This is a known issue with Vapi: in chat mode, the assistant sometimes does not return the expected message with tool call arguments and may hang or skip steps, unlike in voice mode where tool calling works as expected. As a first step, review your assistant and tool configurations to ensure nothing was recently changed that could affect tool calling. If the issue persists, check your server logs for errors and verify that tool call responses are formatted correctly. If these steps do not resolve the problem, you may need to contact Vapi support, as this may be a platform-level bug with chat tool calling behavior ([documentation](https://discord.com/channels/1211482211119796234/1332537726813343754)). Sources: - [Vapi assistant tool calling chat interaction (Discord)](https://discord.com/channels/1211482211119796234/1332537726813343754) - [Troubleshoot Vapi assistant tool calling not working (Discord)](https://discord.com/channels/1211482211119796234/1334114042876264518)