calendars within a defined time range. If `time_min` is not provided, defaults to the current timestamp in the specified timezone. If `time_max` is not provided, defaults to 23:59:59 of the day specified in `time_min` (if provided), otherwise defaults to 23:59:59 of the current day in the specified timezone. Returns busy intervals and calculates free slots by finding gaps between busy periods; `time_min` must precede `time_max` if both are provided. This action retrieves free and busy time slots for the specified calendars over a given time period. It analyzes the busy intervals from the calendars and provides calculated free slots based on the gaps in the busy periods. Returned free slots are unfiltered by duration; callers must filter intervals to those fully containing the required meeting length. No event metadata (titles, descriptions, links) is returned; use GOOGLECALENDAR_EVENTS_LIST for event details.

• get_calendar read

  Get Google Calendar

  Retrieves a specific Google Calendar, identified by `calendar_id`, to which the authenticated user has access. Response includes `timeZone` (IANA format, e.g., 'America/Los_Angeles') — use it directly when constructing `timeMin`/`timeMax` in other tools to avoid DST errors. An empty `defaultReminders` list is valid (no defaults configured). Insufficient `accessRole` may omit fields like `defaultReminders` and `colorId`.

• get_current_date_time read

  Get current date and time

  Gets the current date and time, allowing for a specific timezone offset. Call this tool first before computing relative dates (e.g., 'tomorrow', 'next Monday') to avoid off-by-one-day errors across timezones.

• list_buildings read

  List Buildings

  Lists all buildings for a Google Workspace customer account with full details including addresses, coordinates, and floor names. Use this action when you need to retrieve the complete list of physical building locations configured in Google Workspace Calendar resources. This is useful for workspace administrators managing conference room and resource scheduling across multiple office buildings. Requires Google Workspace administrator privileges with Directory API access.

• list_calendar_resources read

  List Calendar Resources

  Retrieves calendar resources (such as conference rooms) from a Google Workspace domain using the Admin SDK Directory API. Use this action when you need to list available meeting rooms, conference spaces, or other bookable calendar resources in an organization. The action supports filtering by resource category, capacity, building location, and other criteria. IMPORTANT: This requires Admin SDK Directory API access and appropriate admin permissions - it is NOT available for personal Gmail accounts, only Google Workspace domains.

• list_calendars read

  List Google Calendars

  Retrieves calendars from the user's Google Calendar list, with options for pagination and filtering. Loop through all pages using nextPageToken until absent to avoid missing calendars. Use the primary flag and accessRole field from the response to identify calendars — display names are not valid calendar_id values. Read access (listing) does not imply write OAuth scopes.

• patch_calendar write

  Patch Calendar

  Partially updates (PATCHes) an existing Google Calendar, modifying only the fields provided. At least one of summary, description, location, or timezone must be provided. Empty strings for `description` or `location` clear them.

• patch_event write

  Patch Event

  Update specified fields of an existing event in a Google Calendar using patch semantics (array fields like `attendees` are fully replaced if provided); ensure the `calendar_id` and `event_id` are valid and the user has write access to the calendar.

• quick_add write

  Quick Add Event

  Parses natural language text to quickly create a basic Google Calendar event with its title, date, and time, suitable for simple scheduling; does not support direct attendee addition or recurring events, and `calendar_id` must be valid if not 'primary'.

• remove_attendee write

  Remove attendee from event

  Removes an attendee from a specified event in a Google Calendar; the calendar and event must exist. Concurrent calls on the same event can overwrite attendee lists — apply changes sequentially per event.

• settings_get read

  Get Calendar Setting

  Tool to return a single user setting for the authenticated user. Use when you need to retrieve a specific calendar setting value.

• settings_list read

  List Settings

  Returns all user settings for the authenticated user. Results include multiple settings keyed by id (e.g., `timeZone`); locate a specific setting by its `id` field. `timeZone` values are IANA identifiers (e.g., `America/New_York`) — use directly in datetime and event logic; align with `timeZone` from GOOGLECALENDAR_GET_CALENDAR for consistent notification times.

• settings_watch write

  Watch Settings

  Watch for changes to Settings resources.

• update_event write

  Update Google event

  Updates an existing event in Google Calendar. REQUIRES event_id - you MUST first search for the event using GOOGLECALENDAR_FIND_EVENT or GOOGLECALENDAR_EVENTS_LIST to obtain the event_id. This is a full PUT replacement: omitted fields (including attendees, reminders, recurrence, conferencing) are cleared. Always provide the complete desired event state. Use GOOGLECALENDAR_PATCH_EVENT instead for partial edits.

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