S39PacketPlayerAbilities — Minecraft 1.8.9 Packet Reference

0x39 S39PacketPlayerAbilities

Server updates the player's capabilities (flying, invulnerable, creative, fly speed, walk speed).

Clientbound (Server → Client) · PLAY · net/minecraft/network/play/server/S39PacketPlayerAbilities.java

playerabilitiesflight

Fields

Field	Type	Description
flags	byte bitmask	0x01=invulnerable, 0x02=flying, 0x04=allowFlying, 0x08=creative
flySpeed	float	Flight speed (default 0.05)
walkSpeed	float	Walk speed (default 0.1)

Wire Encoding

Field	Type	Notes
Flags	byte	Bitmask
Fly Speed	float	0.05 default
Walk Speed	float	0.1 default

MCP References

MCPNetHandlerPlayClient.handlePlayerAbilities()

Handler Interface

HNDINetHandlerPlayClient

Notes

This is the SERVER→CLIENT version. The server sends this when the player's abilities change. The CLIENT→SERVER version is C13PacketPlayerAbilities (which only carries the isFlying flag).

implementation Implementation Cases

Flight (Tenacity 6.0)

Detect ability changes. Flight checks allowFlying. GodMode tracks invulnerable.

Vanilla hook: EventReceivePacket

GodMode (Tenacity 6.0)

Detect ability changes. Flight checks allowFlying. GodMode tracks invulnerable.

Vanilla hook: EventReceivePacket

CreativeFly (Tenacity 6.0)

Detect ability changes. Flight checks allowFlying. GodMode tracks invulnerable.

Vanilla hook: EventReceivePacket

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