diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index ba96846..914b38a 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -261,6 +261,21 @@ interface ModelStore {
   gridCalibMode: boolean;
   setGridCalibMode: (b: boolean) => void;
 
+  /** Section/clipping cut tool (X/Y/Z axis-aligned planes in world space). */
+  sectionEnabled: { x: boolean; y: boolean; z: boolean };
+  sectionInvert: { x: boolean; y: boolean; z: boolean };
+  /** Cut level in meters (world coordinates) per axis. */
+  sectionLevel: { x: number; y: number; z: number };
+  sectionPanelOpen: boolean;
+  /** Opacity of the floating section panel (0.2 – 1). */
+  sectionPanelOpacity: number;
+  setSectionEnabled: (axis: 'x' | 'y' | 'z', on: boolean) => void;
+  setSectionInvert: (axis: 'x' | 'y' | 'z', on: boolean) => void;
+  setSectionLevel: (axis: 'x' | 'y' | 'z', v: number) => void;
+  setSectionPanelOpen: (open: boolean) => void;
+  setSectionPanelOpacity: (o: number) => void;
+  resetSection: () => void;
+
   wireframeColor: string;
   setWireframeColor: (color: string) => void;