Pre-release protocol

This page documents the changes from the last stable Minecraft release (currently 1.10.2, protocol 210) to the current pre-release (currently 16w32a, protocol 301). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes so far.

Packets

No changes so far.

New/modified data types

None so far.

Handshaking

Clientbound

No changes so far.

Serverbound

No changes so far.

Play

Clientbound

Spawn Mob

Sent by the server when a mob entity is spawned.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x03	Play	Client	Entity ID	VarInt
			Entity UUID	UUID
			Type	Unsigned Byte VarInt	The type of mob. See Entities#Mobs
			X	Double
			Y	Double
			Z	Double
			Yaw	Angle
			Pitch	Angle
			Head Pitch	Angle
			Velocity X	Short	Same units as Entity Velocity
			Velocity Y	Short	Same units as Entity Velocity
			Velocity Z	Short	Same units as Entity Velocity
			Metadata	Entity Metadata

Collect Item

Sent by the server when someone picks up an item lying on the ground — its sole purpose appears to be the animation of the item flying towards you. It doesn't destroy the entity in the client memory, and it doesn't add it to your inventory. The server only checks for items to be picked up after each Player Position (and Player Position And Look) packet sent by the client.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x48	Play	Client	Collected Entity ID	VarInt
			Collector Entity ID	VarInt
			Unknown	VarInt

Serverbound

No changes so far.

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.