diff --git a/projects/common/src/main/java/dan200/computercraft/data/TagProvider.java b/projects/common/src/main/java/dan200/computercraft/data/TagProvider.java
index 9b207e09d..4d273bb9e 100644
--- a/projects/common/src/main/java/dan200/computercraft/data/TagProvider.java
+++ b/projects/common/src/main/java/dan200/computercraft/data/TagProvider.java
@@ -6,6 +6,7 @@
 
 import dan200.computercraft.api.ComputerCraftTags;
 import dan200.computercraft.shared.ModRegistry;
+import dan200.computercraft.shared.integration.ExternalModTags;
 import dan200.computercraft.shared.platform.RegistryWrappers;
 import net.minecraft.data.tags.ItemTagsProvider;
 import net.minecraft.data.tags.TagsProvider;
@@ -81,6 +82,12 @@ public static void blockTags(TagConsumer<Block> tags) {
         );
 
         tags.tag(BlockTags.WITHER_IMMUNE).add(ModRegistry.Blocks.COMPUTER_COMMAND.get());
+
+        tags.tag(ExternalModTags.Blocks.CREATE_BRITTLE).add(
+            ModRegistry.Blocks.CABLE.get(),
+            ModRegistry.Blocks.WIRELESS_MODEM_ADVANCED.get(),
+            ModRegistry.Blocks.WIRELESS_MODEM_ADVANCED.get()
+        );
     }
 
     public static void itemTags(ItemTagConsumer tags) {
diff --git a/projects/common/src/main/java/dan200/computercraft/shared/integration/ExternalModTags.java b/projects/common/src/main/java/dan200/computercraft/shared/integration/ExternalModTags.java
new file mode 100644
index 000000000..29a666217
--- /dev/null
+++ b/projects/common/src/main/java/dan200/computercraft/shared/integration/ExternalModTags.java
@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: 2024 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.shared.integration;
+
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.tags.TagKey;
+import net.minecraft.world.level.block.Block;
+
+/**
+ * Tags defined by external mods.
+ */
+public final class ExternalModTags {
+    private ExternalModTags() {
+    }
+
+    /**
+     * Block tags defined by external mods.
+     */
+    public static final class Blocks {
+        private Blocks() {
+        }
+
+        /**
+         * Create's "brittle" tag, used to determine if this block needs to be moved before its neighbours.
+         *
+         * @see <a href="https://github.com/Creators-of-Create/Create/blob/mc1.20.1/dev/src/main/java/com/simibubi/create/content/contraptions/BlockMovementChecks.java">{@code BlockMovementChecks}</a>
+         */
+        public static final TagKey<Block> CREATE_BRITTLE = make("create", "brittle");
+
+        private static TagKey<Block> make(String mod, String name) {
+            return TagKey.create(Registries.BLOCK, new ResourceLocation(mod, name));
+        }
+    }
+}
diff --git a/projects/fabric/src/generated/resources/data/create/tags/blocks/brittle.json b/projects/fabric/src/generated/resources/data/create/tags/blocks/brittle.json
new file mode 100644
index 000000000..32215971e
--- /dev/null
+++ b/projects/fabric/src/generated/resources/data/create/tags/blocks/brittle.json
@@ -0,0 +1,4 @@
+{
+  "replace": false,
+  "values": ["computercraft:cable", "computercraft:wireless_modem_advanced", "computercraft:wireless_modem_advanced"]
+}
diff --git a/projects/forge/src/generated/resources/data/create/tags/blocks/brittle.json b/projects/forge/src/generated/resources/data/create/tags/blocks/brittle.json
new file mode 100644
index 000000000..7dc5f506f
--- /dev/null
+++ b/projects/forge/src/generated/resources/data/create/tags/blocks/brittle.json
@@ -0,0 +1,3 @@
+{
+  "values": ["computercraft:cable", "computercraft:wireless_modem_advanced", "computercraft:wireless_modem_advanced"]
+}