Flags

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

A flag permits something when it is present. Removing it forbids that thing. Set them with /claim setflag <flag> <true|false>, flip them with /claim toggleflag <flag>, or use the flags menu.

The New column is whether the flag is in claimSettings.defaultFlags: what a freshly created claim gets.

Security and damage

Flag	When present	New
`PVP`	Players may damage each other inside the claim	off
`KEEP_INVENTORY`	Players keep their inventory when they die here	off
`CREEPER_DAMAGE`	Creeper explosions may break blocks	on
`WITHER_DAMAGE`	The wither may break blocks	on
`FIRE_SPREAD`	Fire may spread from block to block	on
`LIGHTNING_DAMAGE`	Lightning may set fires and damage entities	off
`MOB_GRIEFING`	Mobs may change blocks (endermen, sheep, villagers)	off

Explosions

Flag	When present	New
`TNT_EXPLOSIONS`	TNT may break blocks	on
`END_CRYSTAL_DAMAGE`	End crystals may explode destructively	off
`BED_EXPLOSION`	Beds may explode in the Nether and the End	off
`FIREBALL_DAMAGE`	Ghast and blaze fireballs may break blocks	off
`DRAGON_DAMAGE`	The ender dragon may break blocks	off
`RESPAWN_ANCHOR_EXPLOSION`	Respawn anchors may explode outside the Nether	off

World mechanics

Flag	When present	New
`FLUID_FLOW`	Water and lava may flow	on
`PISTON_PUSH`	Pistons may push and pull blocks	on
`LEAF_DECAY`	Leaves decay when the tree is cut	off
`ICE_MELT`	Ice and snow melt	off
`BLOCK_FADE`	Blocks fade (coral drying, farmland reverting, snow melting)	off
`BLOCK_FORM`	Blocks form (ice freezing, snow settling, concrete setting)	on
`ENTITY_BLOCK_FORM`	Entities form blocks (a snow golem's trail, frost walker ice)	off
`STRUCTURE_GROW`	Saplings, mushrooms and vines may grow into structures	on
`NATURE_SPREAD`	Grass, mycelium and vines may spread	on

Blocks

Flag	When present	New
`CORAL_FADE`	Coral dies out of water	off
`SCULK_SPREAD`	Sculk may spread from a catalyst	off
`REDSTONE`	Redstone components may fire	on

Mob spawning

Flag	When present	New
`MOB_SPAWNING`	The master switch (off blocks every natural spawn)	on
`SPAWN_ANIMALS`	Passive mobs may spawn naturally	on
`SPAWN_MONSTERS`	Hostile mobs may spawn naturally	on
`SPAWN_PHANTOMS`	Phantoms may spawn	off

Mob behaviour

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

Notes

MOB_SPAWNING overrides the three specific spawn flags. When it is off, nothing spawns naturally, whatever SPAWN_ANIMALS, SPAWN_MONSTERS and SPAWN_PHANTOMS say. The listener checks the master switch first and returns. Leave it on and use the specific flags, unless you want a genuinely mob-free zone.
Explosion flags govern block damage, not entity damage. TNT_EXPLOSIONS off means the TNT still goes off and still hurts whoever is standing next to it: it just does not break the base.
PVP off applies inside the claim only. A player can be chased out of a claim and killed one chunk away. Warp confirmation exists for exactly this reason: teleporting to a public warp in a PVP claim prompts first.
FIRE_SPREAD and the IGNITE permission are different things. IGNITE decides whether a player may put fire down. FIRE_SPREAD decides whether the fire that already exists travels. A claim that allows neither is genuinely fireproof; allowing IGNITE but not FIRE_SPREAD gives you decorative campfires that cannot burn the house down.
REDSTONE off stops the components firing: clocks, dispensers, pistons wired to redstone. It is heavier than it looks, and it is on by default because turning it off breaks most farms.
Changing a default does not change existing claims. claimSettings.defaultFlags only applies at creation. Use /claim admin bulk setflag <flag> <value> to change every loaded claim: read the warning on the Admin commands page first.

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