GoHighLevel

The GoHighLevel integration empowers your Vapi voice agents to directly interact with your clients’ GoHighLevel calendars. Your agents can use a suite of tools to manage the appointment lifecycle: check if a contact already exists using the Get Contact tool, create new leads or clients with the Create Contact tool, query specific GHL calendars for open slots via the Check Availability tool, and secure appointments associated with a contact using the Create Event tool. This enables your voice agent to handle the entire booking process seamlessly within the GHL calendar that your agency or client already uses.

Prerequisites

Before you can use the GoHighLevel integration, you need to:

1. Have a GoHighLevel account.
2. Have a calendar in GoHighLevel to which you have permission to create and edit events.
3. Have access to the Vapi Dashboard.

Setup Steps

1. Connect GoHighLevel Account

First, you need to connect your GoHighLevel account to Vapi:

1. Open the Vapi Dashboard and select Integrations.
2. Under Tool Providers, select GoHighLevel.
3. Select Connect, enter your GoHighLevel API Key, then select Save.

2. Create GoHighLevel Tools

After connecting your GoHighLevel account, create the tools:

1. Select Tools in the Dashboard, then select Create Tool and GoHighLevel.
2. Choose Contact Get, Contact Create, Calendar Check Availability, or Calendar Create Event. Repeat for each tool you need.
3. For each tool, provide a clear and descriptive name. Adding a description is optional. If you leave it blank, Vapi will automatically generate a default description that explains the tool’s purpose and includes the current date, formatted using the timezone you specify in the tool’s metadata.
4. For Calendar Check Availability and Calendar Create Event, provide a valid calendarId. You can find the calendarId in GoHighLevel under Settings and Calendars.

3. Add Tools to Assistant

Now, add your chosen GoHighLevel tool(s) to your assistant. For an example scenario where you want your assistant to book appointments, including finding a suitable time and managing contact information, you would add all four tools: Get Contact, Create Contact, Check Availability, and Create Event.

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

4. Configure Assistant System Prompt

After adding the GoHighLevel tools to your assistant, it’s crucial to provide a clear system prompt. This prompt guides the assistant on how and when to use each tool to achieve the desired workflow. For a typical appointment booking scenario, your system prompt instructs the AI on the sequence of operations and conditions for using each tool.

Here’s an example system prompt to guide your assistant. Remember to replace ghl_contact_get, ghl_contact_create, ghl_check_availability, and ghl_create_event with the exact names you gave your tools if they are different.

You are a helpful and efficient scheduling assistant. Your primary goal is to book appointments for users. Follow these steps carefully:
1.  **Gather Information**: Start by asking for the caller\'s full name and email address.
2.  **Check Existing Contact**: Use the `ghl_contact_get` tool to see if a contact already exists with the provided email.
3.  **Create Contact (if needed)**: If no contact is found, use the `ghl_contact_create` tool to create a new contact with their name and email.
4.  **Discuss Appointment Time**: Once you have a contact ID (either from an existing contact or a newly created one), ask the user for their preferred date and time for the appointment.
5.  **Check Availability**: Use the `ghl_check_availability` tool to check for open slots. It\'s a good idea to check for the entire preferred day to offer alternatives if their initial request isn\'t available.
6.  **Confirm Time**: Discuss the available options with the user and agree on a suitable time.
7.  **Book Appointment**: Finally, use the `ghl_create_event` tool to book the appointment, ensuring you use the correct contact ID.
**Important Guidelines:**
*   Always use `ghl_contact_get` to check for an existing contact *before* attempting to create one with `ghl_contact_create`.
*   You *must* have a contact ID (from `ghl_contact_get` or `ghl_contact_create`) *before* you can book an appointment with `ghl_create_event`.
*   Always confirm availability with `ghl_check_availability` *before* attempting to book an appointment with `ghl_create_event`.

Tool Configurations

GoHighLevel Get Contact Tool

This tool uses both or one of the following fields to retrieve an existing contact:

• email: The email address of the contact to search for.
• phone: The phone number of the contact to search for.

GoHighLevel Create Contact Tool

This tool uses the following fields to create a new contact:

• firstName: The first name of the contact.
• lastName: The last name of the contact.
• email: The email address of the contact.
• phone: The phone number of the contact.

