VAPI•4mo ago

Issue with Assistant Agent not automatically saying API result.

This only starts to happen from today. This was the main reason I switch our whole agent from workflow to Assistant and now it is happeneing in Assistant too.

crooked-brownOP•9/4/25, 7:28 AM

Please hold on... and the Here are your... are both Tool messages.

Vapi Support BotAPP•9/4/25, 7:29 AM

Suggestion:
Double-check that your Assistant's configuration includes a valid

firstMessage

firstMessage

and that both the Assistant ID and Phone Number ID are correctly set. If the

firstMessage

firstMessage

is missing, the assistant will wait for user input instead of speaking automatically. Here’s an example of setting the

firstMessage

firstMessage

in your assistant configuration:

{
  "firstMessage": "Here are your property details."
}

{
  "firstMessage": "Here are your property details."
}

Update your assistant via the API or dashboard and test if the agent now speaks the API result automatically.
Reference: Vapi documentation

Source:

Vapi documentation Update Assistant

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

crooked-brownOP•9/4/25, 7:31 AM

I didn't do any changes to the Assistant, It was working fine yesterday and this issue where it needs some user input after a tool call was only happening too workflow agent not Assistant. But now it even is happening to Assistant agent too.

crooked-brownOP•9/4/25, 7:42 AM

skinny-azure•9/4/25, 8:45 AM

@Toph Hi fellow VAPI user, trying to help...I guess we had the same issue - literally the caller needed to say something to trigger the output flow continuing. Kyle told me the workaround for now is to configure an "empty" Tool Start Message, so the flow continues. Have you tried that?

unique-blue•9/4/25, 8:59 AM

same problem here.

unique-blue•9/4/25, 8:59 AM

@Toph

unique-blue•9/4/25, 8:59 AM

been happening all day

skinny-azure•9/4/25, 8:59 AM

However, I just notice the problem is back for us, too!!!

unique-blue•9/4/25, 8:59 AM

it will call the tool and then not say anything

skinny-azure•9/4/25, 9:00 AM

If the user speaks, it will continue

unique-blue•9/4/25, 9:00 AM

thats not a fix tho lol

skinny-azure•9/4/25, 9:00 AM

I know, been having this problem since weeks man

unique-blue•9/4/25, 9:00 AM

weeks?!?!?

skinny-azure•9/4/25, 9:01 AM

Yes

skinny-azure•9/4/25, 9:01 AM

I had a separate thread open, can´t find it anymore

unique-blue•9/4/25, 9:01 AM

I was gonna have a call with a client today aswell luckuily its changed for tommorow but i may have to move over to something else in the meantime

skinny-azure•9/4/25, 9:02 AM

Kyle told me to configure an empty "say" message in the tool as start message, as a workaround for now.

skinny-azure•9/4/25, 9:03 AM

However I did not need to do it as apparently it seems to be fixed

skinny-azure•9/4/25, 9:03 AM

But now it is popping up again, same problem.

skinny-azure•9/4/25, 9:03 AM

Just trying the fix... let´s see

unique-blue•9/4/25, 9:04 AM

does the say thing fix it?

unique-blue•9/4/25, 9:05 AM

add me bro

unique-blue•9/4/25, 9:05 AM

ima email vapi

unique-blue•9/4/25, 9:11 AM

@Sentinel add me back asap

skinny-azure•9/4/25, 9:12 AM

added

skinny-azure•9/4/25, 9:41 AM

@Vapi Team -> Kyle Brunker please can you look into this? This is the exact same problem we were discussing on another thread like 2 weeks ago, when you mentioned the workaround with an "empty" start message in the tool call. However, yesterday it worked perfectly fine even without any messages, but since today the problem is back.

skinny-azure•9/4/25, 9:44 AM

@Vapi Call ID yesterday, where Tool calls worked fine without having any start or else message in the tool call: 24369a89-c0fb-4980-b211-bcdc77a26396

skinny-azure•9/4/25, 9:45 AM

Call ID from TODAY where it does not work, even with a message configured, as long as the user stays silent, the call will just end

skinny-azure•9/4/25, 9:45 AM

5bf0f177-1072-457c-a0cf-4ead43662b73

crooked-brownOP•9/4/25, 1:30 PM

Hi guys, read your discussion. Have you guys found any solution for this yet. @Ronan @Sentinel

crooked-brownOP•9/4/25, 1:31 PM

This was the main reason I switch from workflow to assistant type of agent.

crooked-brownOP•9/4/25, 1:31 PM

It starts to happen like today, as It was working fine yesterday.

crooked-brownOP•9/4/25, 1:32 PM

I emailed the support team but haven't got response yet.

unique-blue•9/4/25, 1:32 PM

I’ll go check it out again soon. Only fix now: After it says booking now or whatever just say okay after it does the tool call then it will talk back and continue on like normal

unique-blue•9/4/25, 1:32 PM

As long as u speak it will keep going

worthy-azure•9/4/25, 1:33 PM

Alot of tickets about this. Having the same problem myself

unique-blue•9/4/25, 1:34 PM

Was talking to my partner were most likely going to move to vapi cli or just get enterprise plan with 24/7 dev support

unique-blue•9/4/25, 1:34 PM

If u have enterprise plan u just tell em and they will fix bug up for you

crooked-brownOP•9/4/25, 1:34 PM

still not working

unique-blue•9/4/25, 1:34 PM

Did it continue talking after u said what’s the detail

unique-blue•9/4/25, 1:34 PM

Add me back

crooked-brownOP•9/4/25, 1:35 PM

Yes, it talks and say the API result to you but you have to say something to it.

unique-blue•9/4/25, 1:35 PM

@kitten make a post more people who post and email them the better

crooked-brownOP•9/4/25, 1:35 PM

Otherwise, it will be quiet.

Ccrooked-brown Yes, it talks and say the API result to you but you have to say something to it.

unique-blue•9/4/25, 1:35 PM

That’s currently only fix

unique-blue•9/4/25, 1:36 PM

I have quite a few connections in the space I’ll try get in contact with a senior dev in vapi to find out more

crooked-brownOP•9/4/25, 1:36 PM

This was the main reason I left my whole 1 month of work on the workflow type of agent, this is the main issue that's happening there. But now it is happening in Assistant too.

Uunique-blue I have quite a few connections in the space I’ll try get in contact with a senio...

crooked-brownOP•9/4/25, 1:37 PM

That'll be great. Keep me updated anything you get on this issue.

Wworthy-azure Alot of tickets about this. Having the same problem myself

dangerous-fuchsia•9/4/25, 2:36 PM

@kitten @Chris @Kartik

Can you switch your orgs from daily to weekly?

Issue with Assistant Agent not automatically saying API result.

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