Hi, A new attribute "tags" has been added to the template parameters in heat [1]. By adding this, we can categorize the parameters based on features, which can be used for validations. Currently, I am working on a patch [2] which will add the "role_specific" tag to the parameters, which are accepted as role-specific. The next step is to add a validation to role-specific parameters. Regards, Saravanan KR [1] https://review.openstack.org/#/c/506133/ [2] https://review.openstack.org/#/c/517231/