Bedrock behavior pack formats: entities, spawn rules, loot tables, trade tables

Researched 2026-10-24 against the composed vanilla behavior pack of Bedrock Dedicated Server (BDS) 1.26.51.1, Mojang/bedrock-samples tag v1.26.50.4 (commit 46ba6ea985fb5a92d79a9419198f10dda14c199d, "min" release asset, sha256 2bb667786f4d5bedf97a61cec4ce9613c1e2986224c9deda5fbb108c2d96b07c), its metadata/json_schemas/, and MicrosoftDocs/minecraft-creator at commit 4432fb62a8e0ce5c785bd2bf02a6f981dcffbbe8 (2026-10-20). It continues Getting vanilla Bedrock data from Mojang's own files and does not repeat it. Every count below comes from scripts listed under Reproduction; every grammar statement names the schema or docs page that owns it.

Summary

• The composed vanilla pack has 129 entity definitions, 60 spawn rules, 309 loot tables and 27 trade tables. The trade tables sit in two archives per layer (trading.brarchive and trading/economy_trades.brarchive); 9 of the 27 are the undocumented \x7fMCB binary in BDS, and the 18 text ones parse equal to the bedrock-samples copies, so the samples are a faithful substitute.
• An entity definition is description plus components plus component_groups plus events. Spawning runs one spawn event (minecraft:entity_spawned, minecraft:entity_born, minecraft:entity_transformed, or the one named by /summon, a spawn rule, minecraft:transformation or minecraft:spawn_entity); the event adds and removes groups; sensors, timers, goals and triggers fire further events. Mojang's own schema (ActorDocument.json) types only the four top-level keys and leaves description, events and upgrades as "Dynamic value".
• Vanilla uses 372 distinct component keys: 192 attribute and behavior components, 170 minecraft:behavior.* goals and 10 minecraft:on_* triggers. Docs list 204 components plus 1 internal and 181 goals plus 1 internal; every vanilla goal is documented, 12 documented goals are unused, and 8 vanilla components (air_drag_modifier, bounciness, can_stand_on_powder_snow, freezing_immune, freezing_vulnerable, not_pickable_from_inside, npc, uses_uniform_air_drag) appear in no docs list. The 1.26.50 schema names 406 component keys but omits minecraft:pushable (27 vanilla entities) and minecraft:behavior.follow_target_captain (2).
• Filters are one grammar shared by entities, spawn rules and trade tables: {test, subject, operator, domain, value} nested under all_of, any_of, none_of (and the schema's AND, OR, NOT, all, any aliases). Vanilla entities use 86 of the 108 documented tests in 1897 instances; is_family alone is 526. Twenty-seven entity files written by the 1.26 serializer encode subject and operator as integers (1 is other, 0 is ==, 1 is !=) and use AND/OR.
• Spawn rules use 21 of the 24 components in the schema. Population pools in vanilla are animal 27, monster 24, water_animal 5, pillager 2, cat 1, ambient 1. Four rules (blaze, cat, pillager, wither_skeleton) have no conditions at all. Mojang documents pool names and per-component parameters, but no spawn attempt rate, no cap values and no light algorithm; the only numbers published are "~10 per player" style approximations in a tutorial.
• The loot grammar is pools[] { rolls, bonus_rolls, conditions[], tiers, entries[] { type, name, weight, quality, functions[], conditions[], pools[] } }. Vanilla uses 23 function spellings (18 functions, 5 of them also in minecraft: form) and 15 conditions; set_count is 590 of 1140 function instances, and conditions sit on 77 pools, 9 entries and 15 functions (furnace_smelt with entity_properties).
• Loot tables are reached from entities (110 distinct tables through minecraft:loot, minecraft:equipment, minecraft:interact, minecraft:barter and four goals), from the 98 data-driven blocks (minecraft:loot), and from other tables (26 nested names). The remaining 80 (54 chests, 5 spawners, 3 dispensers, 1 barrel, 1 pot, 12 under entities/, 3 equipment, 1 block) are referenced only by engine code and structures.
• Trade tables are tiers[] { total_exp_required, groups[] { num_to_select, trades[] { wants[], gives[], trader_exp, max_uses, reward_exp } } } with TradeItem { item, quantity, price_multiplier, functions[], filters } or { choice: [TradeItem] }. Every villager_v2 profession points at trading/economy_trades/*.json through minecraft:economy_trade_table; the 13 legacy trading/*.json tables are referenced only by the legacy minecraft:villager. Demand, discounts and restock are engine behavior parameterized by economy_trade_table fields and minecraft:trade_resupply.
• Sizing: implementing the 20 most used goals covers all goals of 52 of 129 entities (15 of the 92 that have goals); 40 covers 74 (37); 60 covers 86 (49); 80 covers 94 (57); all 170 covers 129. The 20 most used non-goal components cover 5 entities, 60 cover 30, 100 cover 59, 140 cover 88, all 202 cover 129. The zombie, villager_v2, creeper, enderman, iron golem, wolf and cow together need 55 goals and 76 non-goal components, and that set also fully covers husk, mooshroom and 9 non-mob entities.
• 91 of the 170 goals and 58 of the 192 components are used by exactly one entity type, so the long tail is where most of the implementation count sits, and the head is where most entities are.

1. Entity definition grammar

Files and format versions

An entity file is {"format_version": "<semver>", "minecraft:entity": {...}}. Docs: "The format_version at the top of an entity JSON file selects the schema that the game uses to parse that document: which fields are valid, how they're interpreted, and what defaults are applied. Files written against an older format_version will continue to work" (Documents/entity-versioning.md). The composed vanilla files use 1.26.50 (56 files), 1.26.0 (34), 1.26.30 (19), 1.26.20 (10), 1.26.10 (8), 1.26.40 (1) and 1.21.90 (1, agent.json). Version gates that the docs state: root-level event filters need 1.19.20 (Documents/EntityEvents.md); queue_command needs 1.20.60, emit_particle and play_sound need 1.21.50 (EventActions/*.md); entity_version and the upgrades section need 1.26.20 plus the "Upcoming Creator Features" experiment (entity-versioning.md); minecraft:interact entries default swing to true from 1.26.0 (minecraftComponent_interact.md). The bedrock-samples schemas are versioned per key: server/entity/<version>/ holds 407 files across 13 versions (1.21.80 to 1.26.50 plus beta), each component body appearing in the version that last changed it, so a reader has to pick, per component, the newest schema at or below the file's format_version.

The top level

ActorDocument.json (1.26.50) declares five properties: description (required, "Dynamic value"), components (ref Entity component definitions.json), component_groups (object of the same), events ("Dynamic value") and upgrades ("Dynamic value"). Entity component definitions.json names 406 keys and types every one of them as "Dynamic value"; the real bodies are the 229 minecraft_*.json files (173 goals, 56 components) spread over the version folders. So the schema is a key list, not a validator, for the remaining 177 keys.

description

Vanilla usage over 129 files: identifier 129, is_spawnable 129 (true 91), is_summonable 129 (true 110), spawn_category 108 (monster 44, creature 33, misc 21, water_ambient 4, water_creature 3, axolotls 1, ambient 1, underground_water_creature 1), is_experimental 31 (true once, agent), properties 18. runtime_identifier, animations, scripts and entity_version appear in no vanilla file. Docs (Documents/EntityBehaviorIntroduction.md): is_spawnable "If true, a spawn egg for the entity is added to the creative inventory"; is_summonable "If true, the entity can be summoned using the /summon command"; runtime_identifier "can be used to inherit custom mechanics from Vanilla entities that are not yet available as a component"; animations "A list of behavior animations or behavior animation controllers ... used to run commands or events on the entity"; scripts "can be used to play behavior animations"; spawn_category "Currently not fully implemented, so we recommend that creators do not set a value for this property ... Available values include monster, creature, ambient, axolotls, underground_water_creature, water_creature, water_ambient and misc." Mojang's generated Entities.html (bedrock-samples documentation/) says of spawn_category: "This entity will spawn with the rest of this Spawn Category type."

Entity properties

description.properties maps a namespaced name to {type, default, range | values, client_sync}. Docs (Documents/IntroductionToEntityProperties.md): four types int, float, enum, bool; int and float take range: [min, max] and clamp silently; enum takes values (at most 16 entries, each 1 to 32 characters, starting with a letter); at most 32 properties per entity type; client_sync: true sends the value to clients for render and animation controllers; values persist in saved entities and are keyed by name, so a rename discards the data. default is a literal or a Molang expression; a default expression "cannot assign or read Molang variables" and may only call query.had_component_group, which exists to migrate saved component-group state. Events change properties through set_property, whose value may be a literal or a Molang expression that may read query.property and query.has_property but no other query. Filters read them through int_property, float_property, bool_property, enum_property (with domain naming the property) and has_property. Vanilla has 29 properties on 18 entities: enum 15, bool 13, int 1 (minecraft:creaking_swaying_ticks); client_sync true 19, false 8, absent 2; defaults are 15 strings, 12 booleans, 1 int and one Molang expression (minecraft:has_nectar on the bee, query.had_component_group('has_nectar')).

components and component_groups

components is the always-active set; component_groups is a map of group name to component map, inactive until an event adds it. Docs (Documents/EntityBehaviorIntroduction.md, repeated in EventActions/add_component_group.md): "As entities can only have one component of each type active, any components in a group that is being added will replace previously added components. Additionally, adding a component group that is already active will cause those components to be re-initialized ... an already-added minecraft:timer that is added again will start its timing logic over." On removal: "removing a component won't make it go back to the previous state of that component ... the component will be removed completely and reset to its default values." Vanilla has 827 component groups across the 129 files (villager_v2 has 54, wolf 18, zombie 13, cow 2, creeper 5, enderman 4, iron_golem 2). Component bodies carry 33 distinct Molang strings in vanilla; the hosts are minecraft:experience_reward.on_death (85, for example query.last_hit_by_player ? Math.Random(1,3) : 0), experience_reward.on_bred (29), ambient_sound_interval.condition (20), rideable.rotate_rider_by (9), behavior.pickup_items.tags (5) and eight single uses. A runtime therefore needs a Molang evaluator for a dozen queries (query.last_hit_by_player, query.equipment_count, query.is_baby, query.head_is_in_water, query.has_any_family, Math.Random) to run vanilla, not a full one.

events

An event is a node; a node may contain add and remove ({"component_groups": [...]}), trigger (event name string, or {event, target}), filters, set_property, sequence (array of nodes run in order), randomize (array of nodes with weight, one chosen), and the actions in EventActions.md: queue_command, emit_vibration (entity_interact, entity_act, entity_die), emit_particle, play_sound, reset_target. Trigger target choices are self, other, player, target, baby, parent (EventActions/trigger.md). Nodes nest "indefinitely" (Documents/EntityEvents.md). Execution: "the effects of that event are determined immediately, but those changes are not applied to the entity until the entity ticks on the server side ... filters in later entries in a sequence array won't see changes from earlier in that array" (EntityEvents.md, repeated in the generated Entity Events.html). Vanilla's 850 events use add 1163, remove 437, weight 437, filters 315, trigger 176 (174 strings, 2 {event, target} objects), sequence 123, randomize 116, set_property 105, play_sound 23 (11 entities), set_home_position 17 (nautilus, zombie_nautilus, happy_ghast), first_valid 11 (9 entities; an array of filtered nodes of which the first passing one runs), emit_vibration 9, drop_item 2 ({"slot": "slot.weapon.mainhand"}, copper_golem and sulfur_cube), execute_event_on_home_block 2 (creaking), emit_particle 1, reset_target 1, stop_movement 1 (happy_ghast), queue_command 0. first_valid, set_home_position, drop_item, execute_event_on_home_block and stop_movement appear in no docs page and in neither generated HTML, so five of the event actions vanilla relies on are undocumented. The generated Entity Events.html documents only sequence, randomize, trigger, add, remove, set_property and queue_command.

