Game

Clientbound (Client → Server)

0x00 Add Entity to Client

This packet is used to inform the client about a new entity that has been added to the game world. It contains all necessary information about the entity, such as its ID, type, position, and movement data.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	Unique identifier for the entity within the world.
uuid	Entity UUID	UUID	Universally unique identifier for the entity, used for tracking across sessions.
type	Entity Type	EntityType	The type of entity being added, such as a player, mob, or item.
x	X Position	Double	The X coordinate of the entity's position in the world.
y	Y Position	Double	The Y coordinate of the entity's position in the world.
z	Z Position	Double	The Z coordinate of the entity's position in the world.
xa	X Velocity	Short	The velocity of the entity along the X axis, scaled by 8000.
ya	Y Velocity	Short	The velocity of the entity along the Y axis, scaled by 8000.
za	Z Velocity	Short	The velocity of the entity along the Z axis, scaled by 8000.
xRot	X Rotation	Byte	The rotation of the entity around the X axis, packed as a byte.
yRot	Y Rotation	Byte	The rotation of the entity around the Y axis, packed as a byte.
yHeadRot	Y Head Rotation	Byte	The rotation of the entity's head around the Y axis, packed as a byte.
data	Entity Data	VarInt	Additional data specific to the entity type, such as variant or state information.

0x01 Add Experience Orb Packet

This packet is sent from the server to the client to inform the client about the addition of an experience orb in the game world. It contains information about the orb's unique identifier, its position in the world, and the amount of experience it holds.

Field	Display Name	Type	Notes
id	Experience Orb ID	VarInt	A unique identifier for the experience orb. This ID is used to track the orb within the game world.
x	X Coordinate	Double	The X coordinate of the experience orb's position in the game world.
y	Y Coordinate	Double	The Y coordinate of the experience orb's position in the game world.
z	Z Coordinate	Double	The Z coordinate of the experience orb's position in the game world.
value	Experience Value	Short	The amount of experience points the orb contains. This value is used to determine how much experience a player gains when collecting the orb.

0x02 Animation Packet for Client

This packet is used to communicate animation actions from the server to the client, such as swinging an arm or performing a critical hit.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity performing the animation.
action	Animation Action	UnsignedByte	The specific animation action to be performed, represented by an integer constant (e.g., SWING_MAIN_HAND, WAKE_UP).

0x03 Award Statistics to Client

This packet is sent from the server to the client to update the client with the current statistics that have been awarded to the player. It contains a map of statistics and their corresponding values.

Field	Display Name	Type	Notes
stats	Statistics Map	Object2IntMap<Stat<?>>	This field contains a map where each key is a statistic and the value is the integer count of that statistic. It uses a fastutil Object2IntMap for efficient storage and retrieval.
STAT_VALUES_STREAM_CODEC	Statistics Stream Codec	StreamCodec<RegistryFriendlyByteBuf Object2IntMap<Stat<?>>>	This codec is used to encode and decode the statistics map to and from the byte buffer. It utilizes a map codec with a custom constructor and the Stat stream codec.
STREAM_CODEC	Packet Stream Codec	StreamCodec<RegistryFriendlyByteBuf ClientboundAwardStatsPacket>	This codec is used to encode and decode the entire packet, mapping the statistics stream codec to the packet constructor and stats method.

0x04 Acknowledgment of Block Change

This packet is sent from the server to the client to acknowledge that a block change has been processed. It ensures that the client is aware of the sequence of block changes that have occurred.

Field	Display Name	Type	Notes
sequence	Sequence Number	VarInt	This field represents the sequence number of the block change acknowledgment. It is used to track the order of block changes and ensure that they are processed in the correct sequence.

0x05 Block Destruction Notification

This packet is sent from the server to the client to notify about the progress of block destruction at a specific position. It is used to update the client on the current state of block breaking, such as when a player is mining a block.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity that is causing the block destruction. This helps in associating the destruction progress with a specific entity, such as a player.
pos	Block Position	BlockPos	The coordinates of the block being destroyed. This is used to locate the block in the world.
progress	Destruction Progress	UnsignedByte	The current progress of the block destruction, typically represented as a percentage (0-9). This indicates how much of the block has been destroyed.

0x06 Block Entity Data Transmission

This packet is used to send data about a block entity from the server to the client. It includes the position of the block, its type, and any additional data stored in a CompoundTag.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	The position of the block entity in the world. This is crucial for the client to know where the block entity is located.
type	Block Entity Type	BlockEntityType<?>	The type of block entity being updated. This helps the client understand what kind of block entity it is dealing with.
tag	Block Entity Data	CompoundTag	Additional data for the block entity, stored in a CompoundTag. This can include custom data specific to the block entity's functionality.

0x07 Block Event Notification Packet

This packet is sent from the server to the client to notify about a block event occurring at a specific position in the game world. It includes information about the block's position, the block type, and two additional parameters that define the event.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	The position of the block in the game world where the event is occurring.
b0	Event Parameter 1	Unsigned Byte	The first parameter of the block event, typically used to specify the type or state of the event.
b1	Event Parameter 2	Unsigned Byte	The second parameter of the block event, often used in conjunction with the first parameter to provide additional event details.
block	Block Type	Block	The type of block that is involved in the event, identified using the block registry.

0x08 Block Update Notification

This packet is sent from the server to the client to inform about a change in the block state at a specific position in the world. It updates the client with the new block state at the given position.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	This field represents the position of the block in the world that has been updated. It is crucial for the client to know where the block change has occurred.
blockState	Block State	BlockState	This field contains the new state of the block at the specified position. It includes information about the type of block and its properties.

0x09 Boss Event Packet

This packet is used to manage boss events in the game, such as adding, removing, or updating boss bars.

Field	Display Name	Type	Notes
id	Unique Identifier	UUID	A unique identifier for the boss event.
operation	Operation Type	ClientboundBossEventPacket.Operation	The specific operation to perform on the boss event, such as add, remove, or update.
write	Write Method	RegistryFriendlyByteBuf	Writes the packet data to the buffer, including the UUID and operation type.

0x0a Change Difficulty Packet

This packet is sent from the server to the client to inform about a change in the game's difficulty level. It also indicates whether the difficulty is locked, preventing further changes.

Field	Display Name	Type	Notes
difficulty	Game Difficulty	Difficulty	Represents the difficulty level of the game. It is read from the buffer as an unsigned byte and corresponds to a specific difficulty level using the Difficulty.byId method.
locked	Difficulty Locked Flag	boolean	Indicates whether the difficulty setting is locked. If true, the difficulty cannot be changed by the player. It is read from the buffer as a boolean value.

0x0b Notify client of completed chunk batch processing

This packet is sent from the server to the client to indicate that a batch of chunks has been processed and is ready for the client to handle. It helps in managing the flow of chunk data to the client, ensuring that the client is aware of the completion of a batch of chunks.

Field	Display Name	Type	Notes
batchSize	Batch Size	VarInt	This field represents the number of chunks that were processed in the batch. It is read from the buffer using readVarInt and written using writeVarInt.

0x0c Chunk Batch Start Packet

This packet is sent from the server to the client to indicate the start of a batch of chunk data being sent. It is used to optimize the transmission of multiple chunks by grouping them together.

Field	Display Name	Type	Notes
INSTANCE	Singleton Instance	ClientboundChunkBatchStartPacket	A singleton instance of the packet, used to avoid creating multiple instances since the packet does not carry any data.
STREAM_CODEC	Stream Codec	StreamCodec<ByteBuf ClientboundChunkBatchStartPacket>	A codec for encoding and decoding the packet, using a unit codec since the packet has no data.

0x0d Clientbound Chunks Biomes Packet

This packet is used to send biome data for multiple chunks from the server to the client. It includes the position and biome data for each chunk.

Field	Display Name	Type	Notes
chunkBiomeData	Chunk Biome Data	List<ClientboundChunksBiomesPacket.ChunkBiomeData>	A list containing biome data for each chunk.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ClientboundChunksBiomesPacket>	Codec for encoding and decoding the packet.
TWO_MEGABYTES	Two Megabytes	int	Constant representing the maximum size of the byte array for chunk data.

0x0e Clear Titles Packet

This packet is used to clear titles from the player's screen in the game. It can also reset the title display times if specified.

Field	Display Name	Type	Notes
resetTimes	Reset Title Times	Boolean	Indicates whether the title display times should be reset. If true, the title times are reset; otherwise, they are not.

0x0f Command Suggestions Packet

This packet is used to send command suggestions from the server to the client. It provides a list of possible completions for a command that the player is typing.

Field	Display Name	Type	Notes
id	Suggestion ID	VarInt	A unique identifier for the suggestion request. This ID is used to match the response with the request.
start	Start Index	VarInt	The starting index of the command input where suggestions should be applied.
length	Length of Input	VarInt	The length of the command input that is being suggested.
suggestions	List of Suggestions	List<ClientboundCommandSuggestionsPacket.Entry>	A list of possible command completions, each with optional tooltips.

0x10 Clientbound Commands Packet

This packet is responsible for synchronizing command trees from the server to the client. It allows the client to understand the available commands and their structure, enabling features like command suggestions and validation.

Field	Display Name	Type	Notes
rootIndex	Root Index	VarInt	The index of the root command node in the entries list.
entries	Entries	List<ClientboundCommandsPacket.Entry>	A list of command entries representing the nodes in the command tree.

0x11 Close Container Packet

This packet is sent from the server to the client to indicate that a container (such as a chest or crafting table) should be closed.

Field	Display Name	Type	Notes
containerId	Container Identifier	int	This field represents the unique identifier of the container that is being closed. It is used to specify which container should be closed on the client side.

0x12 Container Content Update Packet

This packet is sent from the server to the client to update the contents of a container, such as a chest or inventory, including the item being carried by the player.

Field	Display Name	Type	Notes
containerId	Container Identifier	ContainerId	Unique identifier for the container whose contents are being updated.
stateId	State Identifier	VarInt	Represents the current state of the container, used for synchronization purposes.
items	Container Items	ItemStack List	A list of items currently in the container. Each item is represented as an ItemStack.
carriedItem	Carried Item	ItemStack	The item currently being carried by the player, represented as an ItemStack.

0x13 Container Data Update Packet

This packet is sent from the server to the client to update data in a container, such as a chest or a furnace. It informs the client about changes in the container's data, like progress bars or other state information.

Field	Display Name	Type	Notes
containerId	Container Identifier	ContainerId	This field represents the unique identifier for the container whose data is being updated. It is used to specify which container the data update is for.
id	Data Identifier	Short	This field specifies the particular data point within the container that is being updated. It acts as an index or key for the data being modified.
value	Data Value	Short	This field contains the new value for the data point specified by the 'id' field. It represents the updated state or value for that data point.

0x14 Update Container Slot

This packet is sent from the server to the client to update the item in a specific slot of a container. It informs the client about changes in the inventory or container slots, ensuring the client has the correct item data.

Field	Display Name	Type	Notes
containerId	Container Identifier	int	The ID of the container being updated. This helps the client identify which container's slot is being modified.
stateId	State Identifier	VarInt	A unique identifier for the current state of the container. It is used to ensure that the client and server are synchronized.
slot	Slot Index	short	The index of the slot within the container that is being updated. This tells the client which specific slot to update.
itemStack	Item Stack	ItemStack	The item stack to be placed in the specified slot. This includes the item type, count, and any additional data like enchantments or custom names.

0x15 Clientbound Cookie Request Packet

This packet is used to request a cookie from the client, identified by a specific resource location key.

Field	Display Name	Type	Notes
key	Resource Location Key	ResourceLocation	This field represents the unique identifier for the cookie being requested. It is read from the buffer when the packet is constructed and written to the buffer when the packet is sent.

0x16 Cooldown Notification Packet

This packet is sent from the server to the client to notify about the cooldown period for a specific item or action. It informs the client about the duration for which a particular item or action is on cooldown, preventing its use until the cooldown expires.

Field	Display Name	Type	Notes
cooldownGroup	Cooldown Group Identifier	ResourceLocation	This field represents the unique identifier for the group of items or actions that are on cooldown. It uses the ResourceLocation type to ensure uniqueness across different namespaces.
duration	Cooldown Duration	VarInt	This field specifies the duration of the cooldown in ticks. The client uses this information to display the cooldown timer to the player.

0x17 Custom Chat Completions Packet

This packet is used to manage custom chat completions on the client side. It allows the server to add, remove, or set specific chat completions that the client can use.

Field	Display Name	Type	Notes
action	Action Type	Enum	Specifies the type of action to be performed on the chat completions. It can be ADD, REMOVE, or SET.
entries	Chat Completion Entries	List<String>	A list of chat completion entries that are affected by the action. These are UTF-8 encoded strings.

0x18 Custom Payload Packet

This packet is used to send custom payloads from the server to the client. It allows for the transmission of various types of data that are not covered by standard packets, enabling custom features and debugging information to be communicated.

