Spawn Predicate

Bee spawn biome modifiers may include an optional spawnPredicate using Minecraft's LocationPredicate codec.

All known top-level fields are optional.

Field	Type	Required	Default	Notes
position	Position predicate	No	—	Optional x/y/z bounds.
biomes	Biome holder set	No	—	Additional biome constraint.
structures	Structure holder set	No	—	Structure membership constraint.
dimension	dimension identifier	No	—	Example: minecraft:overworld.
smokey	boolean	No	—	Matches smokey locations.
light	Light predicate	No	—	Constrains light level.
block	Block predicate	No	—	Constrains block at the tested location.
fluid	Fluid predicate	No	—	Constrains fluid at the tested location.
can_see_sky	boolean	No	—	Constrains sky visibility.

Position predicate

x, y, and z each use MinMaxBounds.Doubles and are optional.

A bound can be an exact number:

{
  "position": {
    "y": 64
  }
}

or an object:

{
  "position": {
    "y": {
      "min": 60.0,
      "max": 128.0
    }
  }
}

The codec rejects min > max.

Light predicate

light.light uses integer min/max bounds.

{
  "light": {
    "light": {
      "min": 8,
      "max": 15
    }
  }
}

Block predicate

Known fields include:

Field	Type	Required
blocks	Block holder set	No
state	block-state predicate object	No
nbt	NBT predicate	No

Minecraft data-component matcher fields are flattened into the same block predicate object. Those internals remain intentionally permissive in the schema because their complete codec definitions were not supplied.

Fluid predicate

Known fields are:

Field	Type	Required
fluids	Fluid holder set	No
state	fluid-state predicate object	No

Full example

{
  "position": {
    "y": {"min": 60.0, "max": 128.0}
  },
  "biomes": "#minecraft:is_overworld",
  "dimension": "minecraft:overworld",
  "smokey": false,
  "light": {
    "light": {"min": 8}
  },
  "block": {
    "blocks": ["minecraft:grass_block", "minecraft:dirt"]
  },
  "fluid": {
    "fluids": "minecraft:water"
  },
  "can_see_sky": true
}