Packets you can send

65 client-to-server records; each is a Java record you build with its canonical constructor and hand to packets.send or packets.sendSequenced — see Packets. 14 of them are observe-only: send returns false and warns once in the script console. A send also fails on a null field, an enum constant with no vanilla twin, an entity outside the loaded world or a slot out of range; the enum types are listed in Packet enums.

name("Instant respawn")
key(Key.R)

onEnable {
    // the death screen's Respawn button, as a packet
    packets.send(C2SClientStatusPacket(ClientStatus.PERFORM_RESPAWN))
}

#C2SAcknowledgeChunksPacket

Chunk-batch rate the client asks for after finishing a batch.

#C2SAcknowledgeReconfigurationPacket

Acknowledges the server's switch to the configuration phase; no components.

#C2SAdvancementTabPacket

Advancement screen tab opened or closed. Observe-only.

#C2SBoatPaddleStatePacket

Paddle animation state while riding a boat.

#C2SBookUpdatePacket

Writable-book edit or signing. Observe-only.

#C2SBundleItemSelectedPacket

Selects the active item inside a bundle.

#C2SButtonClickPacket

Button pressed inside a screen handler: enchanting table, trade, loom, stonecutter.

#C2SChangeGameModePacket

Client asks to change its own game mode.

#C2SChatCommandSignedPacket

Signed command execution. Observe-only; signatures and acknowledgments are not exposed.

#C2SChatMessagePacket

Plain chat message from the player. Observe-only; signature data is not exposed.

#C2SClickSlotPacket

Inventory slot click. Observe-only; the changed-stack map and the cursor stack are not exposed.

#C2SClientCommandPacket

Player state command: leave bed, sprint, horse jump, ride inventory, elytra.

#C2SClientOptionsPacket

Full client settings block, sent on join and on every option change.

#C2SClientStatusPacket

Respawn request or statistics request.

#C2SClientTickEndPacket

Marks the end of a client tick; no components.

#C2SCloseHandledScreenPacket

Client closed a screen handler.

#C2SCommandExecutionPacket

Unsigned command execution.

#C2SCommonPongPacket

Reply to S2CCommonPingPacket.

#C2SCookieResponsePacket

Cookie value returned to the server. Observe-only; the payload bytes are not exposed.

#C2SCraftRequestPacket

Recipe-book craft request.

#C2SCreativeInventoryActionPacket

Creative-mode slot set. Observe-only; item components and NBT are not exposed.

#C2SCustomClickActionPacket

Custom click action from a server dialog. Observe-only; the payload NBT is not exposed.

#C2SCustomPayloadPacket

Plugin-channel message. Observe-only; the payload bytes are not exposed.

#C2SDebugSubscriptionRequestPacket

Debug-sample subscription request. Observe-only; no components.

#C2SHandSwingPacket

Arm swing animation.

#C2SJigsawGeneratingPacket

Generate pressed on a jigsaw block.

#C2SKeepAlivePacket

Keep-alive reply.

#C2SMessageAcknowledgmentPacket

Acknowledges received chat messages.

#C2SMoveFullPacket

Movement packet carrying position and rotation.

#C2SMoveLookPacket

Movement packet carrying rotation only.

#C2SMoveOnGroundPacket

Movement packet carrying flags only, sent on an idle tick.

#C2SMovePositionPacket

Movement packet carrying position only.

#C2SPickItemFromBlockPacket

Middle-click pick block.

#C2SPickItemFromEntityPacket

Middle-click pick entity.

#C2SPlayerActionPacket

Block-break stage, item drop, hand swap or use-release.

#C2SPlayerInputPacket

Raw movement key state, one flag per input.

#C2SPlayerInteractBlockPacket

Right-click on a block.

#C2SPlayerInteractEntityPacket

Attack, interact or interact-at against an entity.

#C2SPlayerInteractItemPacket

Right-click with the held item, not aimed at a block.

#C2SPlayerLoadedPacket

Client finished loading into the world; no components.

#C2SPlayerSessionPacket

Chat session and public-key announcement. Observe-only; no components.

#C2SQueryBlockNbtPacket

Operator block-NBT query, answered by S2CNbtQueryResponsePacket.

#C2SQueryEntityNbtPacket

Operator entity-NBT query, answered by S2CNbtQueryResponsePacket.

#C2SRecipeBookDataPacket

Recipe clicked in the recipe book.

#C2SRecipeCategoryOptionsPacket

Per-category recipe-book UI state.

#C2SRenameItemPacket

Anvil rename field text.

#C2SRequestCommandCompletionsPacket

Tab-completion request, answered by S2CCommandSuggestionsPacket.

#C2SResourcePackStatusPacket

Resource-pack download and apply status. Observe-only.

#C2SSelectMerchantTradePacket

Villager trade selection.

#C2SSelectSlotPacket

Hotbar slot selection.

#C2SSetTestBlockPacket

Test block configuration write.

#C2SSlotChangedStatePacket

Crafter slot enabled or disabled.

#C2SSpectatorTeleportPacket

Spectator teleport to a player by uuid.

#C2STeleportConfirmPacket

Confirms a teleport id from S2CPlayerPositionLookPacket.

#C2STestInstanceBlockActionPacket

Button pressed on a test instance block. Observe-only.

#C2SUpdateBeaconPacket

Beacon effect selection.

An unknown or unparseable id is sent as "none" instead of failing the send.

#C2SUpdateCommandBlockMinecartPacket

Command-block minecart edit.

#C2SUpdateCommandBlockPacket

Command block edit.

#C2SUpdateDifficultyLockPacket

Difficulty lock toggle; single-player or LAN host only.

#C2SUpdateDifficultyPacket

Difficulty change; single-player or LAN host only.

#C2SUpdateJigsawPacket

Jigsaw block edit. Observe-only.

#C2SUpdatePlayerAbilitiesPacket

Flight toggle.

send builds a fresh abilities object with only flying set; the other ability flags are not carried.

#C2SUpdateSignPacket

Sign text write.

#C2SUpdateStructureBlockPacket

Structure block edit.

#C2SVehicleMovePacket

Position and rotation of the vehicle the player drives.