Agent skill

google-calendar

Google Calendar API for scheduling. Use when user mentions "calendar", "calendar.google.com", shares a calendar link, "schedule meeting", "check availability", or "when am I free".

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Install this agent skill to your Project

npx add-skill https://github.com/vm0-ai/vm0-skills/tree/main/google-calendar

SKILL.md

Google Calendar API

Manage calendars and events via Google's Calendar REST API.

Official docs: https://developers.google.com/workspace/calendar/api/v3/reference

When to Use

Use this skill when you need to:

  • List and manage calendars
  • Create, update, and delete calendar events
  • Search and filter events by time range
  • Manage event attendees and send invitations
  • Set up event reminders
  • Check free/busy availability
  • Handle recurring events
  • Quick-add events using natural language

Placeholders: Values in {curly-braces} like {event-id} are placeholders. Replace them with actual values when executing.

How to Use

Base URL: https://www.googleapis.com/calendar/v3

Calendar List

List All Calendars

Get all calendars the user has access to:

bash
curl -s "https://www.googleapis.com/calendar/v3/users/me/calendarList" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.items[]? | {id, summary, primary, accessRole}'

Get Calendar Details

Get metadata for a specific calendar:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/{calendar-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '{id, summary, description, timeZone}'

For primary calendar, use primary as the calendar ID:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/primary" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '{id, summary, description, timeZone}'

Events

List Events

List upcoming events from the primary calendar:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/primary/events?maxResults=10&orderBy=startTime&singleEvents=true&timeMin=$(date -u +%Y-%m-%dT%H:%M:%SZ)" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.items[]? | {id, summary, start, end}'

List Events with Time Filter

Get events within a specific date range:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/primary/events?timeMin=2024-01-01T00:00:00Z&timeMax=2024-12-31T23:59:59Z&singleEvents=true&orderBy=startTime" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.items[]? | {id, summary, start, end}'

Search Events

Search events by query string:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/primary/events?q=meeting&singleEvents=true" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.items[]? | {id, summary, start, end}'

Get Event Details

Get full details for a specific event:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.'

Create Event

Create a new event. Write to /tmp/calendar_request.json:

json
{
  "summary": "Team Meeting",
  "description": "Weekly sync-up meeting",
  "location": "Conference Room A",
  "start": {
    "dateTime": "2024-03-15T10:00:00",
    "timeZone": "America/New_York"
  },
  "end": {
    "dateTime": "2024-03-15T11:00:00",
    "timeZone": "America/New_York"
  },
  "attendees": [
    {
      "email": "colleague@example.com"
    }
  ],
  "reminders": {
    "useDefault": false,
    "overrides": [
      {
        "method": "email",
        "minutes": 30
      },
      {
        "method": "popup",
        "minutes": 10
      }
    ]
  }
}

Then run:

bash
curl -s -X POST "https://www.googleapis.com/calendar/v3/calendars/primary/events" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, htmlLink}'

Create All-Day Event

Write to /tmp/calendar_request.json:

json
{
  "summary": "Company Holiday",
  "start": {
    "date": "2024-07-04"
  },
  "end": {
    "date": "2024-07-05"
  }
}

Then run:

bash
curl -s -X POST "https://www.googleapis.com/calendar/v3/calendars/primary/events" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, htmlLink}'

Quick Add Event

Create event from natural language text:

bash
curl -s -X POST "https://www.googleapis.com/calendar/v3/calendars/primary/events/quickAdd?text=Lunch%20with%20Sarah%20tomorrow%20at%2012pm" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.error // {id, summary, start, end}'

Update Event

Update an existing event. Write to /tmp/calendar_request.json:

json
{
  "summary": "Updated Team Meeting",
  "description": "Updated description",
  "start": {
    "dateTime": "2024-03-15T14:00:00",
    "timeZone": "America/New_York"
  },
  "end": {
    "dateTime": "2024-03-15T15:00:00",
    "timeZone": "America/New_York"
  }
}

Then run:

bash
curl -s -X PUT "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, updated}'

Patch Event

Partially update an event (only specified fields). Write to /tmp/calendar_request.json:

json
{
  "summary": "Updated Title Only"
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, updated}'

Delete Event

Delete an event:

bash
curl -s -X DELETE "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)"

Send deletion notifications to attendees:

bash
curl -s -X DELETE "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}?sendUpdates=all" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)"

Attendees

Set Attendees on Event

Note: PATCH replaces the entire attendees array — always include all intended attendees in the list, not just the ones you're adding.

