Assistant tool overrides not working.
# supportn
nooo
09/19/2025, 8:40 AMI’m setting assistantOverride.tools/toolids, but it seems to be getting ignored.
Even if I pass an empty array, the assistant still calls the default tools (like transfer_call).
And if I include only one tool (e.g. tag_contact), it logs as if it used it but the webhook isn’t called.
Am I misunderstanding how assistantOverride works, or doing something wrong here?
My goal is to override the tools completely and remove the ones used for calls, so only the chat-relevant tools are available.
l
Lordvickthor
09/19/2025, 11:55 AMI understand your challenge with assistantOverride.tools not behaving as expected. I’ve worked on customizing tool availability before, including stripping out defaults like transfer_call and ensuring only specific tools trigger correctly. I can help you troubleshoot the override logic and verify the correct way to pass tool IDs so the webhook fires properly. Are you trying to control this at the session level or directly in the assistant config? Let’s connect and walk through it together. @nooo
n
nooo
09/19/2025, 2:32 PMThanks for reaching out dude. I am doing this when creating a chat through vapi api directly... i am not sure if that is session level but it sounds more like changing the assistant config.
nooo
09/19/2025, 2:36 PMI already have the assistant configured for call.. but i wish to use the same assistant for standalone chats so i need to rid of the end_call and transfer_call tools
l
Lordvickthor
09/19/2025, 2:56 PMI see that you’re creating chats via the API and want to reuse your assistant without the call tools. I can handle updating the assistant configuration so only the chat-relevant tools are active and ensure the webhooks trigger correctly. The easiest way to get this done quickly is to continue this conversation privately, so I can implement it for you directly. @nooo
n
nooo
09/22/2025, 8:07 AMI dont see why you'll want to get hands on with my code... when you can simply tell me here what i can do. I'd rather stay here in support then give you access to the codebase in dms.
nooo
09/22/2025, 8:08 AMI have everything ready all i need is the assistant Overrides to work if you can tell me about it here then its good other than that its fine.
nooo
09/22/2025, 8:10 AM Copy code
const requestBody: {
assistantId: string
assistantOverrides?: {
variableValues?: Record<string, string>
}
input: Array<{
role: 'user' | 'assistant' | 'system'
content: string
}>
stream: boolean
previousChatId?: string | null
} = {
assistantId: assistant.vapiId!,
input: input as any,
stream: false,
assistantOverrides: {
variableValues: variables,
},
}
if (!isNewConversation) {
requestBody.previousChatId = previousChatId
}
const chatResponse = await fetch('https://api.vapi.ai/chat', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer ${process.env.VAPI_API_KEY}`,
},
body: JSON.stringify(requestBody),
})nooo
09/22/2025, 8:11 AMthis is the code i have. where i am creating a chat with assistant overrides.
nooo
09/22/2025, 8:13 AM@Vapi Support Bot
v
Vapi Support Bot
09/22/2025, 8:14 AMCurrently, the documentation does not show support for overriding tools or toolIds via
assistantOverrides/chatvariableValuesend_calltransfer_call Copy code
js
assistantOverrides: {
variableValues: { ... } // Only variable overrides are supported here
}n
nooo
09/22/2025, 8:18 AM@Vapi Support Bot why does the api support the assistant's being overided then ?
https://docs.vapi.ai/api-reference/chats/create#request.body.assistantOverrides.model.OpenAI.toolIds
v
Vapi Support Bot
09/22/2025, 8:19 AMDespite the API reference listing
assistantOverrides.model.OpenAI.toolIdsvariableValuesv
Vapi Support Bot
09/22/2025, 8:21 AMMessage marked as helpful by @nooo! 🎉
Vapi Support Bot
09/22/2025, 8:21 AMMessage marked as helpful by @nooo! 🎉
Vapi Support Bot
09/22/2025, 8:21 AMMessage marked as helpful by @nooo! 🎉
c
Chiranjeet Mishra
09/23/2025, 4:04 AMIf you need additional support with this, please let us know
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