I can't see any documentation on the contexts.yml/default-contexts option. Here's something I wrote that could go at the end of https://github.com/lucko/LuckPerms/wiki/Context#defining-static-contexts but I'm open to improvements 🤣

Default Contexts

Default contexts allow you to specify contexts that are applied to commands if you don't add contexts to the end of the command - for example /lp user Luck permission set example.permission. You can define them in the contexts.yml file, in the same folder as the main config.

For example, to add a default context to the file, simply add, below the static-contexts section:

{
 "default-contexts": {
    "world": "world_nether",
    "server": "survival"
  }
}

This would mean that, for /lp commands on the server which you've added the default context, any commands that can be performed with a context will use world=world_nether,server=survival unless you specify otherwise.

Thanks, merged with LuckPerms/wiki@7a98e73