How a definition becomes a running entity

1. Construction. The entity starts with components. The engine then runs one spawn event: minecraft:entity_spawned for natural spawns, spawn eggs and spawners; minecraft:entity_born when minecraft:behavior.breed or minecraft:spawn_entity (default spawn_event minecraft:entity_born) creates it; minecraft:entity_transformed when minecraft:transformation creates it; minecraft:on_prime when a TNT minecart is primed; or the event named in /summon, in a spawn rule's minecraft:herd.event, initial_event or minecraft:spawn_event, in permute_type.entity_type (minecraft:pillager<minecraft:spawn_as_patrol_follower>) or in transformation.into (minecraft:drowned<minecraft:as_adult>). Docs: "You can think of it as a constructor ... The entity starts with the default-included components list ... Then it also gets the effects of its spawn event" and "minecraft:entity_spawned ... won't run if you manually /summon it" because /summon substitutes its own spawn event (EntityEvents.md). Vanilla defines minecraft:entity_spawned on 82 entities, minecraft:entity_born on 43, minecraft:entity_transformed on 8 and minecraft:on_prime on 1. The zombie's spawn event is sequence[ randomize[ as_adult 9500, as_baby 425, as_baby_jockey 75 ], randomize[ add can_break_doors 10, nothing 90 ] ]; the cow's is sequence[ randomize[ spawn_adult 95, add cow_baby 5 ], first_valid[ biome tag warm, biome tag cold, default ] set_property minecraft:climate_variant ].
2. Group changes. Each add/remove replaces or deletes components by key, and the engine re-initializes re-added ones. Zombie events swap minecraft:zombie_adult for minecraft:zombie_baby (which carries its own minecraft:scale, collision_box, movement, experience_reward and a different type_family).
3. Sensors and timers. minecraft:environment_sensor is a list of {filters, event, target} triggers evaluated against the world each tick (zombie: is_underwater fires minecraft:start_transforming_into_drowned); minecraft:timer fires time_down_event after time seconds or a weighted random_time_choices pick, optionally looping; minecraft:damage_sensor fires on_damage per damage cause and can set deals_damage to yes, no, no_but_side_effects_apply or no_but_entity_effects_apply; minecraft:target_nearby_sensor, minecraft:entity_sensor, minecraft:block_sensor, minecraft:rail_sensor and minecraft:inside_block_notifier are the other polling sensors. minecraft:interact is a list of interactions[] { on_interact {filters, event, target}, use_item, transform_to_item, hurt_item, swing, play_sounds, interact_text, add_items {table}, spawn_items {table}, equip_item_slot, drop_item_slot, health_amount, cooldown, give_item, admire, barter }; the cow's bucket interaction is filters all_of[is_family other player, has_equipment other hand bucket:0] with transform_to_item: bucket:1, and the creeper's flint-and-steel interaction fires minecraft:start_exploding_forced.
4. Triggers. Ten event-shaped minecraft:on_* components use {event, target, filters} bodies the engine fires at fixed points: on_target_acquired (22 entities), on_target_escape (10), on_friendly_anger (3), on_hurt (3), on_hurt_by_player (2), on_death, on_start_landing, on_start_takeoff, and on_wake_with_owner (1 each). The eleventh, on_equipment_changed, uses slot entries with on_equip and on_unequip events for the seven default equipment slots. on_ignite is documented but unused.
5. Goals. Each minecraft:behavior.* has priority ("0 is the highest priority ... If the entity is busy doing a low priority behavior and a high priority behavior comes up, the entity will immediately switch", EntityBehaviorIntroduction.md) and control_flags (move, look, jump per the goal schemas), and many take event hooks (on_attack, on_kill, on_tempt_end, on_celebration_end_event, on_escape_event).
6. Transformation. minecraft:transformation { into, delay {value | block_assist_chance, block_chance, block_max, block_radius, block_types, range_min, range_max}, add {component_groups}, keep_level, keep_owner, preserve_equipment, drop_equipment, drop_inventory, begin_transform_sound, transformation_sound } replaces the entity with a new definition and runs minecraft:entity_transformed on it, where filters with subject: other read the old entity (zombie_pigman example in EntityEvents/minecraftEvents_entity_transformed.md). The zombie's minecraft:convert_to_drowned group pairs minecraft:is_shaking with transformation { delay 15, preserve_equipment, into "minecraft:drowned<minecraft:as_adult>" }.
7. Variant state. minecraft:variant, minecraft:mark_variant and minecraft:skin_id each hold one integer value; the docs call them components that "can store an integer value" for animations and render controllers (EntityBehaviorIntroduction.md). Filters is_variant, is_mark_variant, is_skin_id read them; loot conditions has_variant and has_mark_variant read the first two; trade item filters read is_mark_variant. Vanilla sets variant in 29 entities (wolf coat groups minecraft:wolf_pale are {"minecraft:variant": {"value": 0}}), mark_variant in 8, skin_id in 3. On the wire they travel as the actor data fields VARIANT, MARK_VARIANT and SKIN_ID in SetActorDataPacket and AddActorPacket (Mojang/bedrock-protocol-docs lists these metadata ids; the entity JSON itself does not mention the network), and is_baby, is_tamed, is_sheared, is_saddled, is_charged, is_ignited, is_illager_captain, is_stackable and the rest of the is_* flag components are the sources of the corresponding actor flags.
8. Despawn. minecraft:despawn applies "standard despawn rules" (despawn_from_distance {min_distance 32, max_distance 128}, despawn_from_chance with min_range_random_chance 800, despawn_from_inactivity with min_range_inactivity_timer 30, despawn_from_simulation_edge) or, if filters is set, despawns when they pass (minecraftComponent_despawn.md). minecraft:persistent opts out; minecraft:instant_despawn removes immediately. 76 vanilla entities carry despawn, 67 of them as the empty-object default.
9. Versioned upgrades. description.entity_version.upgrades[] {upgrade_to, name} plus a top-level upgrades map of event-shaped handlers run once when a saved entity loads at a lower version (entity-versioning.md). Vanilla does not use it yet; the zombie horse still uses the older pattern of a minecraft:was_upgraded_to_1_21_130 property plus an environment_sensor trigger.

2. Component inventory from vanilla

Counts are over the 129 composed files. "Entities" is the number of entity files whose base components or any component group use the key; "Instances" counts every occurrence, so a key present in three groups of one entity counts three.

Cross-check against the docs

• Docs ComponentList.md lists 204 components plus one in "Internal/Deprecated Components" (scaffolding_climber). AIGoalList.md lists 181 goals plus one internal (behavior.move_to_lava). TriggerList.md lists 11 triggers. FilterList.md lists 108 tests.
• All 170 vanilla goals are in the docs list. The 12 documented goals vanilla does not use: break_door, door_interact, enderman_leave_block, enderman_take_block, follow_target_leader, hover, move_to_poi, move_towards_restriction, restrict_sun, vex_copy_owner_target, vex_random_move, and the internal move_to_lava. The enderman now uses the generic take_block and place_block ("like Endermen placing their carried block or snow golems leaving snow trails", AIGoalList.md).
• Vanilla non-goal components absent from ComponentList.md under any name: minecraft:air_drag_modifier, minecraft:bounciness, minecraft:can_stand_on_powder_snow, minecraft:freezing_immune, minecraft:freezing_vulnerable, minecraft:not_pickable_from_inside, minecraft:npc, minecraft:uses_uniform_air_drag. All eight are in the 1.26.50 schema key list. minecraft:health, minecraft:trust and minecraft:balloonable are listed under the bare titles "Health", "Trust", "Balloonable".
• Documented components vanilla does not use (20): apply_knockback_rules_instance, body_rotation_axis_aligned, body_rotation_locked_to_vehicle, dash, default_look_angle, entity_armor_equipment_slot_mapping, floats_in_liquid, ground_offset, ignore_cannot_be_attacked, input_air_controlled, navigation.swim, push_through, remove_in_peaceful, scale_by_age, sound_volume, spawn_on_death, walk_animation_speed, wants_jockey, wither_target_highest_damage, scaffolding_climber.
• Restrictions the docs state in descriptions: behavior.move_through_village "Can only be used by Villagers"; on_start_landing and on_start_takeoff "Only usable by the Ender Dragon"; melee_attack and melee_box_attack melee_fov is "used by the hard-coded sensing component"; variable_max_auto_step is "Incompatible with runtime_identifier: minecraft:horse" (generated Entities.html).

(a) Attribute and non-goal components (192)

Component	Entities	Instances	In base components	In component groups
minecraft:physics	126	126	126	0
minecraft:collision_box	125	168	119	49
minecraft:type_family	124	195	115	80
minecraft:conditional_bandwidth_optimization	117	117	117	0
minecraft:health	94	104	89	15
minecraft:nameable	94	94	94	0
minecraft:movement	93	116	78	38
minecraft:is_hidden_when_invisible	92	92	92	0
minecraft:pushable_by_block	91	97	86	11
minecraft:hurt_on_condition	87	88	86	2
minecraft:pushable_by_entity	85	100	79	21
minecraft:breathable	84	86	82	4
minecraft:experience_reward	80	87	42	45
minecraft:jump.static	79	79	78	1
minecraft:loot	78	94	49	45
minecraft:despawn	76	76	74	2
minecraft:navigation.walk	66	70	64	6
minecraft:movement.basic	65	65	65	0
minecraft:can_climb	57	57	56	1
minecraft:attack	48	61	30	31
minecraft:scale	48	54	6	48
minecraft:is_baby	44	44	1	43
minecraft:leashable	43	43	37	6
minecraft:offspring	43	43	43	0
minecraft:spawn_egg_interaction	43	43	43	0
minecraft:leashable_to	42	42	8	34
minecraft:damage_sensor	40	43	35	8
minecraft:balloonable	39	39	39	0
minecraft:rideable	36	68	10	58
minecraft:ageable	35	35	1	34
minecraft:ambient_sound_interval	32	38	22	16
minecraft:interact	32	41	11	30
minecraft:environment_sensor	29	68	12	56
minecraft:variant	29	185	5	180
minecraft:follow_range	27	27	27	0
minecraft:pushable	27	27	26	1
minecraft:breedable	26	26	1	25
minecraft:angry	20	25	0	25
minecraft:inventory	20	20	11	9
minecraft:shareables	19	22	16	6
minecraft:timer	19	27	1	26
minecraft:equipment	18	28	13	15
minecraft:persistent	18	19	13	6
minecraft:projectile	18	23	18	5
minecraft:equip_item	17	17	16	1
minecraft:fire_immune	16	16	15	1
minecraft:is_tamed	16	16	4	12
minecraft:shooter	15	21	8	13
minecraft:underwater_movement	15	21	12	9
minecraft:healable	14	14	12	2
minecraft:navigation.generic	14	20	14	6
minecraft:transformation	14	20	0	20
minecraft:knockback_resistance	13	27	10	17
minecraft:burns_in_daylight	11	11	11	0
minecraft:dimension_bound	10	10	9	1
minecraft:equippable	10	10	1	9
minecraft:explode	10	16	3	13
minecraft:home	10	16	8	8
minecraft:is_saddled	10	10	0	10
minecraft:uses_legacy_friction	10	10	10	0
minecraft:input_ground_controlled	9	9	1	8
minecraft:is_shaking	9	11	0	11
minecraft:movement.sway	9	9	9	0
minecraft:buoyant	8	18	7	11
minecraft:dweller	8	21	2	19
minecraft:freezing_immune	8	8	7	1
minecraft:game_event_movement_tracking	8	8	8	0
minecraft:mark_variant	8	64	4	60
minecraft:renders_when_invisible	8	8	8	0
minecraft:can_fly	7	7	7	0
minecraft:spawn_entity	7	7	1	6
minecraft:addrider	6	20	0	20
minecraft:annotation.break_door	6	6	0	6
minecraft:is_stackable	6	6	6	0
minecraft:mob_effect_immunity	6	6	5	1
minecraft:tamemount	6	6	0	6
minecraft:annotation.open_door	5	5	5	0
minecraft:block_climber	5	5	5	0
minecraft:can_join_raid	5	5	5	0
minecraft:can_power_jump	5	5	1	4
minecraft:flocking	5	5	5	0
minecraft:horse.jump_strength	5	5	5	0
minecraft:rail_movement	5	5	5	0
minecraft:tameable	5	5	0	5
minecraft:variable_max_auto_step	5	6	4	2
minecraft:apply_knockback_rules	4	4	4	0
minecraft:area_attack	4	7	0	7
minecraft:attack_cooldown	4	4	0	4
minecraft:can_stand_on_powder_snow	4	4	4	0
minecraft:color	4	51	0	51
minecraft:dash_action	4	6	0	6
minecraft:entity_sensor	4	7	1	6
minecraft:flying_speed	4	6	3	3
minecraft:is_chested	4	4	0	4
minecraft:is_collidable	4	4	3	1
minecraft:mob_effect	4	4	1	3
minecraft:rail_sensor	4	8	1	7
minecraft:rotation_locked_to_vehicle	4	4	4	0
minecraft:sittable	4	4	0	4
minecraft:spell_effects	4	6	0	6
minecraft:target_nearby_sensor	4	7	2	5
minecraft:body_rotation_blocked	3	3	0	3
minecraft:damage_over_time	3	3	0	3
minecraft:free_camera_controlled	3	3	0	3
minecraft:freezing_vulnerable	3	3	3	0
minecraft:is_dyeable	3	3	0	3
minecraft:is_sheared	3	3	0	3
minecraft:movement.amphibious	3	3	3	0
minecraft:movement.hover	3	3	2	1
minecraft:movement.jump	3	8	2	6
minecraft:navigation.float	3	3	2	1
minecraft:navigation.hover	3	3	2	1
minecraft:preferred_path	3	4	2	2
minecraft:water_movement	3	3	3	0
minecraft:attack_damage	2	2	2	0
minecraft:block_movement_slowdown_immunity	2	2	2	0
minecraft:block_sensor	2	2	1	1
minecraft:boostable	2	2	0	2
minecraft:boss	2	2	2	0
minecraft:custom_hit_test	2	4	0	4
minecraft:drying_out_timer	2	2	0	2
minecraft:economy_trade_table	2	15	1	14
minecraft:genetics	2	2	2	0
minecraft:group_size	2	2	0	2
minecraft:inside_block_notifier	2	2	2	0
minecraft:instant_despawn	2	2	0	2
minecraft:is_illager_captain	2	4	0	4
minecraft:item_controllable	2	2	0	2
minecraft:looked_at	2	3	1	2
minecraft:movement_sound_distance_offset	2	2	2	0
minecraft:navigation.climb	2	2	2	0
minecraft:not_pickable_from_inside	2	2	0	2
minecraft:out_of_control	2	4	0	4
minecraft:rotation_axis_aligned	2	2	0	2
minecraft:scheduler	2	8	1	7
minecraft:skin_id	2	12	0	12
minecraft:strength	2	10	0	10
minecraft:underwater_mount_breathing	2	2	0	2
minecraft:vibration_listener	2	2	2	0
minecraft:admire_item	1	1	1	0
minecraft:air_drag_modifier	1	13	0	13
minecraft:anger_level	1	1	1	0
minecraft:barter	1	1	0	1
minecraft:body_rotation_always_follows_head	1	1	1	0
minecraft:bounciness	1	13	0	13
minecraft:break_blocks	1	1	1	0
minecraft:bribeable	1	1	0	1
minecraft:cannot_be_attacked	1	1	1	0
minecraft:celebrate_hunt	1	1	0	1
minecraft:color2	1	37	0	37
minecraft:combat_regeneration	1	1	1	0
minecraft:exhaustion_values	1	1	1	0
minecraft:friction_modifier	1	13	0	13
minecraft:giveable	1	1	1	0
minecraft:grows_crop	1	1	0	1
minecraft:heartbeat	1	1	1	0
minecraft:hide	1	1	1	0
minecraft:insomnia	1	1	1	0
minecraft:is_charged	1	1	0	1
minecraft:is_ignited	1	2	0	2
minecraft:is_pregnant	1	1	0	1
minecraft:is_stunned	1	1	0	1
minecraft:item_hopper	1	1	0	1
minecraft:jump.dynamic	1	1	1	0
minecraft:lava_movement	1	1	1	0
minecraft:managed_wandering_trader	1	1	0	1
minecraft:movement.fly	1	1	1	0
minecraft:movement.generic	1	1	1	0
minecraft:movement.glide	1	1	1	0
minecraft:movement.skip	1	1	1	0
minecraft:navigation.fly	1	1	1	0
minecraft:npc	1	1	1	0
minecraft:peek	1	1	1	0
minecraft:player.exhaustion	1	1	1	0
minecraft:player.experience	1	1	1	0
minecraft:player.level	1	1	1	0
minecraft:player.saturation	1	1	1	0
minecraft:raid_trigger	1	1	0	1
minecraft:ravager_blocked	1	1	1	0
minecraft:reflect_projectiles	1	1	1	0
minecraft:suspect_tracking	1	1	1	0
minecraft:teleport	1	2	1	1
minecraft:tick_world	1	1	1	0
minecraft:trade_resupply	1	1	0	1
minecraft:trade_table	1	12	0	12
minecraft:trail	1	1	1	0
minecraft:transient	1	1	1	0
minecraft:trust	1	1	0	1
minecraft:trusting	1	1	0	1
minecraft:uses_uniform_air_drag	1	1	0	1
minecraft:vertical_movement_action	1	1	0	1
minecraft:vibration_damper	1	1	1	0

