Pre-release protocol

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Revision as of 18:43, 27 October 2023 by WinX64 (talk | contribs) (23w43b)
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This page documents the changes from the last stable Minecraft release (currently 1.20.2, protocol 764) to the current pre-release (currently 23w43b, protocol Snapshot 160). 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

NBT

The NBT specification was changed so that the root tag is no longer required to be a Compound Tag when sent over the network.

Presently in the pre-release, only Compound Tag and String Tag types are used as root, but the Notchian server/client implementation is able to handle NBT Tags of any type.

Chat

The Chat type is now serialized as a NBT Tag instead of a JSON String, unless explicitly stated otherwise.

Name Size (bytes) Encodes Notes
Chat ≥ 1
≤ (262144×4) + 3 		See Chat Encoded as a String with max length of 262144.
Chat Varies See Chat Encoded as a NBT Tag, with the type of tag used depending on the case:
  • As a String Tag: For components only containing text (no styling, no events etc.).
  • As a Compound Tag: Every other case.

This affects the following packets and data types containing Chat fields:



However, the following are NOT affected, as to maintain backwards compatibility with older versions:

Particle

Particle Name Particle ID Data
minecraft:ambient_entity_effect 0 None
minecraft:angry_villager 1 None
minecraft:block 2
Field Name Field Type Meaning
BlockState VarInt The ID of the block state.
minecraft:block_marker 3
Field Name Field Type Meaning
BlockState VarInt The ID of the block state.
minecraft:bubble 4 None
minecraft:cloud 5 None
minecraft:crit 6 None
minecraft:damage_indicator 7 None
minecraft:dragon_breath 8 None
minecraft:dripping_lava 9 None
minecraft:falling_lava 10 None
minecraft:landing_lava 11 None
minecraft:dripping_water 12 None
minecraft:falling_water 13 None
minecraft:dust 14
Field Name Field Type Meaning
Red Float The red RGB value, between 0 and 1. Divide actual RGB value by 255.
Green Float The green RGB value, between 0 and 1. Divide actual RGB value by 255.
Blue Float The blue RGB value, between 0 and 1. Divide actual RGB value by 255.
Scale Float The scale, will be clamped between 0.01 and 4.
minecraft:dust_color_transition 15
Field Name Field Type Meaning
From Red Float The start red RGB value, between 0 and 1. Divide actual RGB value by 255.
From Green Float The start green RGB value, between 0 and 1. Divide actual RGB value by 255.
From Blue Float The start blue RGB value, between 0 and 1. Divide actual RGB value by 255.
Scale Float The scale, will be clamped between 0.01 and 4.
To Red Float The end red RGB value, between 0 and 1. Divide actual RGB value by 255.
To Green Float The end green RGB value, between 0 and 1. Divide actual RGB value by 255.
To Blue Float The end blue RGB value, between 0 and 1. Divide actual RGB value by 255.
minecraft:effect 16 None
minecraft:elder_guardian 17 None
minecraft:enchanted_hit 18 None
minecraft:enchant 19 None
minecraft:end_rod 20 None
minecraft:entity_effect 21 None
minecraft:explosion_emitter 22 None
minecraft:explosion 23 None
minecraft:sonic_boom 24 None
minecraft:falling_dust 25
Field Name Field Type Meaning
BlockState VarInt The ID of the block state.
minecraft:firework 26 None
minecraft:fishing 27 None
minecraft:flame 28 None
minecraft:cherry_leaves 29 None
minecraft:sculk_soul 30 None
minecraft:sculk_charge 31
Field Name Field Type Meaning
Roll Float How much the particle will be rotated when displayed.
minecraft:sculk_charge_pop 32 None
minecraft:soul_fire_flame 33 None
minecraft:soul 34 None
minecraft:flash 35 None
minecraft:happy_villager 36 None
minecraft:composter 37 None
minecraft:heart 38 None
minecraft:instant_effect 39 None
minecraft:item 40
Field Name Field Type Meaning
Item Slot The item that will be used.
minecraft:vibration 41
Field Name Field Type Meaning
Position Source Type Identifier The type of the vibration source
Block Position Position The position of the block the vibration originated from. Only present if Position Type is minecraft:block.
Entity ID VarInt The ID of the entity the vibration originated from. Only present if Position Type is minecraft:entity.
Entity eye height Float The height of the entity's eye relative to the entity. Only present if Position Type is minecraft:entity.
Ticks VarInt The amount of ticks it takes for the vibration to travel from its source to its destination.
minecraft:item_slime 42 None
minecraft:item_snowball 43 None
minecraft:large_smoke 44 None
minecraft:lava 45 None
minecraft:mycelium 46 None
minecraft:note 47 None
minecraft:poof 48 None
minecraft:portal 49 None
minecraft:rain 50 None
minecraft:smoke 51 None
minecraft:white_smoke 52 None
minecraft:sneeze 52 53 None
minecraft:spit 53 54 None
minecraft:squid_ink 54 55 None
minecraft:sweep_attack 55 56 None
minecraft:totem_of_undying 56 57 None
minecraft:underwater 57 58 None
minecraft:splash 58 59 None
minecraft:witch 59 60 None
minecraft:bubble_pop 60 61 None
minecraft:current_down 61 62 None
minecraft:bubble_column_up 62 63 None
minecraft:nautilus 63 64 None
minecraft:dolphin 64 65 None
minecraft:campfire_cosy_smoke 65 66 None
minecraft:campfire_signal_smoke 66 67 None
minecraft:dripping_honey 67 68 None
minecraft:falling_honey 68 69 None
minecraft:landing_honey 69 70 None
minecraft:falling_nectar 70 71 None
minecraft:falling_spore_blossom 71 72 None
minecraft:ash 72 73 None
minecraft:crimson_spore 73 74 None
minecraft:warped_spore 74 75 None
minecraft:spore_blossom_air 75 76 None
minecraft:dripping_obsidian_tear 76 77 None
minecraft:falling_obsidian_tear 77 78 None
minecraft:landing_obsidian_tear 78 79 None
minecraft:reverse_portal 79 80 None
minecraft:white_ash 80 81 None
minecraft:small_flame 81 82 None
minecraft:snowflake 82 83 None
minecraft:dripping_dripstone_lava 83 84 None
minecraft:falling_dripstone_lava 84 85 None
minecraft:dripping_dripstone_water 85 86 None
minecraft:falling_dripstone_water 86 87 None
minecraft:glow_squid_ink 87 88 None
minecraft:glow 88 89 None
minecraft:wax_on 89 90 None
minecraft:wax_off 90 91 None
minecraft:electric_spark 91 92 None
minecraft:scrape 92 93 None
minecraft:shriek 93 94
Field Name Field Type Meaning
Delay VarInt The time in ticks before the particle is displayed
minecraft:egg_crack 94 95 None
minecraft:dust_plume 96 None

