ASSISTANT requires user utterance to progress to next task in prompt, after triggering and succesfully execution of the SMS Tool call and/or BookAppt Tool. Call ID: 019ac9dd-d4d8-7dd7-86df-2d35930fed23, 019acb4b-1e82-755d-bcf5-d10e631d8842 . Same with booking tool call. Assistants and tools were unchanged since sept 2025! The error popped up around after 21st of November, all calls before that date worked perfect. The assistant setup was working 100%, totally fine, but all of a sudden now requires the user to give an utterance after successful tool execution! Makes no sense and my clients are upset. It is not limited to specific assistant. Important: I did not change anything on agent side or tool side for app 2,5 months. These are in production, tested and 100% stabel assistants and tool calls. All worked fine until a few days ago, somewhere after 21st of Nov. I assume VAP changed something in the backend! The assistant executes the tools successfully but then awaits some user utterance to progress to next prompt action. The tools do not require any user interaction after execution.

Action Step: Go to your Vapi dashboard, navigate to

Observe > Call Logs

, and select Call ID

019ac9dd-d4d8-7dd7-86df-2d35930fed23

. Review the tool execution section to check if your booking tool is returning a response that ends the turn, not one that expects further user input. If needed, test your booking tool individually in the dashboard using the

Test

button to ensure it returns a final response and not a prompt for more input. This will help pinpoint if the tool's response is causing the assistant to wait for user utterance after execution ([Vapi Debugging Guide](https://docs.vapi.ai/debugging)). Source: - [Vapi Debugging Guide](https://docs.vapi.ai/debugging)