(b) Goals (170)

Goal	Entities	Instances	In base components	In component groups
minecraft:behavior.look_at_player	69	69	65	4
minecraft:behavior.random_stroll	64	65	59	6
minecraft:behavior.random_look_around	55	55	54	1
minecraft:behavior.float	49	49	48	1
minecraft:behavior.nearest_attackable_target	49	55	37	18
minecraft:behavior.hurt_by_target	42	43	38	5
minecraft:behavior.panic	37	43	30	13
minecraft:behavior.melee_box_attack	32	36	13	23
minecraft:behavior.tempt	31	37	23	14
minecraft:behavior.avoid_mob_type	28	28	23	5
minecraft:behavior.breed	26	29	4	25
minecraft:behavior.mount_pathing	26	27	16	11
minecraft:behavior.follow_parent	24	27	3	24
minecraft:behavior.pickup_items	20	20	18	2
minecraft:behavior.equip_item	17	17	16	1
minecraft:behavior.ranged_attack	14	23	6	17
minecraft:behavior.random_swim	12	12	12	0
minecraft:behavior.player_ride_tamed	10	10	1	9
minecraft:behavior.find_mount	8	8	0	8
minecraft:behavior.flee_sun	7	7	5	2
minecraft:behavior.run_around_like_crazy	6	6	2	4
minecraft:behavior.stomp_turtle_egg	6	6	6	0
minecraft:behavior.swim_idle	6	6	6	0
minecraft:behavior.swim_wander	6	6	6	0
minecraft:behavior.celebrate	5	5	0	5
minecraft:behavior.follow_owner	5	5	1	4
minecraft:behavior.leap_at_target	5	6	3	3
minecraft:behavior.move_to_village	5	5	0	5
minecraft:behavior.use_kinetic_weapon	5	7	2	5
minecraft:behavior.look_at_entity	4	4	3	1
minecraft:behavior.move_to_water	4	5	3	2
minecraft:behavior.move_towards_home_restriction	4	4	4	0
minecraft:behavior.stay_while_sitting	4	4	1	3
minecraft:behavior.teleport_to_owner	4	4	0	4
minecraft:behavior.timer_flag_1	4	6	1	5
minecraft:behavior.float_wander	3	3	2	1
minecraft:behavior.go_home	3	3	0	3
minecraft:behavior.look_at_trading_player	3	3	3	0
minecraft:behavior.move_towards_dwelling_restriction	3	3	2	1
minecraft:behavior.nearest_prioritized_attackable_target	3	4	1	3
minecraft:behavior.random_hover	3	3	2	1
minecraft:behavior.random_look_around_and_sit	3	3	3	0
minecraft:behavior.slime_float	3	3	2	1
minecraft:behavior.slime_keep_on_jumping	3	3	2	1
minecraft:behavior.slime_random_direction	3	3	2	1
minecraft:behavior.take_flower	3	3	1	2
minecraft:behavior.trade_with_player	3	3	3	0
minecraft:behavior.aquatic_charge_attack	2	2	0	2
minecraft:behavior.avoid_block	2	2	2	0
minecraft:behavior.celebrate_survive	2	2	0	2
minecraft:behavior.charge_held_item	2	2	1	1
minecraft:behavior.controlled_by_player	2	2	0	2
minecraft:behavior.drink_potion	2	2	2	0
minecraft:behavior.follow_caravan	2	2	0	2
minecraft:behavior.follow_mob	2	2	0	2
minecraft:behavior.follow_target_captain	2	2	0	2
minecraft:behavior.guardian_attack	2	3	2	1
minecraft:behavior.harvest_farm_block	2	3	0	3
minecraft:behavior.jump_to_block	2	2	2	0
minecraft:behavior.lay_egg	2	2	0	2
minecraft:behavior.make_love	2	2	0	2
minecraft:behavior.move_indoors	2	2	2	0
minecraft:behavior.move_outdoors	2	2	0	2
minecraft:behavior.move_to_land	2	2	1	1
minecraft:behavior.move_to_random_block	2	2	0	2
minecraft:behavior.ocelot_sit_on_block	2	2	0	2
minecraft:behavior.ocelotattack	2	2	2	0
minecraft:behavior.place_block	2	2	1	1
minecraft:behavior.play	2	2	0	2
minecraft:behavior.raid_garden	2	2	2	0
minecraft:behavior.receive_love	2	2	0	2
minecraft:behavior.share_items	2	2	2	0
minecraft:behavior.slime_attack	2	2	2	0
minecraft:behavior.squid_dive	2	2	2	0
minecraft:behavior.squid_flee	2	2	2	0
minecraft:behavior.squid_idle	2	2	2	0
minecraft:behavior.squid_move_away_from_ground	2	2	2	0
minecraft:behavior.squid_out_of_water	2	2	2	0
minecraft:behavior.trade_interest	2	15	1	14
minecraft:behavior.admire_item	1	1	1	0
minecraft:behavior.barter	1	1	1	0
minecraft:behavior.beg	1	1	1	0
minecraft:behavior.charge_attack	1	1	1	0
minecraft:behavior.circle_around_anchor	1	1	1	0
minecraft:behavior.croak	1	1	1	0
minecraft:behavior.defend_trusted_target	1	1	0	1
minecraft:behavior.defend_village_target	1	1	0	1
minecraft:behavior.delayed_attack	1	1	0	1
minecraft:behavior.dig	1	1	1	0
minecraft:behavior.dragonchargeplayer	1	1	0	1
minecraft:behavior.dragondeath	1	1	0	1
minecraft:behavior.dragonflaming	1	1	0	1
minecraft:behavior.dragonholdingpattern	1	1	0	1
minecraft:behavior.dragonlanding	1	1	0	1
minecraft:behavior.dragonscanning	1	1	0	1
minecraft:behavior.dragonstrafeplayer	1	1	0	1
minecraft:behavior.dragontakeoff	1	1	0	1
minecraft:behavior.drink_milk	1	1	1	0
minecraft:behavior.drop_item_for	1	1	0	1
minecraft:behavior.eat_block	1	1	1	0
minecraft:behavior.eat_carried_item	1	1	1	0
minecraft:behavior.eat_mob	1	1	1	0
minecraft:behavior.emerge	1	1	0	1
minecraft:behavior.explore_outskirts	1	2	0	2
minecraft:behavior.fertilize_farm_block	1	1	0	1
minecraft:behavior.find_cover	1	2	0	2
minecraft:behavior.find_underwater_treasure	1	1	1	0
minecraft:behavior.fire_at_target	1	1	1	0
minecraft:behavior.float_tempt	1	2	0	2
minecraft:behavior.go_and_give_items_to_noteblock	1	1	1	0
minecraft:behavior.go_and_give_items_to_owner	1	1	1	0
minecraft:behavior.hide	1	1	1	0
minecraft:behavior.hold_ground	1	2	0	2
minecraft:behavior.inspect_bookshelf	1	2	0	2
minecraft:behavior.investigate_suspicious_location	1	1	1	0
minecraft:behavior.jump_around_target	1	1	1	0
minecraft:behavior.knockback_roar	1	1	0	1
minecraft:behavior.lay_down	1	1	0	1
minecraft:behavior.look_at_target	1	1	1	0
minecraft:behavior.melee_attack	1	1	1	0
minecraft:behavior.mingle	1	2	0	2
minecraft:behavior.move_around_target	1	1	1	0
minecraft:behavior.move_through_village	1	1	1	0
minecraft:behavior.move_to_block	1	2	0	2
minecraft:behavior.move_to_liquid	1	1	0	1
minecraft:behavior.move_towards_target	1	1	1	0
minecraft:behavior.nap	1	1	0	1
minecraft:behavior.offer_flower	1	1	1	0
minecraft:behavior.open_door	1	1	1	0
minecraft:behavior.owner_hurt_by_target	1	1	0	1
minecraft:behavior.owner_hurt_target	1	1	0	1
minecraft:behavior.pet_sleep_with_owner	1	1	0	1
minecraft:behavior.play_dead	1	1	1	0
minecraft:behavior.ram_attack	1	2	0	2
minecraft:behavior.random_breach	1	1	1	0
minecraft:behavior.random_fly	1	1	0	1
minecraft:behavior.random_search_and_dig	1	1	0	1
minecraft:behavior.random_sitting	1	2	1	1
minecraft:behavior.restrict_open_door	1	1	1	0
minecraft:behavior.rise_to_liquid_level	1	1	0	1
minecraft:behavior.roar	1	1	1	0
minecraft:behavior.roll	1	2	0	2
minecraft:behavior.scared	1	1	0	1
minecraft:behavior.send_event	1	1	1	0
minecraft:behavior.silverfish_merge_with_stone	1	1	1	0
minecraft:behavior.silverfish_wake_up_friends	1	1	0	1
minecraft:behavior.skeleton_horse_trap	1	1	0	1
minecraft:behavior.sleep	1	2	0	2
minecraft:behavior.snacking	1	2	1	1
minecraft:behavior.sneeze	1	2	0	2
minecraft:behavior.sniff	1	1	1	0
minecraft:behavior.sonic_boom	1	1	1	0
minecraft:behavior.stalk_and_pounce_on_target	1	1	1	0
minecraft:behavior.stay_near_noteblock	1	1	1	0
minecraft:behavior.stomp_attack	1	1	0	1
minecraft:behavior.stroll_towards_village	1	1	0	1
minecraft:behavior.summon_entity	1	1	1	0
minecraft:behavior.swell	1	1	1	0
minecraft:behavior.swim_up_for_breath	1	1	1	0
minecraft:behavior.swim_with_entity	1	1	1	0
minecraft:behavior.swoop_attack	1	1	1	0
minecraft:behavior.take_block	1	1	1	0
minecraft:behavior.target_when_pushed	1	1	1	0
minecraft:behavior.timer_flag_2	1	1	0	1
minecraft:behavior.timer_flag_3	1	1	0	1
minecraft:behavior.transport_items	1	1	1	0
minecraft:behavior.wither_random_attack_pos_goal	1	1	1	0
minecraft:behavior.wither_target_highest_damage	1	1	1	0
minecraft:behavior.work	1	4	0	4
minecraft:behavior.work_composter	1	2	0	2

