The console's current tenant: the value threaded through every Ash call so that multitenant resources can be browsed.

A tenant is application knowledge — Ash can say a resource needs one, never which one you mean — so it is asked for rather than inferred. Kept in the HTTP session beside the actor, and for the same reason: a LiveView cannot write the session through its socket (see GreenAsh.SessionController).

There is no validation of the value. Ash accepts any term as a tenant, and a console whose job is to probe your resources has no business deciding which tenants are real.