In https://docs.vapi.ai/api-reference/calls/create?explorer=true Setting up a custom web hook, and when I select agentOverrides, and then variableValues, there's no drop-down for adding items, what's the point of being able to select variable values if you can't add them? https://cdn.discordapp.com/attachments/1433184563823382658/1433184570609500292/Screenshot_2025-10-29_at_2.02.32_PM.png?ex=6903c4a4&is=69027324&hm=6e828914ac0ef0d9a0afd917cffa41cb80ab6e065cc699672012bad5150ba7d3&

You won't see a dropdown for

variableValues

because it's meant to be a flexible object where you manually add your own key-value pairs. Just enter your variables as JSON like this:

json
{
  "assistantOverrides": {
    "variableValues": {
      "customerName": "John Doe",
      "accountType": "Premium"
    }
  }
}

Use the "Use example" button to see the structure, then edit the values as needed. For more, see the [Personalization documentation](https://docs.vapi.ai/assistants/personalization). Source: - [Personalization with user information](https://docs.vapi.ai/assistants/personalization)

Hi Pulse, Thank you for flagging this! We'll pass this feedback along to our product team so they can improve the UI experience around configuring

variableValues

in the future. In the meantime, as a workaround, you can use Postman, PowerShell, or another API testing tool to configure these values directly via the API — this will let you add and test your custom variables more easily. Appreciate you taking the time to share this with us! Best, Kyle at Vapi