(c) Triggers (10)

Trigger	Entities	Instances
minecraft:on_target_acquired	22	28
minecraft:on_target_escape	10	13
minecraft:on_friendly_anger	3	3
minecraft:on_hurt	3	5
minecraft:on_hurt_by_player	2	4
minecraft:on_death	1	1
minecraft:on_equipment_changed	1	1
minecraft:on_start_landing	1	1
minecraft:on_start_takeoff	1	1
minecraft:on_wake_with_owner	1	1

Parameters vanilla sets on the 30 most used non-goal components

Format: parameter (instances; most common values with counts). dict[n] and list[n] are objects and arrays with n members.

• minecraft:physics [126]: has_gravity (9; false x9); has_collision (4; false x4); push_towards_closest_space (1; true x1)
• minecraft:collision_box [125]: width (110; 0.6 x42, 0.98 x15, 1.4 x12); height (76; 1.9 x27, 0.25 x10, 0.7 x9)
• minecraft:type_family [124]: family (195; list[2] x59, list[3] x45, list[4] x43)
• minecraft:conditional_bandwidth_optimization [117]: default_values (32; dict[3] x32); conditional_values (7; list[1] x7)
• minecraft:health [94]: value (68; 20 x22, 10 x14, 16 x6); max (64; 20 x21, 10 x13, 16 x6)
• minecraft:nameable [94]: allow_name_tag_renaming (4; false x4); always_show (3; true x2, false x1); default_trigger (1; dict[2] x1); name_actions (1; list[1] x1)
• minecraft:movement [93]: value (78; 0.25 x19, 0.3 x16, 0.1 x9); max (2; 1 x1, 0.0 x1)
• minecraft:is_hidden_when_invisible [92]: (empty object)
• minecraft:pushable_by_block [91]: (empty object)
• minecraft:hurt_on_condition [87]: damage_conditions (88; list[1] x86, list[2] x1, list[3] x1)
• minecraft:pushable_by_entity [85]: presets (33; list[1] x30, list[2] x3)
• minecraft:breathable [84]: total_supply (82; 15 x78, 5 x2, 240 x1); suffocate_time (82; 0 x81, -1 x1); breathes_water (36; true x33, false x3); breathes_air (19; true x11, false x8); generates_bubbles (6; false x6); breathes_lava (4; true x2, false x2); suffocateTime (2; 0 x1, -1 x1); totalSupply (2; 15 x1, 0 x1); inhale_time (1; 3.75 x1)
• minecraft:experience_reward [80]: on_death (77; "query.last_hit_by_player ? Math.Random(1,3) : 0" x37, "query.last_hit_by_player ? 5 + (query.equipment_count * Math.Random(1,3)) : 0" x14, "query.last_hit_by_player ? 5 : 0" x9); on_bred (29; "Math.Random(1,7)" x29)
• minecraft:jump.static [79]: jump_power (1; 0.6 x1)
• minecraft:loot [78]: table (23; "loot_tables/entities/zombie.json" x5, "loot_tables/entities/pillager_captain.json" x4, "loot_tables/entities/horse.json" x3)
• minecraft:despawn [76]: despawn_from_distance (73; dict[0] x67, dict[2] x6); filters (3; dict[1] x3); remove_child_entities (1; true x1)
• minecraft:navigation.walk [66]: can_path_over_water (50; true x47, false x3); avoid_water (42; true x41, false x1); avoid_damage_blocks (31; true x30, false x1); using_door_annotation (29; true x29); is_amphibious (15; true x15); can_pass_doors (13; true x13); can_open_doors (10; true x9, false x1); avoid_sun (9; true x7, false x2); can_path_over_lava (6; true x5, false x1); can_break_doors (5; true x5); can_sink (4; false x4); blocks_to_avoid (2; list[1] x2); can_float (2; true x2); avoid_portals (2; false x1, true x1); can_walk (2; true x2); can_walk_in_lava (1; true x1)
• minecraft:movement.basic [65]: max_turn (1; 180.0 x1)
• minecraft:can_climb [57]: (empty object)
• minecraft:attack [48]: damage (51; 3 x17, 2 x16, 5 x4); effect_name (8; "poison" x5, "hunger" x1, "slowness" x1); effect_duration (8; 10 x3, 18 x1, 0 x1)
• minecraft:scale [48]: value (49; 0.5 x34, 0.4 x3, 1 x3)
• minecraft:is_baby [44]: (empty object)
• minecraft:leashable [43]: presets (14; list[1] x11, list[2] x3); unleash_on_removal (9; false x9); on_unleash (8; dict[2] x8); on_leash (4; dict[2] x4)
• minecraft:offspring [43]: offspring_pairs (43; dict[1] x40, dict[2] x3); mutation_factor (5; dict[1] x4, dict[2] x1); inherit_tamed (5; false x5); combine_parent_colors (3; true x3); property_inheritance (3; dict[1] x3); parent_centric_attribute_blending (3; list[1] x2, list[3] x1); blend_attributes (2; false x2); mutation_strategy (1; "random" x1); random_variant_mutation_interval (1; list[2] x1); random_extra_variant_mutation_interval (1; list[2] x1); deny_parents_variant (1; dict[3] x1)
• minecraft:spawn_egg_interaction [43]: (empty object)
• minecraft:leashable_to [42]: unleash_on_removal (8; false x8)
• minecraft:damage_sensor [40]: triggers (42; dict[2] x20, dict[3] x8, list[2] x7)
• minecraft:balloonable [39]: mass (14; 0.5 x5, 0.6 x2, 0.4 x2)
• minecraft:rideable [36]: seats (67; dict[1] x50, dict[2] x6, list[3] x4); seat_count (67; 1 x59, 2 x6, 4 x1); family_types (59; list[1] x50, list[3] x5, list[2] x4); interact_text (30; "action.interact.ride.horse" x14, "action.interact.ride.boat" x6, "action.interact.mount" x6); crouching_skip_interact (12; true x12); pull_in_entities (10; true x10); passenger_max_width (6; 1.375 x6); on_rider_enter_event (4; "minecraft:on_passenger_mount" x1, "minecraft:on_mount" x1, "minecraft:on_player_mount" x1); on_rider_exit_event (4; "minecraft:on_passenger_dismount" x1, "minecraft:on_dismount" x1, "minecraft:on_player_dismount" x1); dismount_mode (2; "on_top_center" x2)
• minecraft:ageable [35]: duration (35; 1200 x34, 2400 x1); grow_up (35; dict[2] x35); pause_growth_items (33; list[1] x33); reset_growth_items (33; list[1] x33); feed_items (26; list[1] x8, list[2] x6, "wheat" x4); interact_filters (1; dict[3] x1); drop_items (1; list[1] x1)

Observations: minecraft:health and minecraft:movement are one number each; minecraft:navigation.walk is 16 booleans; minecraft:breathable still carries the camelCase suffocateTime and totalSupply in two files, so a reader must accept both spellings; minecraft:despawn is almost always {"despawn_from_distance": {}}, that is, the engine defaults; minecraft:rideable.seats is a single object in 50 instances and an array in 17; minecraft:interact.interactions and environment_sensor.triggers and damage_sensor.triggers are each a single object or an array.

