an attempt was made at understanding how interactions work without any documentation

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+.kotlin
+libraries/
+
+
+### IntelliJ IDEA ###
+.idea/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>me.youhavetrouble.quickerstacker</groupId>
+    <artifactId>QuickerStacker</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>25</maven.compiler.source>
+        <maven.compiler.target>25</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <defaultGoal>clean package</defaultGoal>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.hypixel.hytale</groupId>
+            <artifactId>HytaleServer-parent</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>system</scope>
+            <systemPath>${project.basedir}/libraries/HytaleServer.jar</systemPath>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/me/youhavetrouble/quickerstacker/QuickerStacker.java

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+package me.youhavetrouble.quickerstacker;
+
+
+import com.hypixel.hytale.server.core.modules.interaction.interaction.config.Interaction;
+import com.hypixel.hytale.server.core.plugin.JavaPlugin;
+import com.hypixel.hytale.server.core.plugin.JavaPluginInit;
+import me.youhavetrouble.quickerstacker.interaction.ChestInteraction;
+import org.checkerframework.checker.nullness.compatqual.NonNullDecl;
+
+public class QuickerStacker extends JavaPlugin {
+
+    public QuickerStacker(@NonNullDecl JavaPluginInit init) {
+        super(init);
+
+        this.getCodecRegistry(Interaction.CODEC).register("YouHaveTrouble_QuickerStacker_QuickStackToChest", ChestInteraction.class, ChestInteraction.CODEC);
+
+    }
+
+}

src/main/java/me/youhavetrouble/quickerstacker/interaction/ChestInteraction.java

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+package me.youhavetrouble.quickerstacker.interaction;
+
+
+import com.hypixel.hytale.codec.builder.BuilderCodec;
+import com.hypixel.hytale.component.CommandBuffer;
+import com.hypixel.hytale.component.Ref;
+import com.hypixel.hytale.component.Store;
+import com.hypixel.hytale.math.util.ChunkUtil;
+import com.hypixel.hytale.math.vector.Vector3i;
+import com.hypixel.hytale.protocol.BlockPosition;
+import com.hypixel.hytale.protocol.InteractionSyncData;
+import com.hypixel.hytale.protocol.InteractionType;
+import com.hypixel.hytale.server.core.Message;
+import com.hypixel.hytale.server.core.entity.InteractionContext;
+import com.hypixel.hytale.server.core.entity.entities.Player;
+import com.hypixel.hytale.server.core.inventory.Inventory;
+import com.hypixel.hytale.server.core.inventory.ItemStack;
+import com.hypixel.hytale.server.core.modules.interaction.interaction.CooldownHandler;
+import com.hypixel.hytale.server.core.modules.interaction.interaction.config.SimpleInstantInteraction;
+import com.hypixel.hytale.server.core.modules.interaction.interaction.config.client.SimpleBlockInteraction;
+import com.hypixel.hytale.server.core.universe.world.World;
+import com.hypixel.hytale.server.core.universe.world.chunk.WorldChunk;
+import com.hypixel.hytale.server.core.universe.world.meta.state.ItemContainerState;
+import com.hypixel.hytale.server.core.universe.world.storage.EntityStore;
+import com.hypixel.hytale.server.core.util.NotificationUtil;
+import org.checkerframework.checker.nullness.compatqual.NonNullDecl;
+import org.checkerframework.checker.nullness.compatqual.NullableDecl;
+
+public class ChestInteraction extends SimpleBlockInteraction {
+
+    public static final BuilderCodec<ChestInteraction> CODEC = BuilderCodec
+            .builder(ChestInteraction.class, ChestInteraction::new)
+            .build();
+
+    @Override
+    protected void interactWithBlock(
+            @NonNullDecl World world,
+            @NonNullDecl CommandBuffer<EntityStore> commandBuffer,
+            @NonNullDecl InteractionType interactionType,
+            @NonNullDecl InteractionContext interactionContext,
+            @NullableDecl ItemStack itemStack,
+            @NonNullDecl Vector3i vector3i,
+            @NonNullDecl CooldownHandler cooldownHandler
+    ) {
+        Ref<EntityStore> ref = interactionContext.getEntity();
+        Player player = ref.getStore().getComponent(ref, Player.getComponentType());
+        if (player == null) return;
+        NotificationUtil.sendNotification(player.getPlayerRef().getPacketHandler(), "Interaction happened!  "+ interactionType.name());
+        player.sendMessage(Message.raw("Interaction: " + interactionType.name()));
+        InteractionSyncData clientState = interactionContext.getClientState();
+        if (clientState == null) return;
+        BlockPosition targetBlockPosition = clientState.blockPosition;
+        if (targetBlockPosition == null) return;
+        WorldChunk chunk = world.getChunk(ChunkUtil.indexChunkFromBlock(targetBlockPosition.x, targetBlockPosition.z));
+        if (chunk == null) return;
+        var blockState = chunk.getState(targetBlockPosition.x, targetBlockPosition.y, targetBlockPosition.z);
+        if (!(blockState instanceof ItemContainerState containerState)) return;
+
+        Inventory playerInventory = player.getInventory();
+        if (playerInventory == null) return;
+        playerInventory.getCombinedHotbarFirst().quickStackTo(containerState.getItemContainer());
+        player.sendMessage(Message.raw("Quick stacked items to chest."));
+    }
+
+    @Override
+    protected void simulateInteractWithBlock(@NonNullDecl InteractionType interactionType, @NonNullDecl InteractionContext interactionContext, @NullableDecl ItemStack itemStack, @NonNullDecl World world, @NonNullDecl Vector3i vector3i) {
+
+    }
+}

src/main/resources/Server/Item/Interactions/Block/YouHaveTrouble_QuickerStacker_QuickStackToChest.json

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+{
+  "Type": "YouHaveTrouble_QuickerStacker_QuickStackToChest"
+}

src/main/resources/Server/Item/Interactions/Tests/QuickStackToChest.json

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+{
+  "Type": "UseBlock",
+  "Next": {
+    "Type": "YouHaveTrouble_QuickerStacker_QuickStackToChest",
+    "RunTime": 0.5
+  },
+  "Failed": {
+    "Type": "Simple",
+    "RunTime": 0.5
+  }
+}

src/main/resources/Server/Item/RootInteractions/Block/YouHaveTrouble_QuickerStacker_QuickStackToChest.json

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+{
+  "Interactions": [
+    "YouHaveTrouble_QuickerStacker_QuickStackToChest"
+  ]
+}

src/main/resources/manifest.json

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+{
+  "Group": "me.youhavetrouble.quickerstacker",
+  "Name": "QuickerStacker",
+  "Version": "1.0.0",
+  "Description": "Quick stack everything!",
+  "Authors": [
+    {
+      "Name": "YouHaveTrouble",
+      "Email": "youhavetrouble@youhavetrouble.me",
+      "Url": "https://yht.one"
+    }
+  ],
+  "ServerVersion": "*",
+  "Dependencies": {},
+  "OptionalDependencies": {},
+  "DisabledByDefault": false,
+  "IncludesAssetPack": false,
+  "Main": "me.youhavetrouble.quickerstacker.QuickerStacker"
+}