Difference between revisions of "Pre-release protocol"

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(→‎Data types: Added Chunk Section)
(→‎Entity Metadata: Merge changes from stable docs to incorporate new metadata type templates. Fix my earlier mistake on Pose in the process.)
 
(106 intermediate revisions by 14 users not shown)
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.17.1, protocol 756]]) to the current pre-release (currently [[Protocol version numbers|21w44a, protocol {{Snapshot PVN|1073741872}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.20.4, protocol 765]]) to the current pre-release (currently [[Protocol version numbers|24w03b, protocol {{Snapshot PVN|1073741996}}]]). 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.
 
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.
Line 9: Line 9:
 
=== Data types ===
 
=== Data types ===
  
* [[#Chunk Section|Chunk Section]]
+
No changes so far.
  
 
=== Packets ===
 
=== Packets ===
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 19: Line 18:
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 
  |-
 
  |-
!colspan="4"| Play clientbound
+
!colspan="4"| Handshake serverbound
{{PacketList|0x0A|Block Entity Data}}
+
{{PacketList|0x00|Handshake}}
{{PacketList|0x22|Chunk Data and Update Light}}
+
|-
{{PacketList|0x26|Join Game}}
+
!colspan="4"| Login clientbound
{{PacketList|0x57|Update Simulation Distance|rel=added}}
+
{{PacketList|0x05|Cookie Request (login)|rel=added}}
{{PacketList|{{change|0x57|0x58}}|Set Title SubTitle|pre=unchanged}}
+
|-
{{PacketList|{{change|0x58|0x59}}|Time Update|pre=unchanged}}
+
!colspan="4"| Login serverbound
{{PacketList|{{change|0x59|0x5A}}|Set Title Text|pre=unchanged}}
+
{{PacketList|0x04|Cookie Response (login)|rel=added}}
{{PacketList|{{change|0x5A|0x5B}}|Set Title Times|pre=unchanged}}
+
|-
{{PacketList|{{change|0x5B|0x5C}}|Entity Sound Effect|pre=unchanged}}
+
!colspan="4"| Configuration clientbound
{{PacketList|{{change|0x5C|0x5D}}|Sound Effect|pre=unchanged}}
+
{{PacketList|0x00|Cookie Request (configuration)|rel=added}}
{{PacketList|{{change|0x5D|0x5E}}|Stop Sound|pre=unchanged}}
+
{{PacketList|{{change|0x00|0x01}}|Clientbound Plugin Message (configuration)|pre=unchanged}}
{{PacketList|{{change|0x5E|0x5F}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x01|0x02}}|Disconnect (configuration)|pre=unchanged}}
{{PacketList|{{change|0x5F|0x60}}|NBT Query Response|pre=unchanged}}
+
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
{{PacketList|{{change|0x60|0x61}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x03|0x04}}|Clientbound Keep Alive (configuration)|pre=unchanged}}
{{PacketList|{{change|0x61|0x62}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x04|0x05}}|Ping (configuration)|pre=unchanged}}
{{PacketList|{{change|0x62|0x63}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x05|0x06}}|Registry Data|pre=unchanged}}
{{PacketList|{{change|0x63|0x64}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x06|0x07}}|Remove Resource Pack (configuration)|pre=unchanged}}
{{PacketList|{{change|0x64|0x65}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x07|0x08}}|Add Resource Pack (configuration)|pre=unchanged}}
{{PacketList|{{change|0x65|0x66}}|Declare Recipes|pre=unchanged}}
+
{{PacketList|0x09|Store Cookie (configuration)|rel=added}}
{{PacketList|{{change|0x66|0x67}}|Tags|pre=unchanged}}
+
{{PacketList|0x0A|Transfer (configuration)|rel=added}}
 +
{{PacketList|{{change|0x08|0x0B}}|Feature Flags|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0C}}|Update Tags (configuration)|pre=unchanged}}
 +
 
 +
|-
 +
!colspan="4"| Configuration serverbound
 +
{{PacketList|0x01|Cookie Response (configuration)|rel=added}}
 +
{{PacketList|{{change|0x01|0x02}}|Serverbound Plugin Message (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x03|0x04}}|Serverbound Keep Alive (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x04|0x05}}|Pong (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x05|0x06}}|Resource Pack Response (configuration)|pre=unchanged}}
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x16|Cookie Request (Play)|rel=added}}
 +
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Chat Suggestions|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Clientbound Plugin Message (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Damage Event|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Delete Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Disguised Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Entity Event|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Game Event|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x22}}|Open Horse Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Hurt Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Initialize World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x25}}|Clientbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Chunk Data and Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x27}}|World Event|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Login (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Map Data|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Merchant Offers|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Update Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Update Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Update Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Open Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Ping (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Ping Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Place Ghost Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x38}}|Player Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x39}}|End Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x39|0x3A}}|Enter Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3B}}|Combat Death|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3C}}|Player Info Remove|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3D}}|Player Info Update|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3E}}|Look At|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3F}}|Synchronize Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x40}}|Update Recipe Book|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x41}}|Remove Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x42}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x43}}|Reset Score|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x44}}|Remove Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x45}}|Add Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x46}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x47}}|Set Head Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x48}}|Update Section Blocks|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x49}}|Select Advancements Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4A}}|Server Data|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4B}}|Set Action Bar Text|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4C}}|Set Border Center|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4D}}|Set Border Lerp Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4E}}|Set Border Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x4F}}|Set Border Warning Delay|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x50}}|Set Border Warning Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x51}}|Set Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x52}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x53}}|Set Center Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x54}}|Set Render Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x55}}|Set Default Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x56}}|Display Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x57}}|Set Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x58}}|Link Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x59}}|Set Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5A}}|Set Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5B}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5C}}|Set Health|pre=unchanged}}
 +
{{PacketList|{{change|0x5C|0x5D}}|Update Objectives|pre=unchanged}}
 +
{{PacketList|{{change|0x5D|0x5E}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x5E|0x5F}}|Update Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x5F|0x60}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x60|0x61}}|Set Simulation Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x61|0x62}}|Set Subtitle Text|pre=unchanged}}
 +
{{PacketList|{{change|0x62|0x63}}|Update Time|pre=unchanged}}
 +
{{PacketList|{{change|0x63|0x64}}|Set Title Text|pre=unchanged}}
 +
{{PacketList|{{change|0x64|0x65}}|Set Title Animation Times|pre=unchanged}}
 +
{{PacketList|{{change|0x65|0x66}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x66|0x67}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x67|0x68}}|Start Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x68|0x69}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|0x6A|Store Cookie (Play)|rel=added}}
 +
{{PacketList|{{change|0x69|0x6B}}|System Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x6A|0x6C}}|Set Tab List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x6B|0x6D}}|Tag Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x6C|0x6E}}|Pickup Item|pre=unchanged}}
 +
{{PacketList|{{change|0x6D|0x6F}}|Teleport Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x6E|0x70}}|Set Ticking State|pre=unchanged}}
 +
{{PacketList|{{change|0x6F|0x71}}|Step Tick|pre=unchanged}}
 +
{{PacketList|0x72|Transfer (Play)|rel=added}}
 +
{{PacketList|{{change|0x70|0x73}}|Update Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x71|0x74}}|Update Attributes}}
 +
{{PacketList|{{change|0x72|0x75}}|Entity Effect}}
 +
{{PacketList|{{change|0x73|0x76}}|Update Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x74|0x77}}|Update Tags (play)|pre=unchanged}}
 +
|-
 +
!colspan="4"| Play serverbound
 +
{{PacketList|0x10|Cookie Response (play)|rel=added}}
 +
{{PacketList|{{change|0x10|0x11}}|Serverbound Plugin Message (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x11|0x12}}|Edit Book|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x13}}|Query Entity Tag|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Interact|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Jigsaw Generate|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Serverbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Lock Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Set Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Set Player Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Set Player Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Set Player On Ground|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Paddle Boat|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Pick Item|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Ping Request (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Place Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x22}}|Player Action|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Player Command|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Player Input|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x25}}|Pong (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Change Recipe Book Settings|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x27}}|Set Seen Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Rename Item|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Resource Pack Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Seen Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Select Trade|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Set Beacon Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Program Command Block|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Program Command Block Minecart|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Set Creative Mode Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Program Jigsaw Block|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Program Structure Block|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Update Sign|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Swing Arm|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Teleport To Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Use Item On|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Use Item|pre=unchanged}}
 
  |}
 
  |}
  
 
== New/modified data types ==
 
== New/modified data types ==
  
=== Chunk Section ===
+
No changes so far.
  
