【2026年】Claude CodeでマイクラMod開発【応用編】カスタムMob・ワールド生成・公開方法

// RubyGolemEntity.java（抜粋）

public class RubyGolemEntity extends IronGolem {
    public RubyGolemEntity(EntityType<? extends IronGolem> type, Level level) {
        super(type, level);
    }

    public static AttributeSupplier.Builder createAttributes() {
        return Mob.createMobAttributes()
            .add(Attributes.MAX_HEALTH, 100.0D)
            .add(Attributes.MOVEMENT_SPEED, 0.25D)
            .add(Attributes.KNOCKBACK_RESISTANCE, 1.0D)
            .add(Attributes.ATTACK_DAMAGE, 15.0D);
    }

    @Override
    protected void registerGoals() {
        this.goalSelector.addGoal(1, new MeleeAttackGoal(this, 1.0D, true));
        this.goalSelector.addGoal(2, new MoveTowardsTargetGoal(this, 0.9D, 32.0F));
        this.goalSelector.addGoal(3, new LookAtPlayerGoal(this, Player.class, 6.0F));
        this.goalSelector.addGoal(4, new RandomLookAroundGoal(this));

        this.targetSelector.addGoal(1, new HurtByTargetGoal(this));
        this.targetSelector.addGoal(2, new NearestAttackableTargetGoal<>(
            this, Mob.class, 5, false, false,
            (entity) -> entity instanceof Enemy
        ));
    }
}

// ModEntities.java

public class ModEntities {
    public static final DeferredRegister<EntityType<?>> ENTITIES =
        DeferredRegister.create(ForgeRegistries.ENTITY_TYPES, MOD_ID);

    public static final RegistryObject<EntityType<RubyGolemEntity>> RUBY_GOLEM =
        ENTITIES.register("ruby_golem",
            () -> EntityType.Builder.of(RubyGolemEntity::new, MobCategory.MISC)
                .sized(1.4F, 2.7F)
                .clientTrackingRange(10)
                .build("ruby_golem"));
}

// biome_modifier/add_ruby_ore.json

{
  "type": "neoforge:add_features",
  "biomes": "#minecraft:is_overworld",
  "features": "mymod:ruby_ore",
  "step": "underground_ores"
}

// ModToolTiers.java（NeoForge 1.21.x対応）

public class ModToolTiers {
    public static final Tier RUBY = new Tier() {
        @Override
        public int getUses() { return 1800; }

        @Override
        public float getSpeed() { return 9.0F; }

        @Override
        public float getAttackDamageBonus() { return 4.0F; }

        @Override
        public TagKey<Block> getIncorrectBlocksForDrops() {
            return BlockTags.INCORRECT_FOR_DIAMOND_TOOL;
        }

        @Override
        public int getEnchantmentValue() { return 12; }

        @Override
        public Ingredient getRepairIngredient() {
            return Ingredient.of(ModItems.RUBY.get());
        }
    };
}

// ModItems.java（ツール部分）

// ルビーツール
public static final RegistryObject<Item> RUBY_SWORD = ITEMS.register("ruby_sword",
    () -> new SwordItem(ModToolTiers.RUBY, 3, -2.4F,
        new Item.Properties()));

public static final RegistryObject<Item> RUBY_PICKAXE = ITEMS.register("ruby_pickaxe",
    () -> new PickaxeItem(ModToolTiers.RUBY, 1, -2.8F,
        new Item.Properties()));

public static final RegistryObject<Item> RUBY_AXE = ITEMS.register("ruby_axe",
    () -> new AxeItem(ModToolTiers.RUBY, 5.0F, -3.0F,
        new Item.Properties()));

public static final RegistryObject<Item> RUBY_SHOVEL = ITEMS.register("ruby_shovel",
    () -> new ShovelItem(ModToolTiers.RUBY, 1.5F, -3.0F,
        new Item.Properties()));

public static final RegistryObject<Item> RUBY_HOE = ITEMS.register("ruby_hoe",
    () -> new HoeItem(ModToolTiers.RUBY, -3, 0.0F,
        new Item.Properties()));

// ModArmorMaterials.java

public class ModArmorMaterials {
    public static final Holder<ArmorMaterial> RUBY = register("ruby",
        Map.of(
            ArmorItem.Type.HELMET, 3,
            ArmorItem.Type.CHESTPLATE, 8,
            ArmorItem.Type.LEGGINGS, 6,
            ArmorItem.Type.BOOTS, 3
        ),
        25,  // エンチャント適性
        SoundEvents.ARMOR_EQUIP_DIAMOND,
        2.0F,  // 防御力ボーナス
        0.1F,  // ノックバック耐性
        () -> Ingredient.of(ModItems.RUBY.get())
    );

    private static Holder<ArmorMaterial> register(String name,
            Map<ArmorItem.Type, Integer> defense, int enchantability,
            Holder<SoundEvent> equipSound, float toughness,
            float knockbackResistance, Supplier<Ingredient> repairIngredient) {
        // 登録処理...
    }
}