Which built-in VAULT user is NOT automatically added to a Safe upon creation?

The built-in VAULT user that is not automatically added to a Safe upon creation is the Admin user. The reason for this is rooted in the access management model of the vault system. The Admin user is typically intended for high-level management tasks and has overarching control over all aspects of the vault, including user permissions and Safe management.

When a Safe is created, it is designed to contain specific users and their associated roles for operational purposes. The automatic addition of certain user types, such as Master, User, and Auditor, is intended to ensure that there are designated individuals or roles who can interact with or oversee the Safe's contents right from the start. However, for security and management reasons, the Admin user is not included automatically. Instead, an Admin can be granted access or added later to ensure that the assignment of permissions is deliberate and controlled, aligning with best practices in access management.

This distinction emphasizes the importance of maintaining a clear separation of roles and responsibilities within the vault to prevent potential misuse or overreach in access control, thus ensuring a more secure and auditable environment.