When using the $everything operation(https://www.hl7.org/fhir/patient-operation-everything.html), it appears the currently implementation is not paginated. This means that the response Bundle can be quite large for patients with a large number of resources. The

_count

operation doesn't seem to be implemented based on testing and code review, either. Is that right? Just wanted a sanity check.

Yes, that is correct. This is a good call that paginated would be helpful here.