VAPI•7mo ago

how to use api_tool result in following node.

I used an api_tool.
In the log i am seeing the following result

{
"name": "get_events_vapi",
"role": "tool_call_result",
"time": 1749668533604,
"result": "{"option_request_id": "recx350X6P2CCTCO9"}",
"toolCallId": "b09ad572",
"secondsFromStart": 34.805
}

However when i use option_request_id in the next node which is an api_tool node

Name
option_request_id
Type
String
Value
{{option_request_id}}

it shows in my call log it is empty

{
"role": "tool_calls",
"time": 1749668537173,
"message": "",
"toolCalls": [
{
"id": "db2de25b",
"type": "function",
"function": {
"name": "Check_options",
"arguments": "{"option_request_id": ""}"
}
}
],
"secondsFromStart": 38.374
}

Am i doing something wrong?

@Kings_big

VapiAPP•6/12/25, 2:51 AM

Hey! To help track down this issue, could you share:

The call ID
When exactly this happened (the timestamp)
What response you expected to get
What response you actually got instead
This would really help us figure out what went wrong!

popular-magentaOP•6/12/25, 9:55 AM

hi thanks for your response

I tried something else but got th same issue. I thought i wasn't able to reuse the response data because i used a post request, so i tried again with a get request, but i got the same issue.

The data i am getting from my server, isn't used in subsequent api_tool (post request)

Call_id
7c3fdace-e228-48e4-b6ef-48a28597f0ce

Fetching "option_request_id" with GET request

{
"role": "tool_calls",
"time": 1749721512571,
"message": "",
"toolCalls": [
{
"id": "f074d5a3",
"type": "function",
"function": {
"name": "Get_option_request_id",
"arguments": "{}"
}
}
],
"secondsFromStart": 23.964
}

Information fetched successfully

{
"name": "Get_option_request_id",
"role": "tool_call_result",
"time": 1749721512888,
"result": "{"option_request_id": "recNA8OiTGqm8nNxd"}",
"toolCallId": "f074d5a3",
"secondsFromStart": 24.281
}

I then use a POST request (via api_tool) to activate a function, but my server needs the "option_request_id"

So i do

Request body of my api tool
Name
option_request_id

Type
string

Value
{{option_request_id}}

MESSAGES in call log
{
"role": "tool_calls",
"time": 1749721522129,
"message": "",
"toolCalls": [
{
"id": "370315a8",
"type": "function",
"function": {
"name": "Check_options",
"arguments": "{"option_request_id": ""}"
}
}
],
"secondsFromStart": 33.522
}

ISSUE: "option_request_id" is empty
"arguments": "{"option_request_id": ""}"

and my server returns an error

---------

It seems that response variables aren't saved in dynamic variables

@Shubham Bajaj

popular-magentaOP•6/12/25, 9:59 AM

Call id
39735a87-203b-4808-ba0a-8a7a22f505ca

This is an example of trying to use the resspone of POST request = 'option_request_id'

And using it in a subsequent POST request, but it fails to populate the 'option_request_id' in the arguments

1st post and result
{
"role": "tool_calls",
"time": 1749669826730,
"message": "",
"toolCalls": [
{
"id": "818d8956",
"type": "function",
"function": {
"name": "get_events_vapi",
"arguments": "{\n "lead_id": "recMFOShg13366Zki",\n "language_id": "recvr7LEEosjFtclE",\n "option_request_id": ""\n}"
}
}
],
"secondsFromStart": 31.027
}
{
"name": "get_events_vapi",
"role": "tool_call_result",
"time": 1749669835831,
"result": "{"option_request_id": "recBZVOpg2C6464Mg"}",
"toolCallId": "818d8956",
"secondsFromStart": 40.128
}

2ND POST and result (fail to populate)

{
"role": "tool_calls",
"time": 1749669838627,
"message": "",
"toolCalls": [
{
"id": "582e12b2",
"type": "function",
"function": {
"name": "Check_options",
"arguments": "{"option_request_id": ""}"
}
}
],
"secondsFromStart": 42.924
}

ERROR result from my server

{
"name": "Check_options",
"role": "tool_call_result",
"time": 1749669841188,
"result": "[\n {\n "error_code": 400,\n "error_field": null,\n "error_kind": "validation",\n "error_message": "Missing option_request_id in request body",\n "error_type": "ValidationError",\n "request_data": "{\"option_request_id\": \"\"}",\n "request_headers": "{\"Content-

VapiAPP•6/13/25, 1:55 AM

Hey Swek, checking if this was resolved after the Discord office hours.

popular-magentaOP•6/14/25, 10:46 AM

hi thanks for getting back to me.

I retried my flow, still have the same issue

1) Result of GET, it fetches the option_request_id correctly

{
"name": "Get_option_request_id",
"role": "tool_call_result",
"time": 1749897741100,
"result": "{"option_request_id": "recPZlenc4hUn8TC6"}",
"toolCallId": "4e0cf52b",
"secondsFromStart": 39.631
}

2) try to do a post request afterwards with the option_request_id, but doesn't populate

{
"role": "tool_calls",
"time": 1749897750215,
"message": "",
"toolCalls": [
{
"id": "8e501b9d",
"type": "function",
"function": {
"name": "Check_options",
"arguments": "{"option_request_id": ""}"
}
}
],
"secondsFromStart": 48.746
}

dangerous-fuchsia•6/17/25, 12:35 AM

@Kings_big

Can you please help him and resolve his issue? Thanks!

extreme-purple•6/17/25, 9:04 AM

Your option_request_id isn’t being passed correctly in the POST request, ensure it's properly extracted from the GET response, not overwritten before sending, and included in a correctly formatted JSON body with the right headers (Content-Type: application/json)..

how to use api_tool result in following node.

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