MOB is client for all vSphere SOAP based APIs. Tags are not part of these vSphere APIs. As part of vSphere 6.5, VMware released REST APIs as well and tag APIs are included there.
Here is REST API getting started tutorial: http://vthinkbeyondvm.com/getting-started-with-vcenter-server-rest-apis-using-python/
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Thanks & Regards
Vikas, VCP70, MCTS on AD, SCJP6.0, VCF, vSphere with Tanzu specialist.
https://vThinkBeyondVM.com/about
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Disclaimer: Any views or opinions expressed here are strictly my own. I am solely responsible for all content published here. Content published here is not read, reviewed or approved in advance by VMware and does not necessarily represent or reflect the views or opinions of VMware.