Flags

All 32 flags, what each permits, and which are on for a new claim.

A flag permits something when it is present in the claim and forbids it when it is absent. The owner sets flags with /claim setflag <flag> <true|false>, flips one with /claim toggleflag <flag>, or uses the Flags menu. Changing a flag also needs the ability node uxmclaims.ability.claim.flag.<flag> in lower case, and waits out uxmclaims.delay.flags (5 seconds by default) between changes.

The New column is whether the flag is in claimSettings.defaultFlags, the set a new claim starts with.

Security and damage

Flag	When present	New
`PVP`	Players may hurt each other: hits, projectiles, harmful splash and lingering potions, and end crystals, TNT or tamed animals set up by another player. Checked where the victim stands.	off
`KEEP_INVENTORY`	A player who dies here keeps items and levels, and drops nothing.	off
`CREEPER_DAMAGE`	Creeper explosions break blocks.	on
`WITHER_DAMAGE`	The wither and its skulls break blocks.	on
`FIRE_SPREAD`	Fire spreads, burns blocks away, and lava or fire ignites blocks.	on
`LIGHTNING_DAMAGE`	Lightning sets blocks on fire.	off
`MOB_GRIEFING`	Mobs without a flag of their own change blocks (sheep eating grass, ravagers, rabbits), and explosions without a flag of their own, a TNT minecart included, break blocks. Mobs and their arrows damage armor stands, item frames, paintings and vehicles.	off

Explosions

Flag	When present	New
`TNT_EXPLOSIONS`	Primed TNT breaks blocks, and so do the block explosions the table below assigns to it. TNT that goes off in a claim without this flag breaks no block anywhere in its blast.	on
`END_CRYSTAL_DAMAGE`	End crystal explosions break blocks.	off
`BED_EXPLOSION`	Exploding beds break blocks.	off
`FIREBALL_DAMAGE`	Ghast fireballs break blocks.	off
`DRAGON_DAMAGE`	The ender dragon breaks blocks.	off
`RESPAWN_ANCHOR_EXPLOSION`	Exploding respawn anchors break blocks. Off in a new claim, so anchors leave its blocks alone.	off

Server	Flag of a block explosion
Paper 1.20.1 and later	Decided by the exploded block: a respawn anchor uses `RESPAWN_ANCHOR_EXPLOSION`, any bed `BED_EXPLOSION`, anything else `TNT_EXPLOSIONS`, such as an explosion another plugin creates at a location
Spigot and older Paper	Decided by the dimension: the Overworld uses `RESPAWN_ANCHOR_EXPLOSION`, the Nether and the End `BED_EXPLOSION`

Primed TNT is an entity explosion, not a block explosion, and always uses TNT_EXPLOSIONS.

World mechanics

Flag	When present	New
`FLUID_FLOW`	Water and lava flow and change level.	on
`PISTON_PUSH`	Pistons inside the claim extend and retract.	on
`LEAF_DECAY`	Leaves decay.	off
`ICE_MELT`	Ice, packed ice, blue ice, snow and snow blocks melt.	off
`BLOCK_FADE`	Any other block fades, such as farmland drying back to dirt. Coral has its own flag; fire always burns out.	off
`BLOCK_FORM`	Blocks form from world conditions: snow and ice in cold weather, cobblestone, stone and obsidian where lava meets water, concrete powder setting.	on
`ENTITY_BLOCK_FORM`	Entities form blocks: a snow golem's trail, Frost Walker ice.	off
`STRUCTURE_GROW`	Saplings and mushrooms grow into trees and huge mushrooms.	on
`NATURE_SPREAD`	Blocks spread on their own: grass, mycelium, vines, small mushrooms.	on

Blocks

Flag	When present	New
`CORAL_FADE`	Coral blocks and fans die out of water.	off
`SCULK_SPREAD`	Sculk spreads from a catalyst.	off
`REDSTONE`	Redstone carries power. Without it every redstone signal in the claim is forced to zero.	on

Mob spawning

These apply to natural spawns only. Spawners, spawn eggs, breeding and commands are never affected.

Flag	When present	New
`MOB_SPAWNING`	The master switch: without it no mob spawns naturally.	on
`SPAWN_ANIMALS`	Animals spawn naturally.	on
`SPAWN_MONSTERS`	Hostile mobs spawn naturally, slimes, ghasts and magma cubes included.	on
`SPAWN_PHANTOMS`	Phantoms spawn.	off

Mob behaviour

Flag	When present	New
`ENDERMAN_PICKUP`	Endermen pick up and place blocks.	off
`ZOMBIE_DOOR_BREAK`	Zombies break doors.	off
`SILVERFISH_INFEST`	Silverfish enter and leave infested blocks.	off

Notes

MOB_SPAWNING overrides the three spawn flags. Without it nothing spawns naturally, whatever SPAWN_ANIMALS, SPAWN_MONSTERS and SPAWN_PHANTOMS say. Mobs that are neither animals nor hostile, such as squid, fish and bats, follow MOB_SPAWNING alone.
Explosion flags decide block damage, not entity damage. With TNT_EXPLOSIONS off the TNT still goes off and still hurts whoever stands next to it; it only leaves the blocks alone. The claim block never breaks.
Villagers and bees are never griefing. Villagers farming and bees growing crops or filling hives are allowed whatever MOB_GRIEFING says.
BLOCK_FORM off breaks cobblestone generators, because lava meeting water forms no block.
PVP off applies inside the claim only. A player can be chased out and killed one chunk away, which is why teleporting to a public warp in a claim with PVP on asks for confirmation.
FIRE_SPREAD and the IGNITE permission are different things. IGNITE decides whether a player may start a fire; FIRE_SPREAD whether the fire travels. Allowing IGNITE but not FIRE_SPREAD gives you campfires that cannot burn the house down.
Cross-border movement is blocked whatever the flags say. Fluids, fire, pistons and growth never cross a claim border; see How protection works.
Changing defaultFlags does not change existing claims. It applies at creation only. Use /claim admin bulk setflag <flag> <true|false> to change every claim; read Admin commands first.

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