Can I make local tool calls with the vapi web sdk?
# supportd
DamienM
08/13/2025, 2:53 PMNot seeing any docs for local tool calls
eg the agent sends a message to the web sdk to tell the browser to call a tool and what params to use
Example
{
"tool_call": {
"name": "do_something",
"params": {
"key": "value"
}
}
}
then the client makes the tool call and returns a result to the agent
{
"tool_call_result": {
"name": "do_something",
"result": {
"success": "true"
}
}
}
DamienM
08/13/2025, 3:41 PMI setup the server based tool calls and I can use the client side message to trigger the tool which is weird
can I just use client side tool calls without a server?
Copy code
{
"type": "tool-calls",
"toolCalls": [
{
"id": "call_e5UMNx9R0HazLoe5uvmOOvxk",
"type": "function",
"function": {
"name": "next_question",
"arguments": {
"ready": true
}
}
}
],
"toolCallList": [
{
"id": "call_e5UMNx9R0HazLoe5uvmOOvxk",
"type": "function",
"function": {
"name": "next_question",
"arguments": {
"ready": true
}
}
}
],
"toolWithToolCallList": [
{
"type": "function",
"function": {
"name": "next_question",
"parameters": {
"type": "object",
"required": [
"ready"
],
"properties": {
"ready": {
"type": "boolean",
"description": "Whether to proceed to next question"
}
}
},
"description": "Move to the next question in the interview after saving an answer"
},
"server": {},
"messages": [],
"toolCall": {
"id": "call_e5UMNx9R0HazLoe5uvmOOvxk",
"type": "function",
"function": {
"name": "next_question",
"arguments": {
"ready": true
}
}
}
}
]
}DamienM
08/13/2025, 3:58 PMif I remove the server part of the tool it stops working locally
if I add it back with a fake url I can get it working client side tho
Copy code
"tools":[
{
"type":"function",
"function":{
"name":"save_answer",
"description":"Save the user\\'s answer to the current interview question",
"parameters":{
"type":"object",
"properties":{
"question":{
"type":"string",
"description":"The question that was asked"
},
"answer":{
"type":"string",
"description":"The complete answer from the user"
},
"category":{
"type":"string",
"description":"The category of the question (e.g., Core Identity, Values, etc.)"
}
},
"required":[
"question",
"answer",
"category"
]
},
"server":{
"url":"https://example.com/not-used",
"secret":"not-used"
}
}
},c
Chiranjeet Mishra
08/15/2025, 10:30 AMHey DamienM, if the local tool calls are working with a fake serverUrl can you confirm that and do you still require additional support for this issue?
d
DamienM
08/19/2025, 3:12 PMWondering if there is a way to get it working without the need for the fake server url
I think it adds latency to the bot because it keeps saying "hold on a second" etc
c
Chiranjeet Mishra
08/21/2025, 6:27 AMThere might be a timeout property that you could set really short so that it just closes the request sooner and proceeds with the rest of the prompt. Try adding the
timeout4 Views