• I am aware that models registered in Databricks Unity Catalog (UC) in the prod workspace can be loaded from dev workspace for model comparison/debugging. But to comply with best practices, we restrict access to assets in UC in the dev workspace from prod workspace.

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it should be the opposit, the prod workspace, can see the catalogs of the dev workspace, or even better, push these models to a special catalog model_registery.models and then make this visible in dev and prod and contains nothing but the models, no data.