2026.01.24 6e2d4fc36 interaction

Interaction Packets

Version: 2026.01.24-6e2d4fc36

This category contains 6 packet(s).

Packet Index

ID	Name	Package	Compressed	Max Size
-	SyncInteractionChain	com.hypixel.hytale.protocol.packets.interaction	No	1600 MB
0x122	SyncInteractionChains	com.hypixel.hytale.protocol.packets.interaction	No	1600 MB
0x123	CancelInteractionChain	com.hypixel.hytale.protocol.packets.interaction	No	1.0 KB
0x124	PlayInteractionFor	com.hypixel.hytale.protocol.packets.interaction	No	15.6 MB
0x125	MountNPC	com.hypixel.hytale.protocol.packets.interaction	No	16 bytes
0x126	DismountNPC	com.hypixel.hytale.protocol.packets.interaction	No	-

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SyncInteractionChain

Property	Value
Compressed	No
Fixed Block Size	33 bytes
Variable Field Count	7
Max Size	1600 MB
Nullable Bit Field	1 byte(s)
Variable Block Start	61

Fields

Name	Type	Offset	Size	Encoding	Nullable
activeHotbarSlot	int	1	4	int32_le	No
activeUtilitySlot	int	5	4	int32_le	No
activeToolsSlot	int	9	4	int32_le	No
itemInHandId	String	-1	var	var_string:utf8	Yes
utilityItemId	String	-1	var	var_string:utf8	Yes
toolsItemId	String	-1	var	var_string:utf8	Yes
initial	boolean	13	1	byte	No
desync	boolean	14	1	byte	No
overrideRootInteraction	int	15	4	int32_le	No
interactionType	InteractionType	19	1	byte	No
equipSlot	int	20	4	int32_le	No
chainId	int	24	4	int32_le	No
forkedId	ForkedChainId	-1	var	nested:ForkedChainId	Yes
data	InteractionChainData	-1	var	nested:InteractionChainData	Yes
state	InteractionState	28	1	byte	No
newForks	SyncInteractionChain[]	-1	var	array:nested:SyncInteractionChain	Yes
operationBaseIndex	int	29	4	int32_le	No
interactionData	InteractionSyncData[]	-1	var	array:nested:InteractionSyncData	Yes

Layout Notes: Fixed block contains nullable bits at offset 0, fixed fields at offsets 1-29, variable data offsets stored at specific positions, variable data starts at offset 61

interactionType enum values:

• 0 = Primary
• 1 = Secondary
• 2 = Ability1
• 3 = Ability2
• 4 = Ability3
• 5 = Use
• 6 = Pick
• 7 = Pickup
• 8 = CollisionEnter
• 9 = CollisionLeave
• 10 = Collision
• 11 = EntityStatEffect
• 12 = SwapTo
• 13 = SwapFrom
• 14 = Death
• 15 = Wielding
• 16 = ProjectileSpawn
• 17 = ProjectileHit
• 18 = ProjectileMiss
• 19 = ProjectileBounce
• 20 = Held
• 21 = HeldOffhand
• 22 = Equipped
• 23 = Dodge
• 24 = GameModeSwap

state enum values:

• 0 = Finished
• 1 = Skip
• 2 = ItemChanged
• 3 = Failed
• 4 = NotFinished

---

SyncInteractionChains

Property	Value
Packet ID	0x122 (290)
Compressed	No
Variable Field Count	1
Max Size	1600 MB

Fields

Name	Type	Offset	Size	Encoding	Nullable
updates	SyncInteractionChain[]	-1	var	nested:SyncInteractionChain	No

Layout Notes: Packet contains a variable-length array 'updates' with count as VarInt at the start; no nullable bits.

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CancelInteractionChain

Property	Value
Packet ID	0x123 (291)
Compressed	No
Fixed Block Size	5 bytes
Variable Field Count	1
Max Size	1.0 KB
Nullable Bit Field	1 byte(s)
Variable Block Start	5

Fields

Name	Type	Offset	Size	Encoding	Nullable
chainId	int	1	4	int32_le	No
forkedId	ForkedChainId	-1	var	nested:ForkedChainId	Yes

Layout Notes: Fixed block contains nullBits at offset 0, chainId at offset 1-4; forkedId is in variable section if present

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PlayInteractionFor

Property	Value
Packet ID	0x124 (292)
Compressed	No
Fixed Block Size	19 bytes
Variable Field Count	2
Max Size	15.6 MB
Nullable Bit Field	1 byte(s)
Variable Block Start	27

Fields

Name	Type	Offset	Size	Encoding	Nullable
entityId	int	1	4	int32_le	No
chainId	int	5	4	int32_le	No
forkedId	ForkedChainId	-1	var	nested:ForkedChainId	Yes
operationIndex	int	9	4	int32_le	No
interactionId	int	13	4	int32_le	No
interactedItemId	String	-1	var	var_string:utf8	Yes
interactionType	InteractionType	17	1	byte	No
cancel	boolean	18	1	byte	No

Layout Notes: Fixed block contains 6 fixed fields, nullable bits at offset 0, offsets to variable data at offset + 19 and + 23 respectively

interactionType enum values:

• 0 = Primary
• 1 = Secondary
• 2 = Ability1
• 3 = Ability2
• 4 = Ability3
• 5 = Use
• 6 = Pick
• 7 = Pickup
• 8 = CollisionEnter
• 9 = CollisionLeave
• 10 = Collision
• 11 = EntityStatEffect
• 12 = SwapTo
• 13 = SwapFrom
• 14 = Death
• 15 = Wielding
• 16 = ProjectileSpawn
• 17 = ProjectileHit
• 18 = ProjectileMiss
• 19 = ProjectileBounce
• 20 = Held
• 21 = HeldOffhand
• 22 = Equipped
• 23 = Dodge
• 24 = GameModeSwap

---

MountNPC

Property	Value
Packet ID	0x125 (293)
Compressed	No
Fixed Block Size	16 bytes
Variable Field Count	0
Max Size	16 bytes
Variable Block Start	16

Fields

Name	Type	Offset	Size	Encoding	Nullable
anchorX	float	0	4	float32_le	No
anchorY	float	4	4	float32_le	No
anchorZ	float	8	4	float32_le	No
entityId	int	12	4	int32_le	No

Layout Notes: All fields are fixed size and located sequentially within the fixed block of 16 bytes.

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DismountNPC

Property	Value
Packet ID	0x126 (294)
Compressed	No
Variable Field Count	0

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