Difference between revisions of "Pre-release protocol"

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m (→‎Entity Metadata: This should be marked as new, I think.)
(→‎Entity Metadata: Merge changes from stable docs to incorporate new metadata type templates. Fix my earlier mistake on Pose in the process.)
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== Entity Metadata ==
 
== Entity Metadata ==
  
−
{| class="wikitable"
+
{{#vardefine: meta_prerelease | 1}}
−
! Type ([[Data Types#Definitions:varint|VarInt]] Enum)
+
 
−
  ! Value (Varies)
+
{{Metadata type definition/begin}}
 +
  ! Value
 
  ! Notes
 
  ! Notes
−
|-
+
{{Metadata type definition|Byte}}
−
| 0
+
  | {{Type|Byte}}
−
  | [[Data Types#Definitions:byte|Byte]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|VarInt}}
−
| 1
+
  | {{Type|VarInt}}
−
  | [[Data Types#Definitions:varint|VarInt]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|VarLong}}
−
| 2
+
  | {{Type|VarLong}}
−
  | [[Data Types#Definitions:varlong|VarLong]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|Float}}
−
| 3
+
  | {{Type|Float}}
−
  | [[Data Types#Definitions:float|Float]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|String}}
−
| 4
+
  | {{Type|String}}
−
  | [[Data Types#Definitions:string|String]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|Text Component}}
−
| 5
+
  | {{Type|Text Component}}
−
  | [[Data Types#Definitions:chat|Chat]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|Optional Text Component}}
−
  | 6
+
  | ({{Type|Boolean}}, {{Type|Optional}} {{Type|Text Component}})
−
| OptChat (Boolean + [[Data Types#Definitions:chat|Chat]])
+
  | Text Component is present if the Boolean is set to true.
−
  | [[Data Types#Definitions:chat|Chat]] is present if the Boolean is set to true
+
{{Metadata type definition|Slot}}
−
|-
+
  | {{Type|Slot}}
−
| 7
 
−
  | [[Data Types#Definitions:slot|Slot]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|Boolean}}
−
| 8
+
  | {{Type|Boolean}}
−
  | [[Data Types#Definitions:boolean|Boolean]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|Rotations}}
−
  | 9
+
  | ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
−
| [[Data Types#Definitions:rotation|Rotation]]
+
  | rotation on x, rotation on y, rotation on z
−
  | 3 [[Data Types#Definitions:float|Floats]]: rotation on x, rotation on y, rotation on z
+
{{Metadata type definition|Position}}
−
|-
+
  | {{Type|Position}}
−
  | 10
 
−
| [[Data Types#Position|Position]]
 
 
  |
 
  |
−
|-
+
{{Metadata type definition|Optional Position}}
−
  | 11
+
  | ({{Type|Boolean}}, {{Type|Optional}} {{Type|Position}})
−
| OptPosition (Boolean + Position)
+
  | Position is present if the Boolean is set to true.
−
  | Position is present if the Boolean is set to true
+
{{Metadata type definition|Direction}}
−
|-
+
  | {{Type|VarInt}} {{Type|Enum}}
−
  | 12
+
  | Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
−
| Direction ([[Data Types#Definitions:varint|VarInt]])
+
{{Metadata type definition|Optional UUID}}
−
  | (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
+
  | ({{Type|Boolean}}, {{Type|Optional}} {{Type|UUID}})
−
|-
+
  | UUID is present if the Boolean is set to true.
−
  | 13
+
{{Metadata type definition|Block State}}
−
| OptUUID (Boolean + UUID)
+
  | {{Type|VarInt}}
−
  | UUID is present if the Boolean is set to true
+
  | An ID in the block state registry.
−
|-
+
{{Metadata type definition|Optional Block State}}
−
| 14
+
  | {{Type|VarInt}}
−
  | BlockID ([[Data Types#Definitions:varint|VarInt]])
+
  | 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
−
  |-
+
{{Metadata type definition|NBT}}
−
| 15
+
  | {{Type|NBT}}
−
  | OptBlockID ([[Data Types#Definitions:varint|VarInt]])
 
−
  | 0 for absent (implies air); otherwise, a block state ID as per the block state registry
 
−
|-
 
−
| 16
 
−
  | [[Data_types#Definitions:nbt|NBT]]
 
