Currently the agent-based installer creates a full ISO for all platforms, except for OCI (External) platforms in which a minimal ISO is created by default. Work is being done to support the minimal ISO for all platforms. In this case either a new command must be used to create the minimal, instead of full ISO, or a flag added to the "agent create image"
command.

UPDATE 9/30: From feedback from Zane (https://github.com/openshift/installer/pull/9056#discussion_r1777838533) the plan has changed to use a new field in agent-config.yaml to define that a minimal ISO should be generated instead of either a new command, or flag to existing command.