We added the ability to tag prompt versions via the client in arize-phoenix>=8.22.0 and arize-phoenix-client>=1.2.0. Please give it a try when you get a chance and let us know if you have any questions. Thanks.
Example usage:
Client().prompts.tags.list(prompt_version_id="...")
Client().prompts.tags.create(
prompt_version_id="version-123",
name="testing",
)