at_tools-8.x-3.x-dev/at_theme_generator/at_theme_generator.routing.yml

at_theme_generator.generator:
  path: '/admin/appearance/at_generate'
  defaults:
    _form: '\Drupal\at_theme_generator\Form\GeneratorForm'
    _title: 'AT Theme Generator'
  requirements:
    _permission: 'administer at_theme_generator'