The data section of the packet contains most of the useful data for the chunk.
+
== Entity Metadata ==
  
{| class="wikitable"
+
{{#vardefine: meta_prerelease | 1}}
|-
+
 
! Field Name
+
{{Metadata type definition/begin}}
  ! Field Type
+
  ! Value
 
  ! Notes
 
  ! Notes
  |-
+
{{Metadata type definition|Byte}}
  | Data
+
| {{Type|Byte}}
  | Array of [[#Chunk Section structure|Chunk Section]]
+
|
  | The number of elements in the array is {{change|equal to the number of bits set in Primary Bit Mask|calculated based on the world's height}}. Sections are sent bottom-to-top{{change|, i.e. the first section, if sent, extends from Y=0 to Y=15|}}.
+
{{Metadata type definition|VarInt}}
 +
| {{Type|VarInt}}
 +
|
 +
{{Metadata type definition|VarLong}}
 +
| {{Type|VarLong}}
 +
|
 +
{{Metadata type definition|Float}}
 +
| {{Type|Float}}
 +
|
 +
{{Metadata type definition|String}}
 +
| {{Type|String}}
 +
|
 +
{{Metadata type definition|Text Component}}
 +
  | {{Type|Text Component}}
 +
  |
 +
{{Metadata type definition|Optional Text Component}}
 +
  | ({{Type|Boolean}}, {{Type|Optional}} {{Type|Text Component}})
 +
  | Text Component is present if the Boolean is set to true.
 +
{{Metadata type definition|Slot}}
 +
| {{Type|Slot}}
 +
|
 +
{{Metadata type definition|Boolean}}
 +
| {{Type|Boolean}}
 +
|
 +
{{Metadata type definition|Rotations}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| rotation on x, rotation on y, rotation on z
 +
{{Metadata type definition|Position}}
 +
| {{Type|Position}}
 +
|
 +
{{Metadata type definition|Optional Position}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Position}})
 +
| Position is present if the Boolean is set to true.
 +
{{Metadata type definition|Direction}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
 +
{{Metadata type definition|Optional UUID}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|UUID}})
 +
| UUID is present if the Boolean is set to true.
 +
{{Metadata type definition|Block State}}
 +
| {{Type|VarInt}}
 +
| An ID in the block state registry.
 +
{{Metadata type definition|Optional Block State}}
 +
| {{Type|VarInt}}
 +
| 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
 +
{{Metadata type definition|NBT}}
 +
| {{Type|NBT}}
 +
|
 +
{{Metadata type definition|Particle}}
 +
| ({{Type|VarInt}}, Varies)
 +
| particle type (an ID in the <code>minecraft:particle_type</code> registry), particle data (See [[Particles]].)
 +
{{Metadata type definition|Villager Data}}
 +
| ({{Type|VarInt}}, {{Type|VarInt}}, {{Type|VarInt}})
 +
| villager type, villager profession, level (See below.)
 +
{{Metadata type definition|Optional VarInt}}
 +
| {{Type|VarInt}}
 +
| 0 for absent; 1 + actual value otherwise. Used for entity IDs.
 +
{{Metadata type definition|Pose}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14{{change||2=, SLIDING = 15, SHOOTING = 16, INHALING = 17}}
 +
{{Metadata type definition|Cat Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:cat_variant</code> registry.
 +
{{Metadata type definition|Frog Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:frog_variant</code> registry.
 +
{{Metadata type definition|Optional Global Position}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Identifier}}, {{Type|Optional}} {{Type|Position}})
 +
| dimension identifier, position; only if the Boolean is set to true.
 +
{{Metadata type definition|Painting Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:painting_variant</code> registry.
 +
{{Metadata type definition|Sniffer State}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
 +
{{Metadata type definition|Armadillo State|rel=added}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| IDLE = 0, ROLLING = 1, SCARED = 2
 +
{{Metadata type definition|Vector3}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| x, y, z
 +
{{Metadata type definition|Quaternion}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| x, y, z, w
 
  |}
 
  |}
  
==== Chunk Section structure ====
+
=== Armadillo ===
  
A Chunk Section is defined in terms of other [[data types]]. A Chunk Section consists of the following fields:
+
{{Metadata inherit|Armadillo|inherits=Animal|start_at=17}}
 
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
! Field Name
+
  | {{Metadata id|added}}
! Field Type
+
  | {{Metadata type|Armadillo State}}
! Notes
+
  |colspan="2"| Armadillo State
|-
+
  | IDLE
| Block count
 
| Short
 
  | Number of non-air blocks present in the chunk section. "Non-air" is defined as any block other than air, cave air, and void air (in particular, note that fluids such as water are still counted). The client uses this to unload chunks empty chunks. It will keep count of the blocks as they are broken/placed and if this integer reaches 0 the whole chunk section is not rendered, even though there may still be blocks left, if the server sends an incorrect block count.
 
|- {{removed}}
 
| Bits Per Block
 
| Unsigned Byte
 
| Determines how many bits are used to encode a block. Note that not all numbers are valid here.
 
|- {{removed}}
 
  | Palette
 
| Varies
 
| See below for the format.
 
|- {{removed}}
 
| Data Array Length
 
| VarInt
 
| Number of longs in the following array
 
|- {{removed}}
 
  | Data Array
 
| Array of Long
 
| Compacted list of 4096 (16x16x16) indices pointing to state IDs in the Palette (see [[#Compacted data array|Compacted data array]])
 
|- {{added}}
 
| Block states
 
| [[#Paletted Container structure|Paletted Container]]
 
| Consists of 4096 entries, representing all the blocks in the chunk section
 
|- {{added}}
 
| Biomes
 
| [[#Paletted Container structure|Paletted Container]]
 
  | Consists of 64 entries, representing 4x4x4 biome regions in the chunk section
 
 
  |}
 
  |}
  
==== {{change||Paletted Container structure}} ====
+
== Block Actions ==
 +
 
 +
No changes so far.
  
{{change||A Paletted Container is a palette-based storage of entries. Paletted Containers have an associated global palette (either block states or biomes as of now), where values are mapped from. A Paletted Container consists of the following fields:}}
+
== Inventories ==
  
{| class="wikitable"
+
No changes so far.
|- {{added}}
 
! Field Name
 
! Field Type
 
! Notes
 
|- {{added}}
 
| Bits Per Entry
 
| Unsigned Byte
 
| Determines how many bits are used to encode entries. Note that not all numbers are valid here.
 
|- {{added}}
 
| Palette
 
| Varies
 
| See below for the format.
 
|- {{added}}
 
| Data Array Length
 
| VarInt
 
| Number of longs in the following array
 
|- {{added}}
 
| Data Array
 
| Array of Long
 
| Compacted list of indices pointing to entry IDs in the Palette. When Bits Per Entry is 0, this array is empty (see [[#Single valued|Single valued palette]])
 
|}
 
  
{{change||Data Array is given for each entry with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates.}}
+
== Plugin Channels ==
  
===== Palettes =====
+
No changes so far.
  
The bits per {{change|block|entry}} value determines what format is used for the palette. In most cases, invalid values will be interpreted as a different value when parsed by the notchian client, meaning that chunk data will be parsed incorrectly if you use an invalid bits per {{change|block|entry}}. Servers must make sure that the bits per {{change|block|entry}} value is correct. {{change||There are currently three types of palettes:}}
+
== Handshake ==
  
====== {{change||Single valued}} ======
+
=== Serverbound ===
  
{{change||This format is used when bits per entry is equal to 0, and signifies that the palette contains a single value. When this palette is used, the Data Array sent/received is empty, since entries can be inferred from the palette's single value.}}
+
==== Handshake ====
  
{{change||The format is as follows:}}
+
This causes the server to switch into the target state.
  