−
|
 
−
|-
 
−
| 17
 
−
| [[Data Types#Particle|Particle]]
 
 
  |
 
  |
−
  |-
+
{{Metadata type definition|Particle}}
−
  | 18
+
  | ({{Type|VarInt}}, Varies)
−
| Villager Data
+
  | particle type (an ID in the <code>minecraft:particle_type</code> registry), particle data (See [[Particles]].)
−
  | 3 [[Data Types#Definitions:varint|VarInts]]: villager type, villager profession, level
+
{{Metadata type definition|Villager Data}}
−
|-
+
  | ({{Type|VarInt}}, {{Type|VarInt}}, {{Type|VarInt}})
−
  | 19
+
| villager type, villager profession, level (See below.)
−
| OptVarInt
+
{{Metadata type definition|Optional VarInt}}
−
  | 0 for absent; 1 + actual value otherwise. Used for entity IDs.
+
  | {{Type|VarInt}}
−
|-
+
  | 0 for absent; 1 + actual value otherwise. Used for entity IDs.
−
  | 20
+
{{Metadata type definition|Pose}}
−
| Pose
+
  | {{Type|VarInt}} {{Type|Enum}}
−
  | A [[Data Types#Definitions:varint|VarInt]] enum: 0: STANDING, 1: FALL_FLYING, 2: SLEEPING, 3: SWIMMING, 4: SPIN_ATTACK, 5: SNEAKING, 6: LONG_JUMPING, 7: DYING, 8: CROAKING, 9: USING_TONGUE, 10: SITTING, 11: ROARING, 12: SNIFFING, 13: EMERGING{{change||, 14: DIGGING, 15: SLIDING, 16: SHOOTING, 17: INHALING}}
+
  | 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}}
−
  | 21
+
  | {{Type|VarInt}}
−
| Cat Variant
+
  | An ID in the <code>minecraft:cat_variant</code> registry.
−
  | A [[Data Types#Definitions:varint|VarInt]] that points towards the CAT_VARIANT registry.
+
{{Metadata type definition|Frog Variant}}
−
|-
+
  | {{Type|VarInt}}
−
  | 22
+
  | An ID in the <code>minecraft:frog_variant</code> registry.
−
| Frog Variant
+
{{Metadata type definition|Optional Global Position}}
−
  | A [[Data Types#Definitions:varint|VarInt]] that points towards the FROG_VARIANT registry.
+
  | ({{Type|Boolean}}, {{Type|Optional}} {{Type|Identifier}}, {{Type|Optional}} {{Type|Position}})
−
|-
+
  | dimension identifier, position; only if the Boolean is set to true.
−
  | 23
+
{{Metadata type definition|Painting Variant}}
−
| OptGlobalPos (Boolean + GlobalPos)
+
  | {{Type|VarInt}}
−
  | GlobalPos consists of a dimension identifier and [[Data Types#Position|Position]].
+
  | An ID in the <code>minecraft:painting_variant</code> registry.
−
|-
+
{{Metadata type definition|Sniffer State}}
−
  | 24
+
  | {{Type|VarInt}} {{Type|Enum}}
−
| Painting Variant
+
  | IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
−
  | A [[Data Types#Definitions:varint|VarInt]] that points towards the PAINTING_VARIANT registry.
+
{{Metadata type definition|Armadillo State|rel=added}}
−
|-
+
  | {{Type|VarInt}} {{Type|Enum}}
−
  | 25
+
  | IDLE = 0, ROLLING = 1, SCARED = 2
−
| Sniffer State
+
{{Metadata type definition|Vector3}}
−
  | A [[Data Types#Definitions:varint|VarInt]] enum: IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
+
  | ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
−
|- {{added}}
+
  | x, y, z
−
  | 26
+
{{Metadata type definition|Quaternion}}
−
| Armadillo State
+
  | ({{Type|Float}}, {{Type|Float}}, {{Type|Float}}, {{Type|Float}})
−
  | A [[Data Types#Definitions:varint|VarInt]] enum: IDLE = 0, ROLLING = 1, SCARED = 2
+
  | x, y, z, w
−
|-
 
−
  | {{change|26|27}}
 
−
| Vector3
 
−
  | 3 [[Data Types#Definitions:float|Floats]]: x, y, z
 
−
|-
 
−
  | {{change|27|28}}
 
−
| Quaternion
 
−
  | 4 [[Data Types#Definitions:float|Floats]]: x, y, z, w
 
−
|-
 
 
  |}
 
  |}
  
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  ! Default
 
  ! Default
 
  |-
 
  |-
−
  | {{Metadata id|}}
+
  | {{Metadata id|added}}
−
  | Armadillo State
+
  | {{Metadata type|Armadillo State}}
 
  |colspan="2"| Armadillo State
 
  |colspan="2"| Armadillo State
 
  | IDLE
 
  | IDLE

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.
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