Pre-release protocol
This page documents the changes from the last stable Minecraft release (currently 1.20.4, protocol 765) to the current pre-release (currently 24w13b, protocol Snapshot 182). 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 | |||
0x01 | Encryption Request | Current | Pre |
0x05 | Cookie Request (login) | Pre | |
Login serverbound | |||
0x04 | Cookie Response (login) | Pre | |
Configuration clientbound | |||
0x00 | Cookie Request (configuration) | Pre | |
Clientbound Plugin Message (configuration) | Current | (unchanged) | |
Disconnect (configuration) | Current | (unchanged) | |
Finish Configuration | Current | (unchanged) | |
Clientbound Keep Alive (configuration) | Current | (unchanged) | |
Ping (configuration) | Current | (unchanged) | |
0x06 | Reset Chat | Pre | |
Registry Data | Current | Pre | |
Remove Resource Pack (configuration) | Current | (unchanged) | |
Add Resource Pack (configuration) | Current | (unchanged) | |
0x0A | Store Cookie (configuration) | Pre | |
0x0B | Transfer (configuration) | Pre | |
Feature Flags | Current | (unchanged) | |
Update Tags (configuration) | Current | (unchanged) | |
0x0E | Clientbound Known Packs | Pre | |
Configuration serverbound | |||
0x01 | Cookie Response (configuration) | Pre | |
Serverbound Plugin Message (configuration) | Current | (unchanged) | |
Finish Configuration | Current | (unchanged) | |
Serverbound Keep Alive (configuration) | Current | (unchanged) | |
Pong (configuration) | Current | (unchanged) | |
Resource Pack Response (configuration) | Current | (unchanged) | |
0x07 | Serverbound Known Packs | Pre | |
Play clientbound | |||
0x16 | Cookie Request (Play) | Pre | |
Set Cooldown | Current | (unchanged) | |
Chat Suggestions | Current | (unchanged) | |
Clientbound Plugin Message (play) | Current | (unchanged) | |
Damage Event | Current | (unchanged) | |
0x1B | Debug Sample | Pre | |
Delete Message | Current | (unchanged) | |
Disconnect (play) | Current | (unchanged) | |
Disguised Chat Message | Current | (unchanged) | |
Entity Event | Current | (unchanged) | |
Explosion | Current | (unchanged) | |
Unload Chunk | Current | (unchanged) | |
Game Event | Current | (unchanged) | |
Open Horse Screen | Current | (unchanged) | |
Hurt Animation | Current | (unchanged) | |
Initialize World Border | Current | (unchanged) | |
Clientbound Keep Alive (play) | Current | (unchanged) | |
Chunk Data and Update Light | Current | (unchanged) | |
World Event | Current | (unchanged) | |
Particle | Current | (unchanged) | |
Update Light | Current | (unchanged) | |
Login (play) | Current | Pre | |
Map Data | Current | (unchanged) | |
Merchant Offers | Current | (unchanged) | |
Update Entity Position | Current | (unchanged) | |
Update Entity Position and Rotation | Current | (unchanged) | |
Update Entity Rotation | Current | (unchanged) | |
Move Vehicle | Current | (unchanged) | |
Open Book | Current | (unchanged) | |
Open Screen | Current | (unchanged) | |
Open Sign Editor | Current | (unchanged) | |
Ping (play) | Current | (unchanged) | |
Ping Response (play) | Current | (unchanged) | |
Place Ghost Recipe | Current | (unchanged) | |
Player Abilities | Current | (unchanged) | |
Player Chat Message | Current | (unchanged) | |
End Combat | Current | (unchanged) | |
Enter Combat | Current | (unchanged) | |
Combat Death | Current | (unchanged) | |
Player Info Remove | Current | (unchanged) | |
Player Info Update | Current | (unchanged) | |
Look At | Current | (unchanged) | |
Synchronize Player Position | Current | (unchanged) | |
Update Recipe Book | Current | (unchanged) | |
Remove Entities | Current | (unchanged) | |
Remove Entity Effect | Current | (unchanged) | |
Reset Score | Current | (unchanged) | |
Remove Resource Pack (play) | Current | (unchanged) | |
Add Resource Pack (play) | Current | (unchanged) | |
Respawn | Current | Pre | |
Set Head Rotation | Current | (unchanged) | |
Update Section Blocks | Current | (unchanged) | |
Select Advancements Tab | Current | (unchanged) | |
Server Data | Current | (unchanged) | |
Set Action Bar Text | Current | (unchanged) | |
Set Border Center | Current | (unchanged) | |
Set Border Lerp Size | Current | (unchanged) | |
Set Border Size | Current | (unchanged) | |
Set Border Warning Delay | Current | (unchanged) | |
Set Border Warning Distance | Current | (unchanged) | |
Set Camera | Current | (unchanged) | |
Set Held Item | Current | (unchanged) | |
Set Center Chunk | Current | (unchanged) | |
Set Render Distance | Current | (unchanged) | |