GoHighLevel Check Availability Tool

This tool uses the following fields to check for open appointment slots:

• calendarId: The ID of the GoHighLevel calendar to check.
• startDate: The start of the time range to check for availability (epoch time in milliseconds).
• endDate: The end of the time range to check for availability (epoch time in milliseconds).
• timezone: The timezone for the availability check (e.g., “America/New_York”).

GoHighLevel Create Event Tool

This tool uses the following fields to book an appointment:

• calendarId: The ID of the GoHighLevel calendar in which to create the event.
• contactId: The ID of the GoHighLevel contact to associate with the event.
• title: The title or summary for the calendar event.
• startTime: The start date and time for the event in ISO 8601 format.
• endTime: The end date and time for the event in ISO 8601 format.

Example Usage

Here’s how the tools can be configured in your assistant’s JSON setup:

{
  "model": {
    "provider": "openai",
    "model": "gpt-6-luna",
    "reasoningEffort": "none",
    "messages": [
      {
        "role": "system",
        "content": "You are a highly efficient scheduling assistant for appointments. Your goal is to seamlessly book appointments into a calendar. Follow this precise workflow:\\n\\n1. **Gather User Info**: Start by politely asking for the caller's full name and email address.\\n2. **Check Existing Contact**: Use the 'getGHLContact' tool to check if a contact already exists with the provided email.\\n3. **Create New Contact (if necessary)**: If no contact is found with the email, use the 'createGHLContact' tool to create a new contact. You will need their name and email for this.\\n4. **Determine Appointment Needs**: Once you have a contact ID (either from an existing or newly created contact), ask the user for their preferred date and time for the appointment, and the purpose of the appointment (e.g., 'dental checkup', 'initial consultation').\\n5. **Check Calendar Availability**: Use the 'checkGHLAvailability' tool to find open slots for the requested period. Check a broad enough range (e.g., the entire day) to offer alternatives if the exact preferred time is unavailable.\\n6. **Confirm Time with User**: Discuss the available options and confirm a suitable appointment time with the user.\\n7. **Book the Appointment**: Use the 'createGHLEvent' tool to schedule the appointment. Use the purpose of the appointment as the event title.\\n\\n**Critical Notes:**\\n- Always use 'getGHLContact' before 'createGHLContact'.\\n- You MUST have a contactId before calling 'createGHLEvent'.\\n- Always use 'checkGHLAvailability' before 'createGHLEvent'.\\n- Assume all appointments are 30 minutes long unless specified otherwise by the user.\\n- Today's date is {{\"now\" | date: \"%A, %B %d, %Y, %I:%M %p\", \"America/New_York\"}}."
      }
    ],
    "tools": [
      {
        "type": "gohighlevel.calendar.availability.check",
        "function": {
          "name": "checkGHLAvailability",
          "description": "Use this tool to check for available appointment slots in the GoHighLevel calendar. Today's date is {{\"now\" | date: \"%A, %B %d, %Y, %I:%M %p\", \"America/New_York\"}}."
        },
        "metadata": {
          "calendarId": "CALENDAR_ID",
          "timeZone": "America/New_York"
        }
      },
      {
          "type": "gohighlevel.calendar.event.create",
          "function": {
              "name": "ghl_create_event",
              "description": "Use this tool to create a new appointment (event) in the GoHighLevel calendar. Today's date is {{\"now\" | date: \"%A, %B %d, %Y, %I:%M %p\", \"America/New_York\"}}. - All appointments are 30 minutes long unless specified otherwise by the user."
          },
          "metadata": {
              "calendarId": "CALENDAR_ID"
          }
      },
      {
          "type": "gohighlevel.contact.get",
          "function": {
              "name": "getGHLContact",
              "description": "Use this tool to retrieve an existing contact from GoHighLevel using the user's email address. This helps avoid duplicate entries."
          }
      },
      {
          "type": "gohighlevel.contact.create",
          "function": {
              "name": "createGHLContact",
              "description": "Use this tool to create a new contact in GoHighLevel."
          }
      }
  ]
  }
}

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. Also remember to format {{now}} with your desired timezone.
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
6. Contact Prerequisite for Events: Remember that creating an event in GoHighLevel requires a contactId. Ensure your assistant’s logic always fetches or creates a contact (using the getGHLContact and createGHLContact tools) before attempting to book an appointment with the createGHLEvent tool.