Hi this is urgent !!! I a unable to get arguments in server url body when a tool call is initiated. Refer this call ID '0199e444-ffde-7aa9-96ff-7451239af94d'. At aroung 4:53 it initiated tool call to send email and it failed, when i checked i found that no arguments came in the server url. Please check this asap.

It sounds like your tool's parameters may not be defined correctly, which can cause arguments to be missing in the server URL body. Make sure your tool configuration includes a

parameters

section like this:

json
"parameters": {
  "type": "object",
  "properties": {
    "emailAddress": { "type": "string", "description": "Recipient's email" },
    "message": { "type": "string", "description": "Email content" }
  },
  "required": ["emailAddress", "message"]
}

Update your tool's parameters and test again—this should ensure arguments are sent in the tool call payload. [See more in the Vapi documentation](https://docs.vapi.ai/server-url/events) Sources: - [Server events](https://docs.vapi.ai/server-url/events) - [Debugging](https://docs.vapi.ai/debugging)

Hi @Vapi team pls check asap

Thank you for the call id. We are reviewing the details of your request and will reach out to you when we have an update or if we need additional information.

can i expect a response soon as this is reported by customers and we need to answer them soon

We noticed you are using GPT-4.1-mini as the LLM, which may produce inaccurate results. Please switch the model to GPT-4.1 or GPT-4o to check if arguments are sent with the tool call

i tried using 4o and it threw the same issue refer callid id : 019a0698-5c7f-733e-8322-0921e5d158ae around 3:58 it made tool call and it failed the reason is same no arguments came in the tool call payload. Please ask it to developer team and get confirmed is it something i need to turn off any parsing or something on my end, let me know whatever i need to do on my side but i am in urgency need to address the clients

Hi Sahil, Apologies for the delay here — and thank you for your patience. We’ve reopened your ticket and reviewed the logs for the call ID you shared. We can confirm that the arguments were correctly passed into the LLM, but were not forwarded to your tool call, which explains why the request body was empty on your end. We’ve now notified our engineering team to investigate this behavior further. We’ll follow up as soon as we have an update or need additional details from you. Thank you again for flagging this and bearing with us.

I hope it gets fixed before next year 🙂

Could you try testing a call with your tool with your parameters? There have been some updates to the platform and I just want to confirm if this issue is still present.