Set Default Spawn Position | Current | (unchanged) | |
Display Objective | Current | (unchanged) | |
Set Entity Metadata | Current | (unchanged) | |
Link Entities | Current | (unchanged) | |
Set Entity Velocity | Current | (unchanged) | |
Set Equipment | Current | (unchanged) | |
Set Experience | Current | (unchanged) | |
Set Health | Current | (unchanged) | |
Update Objectives | Current | (unchanged) | |
Set Passengers | Current | (unchanged) | |
Update Teams | Current | (unchanged) | |
Update Score | Current | (unchanged) | |
Set Simulation Distance | Current | (unchanged) | |
Set Subtitle Text | Current | (unchanged) | |
Update Time | Current | (unchanged) | |
Set Title Text | Current | (unchanged) | |
Set Title Animation Times | Current | (unchanged) | |
Entity Sound Effect | Current | (unchanged) | |
Sound Effect | Current | (unchanged) | |
Start Configuration | Current | (unchanged) | |
Stop Sound | Current | (unchanged) | |
0x6B | Store Cookie (Play) | Pre | |
System Chat Message | Current | (unchanged) | |
Set Tab List Header And Footer | Current | (unchanged) | |
Tag Query Response | Current | (unchanged) | |
Pickup Item | Current | (unchanged) | |
Teleport Entity | Current | (unchanged) | |
Set Ticking State | Current | (unchanged) | |
Step Tick | Current | (unchanged) | |
0x73 | Transfer (Play) | Pre | |
Update Advancements | Current | (unchanged) | |
Update Attributes | Current | Pre | |
Entity Effect | Current | Pre | |
Update Recipes | Current | (unchanged) | |
Update Tags (play) | Current | (unchanged) | |
Play serverbound | |||
0x04 | Chat Command | Current | Pre |
0x05 | Signed Chat Command | Pre | |
Chat Message | Current | (unchanged) | |
Player Session | Current | (unchanged) | |
Chunk Batch Received | Current | (unchanged) | |
Client Status | Current | (unchanged) | |
Client Information (play) | Current | (unchanged) | |
Command Suggestions Request | Current | (unchanged) | |
Acknowledge Configuration | Current | (unchanged) | |
Click Container Button | Current | (unchanged) | |
Click Container | Current | (unchanged) | |
Close Container | Current | (unchanged) | |
Change Container Slot State | Current | (unchanged) | |
0x11 | Cookie Response (play) | Pre | |
Serverbound Plugin Message (play) | Current | (unchanged) | |
0x13 | Debug Sample Subscription | Pre | |
Edit Book | Current | (unchanged) | |
Query Entity Tag | Current | (unchanged) | |
Interact | Current | (unchanged) | |
Jigsaw Generate | Current | (unchanged) | |
Serverbound Keep Alive (play) | Current | (unchanged) | |
Lock Difficulty | Current | (unchanged) | |
Set Player Position | Current | (unchanged) | |
Set Player Position and Rotation | Current | (unchanged) | |
Set Player Rotation | Current | (unchanged) | |
Set Player On Ground | Current | (unchanged) | |
Move Vehicle | Current | (unchanged) | |
Paddle Boat | Current | (unchanged) | |
Pick Item | Current | (unchanged) | |
Ping Request (play) | Current | (unchanged) | |
Place Recipe | Current | (unchanged) | |
Player Abilities | Current | (unchanged) | |
Player Action | Current | (unchanged) | |
Player Command | Current | (unchanged) | |
Player Input | Current | (unchanged) | |
Pong (play) | Current | (unchanged) | |
Change Recipe Book Settings | Current | (unchanged) | |
Set Seen Recipe | Current | (unchanged) | |
Rename Item | Current | (unchanged) | |
Resource Pack Response (play) | Current | (unchanged) | |
Seen Advancements | Current | (unchanged) | |
Select Trade | Current | (unchanged) | |
Set Beacon Effect | Current | (unchanged) | |
Set Held Item | Current | (unchanged) | |
Program Command Block | Current | (unchanged) | |
Program Command Block Minecart | Current | (unchanged) | |
Set Creative Mode Slot | Current | (unchanged) | |
Program Jigsaw Block | Current | (unchanged) | |
Program Structure Block | Current | (unchanged) | |
Update Sign | Current | (unchanged) | |
Swing Arm | Current | (unchanged) | |
Teleport To Entity | Current | (unchanged) | |
Use Item On | Current | (unchanged) | |
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 | Particles | (VarInt, Array of Particle) | length of array, particle data (See directly above.) |
Villager Data | (VarInt, VarInt, VarInt) | villager type, villager profession, level (See below.) | |
Optional VarInt | VarInt | 0 for absent; 1 + actual value otherwise. Used for entity IDs. | |
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 | |
Cat Variant | VarInt | An ID in the minecraft:cat_variant registry.