 
{| class="wikitable"
 
{| class="wikitable"
  |- {{added}}
+
  ! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |- {{added}}
+
  |-
  | Value
+
  | rowspan="4"| 0x00
  | VarInt
+
| rowspan="4"| Handshaking
  | ID of the corresponding entry in its global palette
+
| rowspan="4"| Server
 +
| Protocol Version
 +
  | [[#Definitions:varint|VarInt]]
 +
  | See [[protocol version numbers]] (currently 765 in Minecraft 1.20.4).
 +
|-
 +
| Server Address
 +
| [[#Definitions:string|String]] (255)
 +
| Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide example.org as server address in addition to connecting to it.
 +
|-
 +
| Server Port
 +
| [[#Definitions:unsigned-short|Unsigned Short]]
 +
| Default is 25565. The Notchian server does not use this information.
 +
|-
 +
| Next State
 +
| [[#Definitions:varint|VarInt]] [[#Definitions:enum|Enum]]
 +
| 1 for [[#Status|Status]], 2 for [[#Login|Login]]{{change||, 3 for [[#Login|Transfer]]}}.
 
  |}
 
  |}
  
====== Indirect ======
+
== Status ==
  
There are {{change|two|three}} variants of this:
+
=== Clientbound ===
  
* For {{change||block states and }}bits per {{change|block|entry}} <= 4, 4 bits are used to represent a block.
+
No changes so far.
* For {{change||block states and }}bits per block between 5 and 8, the given value is used.
 
* For biomes and bits per entry <= 3, the given value is used.
 
  
This is an actual palette which lists the {{change|block states|entries}} used. Values in the chunk section's data array are indices into the palette, which in turn gives a proper {{change|block state|entry}}.
+
=== Serverbound ===
  
The format is as follows:
+
No changes so far.
 +
 
 +
== Login ==
  
{| class="wikitable"
+
=== Clientbound ===
|-
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| Palette Length
 
| VarInt
 
| Number of elements in the following array.
 
|-
 
| Palette
 
| Array of VarInt
 
| Mapping of {{change|block state|entry}} IDs in the global palette to indices of this array
 
|}
 
  
====== Direct ======
+
==== Cookie Request (login) ====
  
This format is used for bits per {{change|block|entry}} values greater than or equal to {{change|9|a threshold (9 for block states, 4 for biomes)}}. The number of bits used to represent {{change|a block|an entry}} is the base 2 logarithm of the number of {{change|block states|entries in the global palette}}, rounded up. For the current vanilla release, this is 15 bits {{change|per block|per entry for block states, and 6 bits per entry for biomes}}.
+
Requests a cookie that was previously stored.
  
The "palette" uses the following format:
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
  ! Packet ID
  |-
+
! State
  ! Field Name
+
! Bound To
  ! Field Type
+
  ! colspan="2"| Field Name
 +
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |colspan="3"| ''no fields''
+
| rowspan="1"| 0x05
 +
| rowspan="1"| Login
 +
| rowspan="1"| Client
 +
  | colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 
  |}
 
  |}
  
== Entity Metadata ==
+
=== Serverbound ===
  
No changes so far.
+
==== Cookie Response (login) ====
  
=== Entity ===
+
Response to a [[#Cookie_Request_(login)|Cookie Request (login)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
  
No changes so far.
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x04
 +
| rowspan="3"| Login
 +
| rowspan="3"| Server
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Has Payload
 +
| colspan="2"| Boolean
 +
| The payload is only present if the cookie exists on the client.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| Optional ByteArray(5120)
 +
| The data of the cookie, if any.
 +
|}
  
== Block Actions ==
+
== Configuration ==
  
No changes so far.
+
=== Clientbound ===
  
== Inventories ==
+
==== Cookie Request (configuration) ====
  
No changes so far.
+
Requests a cookie that was previously stored.
  
== Plugin Channels ==
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="1"| 0x00
 +
| rowspan="1"| Configuration
 +
| rowspan="1"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|}
  
No changes so far.
+
==== Store Cookie (configuration) ====
  
== Play ==
+
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
  
=== Clientbound ===
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="2"| 0x09
 +
| rowspan="2"| Configuration
 +
| rowspan="2"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| ByteArray(5120)
 +
| The data of the cookie.
 +
|}
  
==== Block Entity Data ====
+
==== Transfer (configuration) ====
  
Sets the block entity associated with the block at the given location.
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  ! colspan="2"| Field Name
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x0A
+
  | rowspan="2"| 0x0A
  |rowspan="4"| Play
+
  | rowspan="2"| Configuration
  |rowspan="4"| Client
+
  | rowspan="2"| Client
  | Location
+
  | colspan="2"| Host
| Position
+
  | colspan="2"| String
  |  
+
  | The hostname of IP of the server.
|- {{removed}}
 
| Action
 
| Unsigned Byte
 
  | The type of update to perform, see below.
 
|- {{added}}
 
| Type
 
| VarInt
 
| The type of block entity
 
 
  |-
 
  |-
  | NBT Data
+
  | colspan="2"| Port
  | [[NBT|NBT Tag]]
+
  | colspan="2"| VarInt
  | Data to set.  May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal).
+
  | The port of the server.
 
  |}
 
  |}
  
==== Chunk Data and Update Light ====
+
=== Serverbound ===
{{Main|Chunk Format}}
 
{{See also|#Unload Chunk}}
 
  
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
+
==== Cookie Response (configuration) ====
  
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimension the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
+
Response to a [[#Cookie_Request_(configuration)|Cookie Request (configuration)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! colspan="2"| Field Name
  !colspan="2"| Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="32"| {{change|0x20|0x22}}
+
  | rowspan="3"| 0x01
  |rowspan="32"| Play
+
  | rowspan="3"| Configuration
  |rowspan="32"| Client
+
  | rowspan="3"| Server
|colspan="2"| Chunk X
+
  | colspan="2"| Key
|colspan="2"| Int
+
  | colspan="2"| Identifier
| Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | The identifier of the cookie.
|-
 
|colspan="2"| Chunk Z
 
|colspan="2"| Int
 
| Chunk coordinate (block coordinate divided by 16, rounded down)
 
|- {{removed}}
 
|colspan="2"| Bit Mask Length
 
|colspan="2"| VarInt
 
| Length of the following array
 
|- {{removed}}
 
|colspan="2"| Primary Bit Mask
 
|colspan="2"| Array of Long
 
| BitSet with bits (world height in blocks / 16) set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from the lowest y to 15 blocks above).
 
|-
 
  |colspan="2"| Heightmaps
 
  |colspan="2"| [[NBT]]
 
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries{{change| at 9 bits per entry totaling 36 longs|, with the number of bits per entry varying depending on the world's height, defined by the formula <code>ceil(log2(height + 1))</code>}}). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 
|- {{removed}}
 
|colspan="2"| Biomes length
 
|colspan="2"| VarInt
 
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 
|- {{removed}}
 
|colspan="2"| Biomes
 
|colspan="2"| Array of VarInt
 
| 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  {{change|Not present if full chunk is false.|}}  See [[Chunk Format#Biomes|Chunk Format § Biomes]].
 
|-
 
|colspan="2"| Size
 
|colspan="2"| VarInt
 
| Size of Data in bytes
 
 
  |-
 
  |-
  |colspan="2"| Data
+
  | colspan="2"| Has Payload
  |colspan="2"| Byte array
+
  | colspan="2"| Boolean
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
+
  | The payload is only present if the cookie exists on the client.
 
