Possible to send a tool response from the client?
# supportt
Tafting
05/27/2025, 1:01 AMI use the response stream to detect when a tool is called and take action on the client side.
I'd also like to be able to send the tool's response from the client, but I can't do it.
The most I've succeeded in doing is this, but it's impossible to give it the toolCallId, and the name somewhere so that it uses it properly because the voice assistant keeps saying that it hasn't managed to retrieve the information.
Messages from vapi dashboard :
Copy code
{
"role": "tool_call_result",
"time": 1748306984938,
"result": "Here is the result of the tool call: {\"template\":\"bold\",\"fontFamily\":\"Montserrat\",\"fontWeight\":\"800\",\"fontSize\":60,\"color\":\"#ffffff\",\"isItalic\":false,\"isPunctuation\":true,\"isUppercase\":true,\"mode\":\"twoLines\",\"position\":50,\"animation\":{\"appear\":\"bounce\"},\"activeWord\":{\"isActive\":true,\"fontFamily\":\"Montserrat\",\"fontWeight\":\"800\",\"fontSize\":62,\"color\":\"#bbbbbb\",\"isItalic\":false,\"isPunctuation\":true,\"isUppercase\":true},\"shadow\":{\"isActive\":true,\"size\":3,\"color\":\"#000000\"}}",
"secondsFromStart": 13.552
}
{
"name": "getCurrentSubtitleStyle",
"role": "tool_call_result",
"time": 1748306985490,
"result": "No result returned.",
"toolCallId": "call_wQxdakrO15NNScvqwngijnCu",
"secondsFromStart": 10.06
}
` Copy code
if (message.type === "tool-calls" && props?.onToolCall && Array.isArray(message.toolCalls)) {
message.toolCalls.forEach(async (toolCall: any) => {
const result = await props.onToolCall?.(toolCall);
if (vapiInstance) {
vapiInstance.send({
type: "add-message",
message: {
role: "tool",
content: "Here is the result of the tool call: " + result
}
});
}
});
}k
Kings_big💫
05/27/2025, 6:53 AMUse the role: "tool_call_result" and include both toolCallId and name in the message, so the assistant can correctly match the response to the original tool call.
v
Vapi Support Bot
05/27/2025, 6:54 AMCurrently, Vapi only supports sending tool responses from the server side, not directly from the client. To properly resolve a tool call, your server should respond with a JSON object like this:
Copy code
json
{
"results": [
{
"toolCallId": "call_wQxdakrO15NNScvqwngijnCu",
"result": "Your result here"
}
]
}toolCallIdt
Tafting
05/27/2025, 4:49 PMIt doesn't work, I tried with code and here's the error I get:
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vapiInstance.send({
type: "add-message",
message: {
role: "tool_call_result",
toolCallId: toolCall.id || toolCall.toolCallId,
name: toolCall.function?.name || toolCall.name,
content: result
}
}); Copy code
incoming-webhook failed validation. Errors: [ "message.property toolCallId should not exist", "message.property name should not exist", "message.role must be one of the following values: assistant, function, user, system, tool" ]v
Vapi Support Bot
05/27/2025, 4:52 PMYou cannot send a tool response (with
toolCallId Copy code
json
{
"results": [
{
"toolCallId": "call_wQxdakrO15NNScvqwngijnCu",
"result": "Your result here"
}
]
}s
Sahil
05/27/2025, 5:51 PMNope, it is not.
v
Vapi Support Bot
05/27/2025, 5:52 PMYou cannot send a tool response with
toolCallId Copy code
json
{
"results": [
{
"toolCallId": "call_wQxdakrO15NNScvqwngijnCu",
"result": "Your result here"
}
]
}