Field	Display Name	Type	Notes
payload	Custom Payload	CustomPacketPayload	The main data being transmitted in this packet. It can be of various types, such as BrandPayload, BeeDebugPayload, etc.
MAX_PAYLOAD_SIZE	Maximum Payload Size	int	The maximum size allowed for the payload, set to 1048576 bytes (1 MB).
GAMEPLAY_STREAM_CODEC	Gameplay Stream Codec	StreamCodec<RegistryFriendlyByteBuf ClientboundCustomPayloadPacket>	Codec used for encoding and decoding gameplay-related custom payloads. It supports a variety of payload types for different debugging and gameplay features.
CONFIG_STREAM_CODEC	Config Stream Codec	StreamCodec<FriendlyByteBuf ClientboundCustomPayloadPacket>	Codec used for encoding and decoding configuration-related custom payloads, primarily focused on BrandPayload.

0x19 Clientbound Damage Event Packet

This packet is used to communicate damage events from the server to the client, detailing the source and cause of the damage inflicted on an entity.

Field	Display Name	Type	Notes
entityId	Entity ID	VarInt	The unique identifier of the entity that received the damage.
sourceType	Source Type	Holder<DamageType>	The type of damage source, encoded using a stream codec.
sourceCauseId	Source Cause ID	VarInt	The ID of the entity that caused the damage, if applicable. If no entity caused the damage, this value is -1.
sourceDirectId	Source Direct ID	VarInt	The ID of the direct entity involved in the damage, if applicable. If no direct entity is involved, this value is -1.
sourcePosition	Source Position	Optional<Vec3>	The position from which the damage originated, if applicable. This is optional and may not be present.

0x1a Debug Sample Packet

This packet is used to send debug sample data from the server to the client. It includes a series of long values representing the sample data and an enumeration indicating the type of debug sample.

Field	Display Name	Type	Notes
sample	Sample Data	long[]	An array of long values representing the debug sample data.
debugSampleType	Debug Sample Type	RemoteDebugSampleType	An enumeration indicating the type of debug sample being sent.

0x1b Delete Chat Message Packet

This packet is used to delete a specific chat message on the client side. It is sent from the server to the client to instruct the client to remove a chat message identified by its signature.

Field	Display Name	Type	Notes
messageSignature	Message Signature	MessageSignature.Packed	This field contains the packed signature of the message that needs to be deleted. It uniquely identifies the chat message to be removed.

0x1c Client Disconnect Packet

This packet is sent from the server to the client to indicate that the client is being disconnected from the server. The reason for the disconnection is provided as a message component.

Field	Display Name	Type	Notes
reason	Disconnection Reason	Component	This field contains the reason for the disconnection, represented as a Component. It is serialized and deserialized using the ComponentSerialization.TRUSTED_CONTEXT_FREE_STREAM_CODEC.

0x1d Disguised Chat Packet

This packet is used to send a chat message to the client with a specific chat type, allowing for disguised or formatted chat messages.

Field	Display Name	Type	Notes
message	Chat Message	Component	The actual chat message content that will be sent to the client. It is serialized using the ComponentSerialization.TRUSTED_STREAM_CODEC.
chatType	Chat Type	ChatType.Bound	Defines the type of chat message, such as system or player chat, and is serialized using ChatType.Bound.STREAM_CODEC.

0x1e Entity Event Notification Packet

This packet is used to notify the client about an event related to a specific entity in the game world. It carries information about the entity and the type of event that occurred.

Field	Display Name	Type	Notes
entityId	Entity Identifier	int	This field holds the unique identifier for the entity that the event is related to. It is used to locate the entity within the game world.
eventId	Event Identifier	byte	This field specifies the type of event that has occurred. Different values correspond to different events, such as entity actions or state changes.

0x1f Entity Position Synchronization Packet

This packet is used to synchronize the position and movement of an entity with the client. It ensures that the client has the correct position, movement, and rotation data for an entity, as well as whether the entity is on the ground.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity whose position is being synchronized.
values	Position and Movement Data	PositionMoveRotation	Contains the position, movement vector, and rotation angles (yaw and pitch) of the entity.
onGround	On Ground Status	Bool	Indicates whether the entity is currently on the ground.

0x20 Explosion Event Packet

This packet is sent from the server to the client to notify about an explosion event in the game world. It contains information about the explosion's location, the effect on the player, the type of particle used for the explosion, and the sound associated with it.

Field	Display Name	Type	Notes
center	Explosion Center	Vec3	The central point of the explosion in the game world, represented as a 3D vector.
playerKnockback	Player Knockback Effect	Optional<Vec3>	An optional 3D vector indicating the knockback effect on the player due to the explosion. If present, it specifies the direction and magnitude of the knockback.
explosionParticle	Explosion Particle Type	ParticleOptions	Specifies the type of particle effect used to visually represent the explosion.
explosionSound	Explosion Sound Event	Holder<SoundEvent>	The sound event associated with the explosion, providing an auditory cue for the explosion event.

0x21 Forget Level Chunk Packet

This packet is sent from the server to the client to indicate that a specific chunk should be forgotten or unloaded by the client. This is typically used when the client moves away from a chunk and no longer needs to keep it in memory.

Field	Display Name	Type	Notes
pos	Chunk Position	ChunkPos	This field represents the position of the chunk that should be forgotten. It is read from the buffer using the readChunkPos method and written using the writeChunkPos method.

0x22 Clientbound Game Event Packet

This packet is used to communicate various game events from the server to the client, such as changes in weather, game mode, or other significant game state changes.

Field	Display Name	Type	Notes
event	Event Type	ClientboundGameEventPacket.Type	Represents the type of game event being communicated. It is an instance of the nested Type class, which maps event IDs to their respective types.
param	Event Parameter	float	A parameter associated with the event, which can vary depending on the event type. For example, it might represent the intensity of rain or the specific demo hint being shown.
friendlybytebuf.readUnsignedByte()	Read Event Type ID	UnsignedByte	Reads the event type ID from the buffer, which is then used to retrieve the corresponding event type from the TYPES map.
friendlybytebuf.readFloat()	Read Event Parameter	Float	Reads the event parameter from the buffer, which provides additional context or data for the event.
friendlybytebuf.writeByte(this.event.id)	Write Event Type ID	Byte	Writes the event type ID to the buffer, allowing the client to identify the type of event being communicated.
friendlybytebuf.writeFloat(this.param)	Write Event Parameter	Float	Writes the event parameter to the buffer, providing the client with additional data related to the event.

0x23 Open Horse Inventory Screen

This packet is sent from the server to the client to open the horse inventory screen. It provides the necessary information to display the horse's inventory interface, including the container ID, the number of inventory columns, and the entity ID of the horse.

Field	Display Name	Type	Notes
containerId	Container ID	ContainerId	This field represents the unique identifier for the container that is being opened. It is used to track the specific inventory interface on the client side.
inventoryColumns	Inventory Columns	VarInt	This field indicates the number of columns in the horse's inventory. It determines how the inventory slots are arranged on the screen.
entityId	Entity ID	Int	This field specifies the unique identifier of the horse entity whose inventory is being accessed. It is used to link the inventory interface to the correct horse entity in the game world.

0x24 Hurt Animation Packet

This packet is sent from the server to the client to indicate that a living entity has been hurt, triggering a hurt animation on the client side.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier of the living entity that has been hurt. This ID is used to identify which entity should display the hurt animation.
yaw	Hurt Direction	Float	The direction from which the entity was hurt, represented as a yaw angle. This helps in determining the animation direction.

0x25 Initialize World Border Packet

This packet is used to initialize or update the world border settings for a client. It communicates the current and target states of the world border, including its size, position, and warning settings.

Field	Display Name	Type	Notes
newCenterX	New Center X Coordinate	Double	The X coordinate of the new center of the world border.
newCenterZ	New Center Z Coordinate	Double	The Z coordinate of the new center of the world border.
oldSize	Old Border Size	Double	The current size of the world border before any changes.
newSize	New Border Size	Double	The target size of the world border after changes.
lerpTime	Lerp Time	VarLong	The time in ticks over which the border will transition from the old size to the new size.
newAbsoluteMaxSize	New Absolute Maximum Size	VarInt	The new maximum size limit for the world border.
warningBlocks	Warning Blocks Distance	VarInt	The distance in blocks from the border at which a warning is triggered.
warningTime	Warning Time	VarInt	The time in seconds before a player reaches the border when a warning is triggered.

0x26 Keep Alive Packet

This packet is used to ensure that the connection between the client and server is still active. It is sent periodically to check if the client is still responsive.

Field	Display Name	Type	Notes
id	Keep Alive ID	long	A unique identifier for the keep alive packet. This ID is used to match the keep alive request with the response.

0x27 Chunk and Light Data Transmission

This packet is responsible for sending chunk data along with lighting information from the server to the client. It is used to update the client with the current state of a chunk, including its blocks and lighting conditions.

Field	Display Name	Type	Notes
x	Chunk X Coordinate	int	The X coordinate of the chunk position in the world.
z	Chunk Z Coordinate	int	The Z coordinate of the chunk position in the world.
chunkData	Chunk Data	ClientboundLevelChunkPacketData	Contains the data for the chunk, including block states and other relevant information.
lightData	Light Data	ClientboundLightUpdatePacketData	Contains the lighting data for the chunk, including sky and block light levels.

0x28 Client Level Event Packet

This packet is used to notify the client about a level event occurring at a specific position in the game world. It can be a global event or localized to a specific position.

Field	Display Name	Type	Notes
type	Event Type	Int	An integer representing the type of event. This could correspond to various in-game events like sound effects, particle effects, etc.
pos	Event Position	BlockPos	The position in the game world where the event is occurring. This is immutable and represents the exact block location.
data	Event Data	Int	Additional data related to the event. The meaning of this data depends on the event type.
globalEvent	Is Global Event	Boolean	A boolean indicating whether the event is global (affecting all players) or localized to a specific area.

0x29 Packet for Sending Particle Effects to Client

This packet is used to send particle effect data from the server to the client, allowing the client to render particle effects at specified coordinates with given properties.

Field	Display Name	Type	Notes
overrideLimiter	Override Particle Limiter	Boolean	Determines if the particle limiter should be overridden, allowing more particles to be displayed than usual.
alwaysShow	Always Show Particles	Boolean	Indicates whether the particles should always be shown, regardless of the player's settings.
x	X Coordinate	Double	The X coordinate where the particles will be displayed.
y	Y Coordinate	Double	The Y coordinate where the particles will be displayed.
z	Z Coordinate	Double	The Z coordinate where the particles will be displayed.
xDist	X Distance	Float	The distance along the X axis that the particles can spread.
yDist	Y Distance	Float	The distance along the Y axis that the particles can spread.
zDist	Z Distance	Float	The distance along the Z axis that the particles can spread.
maxSpeed	Maximum Speed	Float	The maximum speed at which the particles can move.
count	Particle Count	Int	The number of particles to be displayed.
particle	Particle Type	ParticleOptions	The type of particle to be displayed, defined by the ParticleOptions interface.

0x2a Light Update Packet

This packet is sent from the server to the client to update the lighting information for a specific chunk in the game world. It ensures that the client has the correct lighting data for rendering purposes.

Field	Display Name	Type	Notes
x	Chunk X Coordinate	VarInt	The X coordinate of the chunk for which the lighting update is being sent.
z	Chunk Z Coordinate	VarInt	The Z coordinate of the chunk for which the lighting update is being sent.
lightData	Lighting Data	ClientboundLightUpdatePacketData	Contains the detailed lighting information for the specified chunk, including any changes in light levels.

0x2b Client Login Packet

This packet is sent from the server to the client during the login process. It contains essential information about the player's session and the game environment.

Field	Display Name	Type	Notes
playerId	Player ID	int	Unique identifier for the player.
hardcore	Hardcore Mode	boolean	Indicates if the game is in hardcore mode.
levels	Available Levels	Set<ResourceKey<Level>>	Set of levels (dimensions) available to the player.
maxPlayers	Maximum Players	VarInt	Maximum number of players allowed in the game.
chunkRadius	Chunk Radius	VarInt	Radius of chunks loaded around the player.
simulationDistance	Simulation Distance	VarInt	Distance within which game mechanics are active.
reducedDebugInfo	Reduced Debug Info	boolean	Indicates if the debug screen shows reduced information.
showDeathScreen	Show Death Screen	boolean	Determines if the death screen is shown upon player death.
doLimitedCrafting	Limited Crafting	boolean	Indicates if crafting is limited to known recipes.
commonPlayerSpawnInfo	Common Player Spawn Info	CommonPlayerSpawnInfo	Contains information about the player's spawn point.
enforcesSecureChat	Enforces Secure Chat	boolean	Indicates if secure chat is enforced.

0x2c Map Item Data Packet

This packet is used to send map data from the server to the client, including map ID, scale, lock status, decorations, and color patches.