Write the full attendees list to /tmp/calendar_request.json:

json
{
  "attendees": [
    {
      "email": "attendee1@example.com",
      "optional": false
    },
    {
      "email": "attendee2@example.com",
      "optional": true
    }
  ]
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}?sendUpdates=all" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, attendees}'

Remove Attendee from Event

Patch the event with the updated attendees list (omit the attendee you want to remove). Write to /tmp/calendar_request.json:

json
{
  "attendees": [
    {
      "email": "remaining@example.com"
    }
  ]
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}?sendUpdates=all" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, attendees}'

Reminders

Set Custom Reminders

Update event with custom reminders. Write to /tmp/calendar_request.json:

json
{
  "reminders": {
    "useDefault": false,
    "overrides": [
      {
        "method": "email",
        "minutes": 1440
      },
      {
        "method": "popup",
        "minutes": 30
      }
    ]
  }
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, reminders}'

Use Default Reminders

Write to /tmp/calendar_request.json:

json
{
  "reminders": {
    "useDefault": true
  }
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, reminders}'

Recurring Events

Create Recurring Event

Create an event with recurrence rule. Write to /tmp/calendar_request.json:

json
{
  "summary": "Weekly Team Standup",
  "start": {
    "dateTime": "2024-03-15T09:00:00",
    "timeZone": "America/New_York"
  },
  "end": {
    "dateTime": "2024-03-15T09:30:00",
    "timeZone": "America/New_York"
  },
  "recurrence": [
    "RRULE:FREQ=WEEKLY;BYDAY=MO,WE,FR;COUNT=20"
  ]
}

Then run:

bash
curl -s -X POST "https://www.googleapis.com/calendar/v3/calendars/primary/events" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, recurrence, htmlLink}'

Common recurrence patterns:

  • Daily: RRULE:FREQ=DAILY
  • Weekly on specific days: RRULE:FREQ=WEEKLY;BYDAY=MO,WE,FR
  • Monthly on same day: RRULE:FREQ=MONTHLY;BYMONTHDAY=15
  • Until specific date: RRULE:FREQ=WEEKLY;UNTIL=20241231T235959Z
  • Limited occurrences: RRULE:FREQ=DAILY;COUNT=10

List Recurring Event Instances

Get all instances of a recurring event:

bash
curl -s "https://www.googleapis.com/calendar/v3/calendars/primary/events/{recurring-event-id}/instances?timeMin=2024-01-01T00:00:00Z&timeMax=2024-12-31T23:59:59Z" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" | jq '.items[]? | {id, summary, start, end, recurringEventId}'

Free/Busy Information

Query Free/Busy

Check availability for one or more calendars. Write to /tmp/calendar_request.json:

json
{
  "timeMin": "2024-03-15T00:00:00Z",
  "timeMax": "2024-03-15T23:59:59Z",
  "items": [
    {
      "id": "primary"
    },
    {
      "id": "colleague@example.com"
    }
  ]
}

Then run:

bash
curl -s -X POST "https://www.googleapis.com/calendar/v3/freeBusy" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // .calendars'

Secondary Calendars

Create Secondary Calendar

Write to /tmp/calendar_request.json:

json
{
  "summary": "Project Alpha Calendar",
  "description": "Calendar for Project Alpha events",
  "timeZone": "America/New_York"
}

Then run:

bash
curl -s -X POST "https://www.googleapis.com/calendar/v3/calendars" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, description}'

Update Calendar Properties

Write to /tmp/calendar_request.json:

json
{
  "summary": "Updated Calendar Name",
  "description": "Updated description"
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/{calendar-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, description}'

Delete Secondary Calendar

bash
curl -s -X DELETE "https://www.googleapis.com/calendar/v3/calendars/{calendar-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)"

Event Colors

Set Event Color

Update event color using colorId (1-11). Write to /tmp/calendar_request.json:

json
{
  "colorId": "5"
}

Then run:

bash
curl -s -X PATCH "https://www.googleapis.com/calendar/v3/calendars/primary/events/{event-id}" --header "Authorization: Bearer $(printenv GOOGLE_CALENDAR_TOKEN)" --header "Content-Type: application/json" -d @/tmp/calendar_request.json | jq '.error // {id, summary, colorId}'

Available color IDs:

  • 1: Lavender
  • 2: Sage
  • 3: Grape
  • 4: Flamingo
  • 5: Banana
  • 6: Tangerine
  • 7: Peacock
  • 8: Graphite
  • 9: Blueberry
  • 10: Basil
  • 11: Tomato

Common Query Parameters

Parameter Type Purpose
timeMin datetime Lower bound for event end time (RFC3339)
timeMax datetime Upper bound for event start time (RFC3339)
maxResults integer Max events per page (default 250, max 2500)
orderBy string Sort by startTime or updated
singleEvents boolean Expand recurring events into instances
q string Free text search query
sendUpdates string Send notifications: all, externalOnly, none

Guidelines

  1. Primary Calendar: Use primary as the calendar ID for the user's primary calendar
  2. Date Format: Use RFC3339 format for dates (2024-03-15T10:00:00Z or with timezone 2024-03-15T10:00:00-04:00)
  3. All-Day Events: Use date field instead of dateTime for all-day events
  4. Notifications: Use sendUpdates parameter to control whether attendees receive email notifications
  5. Patch vs Update: Use PATCH for partial updates (more efficient), PUT for full replacement. Note: PATCH on attendees replaces the entire array — always include all intended attendees
  6. Time Zones: Always specify time zones explicitly to avoid ambiguity
  7. Recurring Events: To modify all instances, update the recurring event master; to modify single instance, update the specific instance ID

API Reference

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