  |-
 
  |-
  |colspan="2"| Number of block entities
+
  | colspan="2"| Payload
|colspan="2"| VarInt
+
  | colspan="2"| Optional ByteArray(5120)
| Number of elements in the following array
+
  | The data of the cookie, if any.
|- {{removed}}
 
|colspan="2"| Block entities
 
  |colspan="2"| Array of [[NBT|NBT Tag]]
 
| All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
|- {{added}}
 
|rowspan="4" | Block Entity
 
| Packed XZ
 
|rowspan="4" | Array
 
| Byte
 
| The packed section coordinates, calculated from ((blockX & 15) << 4) | (blockZ & 15)
 
|- {{added}}
 
| Y
 
| Short
 
| The height relative to the world
 
|- {{added}}
 
| Type
 
| VarInt
 
  | The type of block entity
 
|- {{added}}
 
| Data
 
| [[NBT]]
 
| The block entity's data, without the X, Y, and Z values
 
|- {{added}}
 
|colspan="2"| Trust Edges
 
|colspan="2"| Boolean
 
| If edges should be trusted for light updates.
 
|- {{added}}
 
|colspan="2"| Length 1
 
|colspan="2"| VarInt
 
| Length of the following array
 
|- {{added}}
 
|colspan="2"| Sky Light Mask
 
|colspan="2"| Array of Long
 
| BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
 
|- {{added}}
 
|colspan="2"| Length 2
 
|colspan="2"| VarInt
 
| Length of the following array
 
|- {{added}}
 
|colspan="2"| Block Light Mask
 
|colspan="2"| Array of Long
 
| BitSet containing bits for each sections in the world + 2, same order as sky light
 
|- {{added}}
 
|colspan="2"| Length 3
 
|colspan="2"| VarInt
 
| Length of the following array
 
|- {{added}}
 
|colspan="2"| Empty Sky Light Mask
 
|colspan="2"| Array of Long
 
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
 
|- {{added}}
 
|colspan="2"| Length 4
 
|colspan="2"| VarInt
 
| Length of the following array
 
|- {{added}}
 
|colspan="2"| Empty Block Light Mask
 
|colspan="2"| Array of Long
 
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
 
|- {{added}}
 
|colspan="2"| Sky Light array count
 
|colspan="2"| VarInt
 
| Number of entries in the following array
 
|- {{added}}
 
|rowspan="2"| Sky Light arrays
 
| Length
 
|rowspan="2"| Array
 
| VarInt
 
| Length of the following array in bytes (always 2048)
 
|- {{added}}
 
| Sky Light array
 
| Array of 2048 bytes
 
| There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 
|- {{added}}
 
|colspan="2"| Block Light array count
 
|colspan="2"| VarInt
 
| Number of entries in the following array
 
|- {{added}}
 
|rowspan="2"| Block Light arrays
 
| Length
 
|rowspan="2"| Array
 
| VarInt
 
| Length of the following array in bytes (always 2048)
 
|- {{added}}
 
| Block Light array
 
| Array of 2048 bytes
 
| There is 1 array for each bit set to true in the block light mask, starting with the lowest value.  Half a byte per light value.
 
 
  |}
 
  |}
  
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
+
== Play ==
  
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
+
=== Clientbound ===
  
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
+
==== Cookie Request (play) ====
  
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
+
Requests a cookie that was previously stored.
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
 
  
==== Join Game ====
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="1"| 0x16
 +
| rowspan="1"| Play
 +
| rowspan="1"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|}
  
See [[Protocol Encryption]] for information on logging in.
+
==== Store Cookie (play) ====
  
{| class="wikitable"
+
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
 +
 
 +
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  ! colspan="2"| Field Name
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="17"| 0x26
+
  | rowspan="2"| 0x6A
  |rowspan="17"| Play
+
  | rowspan="2"| Play
  |rowspan="17"| Client
+
  | rowspan="2"| Client
  | Entity ID
+
  | colspan="2"| Key
| Int
+
  | colspan="2"| Identifier
| The player's Entity ID (EID).
+
  | The identifier of the cookie.
|-
 
| Is hardcore
 
| Boolean
 
|
 
|-
 
| Gamemode
 
| Unsigned Byte
 
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
 
|-
 
  | Previous Gamemode
 
| Byte
 
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. Defaults to -1 if there is no previous gamemode. (More information needed)
 
|-
 
| World Count
 
| VarInt
 
| Size of the following array.
 
|-
 
| World Names
 
| Array of Identifier
 
| Identifiers for all worlds on the server.
 
|-
 
| Dimension Codec
 
| [[NBT|NBT Tag Compound]]
 
  | The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
 
|-
 
| Dimension
 
| [[NBT|NBT Tag Compound]]
 
| Valid dimensions are defined per dimension registry sent before this. The structure of this tag is a dimension type (see below).
 
|-
 
| World Name
 
| Identifier
 
| Name of the world being spawned into.
 
 
  |-
 
  |-
  | Hashed seed
+
  | colspan="2"| Payload
| Long
+
  | colspan="2"| ByteArray(5120)
  | First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
+
  | The data of the cookie.
|-
 
| Max Players
 
| VarInt
 
| Was once used by the client to draw the player list, but now is ignored.
 
|-
 
| View Distance
 
| VarInt
 
| Render distance (2-32).
 
|- {{added}}
 
| Simulation Distance
 
| VarInt
 
  | The distance that the client will process specific things, such as entities.
 
|-
 
| Reduced Debug Info
 
| Boolean
 
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 
|-
 
| Enable respawn screen
 
| Boolean
 
| Set to false when the doImmediateRespawn gamerule is true.
 
|-
 
| Is Debug
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks.
 
|-
 
| Is Flat
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63.
 
 
  |}
 
  |}
  
 +
==== Transfer (play) ====
  
The '''Dimension Codec''' NBT Tag Compound ([https://gist.githubusercontent.com/BomBardyGamer/c075a7a34b51f2df9d5aabdd2a762f4f/raw/c7352784dfadbca00d2282aeca04ed80081bfb09/dimension_codec.snbt Default value in SNBT]) includes two registries: "minecraft:dimension_type" and "minecraft:worldgen/biome".
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
  !Name
+
  ! Packet ID
  !Type
+
! State
  !style="width: 250px;" colspan="2"| Notes
+
  ! Bound To
 +
  ! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | minecraft:dimension_type
+
  | rowspan="2"| 0x72
  | TAG_Compound
+
| rowspan="2"| Play
  | The dimension type registry (see below).
+
| rowspan="2"| Client
 +
  | colspan="2"| Host
 +
| colspan="2"| String
 +
  | The hostname of IP of the server.
 
  |-
 
  |-
  | minecraft:worldgen/biome
+
  | colspan="2"| Port
  | TAG_Compound
+
  | colspan="2"| VarInt
  | The biome registry (see below).
+
  | The port of the server.
 
  |}
 
  |}
  
Dimension type registry:
+
==== Update Attributes ====
 +
 
 +
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
  !Name
+
  ! Packet ID
  !Type
+
! State
  !style="width: 250px;" colspan="2"| Notes
+
! Bound To
 +
! colspan="2"| Field Name
 +
  ! colspan="2"| Field Type
 +
  ! Notes
 +
|-
 +
| rowspan="6"| 0x71
 +
| rowspan="6"| Play
 +
| rowspan="6"| Client
 +
| colspan="2"| Entity ID
 +
| colspan="2"| VarInt
 +
|
 
  |-
 
  |-
  | type
+
  | colspan="2"| Number Of Properties
  | TAG_String
+
  | colspan="2"| VarInt
  | The name of the registry. Always "minecraft:dimension_type".
+
  | Number of elements in the following array.
 
  |-
 
  |-
  | value
+
  | rowspan="4"| Property
  | TAG_List
+
  | {{change|Key|Id}}
| List of dimension types registry entries (see below).
+
| rowspan="4"| Array
|}
+
  | {{change|Identifier|VarInt Enum}}
 
+
  | See below.
Dimension type registry entry:
 
 
 
{| class="wikitable"
 
  !Name
 
!Type
 
  !style="width: 250px;" colspan="2"| Notes
 
 
  |-
 
  |-
  | name
+
  | Value
  | TAG_String
+
  | Double
  | The name of the dimension type (for example, "minecraft:overworld").
+
  | See below.
 
  |-
 
  |-
  | id
+
  | Number Of Modifiers
  | TAG_Int
+
  | VarInt
  | The protocol ID of the dimension (matches the index of the element in the registry list).
+
  | Number of elements in the following array.
 
