[libvirt-users] Guest Agent and API Relationship

All - I have looked everywhere I can think of (except the C code) to see if I can find the relationship of an API to the guest agent. What I want to know is whether or not a given API has a dependency on the guest agent being available. I know that some of the APIs now have such a dependency but there does not seem to be an indicator in the documentation for when this is the case. Nor is there any comprehensive list of APIs that have a dependency on the guest agent. Any help would be useful. Thanks, W. David Ashley