Field	Display Name	Type	Notes
mapId	Map Identifier	MapId	Unique identifier for the map being updated.
scale	Map Scale	byte	The scale of the map, determining the level of detail.
locked	Map Lock Status	boolean	Indicates whether the map is locked and cannot be modified.
decorations	Map Decorations	Optional<List<MapDecoration>>	Optional list of decorations to be added to the map, such as markers or icons.
colorPatch	Map Color Patch	Optional<MapItemSavedData.MapPatch>	Optional color patch data to be applied to the map, altering its appearance.

0x2d Merchant Offers Packet

This packet is sent from the server to the client to provide information about the trading offers available from a villager or merchant. It includes details about the offers, the villager's level, experience, and other relevant trading information.

Field	Display Name	Type	Notes
containerId	Container ID	ContainerId	Unique identifier for the trading interface or container.
offers	Merchant Offers	MerchantOffers	A list of trade offers available from the merchant, encoded using the MerchantOffers codec.
villagerLevel	Villager Level	VarInt	The current level of the villager, which affects the types of trades available.
villagerXp	Villager Experience	VarInt	The experience points of the villager, which can influence leveling up.
showProgress	Show Progress	Boolean	Indicates whether the progress bar should be displayed to show the villager's level progress.
canRestock	Can Restock	Boolean	Indicates whether the villager can restock their trades.

0x2e Entity Movement Packet

This packet is used to update the position and/or rotation of an entity on the client side. It is sent from the server to the client to synchronize entity movements.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	Unique identifier for the entity being moved.
xa	X-Axis Movement	Short	Change in position along the X-axis.
ya	Y-Axis Movement	Short	Change in position along the Y-axis.
za	Z-Axis Movement	Short	Change in position along the Z-axis.
yRot	Yaw Rotation	Byte	Rotation around the Y-axis (horizontal rotation).
xRot	Pitch Rotation	Byte	Rotation around the X-axis (vertical rotation).
onGround	On Ground Status	Boolean	Indicates whether the entity is on the ground.
hasRot	Has Rotation	Boolean	Indicates if the packet includes rotation data.
hasPos	Has Position	Boolean	Indicates if the packet includes position data.

0x2f Entity Movement Packet

This packet is used to update the position and/or rotation of an entity on the client side. It is sent from the server to the client to synchronize entity movements.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	Unique identifier for the entity being moved.
xa	X-Axis Movement	Short	Change in position along the X-axis.
ya	Y-Axis Movement	Short	Change in position along the Y-axis.
za	Z-Axis Movement	Short	Change in position along the Z-axis.
yRot	Yaw Rotation	Byte	Rotation around the Y-axis (horizontal rotation).
xRot	Pitch Rotation	Byte	Rotation around the X-axis (vertical rotation).
onGround	On Ground Status	Boolean	Indicates whether the entity is on the ground.
hasRot	Has Rotation	Boolean	Indicates if the packet includes rotation data.
hasPos	Has Position	Boolean	Indicates if the packet includes position data.

0x30 Move Minecart Packet

This packet is used to update the client about the movement of a minecart along a track. It provides the necessary data to interpolate the minecart's position smoothly on the client side.

Field	Display Name	Type	Notes
entityId	Entity ID	VarInt	The unique identifier for the minecart entity being moved. This ID is used to reference the specific minecart within the game world.
lerpSteps	Lerp Steps	List<NewMinecartBehavior.MinecartStep>	A list of steps that define the interpolation (lerp) behavior for the minecart's movement. This allows for smooth transitions between positions on the client side.

0x31 Entity Movement Packet

This packet is used to update the position and/or rotation of an entity on the client side. It is sent from the server to the client to synchronize entity movements.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	Unique identifier for the entity being moved.
xa	X-Axis Movement	Short	Change in position along the X-axis.
ya	Y-Axis Movement	Short	Change in position along the Y-axis.
za	Z-Axis Movement	Short	Change in position along the Z-axis.
yRot	Yaw Rotation	Byte	Rotation around the Y-axis (horizontal rotation).
xRot	Pitch Rotation	Byte	Rotation around the X-axis (vertical rotation).
onGround	On Ground Status	Boolean	Indicates whether the entity is on the ground.
hasRot	Has Rotation	Boolean	Indicates if the packet includes rotation data.
hasPos	Has Position	Boolean	Indicates if the packet includes position data.

0x32 Vehicle Movement Update Packet

This packet is sent from the server to the client to update the position and rotation of a vehicle entity that the player is controlling. It ensures that the client has the correct position and orientation of the vehicle in the game world.

Field	Display Name	Type	Notes
position	Vehicle Position	Vec3	This field represents the 3D coordinates (x, y, z) of the vehicle's position in the game world.
yRot	Yaw Rotation	float	This field represents the yaw rotation of the vehicle, which is the rotation around the vertical axis.
xRot	Pitch Rotation	float	This field represents the pitch rotation of the vehicle, which is the rotation around the horizontal axis.

0x33 Open Book Packet

This packet is sent from the server to the client to instruct the client to open a book in the player's hand.

Field	Display Name	Type	Notes
hand	Interaction Hand	Enum<InteractionHand>	Indicates which hand (main or offhand) is holding the book to be opened.

0x34 Open Screen Packet

This packet is sent from the server to the client to open a new screen or GUI (Graphical User Interface) for the player. It specifies the type of screen to open, the title of the screen, and a unique container ID for the session.

Field	Display Name	Type	Notes
containerId	Container ID	int	A unique identifier for the container session. It is used to distinguish between different open screens or GUIs.
type	Menu Type	MenuType<?>	Specifies the type of menu or screen to be opened. It is retrieved from the game's registry of menu types.
title	Screen Title	Component	The title of the screen or GUI, which is displayed to the player. It is serialized using the ComponentSerialization.TRUSTED_STREAM_CODEC.

0x35 Open Sign Editor Packet

This packet is sent from the server to the client to open the sign editor interface at a specific block position. It indicates whether the text being edited is on the front of the sign.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	The position of the block where the sign editor should be opened. This is a 3D coordinate in the game world.
isFrontText	Is Front Text	boolean	A boolean flag indicating whether the text being edited is on the front side of the sign.

0x36 Ping Packet from Server to Client

This packet is used to send a ping request from the server to the client. It is part of the network protocol to measure latency or ensure connectivity between the client and server.

Field	Display Name	Type	Notes
id	Ping Identifier	int	This is an integer value that uniquely identifies the ping request. It is used to match the ping response with the request.

0x37 Pong Response Packet

This packet is sent from the server to the client as a response to a ping request. It is used to measure the latency between the client and the server.

Field	Display Name	Type	Notes
time	Timestamp	long	This field contains the timestamp that was sent by the client in the ping request. It is used to calculate the round-trip time.

0x38 Packet for Placing Ghost Recipe

This packet is sent from the server to the client to place a ghost recipe in the crafting interface. It is used to visually display a recipe without actually crafting the items.

Field	Display Name	Type	Notes
containerId	Container Identifier	int	This field represents the ID of the container (e.g., crafting table, inventory) where the ghost recipe is to be placed.
recipeDisplay	Recipe Display	RecipeDisplay	This field contains the recipe information to be displayed as a ghost recipe. It includes details about the items and their arrangement.

0x39 Player Abilities Update Packet

This packet is used to update the player's abilities on the client side, such as invulnerability, flying capability, and movement speeds.

Field	Display Name	Type	Notes
invulnerable	Invulnerability Flag	byte	Determines if the player is invulnerable. This is represented by the first bit in the byte.
isFlying	Flying Status Flag	byte	Indicates if the player is currently flying. This is represented by the second bit in the byte.
canFly	Can Fly Flag	byte	Indicates if the player has the ability to fly. This is represented by the third bit in the byte.
instabuild	Instant Build Flag	byte	Indicates if the player can build instantly. This is represented by the fourth bit in the byte.
flyingSpeed	Flying Speed	float	The speed at which the player can fly.
walkingSpeed	Walking Speed	float	The speed at which the player can walk.

0x3a Player Chat Packet

This packet is used to send chat messages from the server to the client, including information about the sender, message content, and any applicable filters or signatures.

Field	Display Name	Type	Notes
sender	Sender UUID	UUID	The unique identifier of the player who sent the message.
index	Message Index	VarInt	An integer representing the order or sequence of the message.
signature	Message Signature	MessageSignature	Optional cryptographic signature of the message for verification purposes.
body	Signed Message Body	SignedMessageBody.Packed	The packed body of the signed message, containing the actual content.
unsignedContent	Unsigned Message Content	Component	Optional raw message content without any signature.
filterMask	Filter Mask	FilterMask	Indicates which parts of the message are filtered or censored.
chatType	Chat Type	ChatType.Bound	Specifies the type of chat (e.g., system, game, etc.) and its context.

0x3b Player Combat End Notification

This packet is sent from the server to the client to notify that a player's combat session has ended. It includes the duration of the combat session.

Field	Display Name	Type	Notes
duration	Combat Duration	VarInt	Represents the length of the combat session in ticks. This value is read from the buffer using readVarInt and written using writeVarInt.

0x3c Player Combat Enter Notification

This packet is sent from the server to the client to notify that the player has entered combat mode. It is used to trigger any client-side effects or UI changes related to combat.

Field	Display Name	Type	Notes
INSTANCE	Singleton Instance	ClientboundPlayerCombatEnterPacket	A singleton instance of the packet, used to avoid creating multiple instances since the packet does not carry any data.
STREAM_CODEC	Stream Codec	StreamCodec<ByteBuf ClientboundPlayerCombatEnterPacket>	A codec for encoding and decoding the packet, using a unit codec since the packet has no data fields.

0x3d Player Combat Kill Notification

This packet is sent from the server to the client to notify that a player has been killed in combat. It includes the player's ID and a message component that can contain additional information about the kill.

Field	Display Name	Type	Notes
playerId	Player ID	VarInt	The unique identifier for the player who was killed. This is used to reference the player within the game.
message	Kill Message	Component	A chat component that contains the message related to the player's death. This can include details such as who killed the player or the method of death.

0x3e Player Info Removal Packet

This packet is used to remove player information from the client, typically when a player leaves the game or is no longer relevant to the client.

Field	Display Name	Type	Notes
profileIds	Profile Identifiers	List<UUID>	A list of UUIDs representing the players whose information should be removed from the client.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ClientboundPlayerInfoRemovePacket>	A codec used for encoding and decoding the packet data.
friendlybytebuf.readList(UUIDUtil.STREAM_CODEC)	Read Profile IDs	List<UUID>	Reads a list of UUIDs from the buffer using the UUIDUtil codec.
friendlybytebuf.writeCollection(this.profileIds, UUIDUtil.STREAM_CODEC)	Write Profile IDs	void	Writes the list of UUIDs to the buffer using the UUIDUtil codec.

0x3f Player Information Update Packet

This packet is used to update the client with information about players, such as their game mode, latency, display name, and other attributes. It is typically sent when a player joins, leaves, or changes state in the game.

Field	Display Name	Type	Notes
actions	Actions Set	EnumSet<ClientboundPlayerInfoUpdatePacket.Action>	A set of actions that describe what information is being updated for the players.
entries	Player Entries	List<ClientboundPlayerInfoUpdatePacket.Entry>	A list of entries, each representing a player and their updated information.
write	Write Method	void write(RegistryFriendlyByteBuf registryfriendlybytebuf)	Writes the packet data to the buffer, including the actions and player entries.
readEnumSet	Read Enum Set	EnumSet<ClientboundPlayerInfoUpdatePacket.Action> readEnumSet(Class<ClientboundPlayerInfoUpdatePacket.Action> clazz)	Reads a set of actions from the buffer.
readList	Read List	List<ClientboundPlayerInfoUpdatePacket.Entry> readList(Function<FriendlyByteBuf ClientboundPlayerInfoUpdatePacket.Entry> function)	Reads a list of player entries from the buffer.
writeEnumSet	Write Enum Set	void writeEnumSet(EnumSet<ClientboundPlayerInfoUpdatePacket.Action> actions Class<ClientboundPlayerInfoUpdatePacket.Action> clazz)	Writes the set of actions to the buffer.
writeCollection	Write Collection	void writeCollection(Collection<ClientboundPlayerInfoUpdatePacket.Entry> entries BiConsumer<FriendlyByteBuf ClientboundPlayerInfoUpdatePacket.Entry> consumer)	Writes the collection of player entries to the buffer.

0x40 Player Look At Packet

This packet is used to instruct the client to make the player's camera look at a specific point in the world or at a specific entity.

Field	Display Name	Type	Notes
fromAnchor	Source Anchor	EntityAnchorArgument.Anchor	The anchor point on the player from which the look direction is calculated.
x	Target X Coordinate	double	The X coordinate of the target point in the world.
y	Target Y Coordinate	double	The Y coordinate of the target point in the world.
z	Target Z Coordinate	double	The Z coordinate of the target point in the world.
entity	Target Entity ID	VarInt	The ID of the entity to look at, if applicable.
toAnchor	Target Anchor	EntityAnchorArgument.Anchor	The anchor point on the target entity to look at, if applicable.
atEntity	Is Target an Entity	boolean	Indicates whether the target is an entity or a point in the world.