Packets

ID Packet name Documentation
Configuration clientbound
0x07 Feature Flags Current Pre
Play clientbound
0x20 Game Event Current Pre
0x6C Set Ticking State Pre
0x6D Step Tick Pre
0x6C 0x6E Update Advancements Current (unchanged)
0x6D 0x6F Update Attributes Current (unchanged)
0x6E 0x70 Entity Effect Current (unchanged)
0x6F 0x71 Update Recipes Current (unchanged)
0x70 0x72 Update Tags Current (unchanged)
Play serverbound
0x0F Change Container Slot State Pre
0x0F 0x10 Serverbound Plugin Message (play) Current (unchanged)
0x10 0x11 Edit Book Current (unchanged)
0x11 0x12 Query Entity Tag Current (unchanged)
0x12 0x13 Interact Current (unchanged)
0x13 0x14 Jigsaw Generate Current (unchanged)
0x14 0x15 Serverbound Keep Alive (play) Current (unchanged)
0x15 0x16 Lock Difficulty Current (unchanged)
0x16 0x17 Set Player Position Current (unchanged)
0x17 0x18 Set Player Position and Rotation Current (unchanged)
0x18 0x19 Set Player Rotation Current (unchanged)
0x19 0x1A Set Player On Ground Current (unchanged)
0x1A 0x1B Move Vehicle Current (unchanged)
0x1B 0x1C Paddle Boat Current (unchanged)
0x1C 0x1D Pick Item Current (unchanged)
0x1D 0x1E Ping Request (play) Current (unchanged)
0x1E 0x1F Place Recipe Current (unchanged)
0x1F 0x20 Player Abilities Current (unchanged)
0x20 0x21 Player Action Current (unchanged)
0x21 0x22 Player Command Current (unchanged)
0x22 0x23 Player Input Current (unchanged)
0x23 0x24 Pong (play) Current (unchanged)
0x24 0x25 Change Recipe Book Settings Current (unchanged)
0x25 0x26 Set Seen Recipe Current (unchanged)
0x26 0x27 Rename Item Current (unchanged)
0x27 0x28 Resource Pack Response (play) Current (unchanged)
0x28 0x29 Seen Advancements Current (unchanged)
0x29 0x2A Select Trade Current (unchanged)
0x2A 0x2B Set Beacon Effect Current (unchanged)
0x2B 0x2C Set Held Item Current (unchanged)
0x2C 0x2D Program Command Block Current (unchanged)
0x2D 0x2E Program Command Block Minecart Current (unchanged)
0x2E 0x2F Set Creative Mode Slot Current (unchanged)
0x2F 0x30 Program Jigsaw Block Current Pre
0x30 0x31 Program Structure Block Current (unchanged)
0x31 0x32 Update Sign Current (unchanged)
0x32 0x33 Swing Arm Current (unchanged)
0x33 0x34 Teleport To Entity Current (unchanged)
0x34 0x35 Use Item On Current (unchanged)
0x35 0x36 Use Item Current (unchanged)

New/modified data types

No changes so far.

