diff --git a/src/commands/delete-box-brush-command.ts b/src/commands/delete-box-brush-command.ts
new file mode 100644
index 00000000..56b75155
--- /dev/null
+++ b/src/commands/delete-box-brush-command.ts
@@ -0,0 +1,78 @@
+import { createOpaqueId } from "../core/ids";
+import type { EditorSelection } from "../core/selection";
+import type { ToolMode } from "../core/tool-mode";
+import { cloneBoxBrush, type BoxBrush } from "../document/brushes";
+
+import { cloneSelectionForCommand, removeBrush } from "./brush-command-helpers";
+import type { EditorCommand } from "./command";
+
+function selectionIncludesBrush(selection: EditorSelection, brushId: string): boolean {
+  return (
+    (selection.kind === "brushes" && selection.ids.includes(brushId)) ||
+    (selection.kind === "brushFace" && selection.brushId === brushId)
+  );
+}
+
+export function createDeleteBoxBrushCommand(brushId: string): EditorCommand {
+  let previousBrush: BoxBrush | null = null;
+  let previousSelection: EditorSelection | null = null;
+  let previousToolMode: ToolMode | null = null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: "Delete box brush",
+    execute(context) {
+      const currentDocument = context.getDocument();
+      const currentBrush = currentDocument.brushes[brushId];
+
+      if (currentBrush === undefined) {
+        throw new Error(`Box brush ${brushId} does not exist.`);
+      }
+
+      if (previousBrush === null) {
+        previousBrush = cloneBoxBrush(currentBrush);
+      }
+
+      if (previousSelection === null) {
+        previousSelection = cloneSelectionForCommand(context.getSelection());
+      }
+
+      if (previousToolMode === null) {
+        previousToolMode = context.getToolMode();
+      }
+
+      context.setDocument(removeBrush(currentDocument, brushId));
+
+      if (selectionIncludesBrush(context.getSelection(), brushId)) {
+        context.setSelection({
+          kind: "none"
+        });
+      }
+
+      context.setToolMode("select");
+    },
+    undo(context) {
+      if (previousBrush === null) {
+        return;
+      }
+
+      const currentDocument = context.getDocument();
+
+      context.setDocument({
+        ...currentDocument,
+        brushes: {
+          ...currentDocument.brushes,
+          [previousBrush.id]: cloneBoxBrush(previousBrush)
+        }
+      });
+
+      if (previousSelection !== null) {
+        context.setSelection(previousSelection);
+      }
+
+      if (previousToolMode !== null) {
+        context.setToolMode(previousToolMode);
+      }
+    }
+  };
+}
diff --git a/src/commands/delete-entity-command.ts b/src/commands/delete-entity-command.ts
new file mode 100644
index 00000000..ede9ff98
--- /dev/null
+++ b/src/commands/delete-entity-command.ts
@@ -0,0 +1,82 @@
+import { createOpaqueId } from "../core/ids";
+import { cloneEditorSelection, type EditorSelection } from "../core/selection";
+import type { ToolMode } from "../core/tool-mode";
+import { cloneEntityInstance, type EntityInstance } from "../entities/entity-instances";
+
+import type { EditorCommand } from "./command";
+
+function selectionIncludesEntity(selection: EditorSelection, entityId: string): boolean {
+  return selection.kind === "entities" && selection.ids.includes(entityId);
+}
+
+export function createDeleteEntityCommand(entityId: string): EditorCommand {
+  let previousEntity: EntityInstance | null = null;
+  let previousSelection: EditorSelection | null = null;
+  let previousToolMode: ToolMode | null = null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: "Delete entity",
+    execute(context) {
+      const currentDocument = context.getDocument();
+      const currentEntity = currentDocument.entities[entityId];
+
+      if (currentEntity === undefined) {
+        throw new Error(`Entity ${entityId} does not exist.`);
+      }
+
+      if (previousEntity === null) {
+        previousEntity = cloneEntityInstance(currentEntity);
+      }
+
+      if (previousSelection === null) {
