I'm experiencing an issue where the server message type tool-calls is not triggering as expected. In the webhook logs, I did not see the Tool Calls Type between 6:55 PM - 6:58 PM. In the call logs messages menu, I did not see the role tool_calls message. Can you please help me why did these happen? Here are the details: Call ID: 7e672b90-fdc7-47bb-9983-a7a9a4e0f03b When: 1746125847170 Expect response: server message tool-calls Received response: none https://cdn.discordapp.com/attachments/1367582438703759470/1367582439337361428/image.png?ex=68151be5&is=6813ca65&hm=c525bfcdef3b7641bbe52c219cc293be347402c3dd19961cdb31a7fa5f879995&

Check your server URL configuration in the Vapi Dashboard to ensure it's correctly set up to receive the tool-calls event. Verify that:

1. The tool is set to `synchronous` not `async`
2. The "request-start" message is set to an empty string
3. Your webhook endpoint is properly handling POST requests

If the issue persists, examine your server logs for errors and consider using a tool like Postman to test your webhook endpoint directly. Sources: - [Discord Channel](https://discord.com/channels/1211482211119796234/1334054297339433022) - [Discord Channel](https://discord.com/channels/1211482211119796234/1342315282198298729) - [Discord Channel](https://discord.com/channels/1211482211119796234/1333858668730515689)

@Vapi Support Bot Tested the webhook using insomnia and it's working. Request Log from the server:

type: tool-calls
tool triggered
[
  {
    id: 'toolu_01DTPAzUm5Gk3zxrpJ969oMF',
    type: 'function',
    function: {
      name: 'caller_details',
      arguments: { firstName: 'Vapi', lastName: 'Test', phoneNumber: '111111' }
    }
  }
]
{ "result": "It looks like we do not have your information. Proceed to ask their email." }

But when I tried to use the call assistant from vapi dashboard. The tool-call message is still not requesting to the server.

Try using the webhook directly instead of the Vapi module to respond to tool calls. According to similar reported issues, this approach has resolved the problem:

javascript
// In your webhook handler
app.post('/webhook', (req, res) => {
  // Extract toolCallId from the request
  const toolCallId = req.body.toolCalls[0].id;
  
  // Send response directly with the correct toolCallId
  res.json({
    toolCallId: toolCallId,
    result: "Your result here"
  });
});

This solution has worked for others experiencing the same issue where tool-calls work with Insomnia but not with the call assistant. Source: - [Discord Channel](https://discord.com/channels/1211482211119796234/1334661059298066514)

Still no tool-call webhook logs. By the way I used custom-llm

The

tool-calls

message likely didn’t trigger due to assistant configuration, webhook setup, or misformatted responses, check prompts, webhook handling, and integration logs to troubleshoot.