Hi Chris,
For function tools, Vapi defaults to using POST for HTTP requests. Unfortunately, there isn't an option to change this to GET through the UI at the moment. If you require data retrieval via GET, an alternative approach would be to handle this within your endpoint by accepting POST requests and routing them accordingly.
If you have specific use cases that necessitate GET requests directly from Vapi tools, you might consider implementing an intermediary service to convert POST calls to GET for those requests.