0x41 Player Position Update Packet

This packet is sent from the server to the client to update the player's position and rotation in the game world. It includes information about the player's new position, rotation, and any relative movement changes.

Field	Display Name	Type	Notes
id	Packet ID	VarInt	A unique identifier for the packet, used to distinguish it from other packets.
change	Position and Rotation Change	PositionMoveRotation	Contains the new position and rotation data for the player.
relatives	Relative Movement Set	Set<Relative>	A set of relative movement flags indicating which components of the player's position or rotation have changed.

0x42 Player Rotation Update Packet

This packet is sent from the server to the client to update the player's rotation in the game world. It informs the client of the new yaw and pitch angles for the player's view.

Field	Display Name	Type	Notes
yRot	Yaw Rotation	FLOAT	The yaw rotation angle of the player, representing the horizontal rotation.
xRot	Pitch Rotation	FLOAT	The pitch rotation angle of the player, representing the vertical rotation.

0x43 Add Recipes to Client's Recipe Book

This packet is sent from the server to the client to add new recipes to the client's recipe book. It can either add new entries or replace existing ones based on the 'replace' flag.

Field	Display Name	Type	Notes
entries	List of Recipe Entries	List<ClientboundRecipeBookAddPacket.Entry>	Contains the recipes to be added to the client's recipe book. Each entry includes the recipe details and flags for notification and highlight.
replace	Replace Existing Recipes Flag	boolean	Indicates whether the existing recipes should be replaced with the new entries.

0x44 Remove Recipes from Recipe Book

This packet is sent from the server to the client to remove specific recipes from the client's recipe book.

Field	Display Name	Type	Notes
recipes	List of Recipes to Remove	List<RecipeDisplayId>	This field contains a list of RecipeDisplayId objects representing the recipes to be removed from the client's recipe book.

0x45 Recipe Book Settings Update Packet

This packet is used to update the client's recipe book settings, such as toggling the visibility of certain recipes or changing the filtering options.

Field	Display Name	Type	Notes
bookSettings	Recipe Book Settings	RecipeBookSettings	Contains the settings for the recipe book, such as whether to show all recipes or only craftable ones.

0x46 Remove Entities Packet

This packet is sent from the server to the client to inform the client that certain entities should be removed from the world.

Field	Display Name	Type	Notes
entityIds	Entity IDs	IntList	A list of entity IDs that are to be removed from the client's world.
write	Write Method	FriendlyByteBuf	Writes the list of entity IDs to the buffer, which will be sent to the client.

0x47 Remove Mob Effect Packet

This packet is sent from the server to the client to inform the client that a specific mob effect has been removed from an entity.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	The unique identifier for the entity from which the mob effect is being removed. This ID is used to locate the entity within the game world.
effect	Mob Effect Holder	Holder<MobEffect>	The specific mob effect that is being removed. This is a holder object that references the type of effect being removed from the entity.

0x48 Reset Score Packet

This packet is used to reset the score of a player in a specific objective. It is sent from the server to the client to indicate that the score for a particular player should be reset.

Field	Display Name	Type	Notes
owner	Score Owner	Utf	The name of the player whose score is being reset. This is a UTF-8 string.
objectiveName	Objective Name	Nullable<Utf>	The name of the objective for which the score is being reset. This is a nullable UTF-8 string, meaning it can be null if no specific objective is targeted.

0x49 Resource Pack Pop Notification

This packet is sent from the server to the client to notify about a resource pack pop event, which may involve the removal or change of a resource pack.

Field	Display Name	Type	Notes
id	Resource Pack Identifier	Optional<UUID>	This field contains an optional UUID that uniquely identifies the resource pack. If present, it specifies the resource pack that is being popped.

0x4a Resource Pack Push Packet

This packet is sent from the server to the client to prompt the client to download and apply a resource pack. It includes details such as the resource pack's URL, a hash for verification, and whether the resource pack is required.

Field	Display Name	Type	Notes
id	Resource Pack ID	UUID	A unique identifier for the resource pack, used to track and manage the resource pack download.
url	Resource Pack URL	String	The URL from which the client can download the resource pack.
hash	Resource Pack Hash	String	A hash of the resource pack file, used to verify the integrity of the downloaded file. The hash must not exceed 40 characters.
required	Is Resource Pack Required	boolean	Indicates whether the resource pack is mandatory for the client to use. If true, the client must accept the resource pack to continue.
prompt	Resource Pack Prompt	Optional<Component>	An optional message to display to the client when prompting them to download the resource pack. This can be used to provide additional context or instructions.

0x4b Clientbound Respawn Packet

This packet is sent from the server to the client to handle the respawn of a player. It includes information about the player's spawn state and what data should be retained during the respawn process.

Field	Display Name	Type	Notes
commonPlayerSpawnInfo	Common Player Spawn Info	CommonPlayerSpawnInfo	Contains information about the player's spawn state, such as location and dimension.
dataToKeep	Data to Keep	byte	A byte flag indicating which data should be retained during the respawn. Possible values are KEEP_ATTRIBUTE_MODIFIERS, KEEP_ENTITY_DATA, and KEEP_ALL_DATA.

0x4c Packet for Rotating Entity Head

This packet is used to update the client with the new head rotation of an entity. It informs the client about the change in the direction the entity's head is facing.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	The unique identifier for the entity whose head rotation is being updated. This ID is used to locate the entity within the game world.
yHeadRot	Yaw Head Rotation	Byte	The new head rotation angle for the entity, represented as a byte. This value is used to determine the direction the entity's head is facing.

0x4d Section Blocks Update Packet

This packet is used to update multiple block states within a specific section of a chunk on the client side. It is sent from the server to the client to inform about changes in block states within a section.

Field	Display Name	Type	Notes
sectionPos	Section Position	SectionPos	Represents the position of the section within the world. It is used to determine the exact location of the block updates.
positions	Block Positions	short[]	An array of short values representing the relative positions of the blocks within the section. Each short value encodes the x, y, and z coordinates of a block within the section.
states	Block States	BlockState[]	An array of BlockState objects representing the new states of the blocks at the corresponding positions.

0x4e Select Advancements Tab Packet

This packet is sent from the server to the client to select a specific advancements tab in the player's GUI. It allows the server to control which advancements tab is currently being displayed to the player.

Field	Display Name	Type	Notes
tab	Selected Advancements Tab	ResourceLocation	This field holds the ResourceLocation of the advancements tab that should be selected. It can be null, indicating that no specific tab should be selected.

0x4f Server Data Packet

This packet is sent from the server to the client to provide server-related data, such as the message of the day (MOTD) and an optional server icon.

Field	Display Name	Type	Notes
motd	Message of the Day	Component	This field contains the message of the day, which is a text component that can be displayed to the client.
iconBytes	Server Icon	Optional<byte[]>	This field contains the server icon in byte array form, if available. It is optional and may not be present.

0x50 Set Action Bar Text Packet

This packet is used to set the text displayed in the action bar for the client.

Field	Display Name	Type	Notes
text	Action Bar Text	Component	The text to be displayed in the action bar. It is serialized using the ComponentSerialization.TRUSTED_STREAM_CODEC.

0x51 Set World Border Center

This packet is used to update the center position of the world border on the client side. It informs the client about the new coordinates of the world border's center.

Field	Display Name	Type	Notes
newCenterX	New Center X Coordinate	double	The X coordinate of the new center of the world border.
newCenterZ	New Center Z Coordinate	double	The Z coordinate of the new center of the world border.

0x52 Packet to Adjust World Border Size Over Time

This packet is used to adjust the size of the world border over a specified period of time. It communicates the transition from the current size to a new target size, along with the duration of this transition.

Field	Display Name	Type	Notes
oldSize	Current Border Size	Double	Represents the current size of the world border before the transition begins.
newSize	Target Border Size	Double	Represents the new size that the world border will transition to.
lerpTime	Transition Duration	VarLong	Specifies the time in milliseconds over which the border size transition will occur.

0x53 Set World Border Size Packet

This packet is used to set the size of the world border on the client side. It communicates the new size of the world border to the client.

Field	Display Name	Type	Notes
size	World Border Size	double	This field represents the target size of the world border. It is a double value that specifies the new size to which the world border should be set.

0x54 Set Border Warning Delay Packet

This packet is used to set the warning delay for the world border in the game. It informs the client about the time delay before the world border starts to shrink or expand.

Field	Display Name	Type	Notes
warningDelay	Warning Delay	VarInt	This field represents the delay time in seconds before the world border warning is triggered. It is read from the buffer using readVarInt and written using writeVarInt.

0x55 Set Border Warning Distance Packet

This packet is used to set the warning distance for the world border in the game. It informs the client about how many blocks away from the world border the warning should start.

Field	Display Name	Type	Notes
warningBlocks	Warning Blocks	VarInt	This field represents the number of blocks from the world border where the warning will be triggered. It is read from the buffer using readVarInt and written using writeVarInt.

0x56 Set Camera Packet

This packet is used to set the player's camera to a specific entity, allowing the player to view the game world from the perspective of that entity.

Field	Display Name	Type	Notes
cameraId	Camera Entity ID	VarInt	This field stores the ID of the entity that the camera should focus on. It is used to identify the entity within the game world.

0x57 Set Chunk Cache Center Packet

This packet is used to set the center of the chunk cache for the client. It informs the client about the new center chunk coordinates, which helps in managing the rendering and loading of chunks around the player.

Field	Display Name	Type	Notes
x	Chunk X Coordinate	VarInt	The X coordinate of the chunk that is set as the center of the cache.
z	Chunk Z Coordinate	VarInt	The Z coordinate of the chunk that is set as the center of the cache.

0x58 Set Chunk Cache Radius Packet

This packet is sent from the server to the client to update the chunk cache radius, which determines how many chunks around the player are loaded and sent to the client.

Field	Display Name	Type	Notes
radius	Chunk Cache Radius	VarInt	This field represents the radius of chunks around the player that should be loaded. It is read from the buffer using readVarInt and written using writeVarInt.

0x59 Set Cursor Item Packet

This packet is used to update the item currently held by the player's cursor in the inventory interface.

Field	Display Name	Type	Notes
contents	Cursor Item Contents	ItemStack	Represents the item stack that is being set to the player's cursor. This can be an optional value, meaning it might be empty if no item is being held.

0x5a Set Default Spawn Position Packet

This packet is used to set the default spawn position for a player in the game. It communicates the coordinates and orientation angle of the spawn point to the client.

Field	Display Name	Type	Notes
pos	Spawn Position	BlockPos	The coordinates of the default spawn position in the game world. It is represented as a BlockPos object, which includes x, y, and z coordinates.
angle	Spawn Angle	float	The orientation angle at which the player will face when they spawn. It is a float value representing the yaw angle.

0x5b Set Display Objective Packet

This packet is used to set the display objective for a specific display slot in the game. It communicates which objective should be displayed in a particular slot on the client side.

Field	Display Name	Type	Notes
slot	Display Slot	DisplaySlot	This field represents the display slot where the objective will be shown. It is read from the buffer using the readById method and written using the writeById method.
objectiveName	Objective Name	String	This field contains the name of the objective to be displayed. If no objective is provided, it defaults to an empty string. It is read from the buffer using the readUtf method and written using the writeUtf method.

0x5c Entity Data Update Packet

This packet is used to update the data of an entity on the client side. It sends a list of data values associated with a specific entity ID, allowing the client to synchronize its state with the server.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity whose data is being updated.
packedItems	Packed Data Values	List<SynchedEntityData.DataValue<?>>	A list of data values that represent the updated state of the entity. Each data value is packed and sent to the client.

0x5d Entity Link Update Packet

This packet is used to update the client about the linking or unlinking of two entities in the game world. It communicates the relationship between a source entity and a destination entity, which can be used for actions like mounting or dismounting.

Field	Display Name	Type	Notes
sourceId	Source Entity ID	int	The unique identifier for the source entity involved in the link. This is the entity that is being linked to another entity.
destId	Destination Entity ID	int	The unique identifier for the destination entity involved in the link. If the destination entity is null, this ID is set to 0, indicating that the source entity is not linked to any other entity.

0x5e Set Entity Motion Packet

This packet is used to update the motion of an entity on the client side. It communicates the velocity of an entity in the game world to the client, allowing for synchronized movement across the network.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity whose motion is being updated. This ID is used to match the motion data to the correct entity on the client side.
xa	X-Axis Motion	Short	The motion of the entity along the X-axis, scaled by a factor of 8000. This value is clamped between -3.9 and 3.9 before scaling.
ya	Y-Axis Motion	Short	The motion of the entity along the Y-axis, scaled by a factor of 8000. This value is clamped between -3.9 and 3.9 before scaling.
za	Z-Axis Motion	Short	The motion of the entity along the Z-axis, scaled by a factor of 8000. This value is clamped between -3.9 and 3.9 before scaling.

0x5f Set Equipment Packet

This packet is sent from the server to the client to update the equipment of a specific entity. It informs the client about changes in the equipment slots of an entity, such as when an item is equipped or unequipped.

