book.links.task.yml

book.admin:
  route_name: book.admin
  title: 'List'
  base_route: book.admin
book.settings:
  route_name: book.settings
  title: 'Settings'
  base_route: book.admin
  weight: 100

book.outline:
  route_name: book.outline
  base_route: node.view
  title: Outline
  weight: 2