The list commmand returns all of the names and versions of all of the templates that are loaded in the archetype template directory.
archetype list
This will return a table of known templates like this:
NAME VERSION
go_module 2.0.1
bash_script 1.0.0
ruby_cli_gem 1.0.0
In the event that any templates are invalid or unable to be used, a warning will be displayed with the path to the template where changes are required to make it compatible:
WARN: `$HOME/Code/templates/ruby/rails_api_service/manifest.json` is invalid, skipping
It is only the templates that appear in the list that can be rendered using the archetype render command.