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Not really doable at the moment, transformations are just run in the program as a pre-step to sending to the engine at the moment. But we are looking at over hauling how they work and this could be something that we look at supporting in the new system.

Hi Fraser! Thanks for the response :slightly_smiling_face: That’s what I assumed after reading all the docs I could find.

I wonder - let’s say that first I run `pulumi preview --save-plan=plan.json` and then during `pulumi up` I  read that json and only apply ‘dynamic value’ tags for the resources that have create/update in that plan. Would that work?

The only problem for me was that I couldn’t really figure out how, from code perspective, which Pulumi command is being executed, whether it was `preview` or `up` - I saw `Deployment.Instance.IsDryRun` could I use that?

Yup DryRun tells you if it's preview or not