I have two agents leasing and maintenance and one dynamic transfer tool (no destinations) with webhook setup to get the destinations from our backend. The webhook is working fine, but I am unable to get the name of the agent the tool is transferring to in the "argument" param.

To include the agent's name in the transfer tool's arguments, ensure your webhook response adds a custom field (e.g.,

agentName

) to the destination object. For example:

json
{
  "destination": {
    "type": "assistant",
    "assistantName": "LeasingAgent",
    "description": "Leasing department agent",
    "agentName": "LeasingAgent"
  }
}

Your assistant or downstream logic can then extract

agentName

from the destination object. Adjust your webhook to include this field as needed for your use case. Reference: See [Dynamic call transfers - webhook response example](https://docs.vapi.ai/calls/call-dynamic-transfers#build-your-webhook-server). Source: - [Dynamic call transfers](https://docs.vapi.ai/calls/call-dynamic-transfers#build-your-webhook-server)

I can help you fix that. It seems your webhook works fine, but the agent name isn’t being passed in the argument field. Could you share how your backend returns the destination data? That’ll help me see where the mapping might be missing. @Toph

Hi Toph, To implement a dynamic call transfer using Vapi, ensure the following steps are followed: 1. **Create a Dynamic Transfer Tool**:Leave the

destinations

array empty, and specify the tool type as

transferCall

. Here's a basic structure:

json
   { 
     "type": "transferCall", 
     "destinations": [], 
     "function": {
       "name": "dynamicTransfer",
       "description": "Transfer call to appropriate destination based on customer needs",
       "parameters": {
         "type": "object",
         "properties": {
           "reason": {"type": "string", "description": "Reason for transfer"},
           "urgency": {"type": "string", "enum": ["low", "medium", "high", "critical"]}
         }
       }
     }
   }

2. **Webhook Setup**:Use a

transfer-destination-request

webhook to dynamically determine the transfer destination. Make sure your server logic correctly interprets the context from the webhook and responds with the appropriate destination. 3. **Assistant Configuration**:Integrate your dynamic transfer tool into an assistant configuration, enabling the transfer-destination-request server event to activate dynamic routing. 4. **Testing**:Assign the created assistant with the dynamic transfer tool to a phone number. Test various transfer scenarios and monitor the webhook server logs to verify the routing decisions are being made correctly. For complete procedural steps, you can refer to the [Dynamic Transfers](https://docs.vapi.ai/calls/call-dynamic-transfers) documentation.

Issue is the transfer-destination-request don't get trigger when something passed to argument like

{
"role": "tool_calls",
"time": 1760507944804,
"message": "",
"toolCalls": [
"0": {
"id": "call_ss4HeJAoN0XPqv1UiGUemtUK",
"type": "function",
"function": {
"name": "transfer_call_tool",
"arguments": "{\"target\": \"maintenance agent\"}"
}
}
],
"secondsFromStart": 5.524
}

{
"name": "transfer_call_tool",
"role": "tool_call_result",
"time": 1760507944809,
"result": "Transfer initiated.",
"toolCallId": "call_ss4HeJAoN0XPqv1UiGUemtUK",
"secondsFromStart": 5.529
}

https://cdn.discordapp.com/attachments/1427326515502383104/1427899555424370769/image.png?ex=68f08a97&is=68ef3917&hm=16e4f0c94b3bd2be6b3d4345a5128b7edb9e3a2227a000800506878b17b73fa0&

Hey there, we reviewed the details of your request and brought this to our team's attention. We will be getting back to you as soon as we can. Thank you for your continued patience!