Meta Variables

Normal variables:

Variable	Modifiable
meta_location_x	true
meta_location_y	true
meta_location_z	true
meta_location_pitch	true
meta_location_yaw	true
meta_saturation	true
meta_experience_level	true
meta_experience_points	true
meta_remaining_air	true
meta_max_air	true
meta_fly_speed	true
meta_walk_speed	true
meta_food_level	true
meta_entity_id	false
meta_fire_ticks	true
meta_fall_distance	true
meta_players_online	false
meta_max_health	true
meta_current_health	true
meta_health_scale	true
meta_compass_target_x	true
meta_compass_target_y	true
meta_compass_target_z	true
meta_velocity_x	true
meta_velocity_y	true
meta_velocity_z	true
meta_no_damage_ticks	true
meta_max_no_damage_ticks	true
meta_last_damage	true
meta_sleep_ticks	false
meta_bed_location_x	true
meta_bed_location_y	true
meta_bed_location_z	true
meta_altitude	false
meta_absorption	true
meta_timestamp_days	false
meta_timestamp_hours	false
meta_timestamp_minutes	false
meta_timestamp_seconds	false
meta_timestamp_milliseconds	false
meta_mana	true
meta_max_mana	true
meta_mana_regen	true

Since Beta 14:

Variable	Modifiable
meta_freeze_ticks	true
meta_max_freeze_ticks	false
meta_max_fire_ticks	false
meta_forwards_movement	false
meta_sideways_movement	false

Attribute types:

Find min and max values here.

Modifiable:

Variable
meta_attribute_generic_max_health_base
meta_attribute_generic_follow_range_base
meta_attribute_generic_knockback_resistance_base
meta_attribute_generic_movement_speed_base
meta_attribute_generic_flying_speed_base
meta_attribute_generic_attack_damage_base
meta_attribute_generic_attack_knockback_base
meta_attribute_generic_attack_speed_base
meta_attribute_generic_armor_base
meta_attribute_generic_armor_toughness_base
meta_attribute_generic_luck_base

Not modifiable:

Variable
meta_attribute_generic_max_health
meta_attribute_generic_follow_range
meta_attribute_generic_knockback_resistance
meta_attribute_generic_movement_speed
meta_attribute_generic_flying_speed
meta_attribute_generic_attack_damage
meta_attribute_generic_attack_knockback
meta_attribute_generic_attack_speed
meta_attribute_generic_armor
meta_attribute_generic_armor_toughness
meta_attribute_generic_luck