The https://projects.theforeman.org/issues/30738 is providing a way to skip the katello-agent installation via host-paramateres but still,

• "redhat_install_agent"\redhat_install_host_tools"\"redhat_install_host_tracer_tools" should not be dependant on activation_key

• User should be able to individually set those parameters as true or false at host or host group level, to decide which package to install and which not to.

Suggesting implementation with a small code modification inside "redhat_register.erb" i.e. to move those parameter declarations out of the if-else loop

~~~
<% if registration_type == 'subscription_manager' >
<
atomic = @host.operatingsystem.respond_to?(:atomic) ? @host.operatingsystem.atomic? : host_param_true?('atomic')

if host_param('kt_activation_keys')
      subscription_manager_certpkg_url = subscription_manager_configuration_url(@host)
      subscription_manager_atomic_url = subscription_manager_configuration_url(@host, false)
      subscription_manager_org = @host.rhsm_organization_label
      activation_key = host_param('kt_activation_keys')
    else
      subscription_manager_certpkg_url = host_param('subscription_manager_certpkg_url')
      subscription_manager_atomic_url = host_param('subscription_manager_atomic_url')
      subscription_manager_org = host_param('subscription_manager_org')
      activation_key = host_param('activation_key')
    end
    redhat_install_agent = host_param_true?('redhat_install_agent')
    redhat_install_host_tools = host_param_true?('redhat_install_host_tools')
    redhat_install_host_tracer_tools = host_param_true?('redhat_install_host_tracer_tools')
  %>
~~~

This change is actually much more efficient as if someone sets "redhat_install_host_tools" to "true" at the host or host group level, only then katello-host-tools will be installed, or else none of those three packages will be installed.