Field	Display Name	Type	Notes
entity	Entity ID	VarInt	The unique identifier of the entity whose equipment is being updated.
slots	Equipment Slots	List<Pair<EquipmentSlot ItemStack>>	A list of pairs, each containing an equipment slot and the corresponding item stack. This represents the equipment changes for the entity.

0x60 Packet for setting player experience

This packet is sent from the server to the client to update the player's experience bar, total experience, and experience level.

Field	Display Name	Type	Notes
experienceProgress	Experience Progress	Float	Represents the progress towards the next experience level, ranging from 0.0 to 1.0.
experienceLevel	Experience Level	VarInt	The current experience level of the player.
totalExperience	Total Experience	VarInt	The total amount of experience points the player has accumulated.

0x61 Update Player Health Status

This packet is sent from the server to the client to update the player's health, food level, and saturation. It ensures that the client has the correct information about the player's current health status.

Field	Display Name	Type	Notes
health	Player Health	Float	Represents the player's current health level. It is a floating-point number that typically ranges from 0.0 to 20.0, where 20.0 is full health.
food	Food Level	VarInt	Indicates the player's current food level. This is an integer value that usually ranges from 0 to 20, where 20 is a full food bar.
saturation	Saturation Level	Float	Represents the player's saturation level, which affects how quickly the food level depletes. It is a floating-point number that can vary based on the player's actions and food consumption.

0x62 Set Held Slot Packet

This packet is sent from the server to the client to update the currently selected hotbar slot for the player.

Field	Display Name	Type	Notes
slot	Selected Slot Index	VarInt	This field represents the index of the hotbar slot that the player has selected. It is an integer value that corresponds to the position in the player's hotbar.

0x63 Objective Management Packet

This packet is used to manage objectives in the game, allowing for adding, removing, or changing objectives.

Field	Display Name	Type	Notes
objectiveName	Objective Name	Utf	The name of the objective being managed.
method	Operation Method	Byte	Indicates the operation to perform: 0 for add, 1 for remove, 2 for change.
displayName	Display Name	Component	The display name of the objective, used when adding or changing an objective.
renderType	Render Type	Enum<ObjectiveCriteria.RenderType>	Specifies how the objective should be rendered, applicable for add or change methods.
numberFormat	Number Format	Optional<NumberFormat>	Optional formatting for numbers associated with the objective, used when adding or changing.

0x64 Packet to Set Entity Passengers

This packet is used to update the client with the current passengers of a vehicle entity. It informs the client about which entities are riding a particular vehicle entity.

Field	Display Name	Type	Notes
vehicle	Vehicle Entity ID	VarInt	The ID of the vehicle entity that has passengers.
passengers	Passenger Entity IDs	VarIntArray	An array of entity IDs representing the passengers riding the vehicle.

0x65 Update Player Inventory Slot

This packet is used to update the contents of a specific inventory slot for a player on the client side. It informs the client about changes in the player's inventory, such as when an item is added, removed, or modified in a particular slot.

Field	Display Name	Type	Notes
slot	Inventory Slot Index	VarInt	This field represents the index of the inventory slot that is being updated. It is encoded as a variable-length integer (VarInt).
contents	Item Stack Contents	ItemStack	This field contains the item stack that is to be placed in the specified inventory slot. It uses the ItemStack's optional stream codec for serialization.

0x66 Manage Player Team Packet

This packet is used to manage player teams in the game. It can add, remove, or modify teams and their members.

Field	Display Name	Type	Notes
method	Operation Method	int	Determines the type of operation: add, remove, change, join, or leave a team.
name	Team Name	String	The name of the team being modified.
players	Player List	Collection<String>	A list of players affected by the operation.
parameters	Team Parameters	Optional<ClientboundSetPlayerTeamPacket.Parameters>	Optional parameters for the team, such as display name, prefix, suffix, etc.

0x67 Set Score Packet

This packet is used to update the score of a player or entity in a specific objective.

Field	Display Name	Type	Notes
owner	Score Owner	String	The name of the player or entity whose score is being updated.
objectiveName	Objective Name	String	The name of the objective to which the score belongs.
score	Score Value	VarInt	The new score value to be set for the owner in the specified objective.
display	Display Component	Optional<Component>	An optional component that may be used to display additional information about the score.
numberFormat	Number Format	Optional<NumberFormat>	An optional number format that specifies how the score should be displayed.

0x68 Set Simulation Distance Packet

This packet is used to set the simulation distance for the client, which determines how far the game world is simulated around the player.

Field	Display Name	Type	Notes
simulationDistance	Simulation Distance	VarInt	This field represents the distance in chunks that the server will simulate around the player. It is read from the buffer using readVarInt and written using writeVarInt.

0x69 Set Subtitle Text Packet

This packet is used to set the subtitle text on the client's screen. It is sent from the server to the client to update the subtitle text displayed in the game.

Field	Display Name	Type	Notes
text	Subtitle Text	Component	This field contains the text component that represents the subtitle to be displayed on the client's screen. It is serialized and deserialized using the ComponentSerialization.TRUSTED_STREAM_CODEC.

0x6a Set Time Packet

This packet is used to synchronize the game time and day time with the client. It informs the client about the current game time and day time, and whether the day time should be incremented with each tick.

Field	Display Name	Type	Notes
gameTime	Game Time	LONG	Represents the total time in ticks since the start of the world. This value is used to keep track of the overall progression of time in the game.
dayTime	Day Time	LONG	Indicates the time of day in ticks. This value resets every 24000 ticks, which corresponds to a full day-night cycle in Minecraft.
tickDayTime	Tick Day Time	BOOL	A boolean flag that determines whether the day time should be incremented with each tick. If true, the day time will progress normally; if false, it will remain static.

0x6b Set Title Text Packet

This packet is used to set the title text displayed to the player in the game. It sends a text component to the client, which is then displayed as a title on the player's screen.

Field	Display Name	Type	Notes
text	Title Text	Component	This field contains the text component that will be displayed as the title. It is serialized and deserialized using the ComponentSerialization.TRUSTED_STREAM_CODEC.

0x6c Set Titles Animation Packet

This packet is used to set the animation timings for titles displayed to the client. It specifies the duration for fade-in, stay, and fade-out animations of titles.

Field	Display Name	Type	Notes
fadeIn	Fade In Duration	Int	The duration in ticks for the title to fade in.
stay	Stay Duration	Int	The duration in ticks for the title to remain fully visible.
fadeOut	Fade Out Duration	Int	The duration in ticks for the title to fade out.

0x6d Sound Entity Packet

This packet is used to send sound events associated with entities to the client. It allows the client to play sounds that are tied to specific entities in the game world.

Field	Display Name	Type	Notes
sound	Sound Event	Holder<SoundEvent>	The sound event to be played, wrapped in a Holder for registry purposes.
source	Sound Source	SoundSource	The category of the sound, such as ambient, block, or player.
id	Entity ID	VarInt	The unique identifier of the entity associated with the sound.
volume	Volume	float	The volume level of the sound, where 1.0 is the normal volume.
pitch	Pitch	float	The pitch of the sound, where 1.0 is the normal pitch.
seed	Sound Seed	long	A random seed used for sound variation, ensuring that the same sound can have slight differences each time it is played.

0x6e Sound Event Packet

This packet is used to send sound events from the server to the client, allowing the client to play sounds at specific locations with given properties such as volume and pitch.

Field	Display Name	Type	Notes
sound	Sound Event	Holder<SoundEvent>	The sound event to be played, represented as a holder of a SoundEvent object.
source	Sound Source	SoundSource	The source category of the sound, such as music, weather, or player.
x	X Coordinate	int	The x-coordinate of the sound's location, multiplied by 8 for precision.
y	Y Coordinate	int	The y-coordinate of the sound's location, multiplied by 8 for precision.
z	Z Coordinate	int	The z-coordinate of the sound's location, multiplied by 8 for precision.
volume	Volume	float	The volume level of the sound, determining how loud it is.
pitch	Pitch	float	The pitch of the sound, affecting how high or low it sounds.
seed	Sound Seed	long	A seed value used for randomization purposes, ensuring sound variations.

0x6f Initiate Configuration Process

This packet is sent from the server to the client to signal the start of a configuration process. It is a part of the game protocol and is used to initiate specific configuration settings or processes on the client side.

Field	Display Name	Type	Notes
INSTANCE	Singleton Instance	ClientboundStartConfigurationPacket	This is a singleton instance of the packet, ensuring that only one instance is used throughout the application.
STREAM_CODEC	Stream Codec	StreamCodec<ByteBuf ClientboundStartConfigurationPacket>	This codec is used for encoding and decoding the packet data to and from a ByteBuf stream.

0x70 Stop Sound Packet

This packet is used to stop a sound that is currently playing on the client. It can specify either a sound source, a sound name, or both to identify which sound to stop.

Field	Display Name	Type	Notes
name	Sound Name	ResourceLocation	This field holds the ResourceLocation of the sound to be stopped. It is nullable, meaning it can be null if only the source is specified.
source	Sound Source	SoundSource	This field specifies the source of the sound to be stopped, such as a block or entity. It is nullable, meaning it can be null if only the sound name is specified.
b0	Flags Byte	byte	This byte is used to determine which fields are present in the packet. Bit 0 indicates the presence of the source, and bit 1 indicates the presence of the sound name.

0x71 Store Cookie Packet

This packet is used to store a cookie on the client side. It contains a key and a payload, which is a byte array, to be stored.

Field	Display Name	Type	Notes
key	Resource Key	ResourceLocation	This field represents the unique identifier for the cookie being stored. It is read from the buffer using the readResourceLocation method and written using the writeResourceLocation method.
payload	Payload Data	byte[]	This field contains the data to be stored as a cookie. It is a byte array with a maximum size of 5120 bytes. The data is encoded and decoded using the PAYLOAD_STREAM_CODEC.

0x72 System Chat Message Packet

This packet is used to send system chat messages to the client. These messages can be displayed either in the chat window or as an overlay on the screen.

Field	Display Name	Type	Notes
content	Chat Content	Component	The actual message content to be displayed to the player. It is serialized using the ComponentSerialization.TRUSTED_STREAM_CODEC.
overlay	Overlay Flag	boolean	Determines whether the message should be displayed as an overlay (true) or in the chat window (false).

0x73 Tab List Customization Packet

This packet is used to customize the tab list header and footer for the client.

Field	Display Name	Type	Notes
header	Tab List Header	Component	The header component of the tab list, which can include text and formatting.
footer	Tab List Footer	Component	The footer component of the tab list, which can include text and formatting.

0x74 Clientbound Tag Query Packet

This packet is used to send a query from the server to the client regarding a specific tag, identified by a transaction ID. It allows the server to request information about a tag from the client.

Field	Display Name	Type	Notes
transactionId	Transaction ID	VarInt	A unique identifier for the transaction, used to match requests and responses.
tag	Tag Data	CompoundTag	The tag data being queried, which may be null if no tag is associated with the transaction.

0x75 Packet for Item Pickup Notification

This packet is sent from the server to the client to notify that a player has picked up an item entity in the game world. It contains information about the item, the player who picked it up, and the amount of the item taken.

Field	Display Name	Type	Notes
itemId	Item ID	VarInt	The unique identifier for the item entity that is being picked up.
playerId	Player ID	VarInt	The unique identifier for the player who is picking up the item.
amount	Amount	VarInt	The quantity of the item that is being picked up by the player.

0x76 Entity Teleportation Packet

This packet is used to teleport an entity to a new position with specified movement and rotation changes. It also indicates whether the entity is on the ground after teleportation.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity being teleported.
change	Position and Rotation Change	PositionMoveRotation	The new position and rotation for the entity after teleportation.
relatives	Relative Movement Set	Set<Relative>	A set of relative movement flags indicating which components of the position are relative.
onGround	On Ground Status	Bool	A boolean indicating if the entity is on the ground after teleportation.

0x77 Clientbound Ticking State Packet

This packet is used to communicate the current tick rate and frozen state of the game to the client. It informs the client about the server's tick rate and whether the game is currently frozen, allowing the client to adjust its behavior accordingly.

Field	Display Name	Type	Notes
tickRate	Tick Rate	Float	Represents the current tick rate of the server. This value is read from the buffer using readFloat and written using writeFloat.
isFrozen	Is Frozen	Boolean	Indicates whether the game is currently frozen. This value is read from the buffer using readBoolean and written using writeBoolean.

0x78 Clientbound Ticking Step Packet

This packet is used to communicate the number of tick steps that the client should process. It is typically used to synchronize the client's tick rate with the server's tick rate, especially when the server is running at a different speed than the default.

Field	Display Name	Type	Notes
tickSteps	Tick Steps	VarInt	This field represents the number of tick steps that the client should process. It is read from the buffer using the readVarInt method and written using the writeVarInt method.

0x79 Clientbound Transfer Packet

This packet is used to transfer the client to a different server by specifying a new host and port.