+        previousSelection = cloneEditorSelection(context.getSelection());
+      }
+
+      if (previousToolMode === null) {
+        previousToolMode = context.getToolMode();
+      }
+
+      const nextEntities = {
+        ...currentDocument.entities
+      };
+      delete nextEntities[entityId];
+
+      context.setDocument({
+        ...currentDocument,
+        entities: nextEntities
+      });
+
+      if (selectionIncludesEntity(context.getSelection(), entityId)) {
+        context.setSelection({
+          kind: "none"
+        });
+      }
+
+      context.setToolMode("select");
+    },
+    undo(context) {
+      if (previousEntity === null) {
+        return;
+      }
+
+      const currentDocument = context.getDocument();
+
+      context.setDocument({
+        ...currentDocument,
+        entities: {
+          ...currentDocument.entities,
+          [previousEntity.id]: cloneEntityInstance(previousEntity)
+        }
+      });
+
+      if (previousSelection !== null) {
+        context.setSelection(previousSelection);
+      }
+
+      if (previousToolMode !== null) {
+        context.setToolMode(previousToolMode);
+      }
+    }
+  };
+}
diff --git a/src/commands/delete-model-instance-command.ts b/src/commands/delete-model-instance-command.ts
new file mode 100644
index 00000000..5d1f5517
--- /dev/null
+++ b/src/commands/delete-model-instance-command.ts
@@ -0,0 +1,82 @@
+import { createOpaqueId } from "../core/ids";
+import { cloneEditorSelection, type EditorSelection } from "../core/selection";
+import type { ToolMode } from "../core/tool-mode";
+import { cloneModelInstance, type ModelInstance } from "../assets/model-instances";
+
+import type { EditorCommand } from "./command";
+
+function selectionIncludesModelInstance(selection: EditorSelection, modelInstanceId: string): boolean {
+  return selection.kind === "modelInstances" && selection.ids.includes(modelInstanceId);
+}
+
+export function createDeleteModelInstanceCommand(modelInstanceId: string): EditorCommand {
+  let previousModelInstance: ModelInstance | null = null;
+  let previousSelection: EditorSelection | null = null;
+  let previousToolMode: ToolMode | null = null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: "Delete model instance",
+    execute(context) {
+      const currentDocument = context.getDocument();
+      const currentModelInstance = currentDocument.modelInstances[modelInstanceId];
+
+      if (currentModelInstance === undefined) {
+        throw new Error(`Model instance ${modelInstanceId} does not exist.`);
+      }
+
+      if (previousModelInstance === null) {
+        previousModelInstance = cloneModelInstance(currentModelInstance);
+      }
+
+      if (previousSelection === null) {
+        previousSelection = cloneEditorSelection(context.getSelection());
+      }
+
+      if (previousToolMode === null) {
+        previousToolMode = context.getToolMode();
+      }
+
+      const nextModelInstances = {
+        ...currentDocument.modelInstances
+      };
+      delete nextModelInstances[modelInstanceId];
+
+      context.setDocument({
+        ...currentDocument,
+        modelInstances: nextModelInstances
+      });
+
+      if (selectionIncludesModelInstance(context.getSelection(), modelInstanceId)) {
+        context.setSelection({
+          kind: "none"
+        });
+      }
+
+      context.setToolMode("select");
+    },
+    undo(context) {
+      if (previousModelInstance === null) {
+        return;
+      }
+
+      const currentDocument = context.getDocument();
+
+      context.setDocument({
+        ...currentDocument,
+        modelInstances: {
+          ...currentDocument.modelInstances,
+          [previousModelInstance.id]: cloneModelInstance(previousModelInstance)
+        }
+      });
+
+      if (previousSelection !== null) {
+        context.setSelection(previousSelection);
+      }
+
+      if (previousToolMode !== null) {
+        context.setToolMode(previousToolMode);
+      }
+    }
+  };
+}