Parameters vanilla sets on the 30 most used goals

• minecraft:behavior.look_at_player [69]: priority (64; 7 x21, 8 x19, 9 x8); look_distance (52; 6.0 x24, 6 x21, 16 x2); probability (30; 0.02 x25, 0.01 x2, 1 x2); look_time (21; dict[2] x21); angle_of_view_horizontal (1; 45 x1)
• minecraft:behavior.random_stroll [64]: priority (62; 6 x24, 7 x14, 9 x7); speed_multiplier (59; 1 x19, 0.8 x10, 1.0 x9); xz_dist (3; 3 x1, 16 x1, 2 x1); interval (2; 100 x2); y_dist (1; 1 x1)
• minecraft:behavior.random_look_around [55]: priority (53; 8 x19, 9 x17, 7 x6); look_distance (1; 8 x1)
• minecraft:behavior.float [49]: priority (49; 0 x40, 1 x6, 7 x1); chance_per_tick_to_float (6; 0.0 x4, 1.0 x1, 1 x1); time_under_water_to_dismount_passengers (6; 2.0 x5, 2 x1)
• minecraft:behavior.nearest_attackable_target [49]: priority (55; 2 x25, 1 x9, 3 x8); entity_types (55; list[1] x31, list[2] x12, list[3] x10); must_see (46; true x43, false x3); within_radius (19; 16 x5, 16.0 x4, 12 x3); reselect_targets (18; true x18); attack_interval (12; dict[2] x8, dict[1] x4); must_see_forget_duration (8; 17 x3, 17.0 x2, 40 x2); must_reach (3; true x3); persist_time (2; 0.5 x1, 0.0 x1); target_acquisition_probability (2; 0.5 x2); scan_interval (1; 20 x1); target_search_height (1; 80 x1)
• minecraft:behavior.hurt_by_target [42]: priority (43; 1 x31, 2 x9, 3 x2); entity_types (17; list[1] x9, dict[2] x4, dict[1] x4); hurt_owner (2; true x2)
• minecraft:behavior.panic [37]: priority (43; 1 x32, 2 x4, 3 x4); speed_multiplier (39; 1.25 x17, 1.2 x6, 2.0 x5); ignore_mob_damage (4; true x4); damage_sources (3; list[9] x3); force (2; true x2); panic_sound (1; "panic" x1); sound_interval (1; dict[2] x1); prefer_water (1; true x1)
• minecraft:behavior.melee_box_attack [32]: priority (35; 4 x15, 3 x7, 2 x6); track_target (22; true x22); speed_multiplier (12; 1.25 x5, 1 x2, 1.4 x1); can_spread_on_fire (5; true x5); cooldown_time (3; 2 x2, 0.75 x1); require_complete_path (3; true x3); on_attack (2; dict[1] x1, dict[2] x1); attack_once (2; true x2); random_stop_interval (1; 100 x1); melee_fov (1; 360 x1)
• minecraft:behavior.tempt [31]: priority (37; 4 x13, 5 x12, 3 x7); items (37; list[1] x19, list[2] x8, list[3] x4); speed_multiplier (33; 1.25 x10, 1.2 x8, 0.5 x5); can_tempt_vertically (9; true x9); within_radius (9; 16 x6, 8 x3); on_tempt_end (8; dict[1] x8); can_get_scared (3; true x3); tempt_sound (2; "tempt" x2); sound_interval (2; list[2] x1, dict[2] x1); on_tempt_start (2; dict[1] x2); can_tempt_while_ridden (1; true x1)
• minecraft:behavior.avoid_mob_type [28]: entity_types (28; list[1] x25, list[3] x2, list[2] x1); priority (27; 4 x6, 1 x6, 2 x5); max_dist (3; 16 x2, 6 x1); probability_per_strength (2; 0.14 x2); remove_target (2; true x2); avoid_mob_sound (2; "retreat" x2); sound_interval (2; dict[2] x2); max_flee (1; 20 x1); ignore_visibility (1; true x1); on_escape_event (1; dict[2] x1)
• minecraft:behavior.breed [26]: priority (29; 3 x15, 2 x7, 4 x6); speed_multiplier (28; 1.0 x25, 0.6 x2, 0.75 x1)
• minecraft:behavior.mount_pathing [26]: priority (27; 2 x13, 1 x6, 5 x6); target_dist (27; 0.0 x16, 0 x9, 4.0 x1); speed_multiplier (27; 1.25 x14, 1.5 x11, 4 x1); track_target (27; true x27)
• minecraft:behavior.follow_parent [24]: priority (27; 5 x9, 6 x8, 4 x7); speed_multiplier (27; 1.1 x15, 1.0 x7, 1.25 x2)
• minecraft:behavior.pickup_items [20]: goal_radius (20; 2 x19, 2.2 x1); max_dist (20; 3 x17, 32 x1, 10 x1); priority (19; 6 x5, 5 x4, 7 x4); speed_multiplier (19; 1 x8, 1.0 x6, 0.5 x3); pickup_based_on_chance (13; true x10, false x3); can_pickup_any_item (12; true x10, false x2); excluded_items (9; list[1] x8, list[2] x1); can_pickup_to_hand_or_equipment (3; false x3); search_height (1; 32 x1); pickup_same_items_as_in_hand (1; true x1); cooldown_after_being_attacked (1; 20 x1); on_pickup_item_start (1; dict[1] x1); on_pickup_item_end (1; dict[1] x1); stop_if_holding_item (1; true x1)
• minecraft:behavior.equip_item [17]: priority (17; 3 x11, 2 x4, 4 x1)
• minecraft:behavior.ranged_attack [14]: priority (22; 0 x8, 2 x6, 1 x4); attack_radius (14; 64 x6, 15.0 x4, 8 x2); attack_interval (13; dict[2] x9, 3.5 x2, 2.5 x2); attack_range (9; dict[2] x9); charge_shoot_trigger (7; 2 x6, 4.0 x1); charge_charged_trigger (6; 1 x6); attack_interval_min (4; 1 x3, 3 x1); attack_interval_max (4; 1 x2, 3 x2); speed_multiplier (3; 1.0 x1, 1.25 x1, 1 x1); burst_interval (1; 0.3 x1); burst_shots (1; 3 x1); swing (1; true x1); attack_radius_min (1; 4 x1); target_in_sight_time (1; 0.1 x1)
• minecraft:behavior.random_swim [12]: priority (12; 3 x4, 7 x3, 8 x1); interval (11; 0 x9, 80 x1, 100 x1); xz_dist (9; 16 x6, 30 x2, 20 x1); y_dist (8; 4 x6, 15 x2); speed_multiplier (8; 1 x4, 1.5 x2, 0.5 x1); avoid_surface (2; false x2)
• minecraft:behavior.player_ride_tamed [10]: priority (4; 1 x2, 0 x2)
• minecraft:behavior.find_mount [8]: priority (8; 1 x6, 0 x1, 4 x1); within_radius (8; 16 x8); start_delay (5; 15 x4, 100 x1); max_failed_attempts (4; 20 x4); avoid_water (1; true x1); mount_distance (1; 2.0 x1); target_needed (1; false x1)
• minecraft:behavior.flee_sun [7]: priority (7; 2 x4, 4 x2, 3 x1); speed_multiplier (7; 1 x7)
• minecraft:behavior.run_around_like_crazy [6]: priority (6; 1 x6); speed_multiplier (6; 1.2 x6)
• minecraft:behavior.stomp_turtle_egg [6]: goal_radius (6; 1.14 x6); priority (6; 4 x3, 5 x2, 6 x1); search_height (6; 2 x6); interval (6; 20 x6); search_range (6; 10 x6); speed_multiplier (6; 1 x6)
• minecraft:behavior.swim_idle [6]: priority (6; 5 x3, 7 x1, 8 x1); idle_time (2; 5.0 x1, 5 x1); success_rate (2; 0.05 x1, 0.1 x1)
• minecraft:behavior.swim_wander [6]: interval (6; 0.1 x2, 10 x2, 1 x1); priority (6; 4 x3, 5 x2, 7 x1); look_ahead (5; 2 x4, 2.0 x1); speed_multiplier (3; 1.5 x2, 0.014 x1); wander_time (1; 5.0 x1)
• minecraft:behavior.celebrate [5]: celebration_sound (5; "celebrate" x5); duration (5; 30 x4, 30.0 x1); jump_interval (5; dict[2] x5); on_celebration_end_event (5; dict[2] x5); priority (5; 5 x5); sound_interval (5; dict[2] x5)
• minecraft:behavior.follow_owner [5]: priority (5; 6 x2, 4 x2, 3 x1); speed_multiplier (5; 1.0 x4, 8 x1); start_distance (5; 10 x3, 16 x1, 5 x1); stop_distance (5; 2 x3, 4 x1, 1 x1); ignore_vibration (3; true x2, false x1); post_teleport_distance (2; -1 x2); can_teleport (1; false x1)
• minecraft:behavior.leap_at_target [5]: priority (6; 4 x4, 3 x2); yd (4; 0.4 x4); must_be_on_ground (3; false x3); target_dist (1; 0.3 x1)
• minecraft:behavior.move_to_village [5]: priority (5; 5 x2, 6 x1, 4 x1); speed_multiplier (5; 1 x2, 0.7 x1, 1.0 x1); goal_radius (4; 2 x3, 2.0 x1)
• minecraft:behavior.use_kinetic_weapon [5]: approach_distance (7; 10 x4, 12 x2, 10.0 x1); reposition_distance (7; dict[2] x7); cooldown_distance (7; dict[2] x7); weapon_reach_multiplier (7; 0.5 x7); weapon_min_speed_multiplier (7; 0.2 x7); hijack_mount_navigation (7; true x7); track_target (7; true x7); priority (7; 3 x4, 8 x1, 4 x1); cooldown_speed_multiplier (3; 4 x1, 1.4 x1, 1.5 x1); speed_multiplier (3; 4 x1, 1.4 x1, 1.5 x1); reposition_speed_multiplier (2; 4 x1, 1.4 x1)
• minecraft:behavior.look_at_entity [4]: priority (4; 10 x2, 2 x1, 9 x1); look_time (3; dict[2] x3); look_distance (3; 6 x2, 8 x1); angle_of_view_horizontal (2; 170 x1, 45 x1); angle_of_view_vertical (1; 135 x1); probability (1; 1 x1); filters (1; dict[3] x1)

Observations: every goal has priority; speed_multiplier is the second most common field; nearest_attackable_target, hurt_by_target, avoid_mob_type and the other targeting goals take entity_types[] { filters, max_dist, must_see, must_see_forget_duration, sprint_speed_multiplier, walk_speed_multiplier, cooldown } (Definitions/NestedTables/entity_types.md); attack_interval is both a number and a {min, max} object; the docs' nearest_attackable_target page lists 20 parameters of which vanilla sets 12.

3. Filters

Grammar

Filter Group.json (client_server/common/1.21.20): a filter is one Filter Test, an array of filter groups, or a Filter Group Map with keys all_of, any_of, none_of and the aliases all, AND, any, OR, NOT, each holding a filter group; groups nest without limit. Filter Test.json: test (required string), subject, operator, domain, value, each of the last four typed as boolean, integer, number or string. FilterSubject.json (1.21.120): self, other, player, target, parent, baby, block, damager, holder, item, backed by int16, which is why the 1.26 serializer writes "subject": 1 for other and 0 for self. Operators per Definitions/NestedTables/operator.md: !=, <, <=, <>, =, ==, >, >=, equals, not; vanilla also writes 0 for == and 1 for != (checked against the vindicator: has_component ... operator 1 value minecraft:is_baby where the text form is !=). Defaults per Documents/EntityEvents.md: subject self, operator ==; value is required except for bool_property (assumes true) and has_property (assumes ==), per IntroductionToEntityProperties.md. domain is "only used by a few tests to provide additional context, such as the inventory slot to test in for the has_equipment test"; in vanilla it holds equipment slots (hand 130, main_hand 37, inventory 36, armor 3, head 3, torso, leg, feet 1 each), property names (minecraft:sulfur_cube_archetype 36, minecraft:armadillo_state 19, minecraft:creaking_state 13 and 14 others) and game rule names for is_game_rule (tntexplodes 8, domobspawning 1). Values are strings 1208 times, booleans 353, integers 221, floats 7, and absent 108 times.

Where filters live: component bodies 655 instances (entity_types[].filters, environment_sensor.triggers[].filters, damage_sensor, interact.on_interact.filters, despawn.filters, spawn_entity.filters, look_at_entity.filters), component groups 801, event nodes 441. Combinators: all_of 361, any_of 131, none_of 9, AND 50, OR 21, NOT/all/any 0; the deepest nesting is 4. The 27 files with the integer encoding and AND/OR are blaze, breeze, cod, creeper, elder_guardian, endermite, evocation_illager, ghast, guardian, iron_golem, magma_cube, phantom, piglin_brute, pillager, pufferfish, salmon, shulker, silverfish, slime, tropicalfish, vex, villager, vindicator, wandering_trader, wither, wither_skeleton, zombie_villager (18 of the 34 1.26.0 files, 8 of the 56 1.26.50 files, 1 1.26.20 file).

Spawn rules use the same grammar in minecraft:biome_filter (has_biome_tag 185, is_snow_covered 1) and trade tables in TradeItem.filters (in_overworld and is_mark_variant with operator: "=", cartographer and fisherman economy tables). in_overworld is used nowhere else, so the runtime needs 87 tests for vanilla: the 86 below plus in_overworld. The 21 documented tests no vanilla file uses: any_slot_empty, clock_time, float_property, has_equipment_block_tag, has_item_with_component, has_property, has_tag, in_clouds, is_altitude, is_climbing, is_humid, is_immobile, is_in_same_vehicle, is_target, is_temperature_type, is_weather (marked DEPRECATED), light_level, moon_intensity, moon_phase, on_ladder, surface_mob.

Tests used in vanilla entity files

"Operators seen" and "Subjects seen" use the literal spellings, with default for an absent key.