Entity Metadata

Abstract Vehicle

Extends Entity.

Index Type Meaning Default
8 VarInt Shaking power 0
9 VarInt Shaking direction 1
10 Float Shaking multiplier 0.0

Abstract Minecart

Extends Abstract Vehicle.

Index Type Meaning Default
8 VarInt Shaking power 0
9 VarInt Shaking direction 1
10 Float Shaking multiplier 0.0
11 VarInt Custom block ID and damage 0
12 VarInt Custom block Y position (in 16ths of a block) 6
13 Boolean Show custom block false

Boat

Extends Abstract Vehicle.

Index Type Meaning Default
8 VarInt Time since last hit 0
9 VarInt Forward direction 1
10 Float Damage taken 0.0
11 VarInt Type (0=oak, 1=spruce, 2=birch, 3=jungle, 4=acacia, 5=dark oak) 0
12 Boolean Is left paddle turning false
13 Boolean Is right paddle turning false
14 VarInt Splash timer 0

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

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.

Configuration

Clientbound

Feature Flags

Used to enable and disable features, generally experimental ones, on the client.

Packet ID State Bound To Field Name Field Type Notes
0x07 Configuration Client Total Features VarInt Number of features that appear in the array below.
Feature Flags Identifier Array

As of 1.20.2 1.20.3, the following feature flags are available:

  • minecraft:vanilla - enables vanilla features
  • minecraft:bundle - enables support for the bundle
  • minecraft:trade_rebalance - enables support for the rebalanced villager trades
  • minecraft:update_1_21 - enables support for 1.21 features

Serverbound

No changes so far.

Play

Clientbound

Game Event

Used for a wide variety of game events, from weather to bed use to game mode to demo messages.

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Client Event Unsigned Byte See below.
Value Float Depends on Event.

Events:

Event Effect Value
0 No respawn block available Note: Displays message 'block.minecraft.spawn.not_valid' (You have no home bed or charged respawn anchor, or it was obstructed) to the player.
1 Begin raining
2 End raining
3 Change game mode 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
4 Win game 0: Just respawn player.
1: Roll the credits and respawn player.
Note that 1 is only sent by notchian server when player has not yet achieved advancement "The end?", else 0 is sent.
5 Demo event 0: Show welcome to demo screen.
101: Tell movement controls.
102: Tell jump control.
103: Tell inventory control.
104: Tell that the demo is over and print a message about how to take a screenshot.
6 Arrow hit player Note: Sent when any player is struck by an arrow.
7 Rain level change Note: Seems to change both sky color and lighting.
Rain level ranging from 0 to 1.
8 Thunder level change Note: Seems to change both sky color and lighting (same as Rain level change, but doesn't start rain). It also requires rain to render by notchian client.
Thunder level ranging from 0 to 1.
9 Play pufferfish sting sound
10 Play elder guardian mob appearance (effect and sound)
11 Enable respawn screen 0: Enable respawn screen.
1: Immediately respawn (sent when the doImmediateRespawn gamerule changes).
12 Limited crafting 0: Disable limited crafting.
1: Enable limited crafting (sent when the doLimitedCrafting gamerule changes).
13 Start waiting for level chunks Instructs the client to begin the waiting process for the level chunks.
Sent by the server after the level is cleared on the client and is being re-sent (either during the first, or subsequent reconfigurations).

Set Ticking State

Used to adjust the ticking rate of the client, and whether it's frozen.

Packet ID State Bound To Field Name Field Type Notes
0x6C Play Server Tick rate Float
Is frozen Boolean

Step Tick

Advances the client processing by the specified number of ticks. Has no effect is the client ticking is not frozen.

Packet ID State Bound To Field Name Field Type Notes
0x6D Play Client Tick steps VarInt

Serverbound

Change Container Slot State

This packet is sent by the client when toggling the state of a Crafter.

Packet ID State Bound To Field Name Field Type Notes
0x0F Play Server Slot ID VarInt This is the ID of the slot that was changed.
Window ID VarInt This is the ID of the window that was changed.
State Boolean The new state of the slot. True for enabled, false for disabled.

Program Jigsaw Block

Sent when Done is pressed on the Jigsaw Block interface.

Packet ID State Bound To Field Name Field Type Notes
0x2F Play Server Location Position Block entity location
Name Identifier
Target Identifier
Pool Identifier
Final state String (32767) "Turns into" on the GUI, final_state in NBT.
Joint type String (32767) rollable if the attached piece can be rotated, else aligned.
Selection priority VarInt
Placement priority VarInt
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