Hi, Even though we can see the response coming back from make.com webhook. { "results": [ { "toolCallId": "", "result": { "first_name": "martin", "Client_ID": 39 } } ] } https://cdn.discordapp.com/attachments/1353355013937954848/1353355014084493404/Screenshot_2025-03-23_130052.png?ex=67e15993&is=67e00813&hm=d2ad5e07d0f9a9b65540500f545ebb4fc1e86ffa210f9aadf1663b6c2db155cb&

I notice that the

toolCallId

field in your webhook response is empty. This is likely why your VAPI Agent can't see the response, even though it's visible when tested directly on VAPI. The

toolCallId

is a crucial element that allows VAPI to match a tool's response with the original tool call. Without it, VAPI won't be able to associate the response with the correct tool call. Could you check the initial request from VAPI to make.com and confirm if it includes a

toolCallId

? You'll need to copy this exact ID from the request and include it in your response. Also, I noticed the response format shows nested JSON in the

result

field. Make sure your response follows this exact structure:

json
{
  "results": [
    {
      "toolCallId": "call_XYZ123", // Replace with the actual toolCallId from the request
      "result": {
        "first_name": "martin",
        "Client_ID": 39
      }
    }
  ]
}

Sources: - [Purpose of toolCallId](https://docs.vapi.ai/tools/custom-tools) - [Importance of Matching toolCallId](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1325000684231196775) - [Example of toolCallId in a Response](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1339900285727805513)

My vapi agent can't see the tool data structure, I have to call the agent from phone, testing it using the new test feature does not create this.

Marking this ticket as Solved ✅