  |-
 
  |-
  | element
+
  | Modifiers
  | TAG_Compound
+
  | Array of Modifier Data
  | The dimension type (see below).
+
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 
  |}
 
  |}
  
Dimension type:
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
  
 
{| class="wikitable"
 
{| class="wikitable"
! Name
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Values
 
 
  |-
 
  |-
  | piglin_safe
+
  ! Id
  | TAG_Byte
+
  ! Key
  |colspan="2"| Whether piglins shake and transform to zombified piglins.
+
  ! Default
  | 1: true, 0: false.
+
  ! Min
 +
! Max
 +
! Label
 
  |-
 
  |-
  | natural
+
  | 0
  | TAG_Byte
+
  | generic.armor
  |colspan="2"| When false, compasses spin randomly. When true, nether portals can spawn zombified piglins.
+
  | 0.0
  | 1: true, 0: false.
+
| 0.0
 +
| 30.0
 +
  | Armor.
 
  |-
 
  |-
  | ambient_light
+
  | 1
  | TAG_Float
+
  | generic.armor_toughness
  |colspan="2"| How much light the dimension has.
+
  | 0.0
  | 0.0 to 1.0.
+
  | 0.0
 +
| 20.0
 +
| Armor Toughness.
 
  |-
 
  |-
  | fixed_time
+
  | 2
  | Optional TAG_Long
+
  | generic.attack_damage
  |colspan="2"| If set, the time of the day is the specified value.
+
  | 2.0
  | If set, 0 to 24000.
+
| 0.0
 +
  | 2048.0
 +
| Attack Damage.
 
  |-
 
  |-
  | infiniburn
+
  | 3
  | TAG_String
+
  | generic.attack_knockback
  |colspan="2"| A resource location defining what block tag to use for infiniburn.
+
  | 0.0
  | "" or minecraft resource "minecraft:...".
+
| 0.0
 +
  | 5.0
 +
| Attack Knockback.
 
  |-
 
  |-
  | respawn_anchor_works
+
  | 4
  | TAG_Byte
+
  | generic.attack_speed
  |colspan="2"| Whether players can charge and use respawn anchors.
+
| 4.0
  | 1: true, 0: false.
+
| 0.0
 +
| 1024.0
 +
| Attack Speed.
 +
|- {{added}}
 +
| 5
 +
| generic.block_interaction_range
 +
| 4.5
 +
  | 0.0
 +
| 64.0
 +
| Block Interaction Range.
 +
  |- {{added}}
 +
| 6
 +
| generic.entity_interaction_range
 +
| 3.0
 +
| 0.0
 +
| 64.0
 +
| Entity Interaction Range.
 
  |-
 
  |-
  | has_skylight
+
  | 7
  | TAG_Byte
+
  | generic.flying_speed
  |colspan="2"| Whether the dimension has skylight access or not.
+
  | 0.4
  | 1: true, 0: false.
+
| 0.0
 +
  | 1024.0
 +
| Flying Speed.
 
  |-
 
  |-
  | bed_works
+
  | 8
  | TAG_Byte
+
  | generic.follow_range
  |colspan="2"| Whether players can use a bed to sleep.
+
  | 32.0
  | 1: true, 0: false.
+
| 0.0
 +
  | 2048.0
 +
| Follow Range.
 
  |-
 
  |-
  | effects
+
  | 9
  | TAG_String
+
  | horse.jump_strength
  |colspan="2"| ?
+
| 0.7
  | "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else.
+
| 0.0
 +
  | 2.0
 +
  | Jump Strength.
 
  |-
 
  |-
  | has_raids
+
  | 10
  | TAG_Byte
+
  | generic.knockback_resistance
  |colspan="2"| Whether players with the Bad Omen effect can cause a raid.
+
  | 0.0
  | 1: true, 0: false.
+
| 0.0
 +
  | 1.0
 +
| Knockback Resistance.
 
  |-
 
  |-
  | min_y
+
  | 11
  | TAG_Int
+
  | generic.luck
  |colspan="2"| The minimum Y level.
+
  | 0.0
  |
+
| -1024.0
 +
  | 1024.0
 +
| Luck.
 
  |-
 
  |-
  | height
+
  | 12
  | TAG_Int
+
  | generic.max_absorption
  |colspan="2"| The maximum height.
+
  | 0.0
  |
+
| 0.0
 +
  | 2048.0
 +
| Max Absorption.
 
  |-
 
  |-
  | logical_height
+
  | 13
  | TAG_Int
+
  | generic.max_health
  |colspan="2"| The maximum height to which chorus fruits and nether portals can bring players within this dimension.
+
  | 20.0
  | 0-256.
+
| 1.0
 +
  | 1024.0
 +
| Max Health.
 
  |-
 
  |-
  | coordinate_scale
+
  | 14
  | TAG_Float
+
  | generic.movement_speed
  |colspan="2"| The multiplier applied to coordinates when traveling to the dimension.
+
  | 0.7
  | 0.00001 - 30000000.0
+
| 0.0
 +
  | 1024.0
 +
| Movement Speed.
 +
|- {{added}}
 +
| 15
 +
| generic.scale
 +
| 1.0
 +
| 0.0625
 +
| 16.0
 +
| Scale.
 
  |-
 
  |-
  | ultrawarm
+
  | 16
  | TAG_Byte
+
  | zombie.spawn_reinforcements
  |colspan="2"| Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner.
+
  | 0.0
  | 1: true, 0: false.
+
| 0.0
  |-
+
  | 1.0
  | has_ceiling
+
| Spawn Reinforcements Chance.
  | TAG_Byte
+
  |- {{added}}
  |colspan="2"| Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster.
+
  | 17
  | 1: true, 0: false.
+
  | generic.step_height
 +
  | 0.6
 +
| 0.0
 +
| 10.0
 +
  | Step Height.
 
  |}
 
  |}
  
Biome registry:
+
''Modifier Data'' structure:
  
 
{| class="wikitable"
 
{| class="wikitable"
!Name
 
!Type
 
!style="width: 250px;" colspan="2"| Notes
 
 
  |-
 
  |-
  | type
+
! Field Name
  | TAG_String
+
! Field Type
  | The name of the registry. Always "minecraft:worldgen/biome".
+
! Notes
 +
|-
 +
| UUID
 +
| UUID
 +
|
 +
|-
 +
  | Amount
 +
  | Double
 +
  | May be positive or negative.
 
  |-
 
  |-
  | value
+
  | Operation
  | TAG_List
+
  | Byte
  | List of biome registry entries (see below).
+
  | See below.
 
  |}
 
  |}
  
Biome registry entry:
+
The operation controls how the base value of the modifier is changed.
 +
 
 +
* 0: Add/subtract amount
 +
* 1: Add/subtract amount percent of the current value
 +
* 2: Multiply by amount percent
  
{| class="wikitable"
+
All of the 0's are applied first, and then the 1's, and then the 2's.
!Name
 
!Type
 
!style="width: 250px;" colspan="2"| Notes
 
|-
 
| name
 
| TAG_String
 
| The name of the biome (for example, "minecraft:ocean").
 
|-
 
| id
 
| TAG_Int
 
| The protocol ID of the biome (matches the index of the element in the registry list).
 
|-
 
| element
 
| TAG_Compound
 
| The biome properties (see below).
 
|}
 
  
Biome properties:
+
==== Entity Effect ====
  
 
{| class="wikitable"
 
{| class="wikitable"
  !colspan="2"|Name
+
  ! Packet ID
  !colspan="2"|Type
+
! State
  !style="width: 250px;" colspan="2"| Meaning
+
! Bound To
  !colspan="2"|Values
+
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  |colspan="2"|precipitation
+
  | rowspan="7"| 0x72
  |colspan="2"|TAG_String
+
  | rowspan="7"| Play
  |colspan="2"| The type of precipitation in the biome.
+
  | rowspan="7"| Client
  |colspan="2"|"rain", "snow", or "none".
+
  | Entity ID
 +
| VarInt
 +
|
 
  |-
 
  |-
  |colspan="2"| depth
+
  | Effect ID
  |colspan="2"| TAG_Float
+
  | VarInt
  |colspan="2"| The depth factor of the biome.
+
  | See {{Minecraft Wiki|Status effect#Effect list|this table}}.
|colspan="2"| The default values vary between 1.5 and -1.8.
 
