Bukkit

I dont know any plugin for spawn so i wanted to make my own and i dont know whats the perm or how to delete perm without "Unknown command. Type "/help" for help." heres the code:
spawn:
  command: /spawn
  type:
  - ADD_PERMISSION
  - RUN_COMMAND
  runcmd:
  - /warp spawn
  permission-required: false

You should doing this instead:

spawn:
  command: /spawn
  type: RUN_COMMAND
  runcmd:
  - '/warp spawn' 
  permission-required: false

If you want to add some permission to player when they use /spawn:

...

  runcmd:
  - '/warp spawn' 

  - '$Script$AddPermission=your.custom.permission'

...

$Script$AddPermission= to add permission, $Script$AddPermission= to remove a permission

If you want player requires a permission (like they need to have permission server.spawn to use the command, or anything you want) to use /spawn command:

...

  runcmd:
  - '/warp spawn' 
  permission-required: true

  permission-node: server.spawn (or anything you want)

Note: You need Vault and a Permission Manager Plugin (like LuckPerms) for permission manager