PrivyChat

Messages sent with the chat command reach players who run PrivyChat and are connected to the same server session. Each message is shown in the regular Minecraft chat with a custom format that includes the sender's name. Players can message one another even when they are on different Minecraft servers, as long as both stay connected to the same backend.

Private rooms are created with a chat command. The creator becomes the owner, and the room is registered on the backend so that only invited players can join. An invite is sent through the backend, the recipient gets a notification, and the invite must be accepted before the room is entered. The backend checks each invitation and returns an error if it is no longer valid. Leaving a room returns the player to global chat mode.

PrivyChat also changes how server chat works: it runs alongside the normal communication network rather than replacing it. Installation requires Fabric. The mod runs on the client and the server, so both sides need it, and it is published under All rights reserved, which makes it not open source. Files exist for 26.1.2 and 26.2, with the 0.0.1 build for 26.2 as the latest release.