diff --git a/src/main/java/org/geysermc/packgenerator/PackManager.java b/src/main/java/org/geysermc/packgenerator/PackManager.java
index 116865c..d13ed4b 100644
--- a/src/main/java/org/geysermc/packgenerator/PackManager.java
+++ b/src/main/java/org/geysermc/packgenerator/PackManager.java
@@ -17,6 +17,7 @@ import org.geysermc.packgenerator.mappings.GeyserMappings;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.List;
 import java.util.Optional;
 
 public final class PackManager {
@@ -55,6 +56,7 @@ public final class PackManager {
         ResourceLocation model = patchedModel.get();
         String displayName = stack.getHoverName().getString();
         GeyserMapping mapping = new GeyserMapping(model, model, Optional.of(displayName),
+                List.of(),
                 new GeyserMapping.BedrockOptions(Optional.empty(), true, false, 0),
                 stack.getComponentsPatch());
         mappings.map(stack.getItemHolder(), mapping);
diff --git a/src/main/java/org/geysermc/packgenerator/mappings/GeyserMapping.java b/src/main/java/org/geysermc/packgenerator/mappings/GeyserMapping.java
index 042c6a3..c75a1a3 100644
--- a/src/main/java/org/geysermc/packgenerator/mappings/GeyserMapping.java
+++ b/src/main/java/org/geysermc/packgenerator/mappings/GeyserMapping.java
@@ -6,6 +6,7 @@ import net.minecraft.core.component.DataComponentPatch;
 import net.minecraft.core.component.DataComponentType;
 import net.minecraft.core.component.DataComponents;
 import net.minecraft.resources.ResourceLocation;
+import org.geysermc.packgenerator.mappings.predicate.GeyserPredicate;
 
 import java.util.List;
 import java.util.Optional;
@@ -13,7 +14,7 @@ import java.util.function.Function;
 
 // TODO predicates, etc.
 public record GeyserMapping(ResourceLocation model, ResourceLocation bedrockIdentifier, Optional<String> displayName,
-                            BedrockOptions bedrockOptions, DataComponentPatch components) {
+                            List<GeyserPredicate> predicates, BedrockOptions bedrockOptions, DataComponentPatch components) {
     private static final List<DataComponentType<?>> SUPPORTED_COMPONENTS = List.of(DataComponents.CONSUMABLE, DataComponents.EQUIPPABLE, DataComponents.FOOD,
             DataComponents.MAX_DAMAGE, DataComponents.MAX_STACK_SIZE, DataComponents.USE_COOLDOWN, DataComponents.ENCHANTABLE, DataComponents.ENCHANTMENT_GLINT_OVERRIDE);
 
@@ -37,10 +38,11 @@ public record GeyserMapping(ResourceLocation model, ResourceLocation bedrockIden
                     ResourceLocation.CODEC.fieldOf("model").forGetter(GeyserMapping::model),
                     ResourceLocation.CODEC.fieldOf("bedrock_identifier").forGetter(GeyserMapping::bedrockIdentifier),
                     Codec.STRING.optionalFieldOf("display_name").forGetter(GeyserMapping::displayName),
+                    GeyserPredicate.LIST_CODEC.optionalFieldOf("predicates", List.of()).forGetter(GeyserMapping::predicates),
                     BedrockOptions.CODEC.fieldOf("bedrock_options").forGetter(GeyserMapping::bedrockOptions),
                     FILTERED_COMPONENT_MAP_CODEC.fieldOf("components").forGetter(GeyserMapping::components)
-            ).apply(instance, (type, model, bedrockIdentifier, displayName, bedrockOptions, components)
-                    -> new GeyserMapping(model, bedrockIdentifier, displayName, bedrockOptions, components))
+            ).apply(instance, (type, model, bedrockIdentifier, displayName, predicates, bedrockOptions, components)
+                    -> new GeyserMapping(model, bedrockIdentifier, displayName, predicates, bedrockOptions, components))
     );
 