Field	Display Name	Type	Notes
host	Host Address	Utf	The host address of the server to which the client is being transferred. It is read and written as a UTF-8 string.
port	Port Number	VarInt	The port number of the server to which the client is being transferred. It is read and written as a VarInt.

0x7a Update Advancements Packet

This packet is used to update the client with the current state of advancements. It can reset the advancements, add new ones, remove existing ones, and update the progress of current advancements.

Field	Display Name	Type	Notes
reset	Reset Flag	Boolean	Indicates whether the advancements should be reset.
added	Added Advancements	List<AdvancementHolder>	A list of advancements that have been added.
removed	Removed Advancements	Set<ResourceLocation>	A set of advancements that have been removed.
progress	Advancement Progress	Map<ResourceLocation AdvancementProgress>	A map containing the progress of each advancement.

0x7b Update Entity Attributes

This packet is sent from the server to the client to update the attributes of a specific entity. Attributes can include things like health, speed, and other entity-specific properties.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	The unique identifier for the entity whose attributes are being updated.
attributes	Attribute Snapshots	List<ClientboundUpdateAttributesPacket.AttributeSnapshot>	A list of attribute snapshots that contain the attribute details for the entity.

0x7c Update Mob Effect Packet

This packet is sent from the server to the client to update the status of a mob effect on an entity. It includes information about the effect type, its amplifier, duration, and various flags indicating how the effect should be displayed.

Field	Display Name	Type	Notes
entityId	Entity ID	VarInt	The unique identifier of the entity that the effect is applied to.
effect	Effect Type	MobEffect	The type of mob effect being applied, represented as a Holder of MobEffect.
effectAmplifier	Effect Amplifier	VarInt	The strength level of the effect, where higher numbers indicate stronger effects.
effectDurationTicks	Effect Duration	VarInt	The duration of the effect in ticks, determining how long the effect will last.
flags	Effect Flags	Byte	A byte representing various flags for the effect: ambient, visible, show icon, and blend.

0x7d Update Recipes Packet

This packet is sent from the server to the client to update the list of available recipes, including item sets and stonecutter recipes.

Field	Display Name	Type	Notes
itemSets	Item Sets	Map<ResourceKey<RecipePropertySet> RecipePropertySet>	A map containing the recipe property sets, identified by their resource keys. This is used to update the client with new or modified recipe properties.
stonecutterRecipes	Stonecutter Recipes	SelectableRecipe.SingleInputSet<StonecutterRecipe>	A set of stonecutter recipes that can be selected by the client. This updates the client with the available stonecutter recipes.

0x7e Update Tags Packet

This packet is sent from the server to the client to update the tags associated with various registries. Tags are used to group similar items or blocks together, allowing for more flexible game mechanics.

Field	Display Name	Type	Notes
tags	Tags Map	Map<ResourceKey<? extends Registry<?>> TagNetworkSerialization.NetworkPayload>	A map containing the tags to be updated, where each entry consists of a registry key and its corresponding network payload.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ClientboundUpdateTagsPacket>	A codec used for encoding and decoding the packet data.

0x7f Projectile Power Update Packet

This packet is sent from the server to the client to update the power of a projectile, such as an arrow or a fireball, in the game. It informs the client about the projectile's unique identifier and its acceleration power, which affects its speed and trajectory.

Field	Display Name	Type	Notes
id	Projectile ID	VarInt	This field represents the unique identifier for the projectile whose power is being updated. It is used to distinguish between different projectiles in the game.
accelerationPower	Acceleration Power	Double	This field indicates the acceleration power of the projectile. It affects how fast the projectile moves and its trajectory in the game world.

0x80 Custom Report Details Packet

This packet is used to send custom report details from the server to the client. It contains a map of key-value pairs where each key and value is a string. This is typically used for sending detailed information about a specific report or event.

Field	Display Name	Type	Notes
details	Details Map	Map<String String>	A map containing the details of the report. Each entry in the map consists of a key and a value, both of which are strings. The maximum number of entries is 32, with each key having a maximum length of 128 characters and each value having a maximum length of 4096 characters.
MAX_DETAIL_KEY_LENGTH	Maximum Detail Key Length	int	The maximum length allowed for each key in the details map. It is set to 128 characters.
MAX_DETAIL_VALUE_LENGTH	Maximum Detail Value Length	int	The maximum length allowed for each value in the details map. It is set to 4096 characters.
MAX_DETAIL_COUNT	Maximum Detail Count	int	The maximum number of key-value pairs allowed in the details map. It is set to 32.
DETAILS_STREAM_CODEC	Details Stream Codec	StreamCodec<ByteBuf Map<String String>>	A codec used for encoding and decoding the details map to and from a ByteBuf. It ensures that the map adheres to the specified constraints on key length, value length, and entry count.
STREAM_CODEC	Packet Stream Codec	StreamCodec<ByteBuf ClientboundCustomReportDetailsPacket>	A composite codec that uses the DETAILS_STREAM_CODEC to encode and decode the entire packet, including the details map.

0x81 Server Links Packet

This packet is used to send a list of untrusted server links from the server to the client. It is part of the clientbound communication, meaning it is sent from the server to the client.

Field	Display Name	Type	Notes
links	Untrusted Server Links	List<ServerLinks.UntrustedEntry>	This field contains a list of untrusted server links that the client should be aware of. Each entry in the list is an instance of ServerLinks.UntrustedEntry, which represents a single untrusted link.

Serverbound (Server → Client)

0x00 Accept Teleportation Request Packet

This packet is sent by the client to the server to confirm that a teleportation request has been accepted. It ensures that the client acknowledges the teleportation event initiated by the server.

Field	Display Name	Type	Notes
id	Teleportation ID	VarInt	This field represents the unique identifier for the teleportation event. It is used to match the teleportation request with the server's record.

0x01 Block Entity Tag Query Request

This packet is sent from the client to the server to request information about a block entity at a specific position. It includes a transaction ID to track the request.

Field	Display Name	Type	Notes
transactionId	Transaction ID	VarInt	A unique identifier for the transaction, used to match the request with the response.
pos	Block Position	BlockPos	The position of the block entity in the world for which the tag information is being requested.

0x02 Select Bundle Item Packet

This packet is sent from the client to the server to indicate the selection of an item within a bundle. It specifies the slot and the index of the selected item.

Field	Display Name	Type	Notes
slotId	Slot ID	VarInt	The ID of the slot where the bundle is located. This identifies which slot in the player's inventory is being interacted with.
selectedItemIndex	Selected Item Index	VarInt	The index of the item within the bundle that has been selected. This specifies which item in the bundle is being chosen by the player.

0x03 Change Difficulty Request Packet

This packet is sent from the client to the server to request a change in the game's difficulty setting.

Field	Display Name	Type	Notes
difficulty	Game Difficulty	Difficulty	Represents the difficulty level the client wants to set. It is an enum value of type Difficulty.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ServerboundChangeDifficultyPacket>	Handles the encoding and decoding of the packet data.
friendlybytebuf.readUnsignedByte()	Read Difficulty ID	UnsignedByte	Reads the difficulty ID from the buffer, which is used to determine the difficulty level.
friendlybytebuf.writeByte(this.difficulty.getId())	Write Difficulty ID	Byte	Writes the difficulty ID to the buffer, representing the desired difficulty level.

0x04 Acknowledgment of Chat Message

This packet is sent from the client to the server to acknowledge the receipt of a chat message. It helps in synchronizing chat messages between the client and server, ensuring that the server knows the client has received a particular message.

Field	Display Name	Type	Notes
offset	Chat Message Offset	VarInt	This field represents the offset or identifier of the chat message that the client is acknowledging. It is used to track which messages have been successfully received by the client.

0x05 Chat Command Packet

This packet is used to send a chat command from the client to the server. It encapsulates a command string that the player wants to execute.

Field	Display Name	Type	Notes
command	Command String	Utf	This field contains the command string that the player has entered. It is read from the buffer using the readUtf method and written using the writeUtf method.

0x06 Signed Chat Command Packet

This packet is used to send a signed chat command from the client to the server. It includes the command, a timestamp, a salt for security, argument signatures, and updates on last seen messages.

Field	Display Name	Type	Notes
command	Command	Utf	The chat command that the player wants to execute. It is sent as a UTF-8 string.
timeStamp	Timestamp	Instant	The exact time when the command was issued, used for ensuring the command's validity and order.
salt	Salt	Long	A random value used to ensure the uniqueness and security of the command signature.
argumentSignatures	Argument Signatures	ArgumentSignatures	Contains the signatures of the command arguments, ensuring they have not been tampered with.
lastSeenMessages	Last Seen Messages Update	LastSeenMessages.Update	Updates the server with the last seen messages to maintain chat consistency and integrity.

0x07 Chat Message Packet

This packet is used to send a chat message from the client to the server. It includes the message content, a timestamp, a salt for security, an optional message signature, and an update of the last seen messages.

Field	Display Name	Type	Notes
message	Chat Message	Utf	The actual text of the chat message being sent. It is read and written using UTF encoding with a maximum length of 256 characters.
timeStamp	Timestamp	Instant	The time at which the message was sent. It is read and written as an Instant object.
salt	Salt	Long	A long value used for security purposes, typically to prevent replay attacks.
signature	Message Signature	Nullable<MessageSignature>	An optional signature of the message, used for verifying the authenticity of the message. It is nullable, meaning it can be absent.
lastSeenMessages	Last Seen Messages Update	LastSeenMessages.Update	An update of the last seen messages, used to synchronize the chat state between client and server.

0x08 Update Chat Session Packet

This packet is used to update the chat session data on the server. It sends the updated chat session information from the client to the server.

Field	Display Name	Type	Notes
chatSession	Chat Session Data	RemoteChatSession.Data	This field contains the data related to the chat session that needs to be updated on the server.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ServerboundChatSessionUpdatePacket>	This codec is used to encode and decode the packet data for transmission over the network.

0x09 Serverbound Chunk Batch Received Packet

This packet is sent from the client to the server to indicate the desired number of chunks the client wants to receive per tick. It helps in managing the flow of chunk data from the server to the client, optimizing performance based on client capabilities.

Field	Display Name	Type	Notes
desiredChunksPerTick	Desired Chunks Per Tick	float	This field represents the number of chunks the client wishes to receive per tick. It is a floating-point number, allowing for precise control over the chunk loading rate.

0x0a Client Command Packet

This packet is sent from the client to the server to perform specific actions such as respawning or requesting statistics.

Field	Display Name	Type	Notes
action	Action	Enum	This field represents the action the client wants to perform. It can be either PERFORM_RESPAWN or REQUEST_STATS.

0x0b Client Tick End Notification

This packet is sent from the client to the server to indicate the end of a client tick. It is used to synchronize the client's state with the server.

Field	Display Name	Type	Notes
INSTANCE	Singleton Instance	ServerboundClientTickEndPacket	A static instance of the packet used for efficient packet handling.
STREAM_CODEC	Stream Codec	StreamCodec<ByteBuf ServerboundClientTickEndPacket>	A codec for encoding and decoding the packet, using a unit codec for the singleton instance.

0x0c Client Information Packet

This packet is used to send client-specific information from the client to the server. It contains details about the client's settings and preferences.

Field	Display Name	Type	Notes
information	Client Information	ClientInformation	This field contains the client's settings and preferences, encapsulated in a ClientInformation object.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ServerboundClientInformationPacket>	This codec is used to encode and decode the packet data to and from the byte buffer.
friendlybytebuf	Byte Buffer	FriendlyByteBuf	This buffer is used to read from and write to the network stream.

0x0d Command Suggestion Request Packet

This packet is sent from the client to the server to request command suggestions. It is typically used when a player is typing a command and needs auto-completion suggestions.

Field	Display Name	Type	Notes
id	Request ID	VarInt	A unique identifier for the command suggestion request. This ID is used to match the request with the corresponding response from the server.
command	Command Input	Utf	The current command input from the player. This string is sent to the server to generate relevant command suggestions. The maximum length is 32,500 characters.

0x0e Acknowledgement of Configuration

This packet is sent from the client to the server to acknowledge that the client has received and accepted the server's configuration settings.

Field	Display Name	Type	Notes
INSTANCE	Singleton Instance	ServerboundConfigurationAcknowledgedPacket	A singleton instance of the packet, used to avoid creating multiple instances.
STREAM_CODEC	Stream Codec	StreamCodec<ByteBuf ServerboundConfigurationAcknowledgedPacket>	A codec for encoding and decoding the packet, using a unit codec for the singleton instance.

0x0f Container Button Click Packet

This packet is sent from the client to the server when a player clicks a button in a container GUI. It informs the server about the specific container and button that was interacted with.

Field	Display Name	Type	Notes
containerId	Container Identifier	CONTAINER_ID	This field represents the unique identifier for the container that the player is interacting with. It helps the server identify which container's button was clicked.
buttonId	Button Identifier	VarInt	This field represents the identifier for the specific button that was clicked within the container. It allows the server to determine the action to be taken based on the button interaction.

