ZMJJKK123-hub Attribute
Attributes are the buff/debuff system for mobs, with modifiers adjusting their strength. Java Edition unless noted.
Attributes
Each attribute controls an ability (attack damage, speed, ...); values are doubles (Java). Java attributes have: a range (computed values clamp to it), a type (positive/negative/neutral — determines modifier tooltip color: blue for improving positive attributes, red for worsening, gray for neutral), applicable mobs (the attribute doesn't exist on others), and a default value (base default).
Per-entity attribute data: base (value before modifiers) + modifiers. The final computed value takes effect.
Known Attributes (Java)
The full attribute list (generic.max_health, generic.follow_range, generic.attack_damage, generic.attack_speed, generic.armor, generic.movement_speed, generic.scale, generic.step_height, player., zombie., horse.*, ...): see the Minecraft Wiki "Attribute" page. Bedrock attributes additionally have redefinition modes, sync flags, current min/max/current values, and buffs.
Modifiers
Java modifiers have an id (its name/effect is irrelevant — the effect comes from type (attribute), operation, and amount). Bedrock modifiers carry a UUID, name, operation, operand, and amount. Modifier amounts are unlimited but the final computed value still clamps to the attribute's range.
Sources
Modifiers come from items (in valid slots; zero-durability items' modifiers stop working), enchantments, status effects, location, and entity data. Two modifiers with the same id (Java) or identical base attributes (Bedrock) on the same attribute replace each other — they don't stack.
Persistence
Non-persistent modifiers (all enchantment attribute effects, item modifiers) exist only in memory and can't be fetched by /data (only /attribute); persistent ones (status effect modifiers) save with the entity. Effects on computed values are identical.
Operations
Applied in fixed order to base (and min/max in Bedrock):
- Op0 add_value: Result0 = base + ΣOp0ᵢ (e.g. 3 + 2 + 4 = 9).
- Op1 add_multiplied_base: Result1 = Result0 × (1 + ΣOp1ⱼ) (e.g. 9 × (1+3+6) = 90).
- Op2 add_multiplied_total: Result2 = Result1 × ∏(1 + Op2ₖ) (e.g. 90 × 3 × 5 = 1350).
Total: (base + ΣOp0ᵢ) × (1 + ΣOp1ⱼ) × ∏(1 + Op2ₖ). Bedrock additionally applies the redefinition mode and a cap (Op3) clamp: clamp(Result2_current, currentMin, min(currentMax, Op3ᵢ)).
Tooltip Display (Java)
Tooltips show item-granted modifiers (from attribute_modifiers component, enchantment attribute effects, active status effects); 2 decimals; zero amounts hidden; base_attack_damage/base_attack_speed modifier IDs render dark green (offset, no "+", showing the sum with the attribute base); Infinity shows "∞".
Buffs (Bedrock)
Instantaneous (apply once, not persistent) and temporal (per-tick, removed after their lifetime) buffs add to the current values (addition; negatives subtract — e.g. health: positive = heal, negative = damage). They may be blocked (damage_sensor), redirected (absorption), or altered (totem sets health to 1.0).
Examples
attribute @s minecraft:scale modifier add scale_bonus 0.25 add_value
give @s diamond_sword[attribute_modifiers=[{type:"attack_damage", id:"minecraft:base_attack_damage", slot:"mainhand", amount:20, operation:"add_value"}]]
summon zombie ~ ~ ~ {attributes:[{id:"follow_range",base:100.0d}]}