Anvils

The two tables behind every HBM anvil: two-slot smithing and the construction list.

Type	Machines	Schema	Picked by	Rows in HBM
`hbm:anvil_smithing`	every HBM anvil (smithing slots)	own	first match in `order` with a high enough tier	29
`hbm:anvil_construction`	every HBM anvil (construction list)	own	player picks it; the craft names the recipe id	258

Both tables take ingredients (including the Stirling engine form) and item stacks with item_data.

Tiers. Each anvil block has a tier, and a recipe needs an anvil of at least its tier. With LESS BULLSHIT MODE / LBSM_recipeUnlockAnvil on (and LBSM on) every recipe of both tables is tier 1, applied when the tables load.

anvil_smithing

Two input slots, matched live as the player puts items in. The anvil uses the first row in order that matches both slots and whose tier the anvil reaches.

Field	Type	Required	Default	Meaning
`tier`	int	yes		Lowest anvil tier.
`output`	item stack	yes		The product.
`left`	ingredient	yes		Left slot, with its count.
`right`	ingredient	yes		Right slot, with its count.
`hot`	boolean	no	`false`	Both inputs must be hot (heated) items; the output takes their averaged heat.
`shapeless`	boolean	no	`false`	The two inputs may also be swapped.
`order`	int	no	after HBM’s	Order in the anvil and recipe viewers.

{
  "type": "hbm:anvil_smithing",
  "tier": 1,
  "output": "hbm:anvil_arsenic_bronze",
  "left": { "ingredient": "hbm:anvil_iron" },
  "right": { "ingredient": "#c:ingots/arsenic_bronze", "count": 10 },
  "order": 5
}

Some smithing recipes are code, not rows, and cannot be removed: the dusted-steel folding chain, the casting molds, cyanide and renaming. They sit at fixed positions in HBM’s order (orders 18 to 27 and 39 to 57), so a row with an order in those ranges sorts among them.

anvil_construction

The browsable recipe list. The player crafts straight from their inventory, and the craft request names the recipe by its id (hbm:anvil_construction/chimney_brick).

Field	Type	Required	Default	Meaning
`inputs`	list of ingredients	yes		Taken from the player’s inventory.
`outputs`	list of outputs (below)	yes		Given to the player.
`tier`	int	yes		Lowest anvil tier.
`tier_upper`	int	no	none	Highest anvil tier, for a recipe only lower anvils may do.
`overlay`	`none`, `construction`, `recycling` or `smithing`	no	by shape	The icon overlay in the list.
`requires`	list of strings	no	none	Config conditions, tested when the table loads.
`order`	int	no	after HBM’s	List order.

An output is an object (not a bare string): {"id", "count", "item_data", "chance"}, where chance (0 to 1, default 1) is the chance to get it.

Without overlay, it follows the shape: one input and one output is smithing, several inputs and one output construction, one input and several outputs recycling, anything else none. A recycling row shows its input as the icon.

{
  "type": "hbm:anvil_construction",
  "inputs": [
    { "ingredient": "#c:plates/steel", "count": 4 },
    { "ingredient": "minecraft:bricks", "count": 16 },
    { "ingredient": "hbm:steel_grate", "count": 2 }
  ],
  "outputs": [{ "id": "hbm:chimney_brick" }],
  "tier": 2,
  "order": 87
}

{
  "type": "hbm:anvil_construction",
  "inputs": [{ "ingredient": "hbm:chunk_ore_rare" }],
  "outputs": [
    { "id": "hbm:fragment_boron" },
    { "id": "hbm:fragment_boron", "chance": 0.5 },
    { "id": "hbm:fragment_lanthanium", "chance": 0.1 }
  ],
  "tier": 2,
  "order": 202
}

HBM’s assembly machine construction recipe is two rows, one with "requires": ["expensive_mode"] and one with "!expensive_mode", and the RBMK and research reactor dismantling rows need "!enable_528".