Test	Instances	Entities	Operators seen	Subjects seen
is_family	526	86	default 384, != 30, 0 86, == 5, not 17, 1 4	other 421, self 3, default 6, 1 90, damager 1, target 5
has_equipment	160	35	not 20, default 140	other 130, self 28, default 2
has_biome_tag	141	12	default 116, != 14, not 11	default 141
has_component	108	37	default 22, not 13, != 65, 1 4, == 3, equals 1	default 58, self 22, 1 4, other 20, target 4
in_lava	91	86	default 37, == 54	self 74, default 15, other 2
enum_property	83	26	default 55, not 28	default 45, other 35, self 3
hourly_clock_time	70	3	> 1, <= 1, >= 34, < 34	default 70
has_equipment_tag	50	6	default 46, not 4	other 26, self 6, player 4, default 14
in_water	49	26	default 27, == 7, != 13, 1 2	default 24, other 19, self 4, 1 2
is_sneak_held	42	15	default 42	other 42
is_difficulty	42	11	default 25, != 14, 1 3	default 39, 0 3
rider_count	35	13	equals 23, default 4, > 5, == 3	self 33, default 2
bool_property	32	9	!= 7, default 24, == 1	default 32
is_controlling_passenger_family	30	18	default 30	self 18, other 12
is_daytime	27	10	default 26, 0 1	default 26, 0 1
is_variant	26	6	!= 2, == 24	default 2, self 22, other 2
is_mark_variant	25	3	!= 13, default 12	self 13, other 12
is_underwater	23	10	== 7, default 15, != 1	self 8, other 2, default 13
has_ability	19	3	not 3, default 16	other 19
has_ranged_weapon	18	4	== 8, default 10	self 8, default 10
is_riding	16	6	default 8, == 3, != 1, equals 4	default 7, other 2, self 7
is_vehicle_family	14	3	not 8, default 6	other 2, default 12
actor_health	13	4	> 8, default 3, <= 1, >= 1	self 5, other 3, target 3, default 2
on_ground	12	8	default 8, == 4	default 9, self 3
is_skin_id	12	2	default 12	other 12
has_nametag	11	6	default 11	default 11
has_target	10	7	default 8, == 2	self 3, default 5, other 2
is_underground	10	4	default 9, == 1	default 9, self 1
y_rotation	10	1	>= 5, < 5	default 10
is_game_rule	9	3	default 6, == 3	default 9
is_panicking	7	5	default 7	default 7
is_block	7	2	default 4, != 2, == 1	block 7
is_moving	7	7	default 3, == 4	self 7
is_baby	7	4	default 6, == 1	default 5, other 2
is_sneaking	7	3	default 5, != 1, == 1	other 7
distance_to_nearest_player	7	4	> 6, <= 1	default 7
has_mob_effect	7	2	default 7	self 4, other 3
target_distance	6	3	<= 2, > 2, >= 2	self 4, default 2
is_snow_covered	6	4	default 6	default 6
in_nether	6	3	== 4, default 2	self 4, default 2
on_fire	5	3	default 5	default 3, damager 1, self 1
is_leashed	5	2	default 5	default 3, self 2
is_sitting	5	3	default 5	self 5
owner_distance	5	4	> 5	default 5
is_sleeping	5	4	default 5	default 5
weather_at_position	5	1	!= 3, default 2	default 4, self 1
in_block	5	1	default 4, not 1	self 4, default 1
is_owner	4	2	default 4	other 4
all_slots_empty	4	2	not 3, default 1	other 2, self 1, default 1
in_contact_with_water	4	4	default 3, == 1	default 4
is_tamed	4	2	default 4	default 4
is_brightness	4	2	> 2, < 2	default 4
is_persistent	4	2	default 4	default 4
is_raider	4	1	default 4	other 3, self 1
int_property	3	1	> 2, <= 1	default 3
is_biome	3	2	default 3	default 3
random_chance	3	3	default 3	default 3
is_visible	3	1	0 1, default 2	0 1, self 2
is_avoiding_mobs	3	1	0 1, default 2	0 1, self 2
was_last_hurt_by	2	1	default 2	other 2
is_sprinting	2	1	default 2	other 2
in_water_or_rain	2	2	!= 2	default 2
weather	2	1	== 2	default 2
trusts	2	1	!= 1, == 1	other 2
is_missing_health	2	2	default 2	default 1, self 1
in_caravan	2	2	default 2	default 2
is_riding_self	2	2	default 2	other 2
inactivity_timer	2	2	default 2	self 2
is_temperature_value	2	1	> 1, < 1	default 2
has_damage	2	2	default 2	default 2
has_silk_touch	1	1	default 1	other 1
is_waterlogged	1	1	== 1	block 1
is_navigating	1	1	default 1	default 1
home_distance	1	1	> 1	default 1
is_bound_to_creaking_heart	1	1	default 1	default 1
is_color	1	1	default 1	other 1
has_container_open	1	1	default 1	other 1
is_in_village	1	1	default 1	self 1
redstone_strength_at_position	1	1	> 1	default 1
has_same_equipment_in_slot_as	1	1	default 1	other 1
actor_has_item_with_enchantment_in_slot	1	1	not 1	other 1
has_trade_supply	1	1	default 1	self 1
is_leashed_to	1	1	default 1	other 1
on_hot_block	1	1	default 1	self 1
taking_fire_damage	1	1	default 1	self 1
has_damaged_equipment	1	1	default 1	self 1

4. Spawn rules

Grammar

Spawn Rules.json (server/spawn/1.21.50): description {identifier (required), population_control} and conditions[], each condition a Spawn BiomeConditions object with these keys (the schema's full list; defaults from the schema, descriptions from the docs pages under Definitions/NestedTables/):

Component	Schema body	Vanilla files	Instances	Vanilla values
minecraft:weight	default (required int), rarity (int, 0)	54	99	default 10 x14, 8 x14, 1 x9, 5 x9, 100 x8; rarity 2 x2, 3 x1
minecraft:biome_filter	filter group	54	101	has_biome_tag 185 (== 61, != 7, not 1), is_snow_covered 1; all_of 24, any_of 16, none_of 1; 21 instances are bare arrays
minecraft:herd	min_size 1, max_size 1, initial_event, initial_event_count 0, event, event_skip_count 0; object or array	49	94	min 3 x71, 2 x51, 1 x32, 4 x14, 8 x1; max 5 x76, 4 x30, 2 x18, 6 x18; event 6 minecraft:entity_born plus tropicalfish color events; initial_event minecraft:promote_to_patrol_captain and minecraft:as_rider
minecraft:spawns_on_surface	empty object	45	84
minecraft:brightness_filter	min 0, max 15 (0 to 15), adjust_for_weather false	38	73	min 7 x42, 0 x30, 9 x1; max 15 x43, 7 x27, 11 x2, 4 x1; adjust_for_weather true 27
minecraft:difficulty_filter	min peaceful, max hard; enum peaceful, easy, normal, hard	25	41	min easy 31, peaceful 7; max hard 38
minecraft:spawns_on_block_filter	string or array of block descriptors	21	41	string 25, array 16 (grass_block 26, coarse_dirt, sand, red_sand, clay, ice, terracottas)
minecraft:spawns_underground	empty object	21	31
minecraft:density_limit	surface -1, underground -1	14	26	surface 5 x9, 20 x4, 3 x3, 2 x2, 4 x2; underground 5, 20, 0, 2
minecraft:spawns_underwater	empty object	11	22
minecraft:height_filter	min 24, max 128 (schema defaults)	9	14	min 0 x7, 38, 50, 60, -64; max 64 x9, 58, 30, 66, 67
minecraft:distance_filter	min 24, max 128	5	13	min 12 x10, 24 x3; max 32 x10, 48 x3
minecraft:spawns_on_block_prevented_filter	string or array	5	9	arrays of 2
minecraft:permute_type	array of {weight (required), entity_type, min_guaranteed}; docs call the third guaranteed_count	2	5	zombie 95/5 minecraft:zombie_villager_v2; pillager_patrol 100 minecraft:pillager<minecraft:spawn_as_patrol_follower>
minecraft:disallow_spawns_in_bubble	empty object	1	1	axolotl
minecraft:delay_filter	min 0, max 0, identifier, spawn_chance 100	1	3	pillager_patrol: 600 to 660, chance 20, per difficulty identifier
minecraft:player_in_village_filter	distance (required), village_border_tolerance 10	1	3	48, 32
minecraft:world_age_filter	min 0, max -1	1	3	min 6000
minecraft:mob_event_filter	event (minecraft:pillager_patrols_event, minecraft:wandering_trader_event, minecraft:ender_dragon_event)	1	3	pillager_patrol
minecraft:spawn_event	event	1	2	stray change_to_skeleton
minecraft:spawns_lava	empty object	1	1	strider
minecraft:spawns_above_block_filter	blocks, distance 1	0	0	schema only; absent from the docs list
minecraft:is_persistent	empty object	0	0	schema only
minecraft:is_experimental	empty object	0	0	schema only

There is no is_baby or spawn_category key in the spawn rule schema; baby spawns come from the entity's own spawn event, and spawn_category is an entity description field. format_version is 1.8.0 in 58 files, 1.11.0 and 1.17.0 once each. The identifier must match the entity (DataDrivenSpawning.md); minecraft:pillager_patrol is the one rule without an entity of that name, and 59 of the 129 entities have a rule. Files with 1 condition 30, 2 conditions 17, 3 conditions 4, 4 (drowned, enderman) 2, 5 (rabbit, tropicalfish) 2, 9 (wolf, one per coat biome) 1. Four files (blaze, cat, pillager, wither_skeleton) have a description and no conditions, which registers the pool and leaves placement to engine code (fortress spawns, village cats, patrols).

Population pools and what the docs say about the algorithm

population_control values in vanilla: animal 27, monster 24, water_animal 5, pillager 2 (pillager, pillager_patrol), cat 1, ambient 1 (bat). DataDrivenSpawning.md: "There are four pools that entities can be assigned to (animal, water_animal, monster, and cat), and each has its own spawn limit. By assigning an entity to a pool, it will spawn as long as that pool hasn't reached the spawn limit." Then: "The 'cat' pool functions differently than the other 3 population pools. Cat spawn rules and limits are based upon the amount within a village." and "There are 2 more pools located within the game files, Villager and Pillager. However, these are not currently used by any entities." The generated Entities.html still says "There are 3 pools"; neither mentions ambient, which bat uses. EntitySpawningDeepDive.md gives "Typical Cap" values hedged with tildes: animal "~10 per player", monster "~70 in loaded chunks", water_animal "~5 per water body", water_ambient "~20 per water body", ambient "~15 in caves", pillager "Limited by patrols"; it lists water_ambient as a type although no vanilla rule uses it. The same page: "Higher weight = more common. Total weights in a biome determine relative spawn rates. A weight of 100 in a biome with total weight 1000 = 10% chance." density_limit "allows players to specify the amount of mobs to spawn in certain locations" with separate surface and underground caps; spawns_on_surface and spawns_underground select the pass; brightness_filter is "the light level range that causes the mob to spawn", with adjust_for_weather "Allowing hostile mobs to spawn during the day when it rains"; distance_filter defaults to 24 to 128 blocks from the player. The spawn cycle diagram names six steps: "check spawn conditions, find valid spawn locations, check population caps, evaluate spawn weight, spawn entity, and run spawn event".

Undocumented: the number of spawn attempts per chunk per tick, how a chunk or player is chosen, the actual cap numbers and whether they scale with players or loaded chunks, how "surface" versus "underground" is decided for a position, which light value (block, sky, or combined) brightness_filter compares, how rarity in minecraft:weight works, how herd members are placed around the first spawn, and the despawn policy beyond the minecraft:despawn component fields in section 1. Nothing in the docs or the samples states these.

5. Loot tables

Grammar

No JSON schema for loot tables exists in bedrock-samples (json_schemas/ has only AppendLoot.json, a worldgen processor). The grammar comes from Reference/Content/LootTableReference/Examples/LootTableComponents/*.md and Documents/IntroductionToLootTables.md, LootAndTradeTableFunctions.md, LootTableConditions.md:

• Table: { "pools": [...] }. Six village chest tables also carry "type": "minecraft:chest", which no docs page mentions.
• Pool: rolls (integer, default 1, or {min, max}), bonus_rolls ("Additional rolls added based on luck attribute. Can be fixed or range", default 0), conditions[], entries[], tiers { initial_range, bonus_rolls, bonus_chance } ("Tiered entry selection configuration"; the docs give no further semantics).
• Entry: type (item, loot_table, empty), name (item id or table path), weight (default 1), quality, functions[], conditions[], pools[] ("Nested pools for type 'loot_table'. Allows inline loot table definition"). quality is listed in vanilla but has no docs text at all.
• Condition: {condition, ...} with per-condition fields chance, looting_multiplier, default_chance/peaceful/easy/normal/hard, max_chance, value, entity_type, entity (this, attacker, attacking_player) plus properties {on_fire, on_ground}, match_tool {item, count, durability, enchantments[] {enchantment, levels {range_min, range_max}}, minecraft:match_tool_filter_any|all|none}, tag and operator (used by biome_has_tag in vanilla, undocumented). Conditions attach to pools, entries and functions; "each condition runs one at a time. If any one condition in the list fails, the remaining conditions in the list will be ignored" (LootTableConditions.md).
• Function: {function, ...}. Documented functions and their parameters (LootAndTradeTableFunctions.md and the loot_function.md table): set_count {count}, set_damage {damage} (fraction of durability remaining), set_data {data}, set_data_from_color_index, set_actor_id {id}, set_banner_details {type, base_color, patterns[] {color, pattern}}, set_book_contents {author, title, pages}, set_lore {lore[]}, set_name {name}, set_potion {id}, set_stew_effect {effects[] {id}}, set_ominous_bottle_amplifier {amplifier}, set_armor_trim {material, pattern}, looting_enchant {count} ("loot table only ... only works with loot tables that are called by the death of an entity"), random_aux_value {values}, random_block_state, random_dye, enchant_randomly {treasure}, enchant_with_levels {levels, treasure}, enchant_random_gear {chance}, enchant_book_for_trading {base_cost, base_random_cost, per_level_random_cost, per_level_cost} ("trade table only"), specific_enchants {enchants[]}, explosion_decay ("a flat chance (equal to 1/explosion radius) for each dropped item to be destroyed"), exploration_map {destination} (12 destinations listed), fill_container {loot_table}, furnace_smelt ("loot table only ... will not work in villager trades or with chests"), trader_material_type. The loot_function.md table also names set_nbt. "Max enchantment levels are hard-coded and can't be overwritten." "A loot table cannot refer to itself in any way. If a roll results in a recursive loot table, nothing will be returned" (CreateLootTable.md).