| |
Wolf Variant | VarInt | An ID in the minecraft:wolf_variant registry.
| |
Frog Variant | VarInt | An ID in the minecraft:frog_variant registry.
| |
Optional Global Position | (Boolean, Optional Identifier, Optional Position) | dimension identifier, position; only if the Boolean is set to true. | |
Painting Variant | VarInt | An ID in the minecraft:painting_variant registry.
| |
Sniffer State | VarInt Enum | IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6 | |
Armadillo State | VarInt Enum | IDLE = 0, ROLLING = 1, SCARED = 2 | |
Vector3 | (Float, Float, Float) | x, y, z | |
Quaternion | (Float, Float, Float, Float) | x, y, z, w |
Living Entity
TODO: This has changed to use the PARTICLES attribute
Wolf
Extends Tameable Animal.Inherited entity Tameable Animal does not existInherited entity Tameable Animal does not exist
Index | Type | Meaning | Default | |
---|---|---|---|---|
0 | Wolf Variant ( |
Wolf Variant | PALE | |
1 | Boolean (8) | Is begging | false | |
2 | VarInt (1) | Collar color (values are those used with dyes) | 14 (Red) | |
3 | VarInt (1) | Anger time | 0 |
Armadillo
Extends Animal.
Index | Type | Meaning | Default | |
---|---|---|---|---|
17 | Armadillo State ( |
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
Encryption Request
Packet ID | State | Bound To | Field Name | Field Type | Notes |
---|---|---|---|---|---|
0x01 | Login | Client | Server ID | String (20) | Appears to be empty. |
Public Key Length | VarInt | Length of Public Key. | |||
Public Key | Byte Array | The server's public key, in bytes. | |||
Verify Token Length | VarInt | Length of Verify Token. Always 4 for Notchian servers. | |||
Verify Token | Byte Array | A sequence of random bytes generated by the server. | |||
Should Authenticate | Boolean |
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 Length | VarInt | Length of the following byte array. | |||||
Payload | Optional Byte Array (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. |
Reset Chat
Packet ID | State | Bound To | Field Name | Field Type | Notes |
---|---|---|---|---|---|
0x06 | Configuration | Client | no fields |
Registry Data
Represents certain registries that are sent from the server and are applied on the client. The packet is sent for each of the following registries: minecraft:worldgen/biome
, minecraft:chat_type
, minecraft:trim_pattern
, minecraft:trim_material
, minecraft:wolf_variant
, minecraft:dimension_type
, minecraft:damage_type
, and minecraft:banner_pattern
.
Packet ID | State | Bound To | Field Name | Field Type | Notes | ||
---|---|---|---|---|---|---|---|
0x07 | Configuration | Client | Registry Codec | NBT (Compound) | See Registry Data. | ||
Registry ID | Identifier | ||||||
Entry Count | VarInt | Number of entries in the following array. | |||||
Entries | Entry ID | Array | Identifier | ||||
Has Data | Boolean | Whether the entry has any data following. | |||||
Data | NBT Tag | Entry data. Only present if Has Data is true. |
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 | ||
---|---|---|---|---|---|---|---|
0x0A | 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 | ||
---|---|---|---|---|---|---|---|
0x0B | Configuration | Client | Host | String | The hostname of IP of the server. | ||
Port | VarInt | The port of the server. |
Clientbound Known Packs
Packet ID | State | Bound To | Field Name | Field Type | Notes | ||
---|---|---|---|---|---|---|---|
0x0E | Configuration | Client | Known Pack Count | VarInt | The number of known packs in the following array. | ||
Known Packs | Namespace | Array | String | ||||
ID | String | ||||||
Version | String |
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 Length | VarInt | Length of the following byte array. | |||||
Payload | Optional Byte Array (5120) | The data of the cookie, if any. |
Serverbound Known Packs
ID 0x07, same structure as Clientbound Known Packs. If the client specifies a pack in this packet, the server should omit its contained data from Registry Data.