0x10 Container Click Packet

This packet is sent from the client to the server to indicate that a player has clicked on a slot in a container (e.g., a chest or inventory). It includes details about the click action, such as the slot number, button pressed, and the type of click.

Field	Display Name	Type	Notes
containerId	Container ID	ContainerId	The unique identifier for the container being interacted with.
stateId	State ID	VarInt	The current state ID of the container, used for synchronization.
slotNum	Slot Number	Short	The slot number in the container that was clicked.
buttonNum	Button Number	Byte	The mouse button number used for the click action.
clickType	Click Type	Enum<ClickType>	The type of click action performed (e.g., left click, right click).
carriedItem	Carried Item	ItemStack	The item stack currently being carried by the player.
changedSlots	Changed Slots	Int2ObjectMap<ItemStack>	A map of slot numbers to item stacks representing the slots that have changed as a result of the click.

0x11 Close Container Packet

This packet is sent from the client to the server to indicate that a container (such as a chest or crafting table) has been closed by the player.

Field	Display Name	Type	Notes
containerId	Container ID	int	This field represents the unique identifier for the container that is being closed. It is used by the server to identify which container the player is interacting with.

0x12 Container Slot State Change Notification

This packet is sent from the client to the server to notify about a change in the state of a specific slot within a container. It indicates which slot has changed, the container it belongs to, and the new state of the slot.

Field	Display Name	Type	Notes
slotId	Slot Identifier	VarInt	The unique identifier for the slot within the container that has changed.
containerId	Container Identifier	ContainerId	The unique identifier for the container that contains the slot.
newState	New State	Boolean	The new state of the slot, indicating whether it is active or inactive.

0x13 Serverbound Cookie Response Packet

This packet is used to send a response from the client to the server regarding a cookie operation. It includes a key identifying the cookie and an optional payload containing the cookie data.

Field	Display Name	Type	Notes
key	Cookie Key	ResourceLocation	This field represents the unique identifier for the cookie. It is read from the buffer using the readResourceLocation method and written using the writeResourceLocation method.
payload	Cookie Payload	byte[]	This is an optional field that contains the data associated with the cookie. It is read and written using the readNullable and writeNullable methods, respectively, with the ClientboundStoreCookiePacket.PAYLOAD_STREAM_CODEC as the codec.

0x14 Serverbound Custom Payload Packet

This packet is used to send custom payload data from the client to the server. It allows for the transmission of custom data types defined by the server and client.

Field	Display Name	Type	Notes
payload	Payload	CustomPacketPayload	The main data being transmitted in this packet. It is a custom payload defined by the server and client.
MAX_PAYLOAD_SIZE	Maximum Payload Size	int	The maximum size of the payload that can be sent in this packet. It is set to 32767 bytes.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ServerboundCustomPayloadPacket>	A codec used to encode and decode the payload data for transmission. It supports different types of custom payloads, including the BrandPayload.

0x15 Debug Sample Subscription Packet

This packet is used to subscribe to a specific type of debug sample on the server. It allows the client to request data related to a particular debug sample type, which the server will then provide.

Field	Display Name	Type	Notes
sampleType	Sample Type	RemoteDebugSampleType	This field specifies the type of debug sample the client is subscribing to. It is an enumeration of possible debug sample types.

0x16 Edit Book Packet

This packet is sent from the client to the server to edit a book in the player's inventory. It includes the slot of the book, the pages to be written, and an optional title.

Field	Display Name	Type	Notes
slot	Book Slot	VarInt	The inventory slot where the book is located. This is an integer value that identifies the position of the book in the player's inventory.
pages	Book Pages	List<String>	A list of strings representing the content of each page in the book. The list can contain up to 100 pages, each with a maximum length of 1024 characters.
title	Book Title	Optional<String>	An optional string representing the title of the book. The title can be up to 32 characters long. If no title is provided, the book remains untitled.

0x17 Entity Tag Query Request

This packet is sent from the client to the server to request information about a specific entity's tags. It includes a transaction ID for tracking the request and the entity ID for which the tag information is being requested.

Field	Display Name	Type	Notes
transactionId	Transaction ID	VarInt	A unique identifier for the transaction, used to match the request with the response.
entityId	Entity ID	VarInt	The ID of the entity for which the tag information is being requested.

0x18 Serverbound Interact Packet

This packet is used to handle interactions between the player and entities in the game world. It can represent different types of interactions such as attacking an entity, interacting with an entity using a hand, or interacting at a specific location on the entity.

Field	Display Name	Type	Notes
entityId	Entity Identifier	VarInt	The unique identifier for the entity that the player is interacting with.
action	Interaction Action	ServerboundInteractPacket.Action	The specific action being performed, such as attack or interact.
usingSecondaryAction	Using Secondary Action	Boolean	Indicates whether the secondary action (e.g., off-hand interaction) is being used.

0x19 Jigsaw Structure Generation Request

This packet is sent from the client to the server to request the generation of a jigsaw structure at a specified location. It includes details about the position, the number of levels to generate, and whether to keep existing jigsaws.

Field	Display Name	Type	Notes
pos	Position	BlockPos	The position in the world where the jigsaw structure generation should start.
levels	Number of Levels	VarInt	The number of levels to generate for the jigsaw structure.
keepJigsaws	Keep Existing Jigsaws	Boolean	A flag indicating whether existing jigsaws should be retained during the generation process.

0x1a Serverbound Keep Alive Packet

This packet is used by the client to confirm to the server that it is still connected and responsive. It helps in maintaining the connection alive by sending a keep-alive signal.

Field	Display Name	Type	Notes
id	Keep Alive ID	long	A unique identifier for the keep-alive packet. This ID is used to match the keep-alive request with the response.

0x1b Lock Difficulty Packet

This packet is used to lock or unlock the difficulty setting on the server. It is sent from the client to the server to indicate whether the difficulty should be locked.

Field	Display Name	Type	Notes
locked	Locked Flag	Boolean	Indicates whether the difficulty is locked (true) or unlocked (false). This is the main data being transmitted in this packet.

0x1c Player Movement Packet

This packet is used to communicate player movement data from the client to the server. It includes information about the player's position, rotation, and status flags such as whether the player is on the ground or has collided horizontally.

Field	Display Name	Type	Notes
x	X Coordinate	double	The X coordinate of the player's position.
y	Y Coordinate	double	The Y coordinate of the player's position.
z	Z Coordinate	double	The Z coordinate of the player's position.
yRot	Yaw Rotation	float	The yaw rotation of the player.
xRot	Pitch Rotation	float	The pitch rotation of the player.
onGround	On Ground Flag	boolean	Indicates if the player is on the ground.
horizontalCollision	Horizontal Collision Flag	boolean	Indicates if the player has collided horizontally.
hasPos	Has Position Flag	boolean	Indicates if the packet contains position data.
hasRot	Has Rotation Flag	boolean	Indicates if the packet contains rotation data.
packFlags	Pack Flags Method	int	Combines onGround and horizontalCollision flags into a single integer.
unpackOnGround	Unpack On Ground Method	boolean	Extracts the onGround flag from the packed flags integer.
unpackHorizontalCollision	Unpack Horizontal Collision Method	boolean	Extracts the horizontalCollision flag from the packed flags integer.
StatusOnly.read	Read StatusOnly Packet	ServerboundMovePlayerPacket.StatusOnly	Reads the StatusOnly packet data from the buffer.
StatusOnly.write	Write StatusOnly Packet	void	Writes the StatusOnly packet data to the buffer.
Rot.read	Read Rot Packet	ServerboundMovePlayerPacket.Rot	Reads the Rot packet data from the buffer.
Rot.write	Write Rot Packet	void	Writes the Rot packet data to the buffer.
Pos.read	Read Pos Packet	ServerboundMovePlayerPacket.Pos	Reads the Pos packet data from the buffer.
Pos.write	Write Pos Packet	void	Writes the Pos packet data to the buffer.
PosRot.read	Read PosRot Packet	ServerboundMovePlayerPacket.PosRot	Reads the PosRot packet data from the buffer.
PosRot.write	Write PosRot Packet	void	Writes the PosRot packet data to the buffer.

0x1d Player Movement Packet

This packet is used to communicate player movement data from the client to the server. It includes information about the player's position, rotation, and status flags such as whether the player is on the ground or has collided horizontally.

Field	Display Name	Type	Notes
x	X Coordinate	double	The X coordinate of the player's position.
y	Y Coordinate	double	The Y coordinate of the player's position.
z	Z Coordinate	double	The Z coordinate of the player's position.
yRot	Yaw Rotation	float	The yaw rotation of the player.
xRot	Pitch Rotation	float	The pitch rotation of the player.
onGround	On Ground Flag	boolean	Indicates if the player is on the ground.
horizontalCollision	Horizontal Collision Flag	boolean	Indicates if the player has collided horizontally.
hasPos	Has Position Flag	boolean	Indicates if the packet contains position data.
hasRot	Has Rotation Flag	boolean	Indicates if the packet contains rotation data.

0x1e Player Movement Packet

This packet is used to communicate player movement data from the client to the server. It includes information about the player's position, rotation, and status flags such as whether the player is on the ground or has collided horizontally.

Field	Display Name	Type	Notes
x	X Coordinate	double	The X coordinate of the player's position.
y	Y Coordinate	double	The Y coordinate of the player's position.
z	Z Coordinate	double	The Z coordinate of the player's position.
yRot	Yaw Rotation	float	The yaw rotation of the player.
xRot	Pitch Rotation	float	The pitch rotation of the player.
onGround	On Ground Flag	boolean	Indicates if the player is on the ground.
horizontalCollision	Horizontal Collision Flag	boolean	Indicates if the player has collided horizontally.
hasPos	Has Position Flag	boolean	Indicates if the packet contains position data.
hasRot	Has Rotation Flag	boolean	Indicates if the packet contains rotation data.
packFlags	Pack Flags Method	int	Combines onGround and horizontalCollision flags into a single integer.
unpackOnGround	Unpack On Ground Method	boolean	Extracts the onGround flag from the packed flags.
unpackHorizontalCollision	Unpack Horizontal Collision Method	boolean	Extracts the horizontalCollision flag from the packed flags.

0x1f Player Movement Packet

This packet is used to communicate player movement data from the client to the server. It includes information about the player's position, rotation, and status flags such as whether the player is on the ground or has collided horizontally.

Field	Display Name	Type	Notes
x	X Coordinate	double	The X coordinate of the player's position.
y	Y Coordinate	double	The Y coordinate of the player's position.
z	Z Coordinate	double	The Z coordinate of the player's position.
yRot	Yaw Rotation	float	The yaw rotation of the player, representing the horizontal rotation.
xRot	Pitch Rotation	float	The pitch rotation of the player, representing the vertical rotation.
onGround	On Ground Flag	boolean	Indicates whether the player is on the ground.
horizontalCollision	Horizontal Collision Flag	boolean	Indicates whether the player has collided horizontally.
hasPos	Has Position Flag	boolean	Indicates whether the packet contains position data.
hasRot	Has Rotation Flag	boolean	Indicates whether the packet contains rotation data.

0x20 Vehicle Movement Packet

This packet is sent from the client to the server to update the position and rotation of a vehicle entity that the player is controlling. It informs the server about the vehicle's new position, rotation, and whether it is on the ground.

Field	Display Name	Type	Notes
position	Vehicle Position	Vec3	Represents the 3D coordinates (x, y, z) of the vehicle's position in the game world.
yRot	Yaw Rotation	Float	The rotation around the vertical axis (yaw) of the vehicle.
xRot	Pitch Rotation	Float	The rotation around the horizontal axis (pitch) of the vehicle.
onGround	On Ground Status	Bool	Indicates whether the vehicle is currently on the ground or in the air.

0x21 Paddle Boat Control Packet

This packet is used to communicate the player's paddle actions in a boat to the server. It indicates whether the left or right paddle is being used, allowing the server to update the boat's movement accordingly.

Field	Display Name	Type	Notes
left	Left Paddle Active	Boolean	Indicates if the left paddle is being used. True if active, false otherwise.
right	Right Paddle Active	Boolean	Indicates if the right paddle is being used. True if active, false otherwise.

0x22 Packet for Picking Item from Block

This packet is sent from the client to the server to request picking an item from a specific block position in the game world. It includes information about whether additional data should be included in the request.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	The position of the block from which the item is to be picked. This is represented by the BlockPos class, which encodes the x, y, and z coordinates of the block in the game world.
includeData	Include Additional Data	boolean	A boolean flag indicating whether additional data should be included in the request. This could be used to specify if metadata or other block-specific information is needed.

0x23 Serverbound Pick Item From Entity Packet

This packet is sent from the client to the server to request picking an item from an entity. It includes the entity's ID and whether additional data should be included.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity from which the item is to be picked.
includeData	Include Additional Data	Bool	A boolean flag indicating whether additional data should be included in the request.

0x24 Ping Request Packet

This packet is sent from the client to the server to measure the latency or 'ping' between the two. It contains a timestamp that the server will use to calculate the round-trip time.

