I added this to my transient api call for a single outbound call and got the error above: "tools": [ { "type": "transferCall", "destinations": [ { "type": "number", "number": "+145636436245345, "description": "ALEX", "transferPlan": { "mode": "warm-transfer-with-summary", "summaryPlan": { "enabled": true, "messages": [ { "role": "system", "content": "Provide a concise call summary for the human receiving the transfer." }, { "role": "user", "content": "Transcript so far:\n\n{{transcript}}\n\n" } ] } } } ] } ]

Your error is likely due to unsupported fields ("transferPlan" and "summaryPlan") in your

tools

array. Try using the following format for your

transferCall

tool:

json
"tools": [
  {
    "type": "transferCall",
    "destinations": [
      {
        "type": "number",
        "number": "+145636436245345",
        "message": "I am forwarding your call to ALEX. Please stay on the line."
      }
    ]
  }
]

Remove the

transferPlan

and

summaryPlan

fields, as they are not part of the supported schema for

transferCall

destinations. [See the documentation example here.](https://docs.vapi.ai/tools/default-tools#transfer-call) Source: - [Default Tools Transfer Call](https://docs.vapi.ai/tools/default-tools#transfer-call)