Hi 🙂 I just started to use Vapi and I managed to get the first customized tool integrated with my assistant. But I didn't find any documentation about how to use the data from the tool call response. For example my api will return a boolean indicating if the receiver is available now. I want to use that to determin if my agent should pass the call through or just take a message for now since the receiver is not available. Can anyone advise how to leverage the variable from the tool call response?