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. |
Debug Sample
Packet ID | State | Bound To | Field Name | Field Type | Notes |
---|---|---|---|---|---|
0x1B | Play | Client | Sample Length | VarInt | The length of the following array. |
Sample | Long Array | TODO: What is the structure of the data in this array? | |||
Sample Type | VarInt Enum | The type of sample data. Currently always 0 (TICK_TIME). |
Login (play)
Packet ID | State | Bound To | Field Name | Field Type | Notes |
---|---|---|---|---|---|
0x2B | Play | Client | Entity ID | Int | The player's Entity ID (EID). |
Is hardcore | Boolean | ||||
Dimension Count | VarInt | Size of the following array. | |||
Dimension Names | Array of Identifier | Identifiers for all dimensions on the server. | |||
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). | |||
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 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. | |||
Do limited crafting | Boolean | Whether players can only craft recipes they have already unlocked. Currently unused by the client. | |||
Dimension Type | The ID of the type of dimension in the minecraft:dimension_type registry, defined by the Registry Data packet.
| ||||
Dimension Name | Identifier | Name of the dimension being spawned into. | |||
Hashed seed | Long | First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise | |||
Game mode | Unsigned Byte | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. | |||
Previous Game mode | Byte | -1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed) | |||
Is Debug | Boolean | True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks. | |||
Is Flat | Boolean | True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63. | |||
Has death location | Boolean | If true, then the next two fields are present. | |||
Death dimension name | Optional Identifier | Name of the dimension the player died in. | |||
Death location | Optional Position | The location that the player died at. | |||
Portal cooldown | VarInt | The number of ticks until the player can use the portal again. |
Respawn
Packet ID | State | Bound To | Field Name | Field Type | Notes |
---|---|---|---|---|---|
0x47 | Play | Client | Dimension Type | The ID of the type of dimension in the minecraft:dimension_type registry, defined by the Registry Data packet.
| |
Dimension Name | Identifier | Name of the dimension being spawned into. | |||
Hashed seed | Long | First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise | |||
Game mode | Unsigned Byte | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. | |||
Previous Game mode | Byte | -1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed) | |||
Is Debug | Boolean | True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks. | |||
Is Flat | Boolean | True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63. | |||
Has death location | Boolean | If true, then the next two fields are present. | |||
Death dimension Name | Optional Identifier | Name of the dimension the player died in. | |||
Death location | Optional Position | The location that the player died at. | |||
Portal cooldown | VarInt | The number of ticks until the player can use the portal again. | |||
Data kept | Byte | Bit mask. 0x01: Keep attributes, 0x02: Keep metadata. Tells which data should be kept on the client side once the player has respawned.
In the Notchian implementation, this is context dependent:
|
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 | ||
---|---|---|---|---|---|---|---|
0x6B | Play | Client | Key | Identifier | The identifier of the cookie. | ||
Payload Length | VarInt | Length of the following byte array. | |||||
Payload | Byte Array (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 | ||
---|---|---|---|---|---|---|---|
0x73 | 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 | Array | 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):
These changed between 24w03b and 24w13a, TODO: Update this
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 |
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
Chat Command
Packet ID | State | Bound To | Field Name | Field Type | Notes | |||
---|---|---|---|---|---|---|---|---|
0x04 | Play | Server | Command | String (256) | The command typed by the client. | |||
Timestamp | Long | The timestamp that the command was executed. | ||||||
Salt | Long | The salt for the following argument signatures. | ||||||
Array length | VarInt | Number of entries in the following array. The maximum length in Notchian server is 8. | ||||||
Array of argument signatures | Argument name | Array (8) | String (16) | The name of the argument that is signed by the following signature. | ||||
Signature | Byte Array (256) | The signature that verifies the argument. Always 256 bytes and is not length-prefixed. | ||||||
Message Count | VarInt | |||||||
Acknowledged | Fixed BitSet (20) |
Signed Chat Command
Packet ID | State | Bound To | Field Name | Field Type | Notes | ||
---|---|---|---|---|---|---|---|
0x05 | Play | Server | Command | String(256) | The command typed by the client. | ||
Timestamp | Long | The timestamp that the command was executed. Milliseconds since the Unix epoch. | |||||
Salt | Long | The salt for the following argument signatures. | |||||
Argument Signature Count | VarInt | Number of elements in the following array. The maximum length in Notchian server is 8. | |||||
Argument Signatures | Name | Array | String(16) | The name of the argument that is signed by the following signature. | |||
Signature | ByteArray(256) | The signature that verifies the argument. Always 256 bytes and is not length-prefixed. | |||||
Seen Messages Offset | VarInt | ||||||
Seen Messages Acknowledged | Fixed BitSet(20) |
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 | ||
---|---|---|---|---|---|---|---|
0x11 | 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 Length | Optional VarInt | Length of the following byte array. | |||||
Payload | Optional Byte Array (5120) | The data of the cookie, if any. |
Debug Sample Subscription
Packet ID | State | Bound To | Field Name | Field Type | Notes |
---|---|---|---|---|---|
0x13 | Play | Server | Sample Type | VarInt Enum | The type of debug sample to subscribe to. Currently always 0 (TICK_TIME). |