Hey everyone, I'm losing my mind a little about tool call responses. I have my assistant call a tool:

# Step-by-step task
## Step 1.
Use the 'check_date_availability' tool with parameter preferred_date = "tomorrow 2pm".
Then, tell the caller what the available time slots are.
`

And, in the VAPI webhook logs I can see that the response I send is in the right format:

{
  "results": [
    {
      "toolCallId": "call_aw5uNgw1CR1DK0Ahu95vqX4T",
      "result": [
        "18:00:00",
        "18:30:00"
      ]
    }
  ]
}

But for some reason, the assistant keeps saying "Oh sorry, I wasn;t able to check the time slots for ..." For context, that tool calls an endpoint on my personal server deployed to railway, and there are http errors being thrown