Field	Display Name	Type	Notes
time	Timestamp	long	This field holds the timestamp when the packet was created. It is used to calculate the latency by comparing it with the server's current time when the packet is received.

0x25 Serverbound Place Recipe Packet

This packet is sent from the client to the server to indicate that a player wants to place a recipe in a crafting container. It includes the container ID, the recipe to be placed, and whether to use the maximum number of items available.

Field	Display Name	Type	Notes
containerId	Container ID	VarInt	The ID of the container where the recipe is to be placed. This helps the server identify which crafting interface the player is interacting with.
recipe	Recipe Display ID	RecipeDisplayId	The unique identifier for the recipe that the player wants to place. This ID is used to fetch the recipe details from the server's recipe registry.
useMaxItems	Use Max Items	Boolean	A flag indicating whether the player wants to use the maximum number of items available for crafting the recipe. If true, the server will attempt to use as many items as possible.

0x26 Player Abilities Update Packet

This packet is sent from the client to the server to update the player's abilities, specifically whether the player is flying or not.

Field	Display Name	Type	Notes
isFlying	Is Flying	boolean	Indicates whether the player is currently flying. This is determined by checking if the second bit of the byte is set.
FLAG_FLYING	Flying Flag	int	A constant representing the bit flag for flying, used to check or set the flying state in the byte.
STREAM_CODEC	Stream Codec	StreamCodec<FriendlyByteBuf ServerboundPlayerAbilitiesPacket>	Defines the codec for encoding and decoding the packet data.

0x27 Player Action Packet

This packet is sent from the client to the server to indicate a player's action, such as starting or stopping block destruction, dropping items, or swapping items with the offhand.

Field	Display Name	Type	Notes
action	Player Action	Enum	Represents the type of action the player is performing, such as START_DESTROY_BLOCK or DROP_ITEM.
pos	Block Position	BlockPos	The position of the block that the action is being performed on.
direction	Block Face Direction	Direction	The face of the block that the action is targeting, represented as a direction.
sequence	Action Sequence Number	VarInt	A sequence number to ensure actions are processed in the correct order.

0x28 Player Command Packet

This packet is used to send player command actions from the client to the server. It includes actions like starting or stopping sprinting, pressing or releasing the shift key, and other player-related commands.

Field	Display Name	Type	Notes
id	Entity ID	VarInt	The unique identifier for the entity that the command is associated with.
action	Player Action	Enum	The specific action the player is performing, such as starting to sprint or opening the inventory.
data	Additional Data	VarInt	Additional data related to the action, often used for actions that require extra information.

0x29 Player Input Packet

This packet is sent from the client to the server to convey the player's input actions, such as movement or interaction commands.

Field	Display Name	Type	Notes
input	Player Input	Input	This field contains the player's input data, encapsulated in the Input class, which includes movement and interaction commands.

0x2a Player Loaded Notification Packet

This packet is sent from the client to the server to notify that the player has successfully loaded into the game world.

Field	Display Name	Type	Notes
STREAM_CODEC	Stream Codec	StreamCodec<ByteBuf ServerboundPlayerLoadedPacket>	This field defines the codec used for encoding and decoding the packet data. It uses a unit codec for this packet, indicating no additional data is transmitted.
type	Packet Type	PacketType<ServerboundPlayerLoadedPacket>	This method returns the specific type of the packet, which is used to identify it within the protocol.
handle	Packet Handler	ServerGamePacketListener	This method is called to handle the packet once it is received by the server. It triggers the server's logic to process the player load notification.

0x2b Server Pong Packet

This packet is sent from the client to the server as a response to a ping request, typically used to measure latency or ensure the connection is still active.

Field	Display Name	Type	Notes
id	Packet Identifier	int	This field holds the unique identifier for the pong packet, which corresponds to the ping packet's ID.

0x2c Packet for changing recipe book settings

This packet is sent from the client to the server to update the settings of the recipe book, such as whether it is open and if it is filtering recipes.

Field	Display Name	Type	Notes
bookType	Type of Recipe Book	Enum<RecipeBookType>	Indicates the type of recipe book being modified, such as crafting or smelting.
isOpen	Recipe Book Open Status	Boolean	Determines if the recipe book is currently open.
isFiltering	Recipe Book Filtering Status	Boolean	Indicates whether the recipe book is filtering recipes based on available ingredients.

0x2d Notify server of a recipe being viewed

This packet is sent from the client to the server to notify that a specific recipe has been viewed by the player in the recipe book.

Field	Display Name	Type	Notes
recipe	Recipe Display ID	RecipeDisplayId	This field contains the unique identifier for the recipe that has been viewed. It is used to inform the server which recipe the player has seen.

0x2e Rename Item Packet

This packet is sent from the client to the server to rename an item in the player's inventory.

Field	Display Name	Type	Notes
name	Item Name	Utf	The new name for the item, encoded as a UTF-8 string.

0x2f Resource Pack Response Packet

This packet is sent from the client to the server to communicate the client's response to a resource pack request. It includes the unique identifier of the resource pack and the action taken by the client, such as accepting or declining the resource pack.

Field	Display Name	Type	Notes
id	Resource Pack ID	UUID	A unique identifier for the resource pack, used to track which resource pack the client is responding to.
action	Client Action	Enum	The action taken by the client regarding the resource pack. This can be one of several states, such as ACCEPTED, DECLINED, or FAILED_DOWNLOAD.

0x30 Advancement Tab Interaction Packet

This packet is used to communicate the player's interaction with the advancements tab, either by opening a specific tab or closing the advancements screen.

Field	Display Name	Type	Notes
action	Action Type	Enum	Indicates the type of action performed by the player. It can be either OPENED_TAB or CLOSED_SCREEN.
tab	Advancement Tab	ResourceLocation	Specifies the advancement tab that was opened. This field is only relevant if the action is OPENED_TAB.

0x31 Select Trade Packet

This packet is sent from the client to the server to select a trade option when interacting with a villager or a similar trading entity.

Field	Display Name	Type	Notes
item	Selected Trade Index	VarInt	This field represents the index of the trade option that the player has selected. It is sent as a VarInt to efficiently encode the integer value.

0x32 Set Beacon Effects Packet

This packet is sent from the client to the server to set the primary and secondary effects of a beacon.

Field	Display Name	Type	Notes
primary	Primary Effect	Optional<Holder<MobEffect>>	Represents the primary effect chosen for the beacon. It is optional, meaning the player may choose not to set a primary effect.
secondary	Secondary Effect	Optional<Holder<MobEffect>>	Represents the secondary effect chosen for the beacon. It is optional, meaning the player may choose not to set a secondary effect.

0x33 Set Carried Item Packet

This packet is sent from the client to the server to update the currently selected hotbar slot. It informs the server which item slot the player has selected in their inventory.

Field	Display Name	Type	Notes
slot	Selected Slot	Short	This field represents the index of the hotbar slot that the player has selected. It is a short integer value.

0x34 Set Command Block Packet

This packet is used to update the properties of a command block in the game. It allows the client to send information about the command block's position, command, mode, and various flags to the server.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	The position of the command block in the world.
command	Command String	String	The command to be executed by the command block.
mode	Command Block Mode	CommandBlockEntity.Mode	The mode of the command block, which can be one of several predefined modes.
trackOutput	Track Output Flag	boolean	Indicates whether the command block should track its output.
conditional	Conditional Flag	boolean	Indicates whether the command block is conditional.
automatic	Automatic Flag	boolean	Indicates whether the command block should execute automatically.

0x35 Set Command for Minecart Packet

This packet is used to set a command in a command block minecart. It includes the entity ID of the minecart, the command to be executed, and whether the output of the command should be tracked.

Field	Display Name	Type	Notes
entity	Entity ID	VarInt	The unique identifier for the minecart entity that contains the command block.
command	Command String	Utf	The command to be executed by the command block in the minecart.
trackOutput	Track Output Flag	Boolean	A boolean flag indicating whether the output of the command should be tracked and displayed.

0x36 Set Creative Mode Slot Packet

This packet is sent from the client to the server to update the item in a specific slot while in creative mode. It allows the player to set or change the item in a particular inventory slot.

Field	Display Name	Type	Notes
slotNum	Slot Number	short	The slot number in the player's inventory that is being updated. It is a short value representing the index of the slot.
itemStack	Item Stack	net.minecraft.world.item.ItemStack	The item stack to be placed in the specified slot. It contains information about the item type, quantity, and any additional data like enchantments or custom names.

0x37 Set Jigsaw Block Packet

This packet is used to set the properties of a jigsaw block in the game. It is sent from the client to the server to update the jigsaw block's configuration, including its position, name, target, pool, final state, joint type, and priorities.

Field	Display Name	Type	Notes
pos	Block Position	BlockPos	The position of the jigsaw block in the world.
name	Name Resource Location	ResourceLocation	The name of the jigsaw block, represented as a resource location.
target	Target Resource Location	ResourceLocation	The target structure or block that the jigsaw block is pointing to, represented as a resource location.
pool	Pool Resource Location	ResourceLocation	The pool of structures or blocks that the jigsaw block can choose from, represented as a resource location.
finalState	Final State	String	The final state of the jigsaw block, typically a string representation of block states.
joint	Joint Type	JigsawBlockEntity.JointType	The type of joint used by the jigsaw block, determining how it connects to other blocks.
selectionPriority	Selection Priority	VarInt	The priority for selecting this jigsaw block during structure generation.
placementPriority	Placement Priority	VarInt	The priority for placing this jigsaw block during structure generation.

0x38 Set Structure Block Packet

This packet is used to update the properties of a structure block in the game. It allows the server to receive information about the structure block's position, mode, and other settings from the client.

Field	Display Name	Type	Notes
pos	Position	BlockPos	The position of the structure block in the world.
updateType	Update Type	StructureBlockEntity.UpdateType	The type of update to perform on the structure block.
mode	Mode	StructureMode	The mode of the structure block, such as SAVE, LOAD, CORNER, or DATA.
name	Structure Name	String	The name of the structure associated with the block.
offset	Offset	BlockPos	The offset of the structure from the block's position.
size	Size	Vec3i	The size of the structure.
mirror	Mirror	Mirror	The mirror setting of the structure block.
rotation	Rotation	Rotation	The rotation setting of the structure block.
data	Data	String	Additional data associated with the structure block.
ignoreEntities	Ignore Entities	boolean	Whether entities should be ignored when the structure is loaded.
showAir	Show Air	boolean	Whether air blocks should be shown when the structure is loaded.
showBoundingBox	Show Bounding Box	boolean	Whether the bounding box of the structure should be shown.
integrity	Integrity	float	The integrity of the structure, affecting how complete it is when loaded.
seed	Seed	long	The seed used for randomization when loading the structure.

0x39 Sign Update Packet

This packet is sent from the client to the server to update the text on a sign block in the game world. It includes the position of the sign, the text to be displayed, and whether the text is on the front side of the sign.

Field	Display Name	Type	Notes
pos	Sign Position	BlockPos	The position of the sign block in the game world. This is used to identify which sign is being updated.
isFrontText	Is Front Text	Boolean	A boolean flag indicating whether the text being updated is on the front side of the sign.
lines	Sign Text Lines	String[4]	An array of strings representing the four lines of text on the sign. Each line can have a maximum length of 384 characters.

0x3a Player Swing Action Packet

This packet is sent from the client to the server to indicate that the player has performed a swing action, typically with a hand-held item.

Field	Display Name	Type	Notes
hand	Interaction Hand	Enum<InteractionHand>	Specifies which hand (main or offhand) the player used to perform the swing action.

0x3b Teleport to Entity Request Packet

This packet is sent from the client to the server to request a teleportation to a specific entity identified by its UUID.

Field	Display Name	Type	Notes
uuid	Entity UUID	UUID	The unique identifier of the entity to which the player wants to teleport.

0x3c Serverbound Use Item On Packet

This packet is sent from the client to the server when a player uses an item on a block. It contains information about the hand used, the block hit, and a sequence number for tracking.

Field	Display Name	Type	Notes
hand	Interaction Hand	Enum<InteractionHand>	Indicates which hand (main or offhand) the player used to interact with the block.
blockHit	Block Hit Result	BlockHitResult	Contains details about the block that was interacted with, including the position and face of the block.
sequence	Sequence Number	VarInt	A sequence number used to track the order of interactions, ensuring they are processed in the correct order.

0x3d Packet for Using an Item

This packet is sent from the client to the server when a player uses an item. It contains information about which hand is used, the sequence number of the action, and the player's rotation angles.

Field	Display Name	Type	Notes
hand	Hand Used	Enum<InteractionHand>	Indicates which hand (main or offhand) the player is using to perform the action.
sequence	Action Sequence Number	VarInt	A unique identifier for the action sequence, used to ensure actions are processed in the correct order.
yRot	Player's Y Rotation	Float	The player's rotation around the Y-axis, representing the horizontal direction they are facing.
xRot	Player's X Rotation	Float	The player's rotation around the X-axis, representing the vertical direction they are looking.