 
  |-
 
  |-
  |colspan="2"| temperature
+
  | Amplifier
  |colspan="2"| TAG_Float
+
  | Byte
  |colspan="2"| The temperature factor of the biome.
+
  | Notchian client displays effect level as Amplifier + 1.
|colspan="2"| The default values vary between 2.0 and -0.5.
 
 
  |-
 
  |-
  |colspan="2"| scale
+
  | Duration
  |colspan="2"| TAG_Float
+
  | VarInt
  |colspan="2"| ?
+
  | Duration in ticks. (-1 for infinite)
|colspan="2"| The default values vary between 1.225 and 0.0.
 
 
  |-
 
  |-
  |colspan="2"| downfall
+
  | Flags
  |colspan="2"| TAG_Float
+
| Byte
|colspan="2"| ?
+
| Bit field, see below.
  |colspan="2"| The default values vary between 1.0 and 0.0.
+
|- {{removed}}
 +
| Has Factor Data
 +
| Boolean
 +
| Used in DARKNESS effect
 +
|- {{removed}}
 +
| Factor Codec
 +
| NBT Tag
 +
| See below
 +
  |}
 +
 
 +
{{Need Info|What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?}}
 +
 
 +
Within flags:
 +
 
 +
* 0x01: Is ambient - was the effect spawned from a beacon?  All beacon-generated effects are ambient.  Ambient effects use a different icon in the HUD (blue border rather than gray).  If all effects on an entity are ambient, the [[Entity_metadata#Living Entity|"Is potion effect ambient" living metadata field]] should be set to true.  Usually should not be enabled.
 +
* 0x02: Show particles - should all particles from this effect be hidden?  Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory).  Usually should be enabled.
 +
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
 +
* {{change||0x08: Blend - should the effect's hard-coded blending be applied?  Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.}}
 +
 
 +
{{change|Factor Data|}}
 +
{| class="wikitable" {{removed}}
 +
!Name
 +
!Type
 +
  !style="width: 250px;" colspan="2"| Notes
 
  |-
 
  |-
  |colspan="2"| category
+
  | padding_duration
  |colspan="2"| TAG_String
+
  | TAG_INT
  |colspan="2"| The category of the biome.
+
  |
|colspan="2"| Known values are "ocean", "plains", "desert", "forest", "extreme_hills", "taiga", "swamp", "river", "nether", "the_end", "icy", "mushroom", "beach", "jungle", "mesa", "savanna", and "none".
 
 
  |-
 
  |-
  |colspan="2"| temperature_modifier
+
  | factor_start
  |colspan="2"| Optional TAG_String
+
  | TAG_FLOAT
  |colspan="2"| ?
+
  |
|colspan="2"| The only known value is "frozen".
 
 
  |-
 
  |-
  |rowspan="11"| effects
+
  | factor_target
| sky_color
+
  | TAG_FLOAT
|rowspan="11"| TAG_Compound
+
  |
| TAG_Int
 
  |colspan="2"| The color of the sky.
 
  | Example: 8364543, which is #7FA1FF in RGB.
 
 
  |-
 
  |-
  | water_fog_color
+
  | factor_current
  | TAG_Int
+
  | TAG_FLOAT
  |colspan="2"| Possibly the tint color when swimming.
+
  |
| Example: 8364543, which is #7FA1FF in RGB.
 
|-
 
| fog_color
 
| TAG_Int
 
|colspan="2"| Possibly the color of the fog effect when looking past the view distance.
 
| Example: 8364543, which is #7FA1FF in RGB.
 
|-
 
| water_color
 
| TAG_Int
 
|colspan="2"| The tint color of the water blocks.
 
| Example: 8364543, which is #7FA1FF in RGB.
 
 
  |-
 
  |-
  | foliage_color
+
  | effect_changed_timestamp
  | Optional TAG_Int
+
  | TAG_INT
|colspan="2"| The tint color of the grass.
 
| Example: 8364543, which is #7FA1FF in RGB.
 
|-
 
| grass_color
 
| Optional TAG_Int
 
| colspan="2"| ?
 
| Example: 8364543, which is #7FA1FF in RGB.
 
 
  |-
 
  |-
  | grass_color_modifier
+
  | factor_previous_frame
| Optional TAG_String
 
|colspan="2"| Unknown, likely affects foliage color.
 
| If set, known values are "swamp" and "dark_forest".
 
|-
 
| music
 
| Optional TAG_Compound
 
|colspan="2"| Music properties for the biome.
 
| If present, contains the fields: replace_current_music (TAG_Byte), sound (TAG_String), max_delay (TAG_Int), min_delay (TAG_Int).
 
|-
 
| ambient_sound
 
| Optional TAG_String
 
|colspan="2"| Ambient soundtrack.
 
| If present, the ID of a soundtrack. Example: "minecraft:ambient.basalt_deltas.loop".
 
|-
 
| additions_sound
 
| Optional TAG_Compound
 
|colspan="2"| Additional ambient sound that plays randomly.
 
| If present, contains the fields: sound (TAG_String), tick_chance (TAG_Double).
 
|-
 
| mood_sound
 
| Optional TAG_Compound
 
|colspan="2"| Additional ambient sound that plays at an interval.
 
| If present, contains the fields: sound (TAG_String), tick_delay (TAG_Int), offset (TAG_Double), block_search_extent (TAG_Int).
 
|-
 
|rowspan="2"|particle
 
| probability
 
|rowspan="2"|Optional TAG_Compound
 
 
  | TAG_FLOAT
 
  | TAG_FLOAT
|rowspan="2"| Particles that appear randomly in the biome.
 
| Possibly the probability of spawning the particle.
 
| ?
 
 
  |-
 
  |-
  | options
+
  | had_effect_last_tick
  | TAG_COMPOUND
+
  | TAG_BOOLEAN
| The properties of the particle to spawn.
 
| Contains the field "type" (TAG_String), which identifies the particle type.
 
 
  |}
 
  |}
  
==== Update Simulation Distance ====
+
=== Serverbound ===
  
{| class="wikitable" {{Added}}
+
==== Cookie Response (play) ====
 +
 
 +
Response to a [[#Cookie_Request_(play)|Cookie Request (play)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
 +
 
 +
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  ! colspan="2"| Field Name
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0x26
+
  | rowspan="3"| 0x6A
  | Play
+
  | rowspan="3"| Play
  | Client
+
  | rowspan="3"| Server
  | Simulation Distance
+
| colspan="2"| Key
  | VarInt
+
| colspan="2"| Identifier
  | The distance that the client will process specific things, such as entities.
+
| The identifier of the cookie.
 +
|-
 +
  | colspan="2"| Has Payload
 +
  | colspan="2"| Boolean
 +
  | The payload is only present if the cookie exists on the client.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| Optional ByteArray(5120)
 +
| The data of the cookie, if any.
 
  |}
 
  |}
 
=== 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.
 
