Thanks for reporting this critical issue. To help diagnose the "no result returned" error across your Vapi agents, could you please confirm if you see any specific error messages or details in your Vapi dashboard call logs for these failed tool calls? This will help pinpoint whether the problem is with response formatting, tool configuration, or something else. If possible, please share the exact error message or a screenshot from the call log for one affected call. (You can find call logs by navigating to

Observe > Call Logs

in your [Vapi dashboard](https://dashboard.vapi.ai/).) Once I have this detail, I can guide you through the next troubleshooting steps! Sources: - [Vapi Debugging Documentation](https://docs.vapi.ai/debugging) - [Custom Tools Troubleshooting](https://docs.vapi.ai/tools/custom-tools-troubleshooting)

just saw no result returned

I have the same issue going on right now

@Vapi Support Bot @Vapi What's the solution for it? Its an emmergency situation please help

To resolve the "no result returned" error, ensure your webhook returns HTTP 200 and the following exact JSON structure:

json
{
  "results": [
    {
      "toolCallId": "call_123",
      "result": "Your response as single-line string"
    }
  ]
}

Replace

"call_123"

with the actual toolCallId from the request, and make sure the

"result"

is a single-line string (no line breaks). This should immediately fix the error if the response format was the cause. For more details, see the [Custom Tools Troubleshooting guide](https://docs.vapi.ai/tools/custom-tools-troubleshooting). Source: - [Custom tools troubleshooting](https://docs.vapi.ai/tools/custom-tools-troubleshooting)

Please provide some more details about the issue a well as the chat id.