I'm currently integrating VAPI with Make.com via a tool call. Here’s the flow I’m implementing: 1. A tool call is triggered in VAPI and sent to a Make.com webhook. 2. In Make.com, I process the input (e.g., a phone number) and successfully fetch the related data. 3. I then send that data back via the webhook response (i.e., I respond to the tool call with a JSON payload in the correct format). The problem: Even though Make.com sends back the correct JSON format as the webhook response (verified), VAPI does not access or speak the returned data during the conversation. It seems the agent never receives the tool response.

Ensure your Make.com webhook responds with a single-line JSON containing the exact toolCallId, set async false and strict true in the vapi tool config, use Content-Type: application/json, and log incoming payloads to verify everything matches..

This worked, Thanks man

Glad it fixed