Vanilla usage

309 tables: entities 122, blocks 99, chests 61, gameplay 9, equipment 7, spawners 5, dispensers 3, barrels 1, pots 1, empty.json 1. 299 have pools; 10 are {} or {"pools": []} (empty.json, goat, ocelot, wolf, bat, giant, endermite, silverfish, clownfish, empty_brushable_block). 468 pools and 1459 entries. rolls is an integer 390 times, a {min, max} range 71 times and absent 7 times; bonus_rolls appears on 11 pools, always 0; tiers on 5 pools (zombie_equipment, zombie_rider_equipment, skeleton_gear, piglin_gear_melee, piglin_gear_ranged), with initial_range on all 5 and bonus_rolls and bonus_chance on 3. Entries: item 1379, loot_table 53, empty 27; weight on 1217, functions on 903, quality on 6 (the two fishing tables), conditions on 9 (two chest tables), inline pools on 6 (the armor_set_* tables), and a bare count key on 26 entries in 4 tables (abandoned_camp_barrel, two abandoned camp chests, snow_golem_shear), which no docs page defines. Conditions: 100 on pools, 9 on entries, 15 on functions. All 1140 function instances are on entries. Twenty-six distinct nested table names; one, loot_tables/gameplay/fishing/fish (no .json) in a fishing table, does not resolve.

Function	Instances	Tables	Parameters vanilla sets
set_count	590	154	count range 468, integer 122 (1, 2, 1.0); add: false 56 (undocumented)
looting_enchant	104	67	count range 104; limit 3 (undocumented)
explosion_decay	96	96	none
minecraft:set_count	66	11	count range 65, 10.0 once
enchant_randomly	43	16	treasure: true once
set_potion	35	11	id (poison, swiftness, slowness, regeneration, ...)
enchant_with_levels	35	10	levels range 27 or 30; treasure: true 35
enchant_random_gear	29	18	chance 0.25 x15, 0.5 x8, 0.1 x6
set_data	27	14	data integer
set_damage	27	10	damage range; add: false once
exploration_map	18	5	destination buriedtreasure 3 and 15 abandoned_camp_* biome variants not in the documented list
specific_enchants	15	8	enchants list of 1 or 3
furnace_smelt	15	14	conditions: [entity_properties this on_fire] on every instance
minecraft:set_damage	11	4	damage range
minecraft:set_data_from_color_index	6	5	none
set_armor_trim	6	3	material: copper, pattern flow or bolt
enchant_book_for_trading	5	2	enchantments list (undocumented parameter; the documented four cost fields appear only in trade tables)
set_ominous_bottle_amplifier	3	3	amplifier range
minecraft:set_potion	3	3	id
random_aux_value	2	2	values range
set_banner_details	2	2	type: 1
minecraft:set_stew_effect	1	1	effects list of 2
minecraft:enchant_randomly	1	1	none

Documented functions with no vanilla loot use: set_actor_id, set_book_contents, set_lore, set_name, set_nbt, random_block_state, random_dye (trade only), fill_container, trader_material_type (no file at all). Five functions appear both bare and with the minecraft: prefix, so the reader must strip the namespace.

Condition	Instances	Tables	Parameters vanilla sets
random_chance	16	12	chance 0.5, 0.2, 0.08, 0.25
killed_by_player	15	13	none
random_chance_with_looting	15	15	chance 0.025 x7, 0.25 x5; looting_multiplier 0.01 x12
has_mark_variant	14	1	value -1 to 12 (mooshroom stew)
killed_by_player_or_pets	10	8	none
biome_has_tag	9	2	tag, operator: "!=" 8 (undocumented condition)
random_difficulty_chance	6	6	default_chance, peaceful: 0, easy: 0, hard
random_regional_difficulty_chance	6	5	max_chance 0.15 x5, 0.05
killed_by_entity	5	2	entity_type skeleton, stray, bogged, parched
entity_killed	4	1	entity_type magma_cube, slime (frog table)
has_variant	3	1	value 0, 1, 2
passenger_of_entity	2	2	entity_type: minecraft:chicken (undocumented)
is_baby	2	2	none (undocumented)
bool_property	1	1	domain: minecraft:has_flower, value: true (undocumented as a loot condition)
damaged_by_entity	1	1	entity_type: minecraft:fireball (undocumented)
entity_properties	15	14	only as a function condition on furnace_smelt

match_tool is documented and unused in vanilla.

Contexts and references

• Entity death: minecraft:loot {table} (78 entities, 94 instances because groups swap tables; the zombie's zombie_default, zombie_jockey and zombie_rider groups each set one). Two referenced tables do not exist in the pack: loot_tables/entities/fox.json and loot_tables/entities/piglin.json.
• Equipment at spawn: minecraft:equipment {table, slot_drop_chance[] {slot, drop_chance}} (18 entities, 25 instances) points at loot_tables/entities/*_equipment.json, *_gear.json and armor_set_*.json; the four tiered tables are equipment tables. The equipment/ folder's trial_chamber*.json tables are referenced by the trial spawner data, not by entities, and low_tier_items.json by nothing in the pack.
• Interaction: minecraft:interact.interactions[].add_items {table} and spawn_items {table} (9 entities, 10 instances; sheep shearing, mooshroom milking gameplay/entities/mooshroom_milking.json, sniffer gameplay/entities/sniffer_seeds.json).
• Goals: behavior.sneeze.loot_table (panda, 2), behavior.random_search_and_dig.item_table (sniffer), behavior.drop_item_for (cat gifts), behavior.eat_mob.loot_table (frog), and minecraft:barter.barter_table (piglin).
• Blocks: 98 of the 99 blocks/ tables are the minecraft:loot of a data-driven block file; shelf_mushroom_growth_1.json is referenced by no block.
• Fishing: gameplay/fishing.json and gameplay/jungle_fishing.json are referenced by minecraft:fishing_hook's components in the composed entity file (the only gameplay/ tables an entity names), and they nest gameplay/fishing/{fish,junk,treasure}.json with quality. No goal handles fishing; the hook entity and the rod item are engine code.
• Engine-only: the 54 unreferenced chests/ tables (structure chests), 5 spawners/ (trial spawners), 3 dispensers/, barrels/abandoned_camp_barrel.json, pots/decorated_pot.json, and the 7 entities/*_brushable_block*.json tables for archaeology are named only in structure NBT, worldgen JSON or the binary. Docs: "Loot tables for chests are generated at the time of opening or breaking" (LootAndTradeTableFunctions.md, under fill_container).
• Commands: /loot spawn|replace block|replace entity, /kill and /mine evaluate tables with a tool context (Documents/LootOverloads.md).

6. Trade tables

Grammar

Schemas in client_server/entity/1.21.30/: Trade Table.json is an array of TradeTier; TradeTier { groups[] (required), total_exp_required (required, uint32), trades[] } (the docs add trades directly under a tier, which the 13 legacy vanilla tables use; the schema requires groups); TradeGroup { num_to_select (int, default 0), trades[] (required) }; Trade { wants[] (required), gives[] (required), trader_exp (uint32, default 1), max_uses (int, default 7), reward_exp (bool, default true), weight (int, default 1) }; TradeItemList is a TradeItem or { choice: [TradeItem] }; TradeItem { item (required), quantity (int >= 1 or {min, max}, default 1), functions[], filters (filter group), price_multiplier (float, default 0) }. The docs pages (TradeTableComponents/*.md) give different defaults: max_uses 12, price_multiplier 0.05, num_to_select 1, and describe total_exp_required as "typically 0 ... Higher tiers require more XP (e.g., 10, 70, 150, 250)". Documents/CreateTradeTable.md: "Tiers are unlocked by the trading experience of the villager, not the player. The first tier in a list of trade tiers is always available"; "num_to_select ... the number of trades from the trades array to make available when you trade with a given villager"; "once the trading system hits a tier that requires more experience points than the trader has, subsequent tiers won't be checked"; reward_exp decides "whether the player gets experience"; price_multiplier "sets how much the item's price can increase due to supply and demand changes"; max_uses is "how many times the trade can be made before the trader needs to restock". The vanilla file layout has no format_version in 17 of 27 files; 10 carry one (1.18.10 fisherman, 1.26.10 butcher, cleric, stone_mason economy tables, and six legacy).

The 27 vanilla files

BDS 1.26.51.1 ships them only in the base vanilla layer, 13 in __brarchive/trading.brarchive and 14 in __brarchive/trading/economy_trades.brarchive; the later layers' trading/ folders are empty directories. Nine are \x7fMCB: trading/{butcher,cleric,farmer,fletcher,shepherd,stone_mason}_trades.json and trading/economy_trades/{butcher,cleric,stone_mason}_trades.json. The 18 text files parse to JSON equal to the bedrock-samples files (the two librarian tables contain // comments and trailing commas, so the reader has to be lenient), so the samples stand in for the binary ones. Docs: "the tables in the parent trading/ folder aren't used" (CreateTradeTable.md); vanilla agrees, since only the legacy minecraft:villager references them.

Economy tables (14): every profession table has 5 tiers at total_exp_required 0, 10, 70, 150, 250 with 1 to 3 groups per tier; wandering_trader_trades.json has one tier of 3 groups selecting 2 of 6, 2 of 16 and 5 of 78 trades. Across the 14 files: 282 trades, 130 groups; num_to_select 1 x97, 2 x7, -1 x5 (all of the group), 5 x1, absent 1; max_uses 12 x159, 16 x42, 8 x20, 3 x17, 4 x17, 5 x11, 2 x8, 6 x4, 7 x2, 1 x2; trader_exp absent 102, 30 x34, 15 x32, 10 x31, 5 x28, 1 x21, 2 x19, 20 x15; reward_exp true 152, absent 130; price_multiplier absent 472, 0.05 x163, 0.2 x49; wants has one item 358 times and two 26 times, gives always one; choice lists 206 items (dyes, wools, fish, flowers); quantity integer 509, range 44, absent 241. Legacy tables (13): 46 trades, 25 tiers with trades directly under the tier, and groups in 6 files.

Functions in trade tables (samples, all 27 files): enchant_with_levels 26 instances in 11 files (always treasure: false, levels {min 5, max 19}), random_dye 7 (leather worker), enchant_book_for_trading 7 in 2 files (base_cost 2, base_random_cost 5, per_level_random_cost 10, per_level_cost 3), exploration_map 5 in 2 files (monument, mansion, trial_chambers), random_aux_value 2. trader_material_type, set_banner_details and set_count do not appear in any trade table. filters on items appear 31 times in the cartographer and fisherman economy tables (in_overworld and is_mark_variant on self, selecting biome-specific maps and fish).

How entities reference them and what the engine does

minecraft:economy_trade_table {table, display_name, new_screen, persist_trades, convert_trades_economy, show_trade_screen, cured_discount {min, max} (default -25 to -20), max_cured_discount, nearby_cured_discount (-20), max_nearby_cured_discount (-200), hero_demand_discount (-4), use_legacy_price_formula} (minecraftComponent_economy_trade_table.md). Vanilla villager_v2 sets it in 13 profession groups as {table, display_name, new_screen: true, persist_trades: true, cured_discount: [-25, -20], max_cured_discount: [-25, -20]} (ranges written as two-element arrays, not {min, max}), plus an empty {} in the trade_components group, and minecraft:trade_resupply {} in trade_resupply_component_group, added by the minecraft:resupply_trades event that the villager's minecraft:scheduler fires. wandering_trader sets {table, display_name, new_screen: true}. The legacy minecraft:villager uses minecraft:trade_table {table, display_name, convert_trades_economy: true}, and the docs explain the conversion: "When the trades are converted, the mob will generate a new trade list with their new trade table, but then it will t[ry to keep the same trades]" (minecraftComponent_trade_table.md). The goals around trading are behavior.trade_with_player (3 entities), behavior.trade_interest (2), behavior.look_at_trading_player (3). The docs state the engine effects only as these field names: demand raises prices by price_multiplier per use, max_uses locks a trade until restock, curing applies cured_discount and nearby_cured_discount, Hero of the Village applies hero_demand_discount, trade_resupply "Resupplies an entity's trade", and use_legacy_price_formula switches to "legacy price calculations". The formulas, the restock schedule, the gossip system and how trader_exp maps to villager levels are not written down anywhere public.

