diff --git a/src/lib/litegraph/src/Reroute.ts b/src/lib/litegraph/src/Reroute.ts
index 4ac682599..d61d632f7 100644
--- a/src/lib/litegraph/src/Reroute.ts
+++ b/src/lib/litegraph/src/Reroute.ts
@@ -1,3 +1,4 @@
+import { GEOMETRY } from '@/renderer/core/constants/geometry'
 import { useLayoutMutations } from '@/renderer/core/layout/operations/layoutMutations'
 import { LayoutSource } from '@/renderer/core/layout/types'
 
@@ -38,7 +39,7 @@ export interface FloatingRerouteSlot {
 export class Reroute
   implements Positionable, LinkSegment, Serialisable<SerialisableReroute>
 {
-  static radius: number = 10
+  static radius: number = GEOMETRY.REROUTE_RADIUS
   /** Maximum distance from reroutes to their bezier curve control points. */
   static maxSplineOffset: number = 80
   static drawIdBadge: boolean = false
diff --git a/src/renderer/core/constants/geometry.ts b/src/renderer/core/constants/geometry.ts
new file mode 100644
index 000000000..10c6fe0ad
--- /dev/null
+++ b/src/renderer/core/constants/geometry.ts
@@ -0,0 +1,17 @@
+/**
+ * Geometry Constants
+ *
+ * Shared geometric constants used across multiple rendering systems.
+ */
+
+export const GEOMETRY = {
+  /**
+   * Reroute radius - CRITICAL: Must stay synchronized
+   */
+  REROUTE_RADIUS: 10,
+
+  /**
+   * Slot height for hit detection and layout calculations
+   */
+  SLOT_HEIGHT: 24
+} as const
diff --git a/src/renderer/core/layout/store/layoutStore.ts b/src/renderer/core/layout/store/layoutStore.ts
index 997254d38..5686d0a2d 100644
--- a/src/renderer/core/layout/store/layoutStore.ts
+++ b/src/renderer/core/layout/store/layoutStore.ts
@@ -8,6 +8,7 @@ import log from 'loglevel'
 import { type ComputedRef, type Ref, computed, customRef } from 'vue'
 import * as Y from 'yjs'
 
+import { GEOMETRY } from '@/renderer/core/constants/geometry'
 import { ACTOR_CONFIG } from '@/renderer/core/layout/constants'
 import type {
   CreateLinkOperation,
@@ -46,9 +47,6 @@ type YEventChange = {
 
 const logger = log.getLogger('LayoutStore')
 
-// Constants
-const REROUTE_RADIUS = 8
-
 class LayoutStoreImpl implements LayoutStore {
   // Yjs document and shared data structures
   private ydoc = new Y.Doc()
@@ -638,10 +636,10 @@ class LayoutStoreImpl implements LayoutStore {
   querySlotAtPoint(point: Point): SlotLayout | null {
     // Use spatial index to get candidate slots
     const searchArea = {
-      x: point.x - 10, // Tolerance for slot size
-      y: point.y - 10,
-      width: 20,
-      height: 20
+      x: point.x - GEOMETRY.SLOT_HEIGHT, // Tolerance for slot size
+      y: point.y - GEOMETRY.SLOT_HEIGHT,
+      width: GEOMETRY.SLOT_HEIGHT * 2,
+      height: GEOMETRY.SLOT_HEIGHT * 2
     }
     const candidateSlotKeys = this.slotSpatialIndex.query(searchArea)
 
@@ -1084,12 +1082,12 @@ class LayoutStoreImpl implements LayoutStore {
     const layout: RerouteLayout = {
       id: operation.rerouteId,
       position: pos,
-      radius: 8,
+      radius: GEOMETRY.REROUTE_RADIUS,
       bounds: {
-        x: pos.x - 8,
-        y: pos.y - 8,
-        width: 16,
-        height: 16
+        x: pos.x - GEOMETRY.REROUTE_RADIUS,
+        y: pos.y - GEOMETRY.REROUTE_RADIUS,
+        width: GEOMETRY.REROUTE_RADIUS * 2,
+        height: GEOMETRY.REROUTE_RADIUS * 2
       }
     }
     this.updateRerouteLayout(operation.rerouteId, layout)
@@ -1216,12 +1214,12 @@ class LayoutStoreImpl implements LayoutStore {
     return {
       id: rerouteId,
       position,
-      radius: REROUTE_RADIUS,
+      radius: GEOMETRY.REROUTE_RADIUS,
       bounds: {
-        x: position.x - REROUTE_RADIUS,
-        y: position.y - REROUTE_RADIUS,
-        width: REROUTE_RADIUS * 2,
-        height: REROUTE_RADIUS * 2
+        x: position.x - GEOMETRY.REROUTE_RADIUS,
+        y: position.y - GEOMETRY.REROUTE_RADIUS,
+        width: GEOMETRY.REROUTE_RADIUS * 2,
+        height: GEOMETRY.REROUTE_RADIUS * 2
       }
     }
   }