What I'm trying now is using this: https://docs.vapi.ai/api-reference/tools/create?explorer=true to create a tool with the following. My assistant prompt tells them to use the named tool to transfer the qualified call. When it connects, it does not do the warm transfer, just a straight transfer. Here is the tool I created with OMITTED used for sensitive info.

{
  "id": "OMITTED",
  "createdAt": "2025-05-23T14:46:01.036Z",
  "updatedAt": "2025-05-23T14:46:01.036Z",
  "type": "transferCall",
  "orgId": "OMITTED",
  "server": {},
  "async": false,
  "destinations": [
    {
      "type": "number",
      "number": "+OMITTED",
      "description": "OMITTED",
      "transferPlan": {
        "mode": "warm-transfer-say-summary",
        "message": "Connecting you with {{contact.first_name}}. OMITTED. Please hold while I connect you.",
        "sipVerb": "refer"
      },
      "numberE164CheckEnabled": true
    }
  ]
}