7. What this implies for a component runtime

The seven target entities

Union over zombie, villager_v2, creeper, enderman, iron_golem, wolf and cow: 55 goals and 76 non-goal keys (74 components plus on_target_acquired and on_target_escape). Per entity: zombie 12 goals, 35 others, 13 groups, 11 events; villager_v2 27 goals, 38 others, 54 groups, 38 events; creeper 9, 24, 5, 4; enderman 9, 27, 4, 5; iron_golem 12, 28, 2, 2; wolf 17, 42, 18, 25; cow 9, 30, 2, 6. Implementing exactly this union also fully covers husk and mooshroom and 9 non-mob entities (area_effect_cloud, armor_stand, cushion, eye_of_ender_signal, fireworks_rocket, lightning_bolt, ominous_item_spawner, tnt, tripod_camera), 18 entities in all.

Goals in the union: avoid_mob_type, beg, breed, celebrate_survive, defend_village_target, equip_item, explore_outskirts, fertilize_farm_block, find_mount, float, follow_owner, follow_parent, harvest_farm_block, hide, hurt_by_target, inspect_bookshelf, leap_at_target, look_at_player, look_at_trading_player, make_love, melee_attack, melee_box_attack, mingle, mount_pathing, move_indoors, move_outdoors, move_through_village, move_towards_dwelling_restriction, move_towards_target, nearest_attackable_target, offer_flower, owner_hurt_by_target, owner_hurt_target, panic, pickup_items, place_block, play, random_look_around, random_stroll, receive_love, share_items, sleep, stay_while_sitting, stomp_turtle_egg, swell, take_block, take_flower, target_when_pushed, teleport_to_owner, tempt, trade_interest, trade_with_player, use_kinetic_weapon, work, work_composter. Twenty-one of these are villager-only in the union (village, schedule, work and trade goals), so the zombie, creeper, enderman, iron golem, wolf and cow together need 34.

Non-goal keys in the union: ageable, ambient_sound_interval, angry, annotation.break_door, annotation.open_door, apply_knockback_rules, attack, balloonable, breathable, breedable, burns_in_daylight, can_climb, collision_box, color, conditional_bandwidth_optimization, damage_sensor, despawn, dweller, economy_trade_table, environment_sensor, equip_item, equipment, experience_reward, explode, follow_range, healable, health, hide, hurt_on_condition, interact, inventory, is_baby, is_charged, is_dyeable, is_hidden_when_invisible, is_shaking, is_tamed, jump.static, knockback_resistance, leashable, leashable_to, looked_at, loot, mark_variant, movement, movement.basic, nameable, navigation.walk, offspring, on_target_acquired, on_target_escape, persistent, physics, preferred_path, pushable, pushable_by_block, pushable_by_entity, renders_when_invisible, rideable, rotation_locked_to_vehicle, scale, scheduler, shareables, sittable, skin_id, spawn_egg_interaction, tameable, target_nearby_sensor, teleport, timer, trade_resupply, transformation, type_family, uses_legacy_friction, variable_max_auto_step, variant.

Coverage by implementation count

"Covered" means every goal (or every non-goal component and trigger) the entity's base components and all its groups reference is implemented, taking keys in descending order of how many entity files use them (ties by name). 37 of the 129 entities have no goals (projectiles, minecarts, boats, player, tnt, xp_orb and so on), so they count as goal-covered from N = 0.

Goals implemented (top N by use)	Entities with all goals covered (of 129)	Of the 92 entities that have goals
20	52	15
40	74	37
60	86	49
80	94	57
100	99	62
120	103	66
140	112	75
160	122	85
170 (all)	129	92

Non-goal keys implemented (top N of 202, triggers included)	Entities with all non-goal keys covered
20	5
40	10
60	30
80	38
100	59
120	74
140	88
160	101
180	112
202 (all)	129

Joint coverage (both lists): 20 goals and 60 components cover 27 entities; 40 and 100 cover 50; 60 and 120 cover 60; 80 and 140 cover 75; 100 and 160 cover 85.

The order to implement, by entities unlocked: goals look_at_player 69, random_stroll 64, random_look_around 55, float 49, nearest_attackable_target 49, hurt_by_target 42, panic 37, melee_box_attack 32, tempt 31, avoid_mob_type 28, breed 26, mount_pathing 26, follow_parent 24, pickup_items 20, equip_item 17, ranged_attack 14, random_swim 12, player_ride_tamed 10, find_mount 8, flee_sun 7, then a tail where 91 goals belong to one entity each and 123 to at most two. Components: physics 126, collision_box 125, type_family 124, conditional_bandwidth_optimization 117, health 94, nameable 94, movement 93, is_hidden_when_invisible 92, pushable_by_block 91, hurt_on_condition 87, pushable_by_entity 85, breathable 84, experience_reward 80, jump.static 79, loot 78, despawn 76, navigation.walk 66, movement.basic 65, can_climb 57, attack 48, scale 48, is_baby 44, leashable 43, offspring 43, spawn_egg_interaction 43, leashable_to 42, damage_sensor 40, balloonable 39, rideable 36, ageable 35, ambient_sound_interval 32, interact 32, environment_sensor 29, variant 29, follow_range 27, pushable 27, breedable 26, on_target_acquired 22, angry 20, inventory 20, shareables 19, timer 19, equipment 18, persistent 18, projectile 18, equip_item 17, then 58 single-entity components. The non-goal curve is flatter than the goal curve because most entities carry 25 to 40 distinct components, so a mob is not runnable until about 100 components exist; the goal curve is steep because the top 20 goals are the whole AI of the farm animals and the plain hostiles.

Minimal engine, in order

1. Loader: layer composition, format_version dispatch, the five top-level keys, description fields, properties with types, ranges, clamping and client_sync, lenient JSON (comments and trailing commas appear in trade tables), namespace stripping for loot functions, and the integer subject/operator encoding plus AND/OR aliases in filters.
2. Event engine: add, remove, sequence, randomize with weight, trigger (string and object, six targets), filters, set_property (literal and Molang with query.property), first_valid, play_sound, emit_vibration, emit_particle, set_home_position, reset_target, drop_item, stop_movement, execute_event_on_home_block, queue_command; deferred application until the entity's next tick; built-in spawn events and /summon spawn event names in type<event> form.
3. Filters: the 87 tests in section 3 with subject resolution for self, other, target, player, block, damager, parent, baby, and the 10 operators.
4. Components in use order from the table above, with environment_sensor, damage_sensor, timer, interact, transformation, despawn, loot, equipment as the ones that drive events and tables.
5. Goals in use order; a goal scheduler with priority and control_flags; the entity_types matcher shared by the targeting goals.
6. A Molang subset for experience_reward, ambient_sound_interval.condition, property defaults and set_property.
7. Loot evaluator: pools, integer and range rolls, bonus_rolls, tiers, weights, quality, nested and inline tables, the 18 functions and 16 conditions in section 5 with the kill context (killer, looting level, on fire, difficulty, regional difficulty, biome tag, variant).
8. Spawn rules: the 21 components in section 4, the six pools with caps this project chooses, surface and underground passes, herd placement with event, initial_event and event_skip_count, permute_type, spawn_event, and the pillager_patrol pseudo-entity.
9. Trading: the schema in section 6 over the 14 economy tables, num_to_select, tier unlock by trader_exp against total_exp_required, max_uses plus trade_resupply, price_multiplier demand, cured and hero discounts, item filters, and the five trade functions.

Open questions

• Spawn attempt rates, pool cap values, the surface versus underground classification and the light value used by brightness_filter are not documented; they have to be measured against a running BDS or taken from community wikis, which are not primary sources.
• Trade price, demand and restock formulas, the mapping from trader_exp to villager level, and the rarity field of minecraft:weight have no public specification.
• first_valid, set_home_position, drop_item, stop_movement and execute_event_on_home_block event actions; the count entry key, add and limit function parameters, type: "minecraft:chest", quality and tiers semantics in loot tables; and the loot conditions biome_has_tag, passenger_of_entity, is_baby, bool_property, damaged_by_entity are used by vanilla and documented nowhere.
• The 1.26 serializer's integer subject and operator values are inferred from one comparison each (1 is other, 0 is ==, 1 is !=); the full operator numbering beyond 0 and 1 is unknown.
• Two minecraft:loot targets (entities/fox.json, entities/piglin.json) and one nested name (gameplay/fishing/fish) do not exist in the pack; whether the engine treats a missing table as empty or falls back is not documented.
• minecraft:spawns_above_block_filter, minecraft:is_persistent and minecraft:is_experimental exist in the spawn schema with empty or minimal bodies and no vanilla use; their semantics are unknown.
• The schema's Trade defaults (max_uses 7, price_multiplier 0) and the docs' (12, 0.05) disagree; vanilla sets max_uses explicitly on every economy trade, so the discrepancy only matters for custom packs.
• bedrock-samples ships 128 entity files; BDS composes 129 (agent.json, format 1.21.90, is_experimental: true). The previous note's count of 130 identifiers was taken across all layers before composition.

Reproduction

All scripts live in /tmp/bds-research-entities/tools/ and take paths as arguments; downloads sit in their own directories under /tmp/bds-research-entities/.

# Compose the vanilla layers (base `vanilla`, then vanilla_<version> ascending; later file names win;
# reads __brarchive/<folder>.brarchive and __brarchive/<folder>/<sub>.brarchive and loose folders)
node /tmp/bds-research-entities/tools/compose.mjs /tmp/bds-research/bds/extracted/behavior_packs \
  /tmp/bds-research-entities/composed entities spawn_rules loot_tables trading
# -> entities: 129 files, spawn_rules: 60, loot_tables: 309, trading: 27; provenance.json lists the layer per file

# bedrock-samples v1.26.50.4 "min" asset (text only) and the docs source at a pinned commit
cd /tmp/bds-research-entities/samples && curl -sS -L -o min.zip \
  https://github.com/Mojang/bedrock-samples/releases/download/v1.26.50.4/bedrock-samples-v1.26.50.4-min.zip
shasum -a 256 min.zip   # 2bb667786f4d5bedf97a61cec4ce9613c1e2986224c9deda5fbb108c2d96b07c
unzip -q -o min.zip -d unpacked
cd /tmp/bds-research-entities/docs && git clone -q --depth 1 --filter=blob:none --sparse \
  https://github.com/MicrosoftDocs/minecraft-creator.git repo && cd repo && git sparse-checkout set \
  creator/Reference/Content/EntityReference creator/Reference/Content/LootTableReference \
  creator/Reference/Content/TradeTableReference creator/Documents && git rev-parse HEAD
# -> 4432fb62a8e0ce5c785bd2bf02a6f981dcffbbe8

# Tallies (python3 -I; the composed tree and the samples are untrusted input)
python3 -I /tmp/bds-research-entities/tools/entities.py   /tmp/bds-research-entities/composed /tmp/bds-research-entities/out/entities.json
python3 -I /tmp/bds-research-entities/tools/spawn_loot.py /tmp/bds-research-entities/composed /tmp/bds-research-entities/out/spawn_loot.json
python3 -I /tmp/bds-research-entities/tools/trades.py     /tmp/bds-research-entities/samples/unpacked/behavior_pack
# entities.json holds components (entities, instances, base, group), params, filters, event keys,
# goal_order/other_order and the coverage dictionaries quoted in section 7.

# Docs lists for the cross-check
grep -oE '^\| \[[^]]+\]' creator/Reference/Content/EntityReference/Examples/ComponentList.md | wc -l   # 205 rows
grep -oE '^\| \[[^]]+\]' creator/Reference/Content/EntityReference/Examples/AIGoalList.md    | wc -l   # 182 rows
grep -oE '^\| \[[^]]+\]' creator/Reference/Content/EntityReference/Examples/FilterList.md    | wc -l   # 108 rows

# Which BDS trade files are binary
for f in /tmp/bds-research-entities/composed/trading/*.json /tmp/bds-research-entities/composed/trading/economy_trades/*.json; do
  printf '%s ' "$f"; head -c 4 "$f" | xxd -p; done   # 7f4d4342 is \x7fMCB