/friend

• /friend ...

  Prints the friend command help, each row clickable to fill the command into the chat box (without sending it).

  • ... list

    Lists the permanent and temporary friend lists; every name in them is clickable and fills in the matching removal command.

  • ... add <player>

    Adds a temporary friend, which is gone after the next login.

  • ... remove <player>

    Removes a temporary friend; a permanent friend is refused with a pointer to the next command.

  • ... permanent add <player>

    Adds a permanent friend, which is written to the save; a temporary friend is upgraded rather than duplicated.

  • ... permanent remove <player>

    Removes a permanent friend.

The friend list

"Temporary" here means cleared at the next login: both a relog and a server restart clear it, while a respawn does not. Adding and removing both resolve the player profile, so an offline player works too — type the name and it is added. The details are on Identification.