Pre-release protocol

This page documents the changes from the last stable Minecraft release (currently 1.4.6, protocol 51) to the current pre-release (or weekly release). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

New Packets

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Changed Packets

Server to Client

This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.

Packet ID	Field Name	Field Type	Example	Notes
0x64	Window id	byte	123	A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
	Inventory Type	byte	2	The window type to use for display. Check below
	Window title	string	Chest	The title of the window.
	Number of Slots	byte	3	Number of slots in the window (excluding the number of slots in the player inventory).
	Use provided window title	boolean	1	If false, the client will look up a string like "window.minecart". If true, the client uses what the server provides.
Total Size:	6 bytes + length of string

Changed Data Types

-None-

Removed Packets

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Protocol History

13w02a: Added boolean to 0x64 to determine whether or not to use the provided window title.