1.13 shows the holographicdisplays command tab-complete in the tab-complete list when they don't have permission to even use the command. A way to fix this is to setup a plugin.yml that includes a permission setup:

commands:
  start:
    description: hub of important commands.
    aliases: info
    permission: test.start

permissions:
  test.start:
    description: give access to /start
    default: op

This type of setup would prevent a player without access test.start from seeing /start in their tab-complete list.

@filoghost yeah, you should always define all the commands and permissions in tge plugin.yml file, so the new bukkit command system can correctly handle tab complete and permission checks.

@filoghost if you would like it to be enabled by default you can do this:

commands:
  hd:
    description: hub of important commands.
    aliases: info
    permission: holographicdisplays.help

permissions:
  holographicdisplays.help:
    description: give access to /hd
    default: true

This gives an option for servers who don't want non administrators seeing admin commands. If you'd like the output of /hd to still print to chat, you can always ignore the permission. This is mainly to declutter the tablist. You can manually do this via code thought this method is alot easier.

The command is only one, /hd, and is accessible to everyone if used without arguments. Subcommands are restricted by permissions, but I don't think they have to be listed in the plugin.yml. Am I missing something?