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ferosai/feros/google-calendar
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version: "1.0.0" name: google_calendar display_name: Google Calendar description: Create, read, or check availability on Google Calendar auth_type: oauth2 category: scheduling

Google Calendar Integration Skill

When to use

When the user wants their voice agent to interact with Google Calendar during a phone call. Common triggers:

  • "book an appointment on my calendar"
  • "check my availability"
  • "schedule a meeting for the caller"
  • "create a calendar event"
  • "look up upcoming appointments"

What to do

  1. Check connection via check_connection("google_calendar").
  1. If not connected: Use secret("google_calendar") in tool scripts.

The system will automatically emit the correct action card (OAuth or manual token) based on the platform configuration. Do NOT emit action cards manually.

  1. Discover calendars (Google Calendar supports auto-discovery):
  • api_call("google_calendar", "GET", "/users/me/calendarList") → list calendars with IDs
  1. Use the real calendar ID. If only one calendar exists, use it.

If multiple, ask the user which one.

  1. If discovery fails, default to "primary" (the user's main calendar).

Example tool configs

Create an event

json
{
  "name": "google_calendar.create_event",
  "description": "Book an appointment on the calendar",
  "params": [
    {"name": "summary", "description": "Title of the event (e.g. 'Consultation with John')", "type": "string", "required": true},
    {"name": "start_datetime", "description": "Start date and time in ISO 8601 format (e.g. '2025-06-15T10:00:00-05:00')", "type": "string", "required": true},
    {"name": "end_datetime", "description": "End date and time in ISO 8601 format (e.g. '2025-06-15T11:00:00-05:00')", "type": "string", "required": true},
    {"name": "description", "description": "Event description or notes from the call", "type": "string", "required": false},
    {"name": "attendee_email", "description": "Email address of the attendee to invite", "type": "string", "required": false}
  ],
  "script": "let key = secret('google_calendar');\nlet body = {summary: summary, start: {dateTime: start_datetime}, end: {dateTime: end_datetime}};\nif (description) body.description = description;\nif (attendee_email) body.attendees = [{email: attendee_email}];\nlet resp = http_post_h('https://www.googleapis.com/calendar/v3/calendars/primary/events', body, {'Authorization': 'Bearer ' + key, 'Content-Type': 'application/json'});\nif (resp.status >= 200 && resp.status < 300) { return 'Appointment booked.'; }\nthrow new Error(`Google Calendar ${resp.status}: ${resp.body}`);",
  "side_effect": true
}

List upcoming events

json
{
  "name": "google_calendar.list_events",
  "description": "Check upcoming appointments on the calendar",
  "params": [
    {"name": "timeMin", "description": "Start of search window in ISO 8601 format", "type": "string", "required": true},
    {"name": "timeMax", "description": "End of search window in ISO 8601 format", "type": "string", "required": true}
  ],
  "script": "let key = secret('google_calendar');\nlet resp = http_get_h('https://www.googleapis.com/calendar/v3/calendars/primary/events?orderBy=startTime&singleEvents=true&maxResults=5&timeMin=' + encodeURIComponent(timeMin) + '&timeMax=' + encodeURIComponent(timeMax), {'Authorization': 'Bearer ' + key});\nif (resp.status >= 200 && resp.status < 300) { return resp.body; }\nthrow new Error(`Google Calendar ${resp.status}: ${resp.body}`);",
  "side_effect": false
}

Check free/busy

json
{
  "name": "google_calendar.check_availability",
  "description": "Check if a time slot is available on the calendar",
  "params": [
    {"name": "timeMin", "description": "Start of availability window in ISO 8601 format", "type": "string", "required": true},
    {"name": "timeMax", "description": "End of availability window in ISO 8601 format", "type": "string", "required": true},
    {"name": "calendar_id", "description": "Calendar ID to check (defaults to primary)", "type": "string", "required": false}
  ],
  "script": "let key = secret('google_calendar');\nlet cal = calendar_id || 'primary';\nlet resp = http_post_h('https://www.googleapis.com/calendar/v3/freeBusy', {timeMin: timeMin, timeMax: timeMax, items: [{id: cal}]}, {'Authorization': 'Bearer ' + key, 'Content-Type': 'application/json'});\nif (resp.status >= 200 && resp.status < 300) { return resp.body; }\nthrow new Error(`Google Calendar ${resp.status}: ${resp.body}`);",
  "side_effect": false
}

Rules

  • NEVER hardcode OAuth tokens or API keys in tool headers
  • NEVER ask for credentials in the chat conversation
  • Always use secret("google_calendar") to reference credentials
  • PREFER using api_call to discover the calendar ID
  • All datetime values must be in ISO 8601 format with timezone offset
  • When creating events, always ask the caller for date, time, and a brief description
  • Default event duration to 30 minutes if the caller doesn't specify
  • Use primary as the default calendar ID unless the user specifies otherwise
  • For script tools, treat non-2xx HTTP responses as failures and throw using resp.status/resp.body instead of returning a plain-text error string
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