Google Calendar

The Google Calendar integration allows your Vapi assistant to interact with Google Calendar in two ways:

1. Create calendar events through voice commands
2. Check calendar availability for scheduling

This enables your assistant to schedule appointments, meetings, and other calendar events directly during phone calls, as well as check when you’re available for meetings.

Prerequisites

Before you can use the Google Calendar integration, you need to:

1. Have a Google Calendar account
2. Have access to the Vapi Dashboard
3. Have an assistant created in Vapi

Setup Steps

1. Connect Google Calendar Account

First, you need to connect your Google Calendar account to Vapi:

1. Open the Vapi Dashboard and select Integrations.
2. Under Tool Providers, select Google Calendar.
3. Select Connect and complete the Google authorization prompts.

2. Create Calendar Tools

After connecting your Google Calendar account, create the tools:

1. Select Tools in the Dashboard, then select Create Tool and Google Calendar.
2. Choose Create Event or Check Availability. Repeat to create both tools.
3. For each tool, provide a name and description explaining when it should be invoked.

3. Add Tools to Assistant

Now, add your chosen calendar tool(s) to your assistant:

1. Select Assistants in the Dashboard and open your assistant.
2. Open the Tools tab, select Add tool, then choose the calendar tools you want to use.
3. Select Publish, review the changes, select Next, then select Publish to apply the draft.

Tool Configurations

Google Calendar Create Event Tool

This tool uses the following fields to create events:

• summary: The title or description of the calendar event
• startDateTime: The start date and time of the event
• endDateTime: The end date and time of the event
• attendees: A list of email addresses for people to invite to the event
• timeZone: The timezone for the event, defaults to UTC
• calendarId: The calendar ID to create the event in, defaults to the primary calendar

Google Calendar Check Availability Tool

This tool uses the following fields to check availability:

• startDateTime: The start of the time range to check
• endDateTime: The end of the time range to check
• timeZone: The timezone for the availability check, defaults to UTC
• calendarId: The calendar ID to check availability in, defaults to the primary calendar

Example Usage

Here’s how the tools can be used in your assistant’s configuration:

{
  "model": {
    "provider": "openai",
    "model": "gpt-6-luna",
    "reasoningEffort": "none",
    "messages": [
      {
        "role": "system",
        "content": "You are a scheduling assistant. When users want to schedule an appointment, first check their availability using the Check Availability tool, then use the Create Event tool to schedule the event if they're available.\n\n- Gather date and time range to check availability.\n- To book an appointment, gather the purpose of the appointment, ex: general checkup, dental cleaning and etc.\n\nNotes\n- Use the purpose as summary for booking appointment.\n- Current date: {{now}}"
      }
    ],
    "tools": [
      {
        "type": "google.calendar.availability.check",
        "name": "checkAvailability",
        "description": "Use this tool to check calendar availability."
      },
      {
        "type": "google.calendar.event.create",
        "name": "scheduleAppointment",
        "description": "Use this tool to schedule appointments and create calendar events. Notes: - All appointments are 30 mins. \n- Current date/time: {{now}}"
      }
    ]
  }
}

Best Practices

1. Clear Instructions: Provide clear instructions in your assistant’s system message about when to use each calendar tool
2. Error Handling: Include fallback responses for cases where either calendar tool fails
3. Time Zone Awareness: Always specify the correct timezone for events and availability checks
4. Event Details: Ensure all required fields are properly filled when creating events
5. Availability Flow: Check availability before attempting to schedule events to avoid conflicts