 
  
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 05:25, 26 February 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.4, protocol 765) to the current pre-release (currently 24w03b, protocol Snapshot 172). 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

ID Packet name Documentation
Handshake serverbound
0x00 Handshake Current Pre
Login clientbound
0x05 Cookie Request (login) Pre
Login serverbound
0x04 Cookie Response (login) Pre
Configuration clientbound
0x00 Cookie Request (configuration) Pre
0x00 0x01 Clientbound Plugin Message (configuration) Current (unchanged)
0x01 0x02 Disconnect (configuration) Current (unchanged)
0x02 0x03 Finish Configuration Current (unchanged)
0x03 0x04 Clientbound Keep Alive (configuration) Current (unchanged)
0x04 0x05 Ping (configuration) Current (unchanged)
0x05 0x06 Registry Data Current (unchanged)
0x06 0x07 Remove Resource Pack (configuration) Current (unchanged)
0x07 0x08 Add Resource Pack (configuration) Current (unchanged)
0x09 Store Cookie (configuration) Pre
0x0A Transfer (configuration) Pre
0x08 0x0B Feature Flags Current (unchanged)
0x09 0x0C Update Tags (configuration) Current (unchanged)
Configuration serverbound
0x01 Cookie Response (configuration) Pre
0x01 0x02 Serverbound Plugin Message (configuration) Current (unchanged)
0x02 0x03 Finish Configuration Current (unchanged)
0x03 0x04 Serverbound Keep Alive (configuration) Current (unchanged)
0x04 0x05 Pong (configuration) Current (unchanged)
0x05 0x06 Resource Pack Response (configuration) Current (unchanged)
Play clientbound
0x16 Cookie Request (Play) Pre
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Chat Suggestions Current (unchanged)
0x18 0x19 Clientbound Plugin Message (play) Current (unchanged)
0x19 0x1A Damage Event Current (unchanged)
0x1A 0x1B Delete Message Current (unchanged)
0x1B 0x1C Disconnect (play) Current (unchanged)
0x1C 0x1D Disguised Chat Message Current (unchanged)
0x1D 0x1E Entity Event Current (unchanged)
0x1E 0x1F Explosion Current (unchanged)
0x1F 0x20 Unload Chunk Current (unchanged)
0x20 0x21 Game Event Current (unchanged)
0x21 0x22 Open Horse Screen Current (unchanged)
0x22 0x23 Hurt Animation Current (unchanged)
0x23 0x24 Initialize World Border Current (unchanged)
0x24 0x25 Clientbound Keep Alive (play) Current (unchanged)
0x25 0x26 Chunk Data and Update Light Current (unchanged)
0x26 0x27 World Event Current (unchanged)
0x27 0x28 Particle Current (unchanged)
0x28 0x29 Update Light Current (unchanged)
0x29 0x2A Login (play) Current (unchanged)
0x2A 0x2B Map Data Current (unchanged)
0x2B 0x2C Merchant Offers Current (unchanged)
0x2C 0x2D Update Entity Position Current (unchanged)
0x2D 0x2E Update Entity Position and Rotation Current (unchanged)
0x2E 0x2F Update Entity Rotation Current (unchanged)
0x2F 0x30 Move Vehicle Current (unchanged)
0x30 0x31 Open Book Current (unchanged)
0x31 0x32 Open Screen Current (unchanged)
0x32 0x33 Open Sign Editor Current (unchanged)
0x33 0x34 Ping (play) Current (unchanged)
0x34 0x35 Ping Response (play) Current (unchanged)
0x35 0x36 Place Ghost Recipe Current (unchanged)
0x36 0x37 Player Abilities Current (unchanged)
0x37 0x38 Player Chat Message Current (unchanged)
0x38 0x39 End Combat Current (unchanged)
0x39 0x3A Enter Combat Current (unchanged)
0x3A 0x3B Combat Death Current (unchanged)
0x3B 0x3C Player Info Remove Current (unchanged)
0x3C 0x3D Player Info Update Current (unchanged)
0x3D 0x3E Look At Current (unchanged)
0x3E 0x3F Synchronize Player Position Current (unchanged)
0x3F 0x40 Update Recipe Book Current (unchanged)
0x40 0x41 Remove Entities Current (unchanged)
0x41 0x42 Remove Entity Effect Current (unchanged)
0x42 0x43 Reset Score Current (unchanged)
0x43 0x44 Remove Resource Pack (play) Current (unchanged)
0x44 0x45 Add Resource Pack (play) Current (unchanged)
0x45 0x46 Respawn Current (unchanged)
0x46 0x47 Set Head Rotation Current (unchanged)
0x47 0x48 Update Section Blocks Current (unchanged)
0x48 0x49 Select Advancements Tab Current (unchanged)
0x49 0x4A Server Data Current (unchanged)
0x4A 0x4B Set Action Bar Text Current (unchanged)
0x4B 0x4C Set Border Center Current (unchanged)
0x4C 0x4D Set Border Lerp Size Current (unchanged)
0x4D 0x4E Set Border Size Current (unchanged)
0x4E 0x4F Set Border Warning Delay Current (unchanged)
0x4F 0x50 Set Border Warning Distance Current (unchanged)
0x50 0x51 Set Camera Current (unchanged)
0x51 0x52 Set Held Item Current (unchanged)
0x52 0x53 Set Center Chunk Current (unchanged)
0x53 0x54 Set Render Distance Current (unchanged)
0x54 0x55 Set Default Spawn Position Current (unchanged)
0x55 0x56 Display Objective Current (unchanged)
0x56 0x57 Set Entity Metadata Current (unchanged)
0x57 0x58 Link Entities Current (unchanged)
0x58 0x59 Set Entity Velocity Current (unchanged)
0x59 0x5A Set Equipment Current (unchanged)
0x5A 0x5B Set Experience Current (unchanged)
0x5B 0x5C Set Health Current (unchanged)
0x5C 0x5D Update Objectives Current (unchanged)
0x5D 0x5E Set Passengers Current (unchanged)
0x5E 0x5F Update Teams Current (unchanged)
0x5F 0x60 Update Score Current (unchanged)
0x60 0x61 Set Simulation Distance Current (unchanged)
0x61 0x62 Set Subtitle Text Current (unchanged)
0x62 0x63 Update Time Current (unchanged)
0x63 0x64 Set Title Text Current (unchanged)
0x64 0x65 Set Title Animation Times Current (unchanged)
0x65 0x66 Entity Sound Effect Current (unchanged)
0x66 0x67 Sound Effect Current (unchanged)
0x67 0x68 Start Configuration Current (unchanged)
0x68 0x69 Stop Sound Current (unchanged)
0x6A Store Cookie (Play) Pre
0x69 0x6B System Chat Message Current (unchanged)
0x6A 0x6C Set Tab List Header And Footer Current (unchanged)
0x6B 0x6D Tag Query Response Current (unchanged)
0x6C 0x6E Pickup Item Current (unchanged)
0x6D 0x6F Teleport Entity Current (unchanged)
0x6E 0x70 Set Ticking State Current (unchanged)
0x6F 0x71 Step Tick Current (unchanged)
0x72 Transfer (Play) Pre
0x70 0x73 Update Advancements Current (unchanged)
0x71 0x74 Update Attributes Current Pre
0x72 0x75 Entity Effect Current Pre
0x73 0x76 Update Recipes Current (unchanged)
0x74 0x77 Update Tags (play) Current (unchanged)
Play serverbound
0x10 Cookie Response (play) Pre
0x10 0x11 Serverbound Plugin Message (play) Current (unchanged)
0x11 0x12 Edit Book Current (unchanged)
0x12 0x13 Query Entity Tag Current (unchanged)
0x13 0x14 Interact Current (unchanged)
0x14 0x15 Jigsaw Generate Current (unchanged)
0x15 0x16 Serverbound Keep Alive (play) Current (unchanged)
0x16 0x17 Lock Difficulty Current (unchanged)
0x17 0x18 Set Player Position Current (unchanged)
0x18 0x19 Set Player Position and Rotation Current (unchanged)
0x19 0x1A Set Player Rotation Current (unchanged)
0x1A 0x1B Set Player On Ground Current (unchanged)
0x1B 0x1C Move Vehicle Current (unchanged)
0x1C 0x1D Paddle Boat Current (unchanged)
0x1D 0x1E Pick Item Current (unchanged)
0x1E 0x1F Ping Request (play) Current (unchanged)
0x1F 0x20 Place Recipe Current (unchanged)
0x20 0x21 Player Abilities Current (unchanged)
0x21 0x22 Player Action Current (unchanged)
0x22 0x23 Player Command Current (unchanged)
0x23 0x24 Player Input Current (unchanged)
0x24 0x25 Pong (play) Current (unchanged)
0x25 0x26 Change Recipe Book Settings Current (unchanged)
0x26 0x27 Set Seen Recipe Current (unchanged)
0x27 0x28 Rename Item Current (unchanged)
0x28 0x29 Resource Pack Response (play) Current (unchanged)
0x29 0x2A Seen Advancements Current (unchanged)
0x2A 0x2B Select Trade Current (unchanged)
0x2B 0x2C Set Beacon Effect Current (unchanged)
0x2C 0x2D Set Held Item Current (unchanged)
0x2D 0x2E Program Command Block Current (unchanged)
0x2E 0x2F Program Command Block Minecart Current (unchanged)
0x2F 0x30 Set Creative Mode Slot Current (unchanged)
0x30 0x31 Program Jigsaw Block Current (unchanged)
0x31 0x32 Program Structure Block Current (unchanged)
0x32 0x33 Update Sign Current (unchanged)
0x33 0x34 Swing Arm Current (unchanged)
0x34 0x35 Teleport To Entity Current (unchanged)
0x35 0x36 Use Item On Current (unchanged)
0x36 0x37 Use Item Current (unchanged)

New/modified data types

No changes so far.