     public record BedrockOptions(Optional<String> icon, boolean allowOffhand, boolean displayHandheld, int protectionValue) {
diff --git a/src/main/java/org/geysermc/packgenerator/mappings/predicate/GeyserConditionPredicate.java b/src/main/java/org/geysermc/packgenerator/mappings/predicate/GeyserConditionPredicate.java
new file mode 100644
index 0000000..46e0b74
--- /dev/null
+++ b/src/main/java/org/geysermc/packgenerator/mappings/predicate/GeyserConditionPredicate.java
@@ -0,0 +1,92 @@
+package org.geysermc.packgenerator.mappings.predicate;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.MapCodec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import net.minecraft.core.component.DataComponentType;
+import net.minecraft.util.ExtraCodecs;
+import net.minecraft.util.StringRepresentable;
+import org.jetbrains.annotations.NotNull;
+
+public record GeyserConditionPredicate(ConditionProperty property, boolean expected) implements GeyserPredicate {
+
+    public static final MapCodec<GeyserConditionPredicate> CODEC = RecordCodecBuilder.mapCodec(instance ->
+            instance.group(
+                    ConditionProperty.CODEC.forGetter(GeyserConditionPredicate::property),
+                    Codec.BOOL.optionalFieldOf("expected", true).forGetter(GeyserConditionPredicate::expected)
+            ).apply(instance, GeyserConditionPredicate::new)
+    );
+
+    public static final ConditionProperty BROKEN = unit(ConditionProperty.Type.BROKEN);
+    public static final ConditionProperty DAMAGED = unit(ConditionProperty.Type.DAMAGED);
+    public static final ConditionProperty FISHING_ROD_CAST = unit(ConditionProperty.Type.FISHING_ROD_CAST);
+
+    @Override
+    public Type type() {
+        return Type.CONDITION;
+    }
+
+    public interface ConditionProperty {
+
+        MapCodec<ConditionProperty> CODEC = Type.CODEC.dispatchMap("property", ConditionProperty::type, Type::codec);
+
+        Type type();
+
+        enum Type implements StringRepresentable {
+            BROKEN("broken", MapCodec.unit(GeyserConditionPredicate.BROKEN)),
+            DAMAGED("damaged", MapCodec.unit(GeyserConditionPredicate.DAMAGED)),
+            CUSTOM_MODEL_DATA("custom_model_data", CustomModelData.CODEC),
+            HAS_COMPONENT("has_component", HasComponent.CODEC),
+            FISHING_ROD_CAST("fishing_rod_cast", MapCodec.unit(GeyserConditionPredicate.FISHING_ROD_CAST));
+
+            public static final Codec<Type> CODEC = StringRepresentable.fromEnum(Type::values);
+
+            private final String name;
+            private final MapCodec<? extends ConditionProperty> codec;
+
+            Type(String name, MapCodec<? extends ConditionProperty> codec) {
+                this.name = name;
+                this.codec = codec;
+            }
+
+            public MapCodec<? extends ConditionProperty> codec() {
+                return codec;
+            }
+
+            @Override
+            public @NotNull String getSerializedName() {
+                return name;
+            }
+        }
+    }
+
+    public record CustomModelData(int index) implements ConditionProperty {
+        public static final MapCodec<CustomModelData> CODEC = RecordCodecBuilder.mapCodec(instance ->
+                instance.group(
+                        ExtraCodecs.NON_NEGATIVE_INT.optionalFieldOf("index", 0).forGetter(CustomModelData::index)
+                ).apply(instance, CustomModelData::new)
+        );
+
+        @Override
+        public Type type() {
+            return Type.CUSTOM_MODEL_DATA;
+        }
+    }
+
+    public record HasComponent(DataComponentType<?> component) implements ConditionProperty {
+        public static final MapCodec<HasComponent> CODEC = RecordCodecBuilder.mapCodec(instance ->
+                instance.group(
+                        DataComponentType.CODEC.fieldOf("component").forGetter(HasComponent::component)
+                ).apply(instance, HasComponent::new)
+        );
+
+        @Override
+        public Type type() {
+            return Type.HAS_COMPONENT;
+        }
+    }
+
+    private static ConditionProperty unit(ConditionProperty.Type type) {
+        return () -> type;
+    }
+}
diff --git a/src/main/java/org/geysermc/packgenerator/mappings/predicate/GeyserPredicate.java b/src/main/java/org/geysermc/packgenerator/mappings/predicate/GeyserPredicate.java
new file mode 100644
index 0000000..f140e0d
--- /dev/null
+++ b/src/main/java/org/geysermc/packgenerator/mappings/predicate/GeyserPredicate.java
@@ -0,0 +1,40 @@
+package org.geysermc.packgenerator.mappings.predicate;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.MapCodec;
+import net.minecraft.util.ExtraCodecs;
+import net.minecraft.util.StringRepresentable;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public interface GeyserPredicate {
+
+    Codec<GeyserPredicate> CODEC = Type.CODEC.dispatch(GeyserPredicate::type, Type::codec);
+    Codec<List<GeyserPredicate>> LIST_CODEC = ExtraCodecs.compactListCodec(CODEC);
+
+    Type type();
+
+    enum Type implements StringRepresentable {
+        CONDITION("condition", GeyserConditionPredicate.CODEC);
+
+        public static final Codec<Type> CODEC = StringRepresentable.fromEnum(Type::values);
+
+        private final String name;
+        private final MapCodec<? extends GeyserPredicate> codec;
+
+        Type(String name, MapCodec<? extends GeyserPredicate> codec) {
+            this.name = name;
+            this.codec = codec;
+        }
+
+        public MapCodec<? extends GeyserPredicate> codec() {
+            return codec;
+        }
+
+        @Override
+        public @NotNull String getSerializedName() {
+            return name;
+        }
+    }
+}