Entity Metadata

Type Name Value Notes
0 Byte Byte
1 VarInt VarInt
2 VarLong VarLong
3 Float Float
4 String String
5 Text Component Text Component
6 Optional Text Component (Boolean, Optional Text Component) Text Component is present if the Boolean is set to true.
7 Slot Slot
8 Boolean Boolean
9 Rotations (Float, Float, Float) rotation on x, rotation on y, rotation on z
10 Position Position
11 Optional Position (Boolean, Optional Position) Position is present if the Boolean is set to true.
12 Direction VarInt Enum Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
13 Optional UUID (Boolean, Optional UUID) UUID is present if the Boolean is set to true.
14 Block State VarInt An ID in the block state registry.
15 Optional Block State VarInt 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
16 NBT NBT
17 Particle (VarInt, Varies) particle type (an ID in the minecraft:particle_type registry), particle data (See Particles.)
18 Villager Data (VarInt, VarInt, VarInt) villager type, villager profession, level (See below.)
19 Optional VarInt VarInt 0 for absent; 1 + actual value otherwise. Used for entity IDs.
20 Pose VarInt Enum STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14, SLIDING = 15, SHOOTING = 16, INHALING = 17
21 Cat Variant VarInt An ID in the minecraft:cat_variant registry.
22 Frog Variant VarInt An ID in the minecraft:frog_variant registry.
23 Optional Global Position (Boolean, Optional Identifier, Optional Position) dimension identifier, position; only if the Boolean is set to true.
24 Painting Variant VarInt An ID in the minecraft:painting_variant registry.
25 Sniffer State VarInt Enum IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
26 Armadillo State VarInt Enum IDLE = 0, ROLLING = 1, SCARED = 2
26 27 Vector3 (Float, Float, Float) x, y, z
27 28 Quaternion (Float, Float, Float, Float) x, y, z, w

Armadillo

Extends Animal.

Index Type Meaning Default
17 Armadillo State (26) Armadillo State IDLE

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Handshake

Serverbound

Handshake

This causes the server to switch into the target state.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 765 in Minecraft 1.20.4).
Server Address String (255) Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for Status, 2 for Login, 3 for Transfer.

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

Cookie Request (login)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x05 Login Client Key Identifier The identifier of the cookie.

Serverbound

Cookie Response (login)

Response to a Cookie Request (login) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x04 Login Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Optional ByteArray(5120) The data of the cookie, if any.

Configuration

Clientbound

Cookie Request (configuration)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x00 Configuration Client Key Identifier The identifier of the cookie.

Store Cookie (configuration)

Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x09 Configuration Client Key Identifier The identifier of the cookie.
Payload ByteArray(5120) The data of the cookie.

Transfer (configuration)

Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.

Packet ID State Bound To Field Name Field Type Notes
0x0A Configuration Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

Serverbound

Cookie Response (configuration)

Response to a Cookie Request (configuration) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x01 Configuration Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Optional ByteArray(5120) The data of the cookie, if any.

Play

Clientbound

Cookie Request (play)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x16 Play Client Key Identifier The identifier of the cookie.

Store Cookie (play)

Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x6A Play Client Key Identifier The identifier of the cookie.
Payload ByteArray(5120) The data of the cookie.

Transfer (play)

Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.

Packet ID State Bound To Field Name Field Type Notes
0x72 Play Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

Update Attributes

Sets attributes on the given entity.

Packet ID State Bound To Field Name Field Type Notes
0x71 Play Client Entity ID VarInt
Number Of Properties VarInt Number of elements in the following array.
Property Key Id Array Identifier VarInt Enum See below.
Value Double See below.
Number Of Modifiers VarInt Number of elements in the following array.
Modifiers Array of Modifier Data See Attribute#Modifiers. Modifier Data defined below.

Known Key values (see also Attribute#Modifiers):

Id Key Default Min Max Label
0 generic.armor 0.0 0.0 30.0 Armor.
1 generic.armor_toughness 0.0 0.0 20.0 Armor Toughness.
2 generic.attack_damage 2.0 0.0 2048.0 Attack Damage.
3 generic.attack_knockback 0.0 0.0 5.0 Attack Knockback.
4 generic.attack_speed 4.0 0.0 1024.0 Attack Speed.
5 generic.block_interaction_range 4.5 0.0 64.0 Block Interaction Range.
6 generic.entity_interaction_range 3.0 0.0 64.0 Entity Interaction Range.
7 generic.flying_speed 0.4 0.0 1024.0 Flying Speed.
8 generic.follow_range 32.0 0.0 2048.0 Follow Range.
9 horse.jump_strength 0.7 0.0 2.0 Jump Strength.
10 generic.knockback_resistance 0.0 0.0 1.0 Knockback Resistance.
11 generic.luck 0.0 -1024.0 1024.0 Luck.
12 generic.max_absorption 0.0 0.0 2048.0 Max Absorption.
13 generic.max_health 20.0 1.0 1024.0 Max Health.
14 generic.movement_speed 0.7 0.0 1024.0 Movement Speed.
15 generic.scale 1.0 0.0625 16.0 Scale.
16 zombie.spawn_reinforcements 0.0 0.0 1.0 Spawn Reinforcements Chance.
17 generic.step_height 0.6 0.0 10.0 Step Height.

Modifier Data structure:

Field Name Field Type Notes
UUID UUID
Amount Double May be positive or negative.
Operation Byte See below.

The operation controls how the base value of the modifier is changed.

  • 0: Add/subtract amount
  • 1: Add/subtract amount percent of the current value
  • 2: Multiply by amount percent

All of the 0's are applied first, and then the 1's, and then the 2's.

Entity Effect

Packet ID State Bound To Field Name Field Type Notes
0x72 Play Client Entity ID VarInt
Effect ID VarInt See this table.
Amplifier Byte Notchian client displays effect level as Amplifier + 1.
Duration VarInt Duration in ticks. (-1 for infinite)
Flags Byte Bit field, see below.
Has Factor Data Boolean Used in DARKNESS effect
Factor Codec NBT Tag See below
Huh.png The following information needs to be added to this page:
What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?

Within flags:

  • 0x01: Is ambient - was the effect spawned from a beacon? All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray). If all effects on an entity are ambient, the "Is potion effect ambient" living metadata field should be set to true. Usually should not be enabled.
  • 0x02: Show particles - should all particles from this effect be hidden? Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory). Usually should be enabled.
  • 0x04: Show icon - should the icon be displayed on the client? Usually should be enabled.
  • 0x08: Blend - should the effect's hard-coded blending be applied? Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.

Factor Data

Name Type Notes
padding_duration TAG_INT
factor_start TAG_FLOAT
factor_target TAG_FLOAT
factor_current TAG_FLOAT
effect_changed_timestamp TAG_INT
factor_previous_frame TAG_FLOAT
had_effect_last_tick TAG_BOOLEAN

Serverbound

Cookie Response (play)

Response to a Cookie Request (play) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x6A Play Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Optional ByteArray(5120) The data of the cookie, if any.