diff --git a/src/composables/graph/useGraphNodeManager.ts b/src/composables/graph/useGraphNodeManager.ts
index 33822d1c5..3bbadfb93 100644
--- a/src/composables/graph/useGraphNodeManager.ts
+++ b/src/composables/graph/useGraphNodeManager.ts
@@ -16,6 +16,7 @@ import type {
   IWidgetOptions
 } from '@/lib/litegraph/src/types/widgets'
 import { useLayoutMutations } from '@/renderer/core/layout/operations/layoutMutations'
+import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
 import { LayoutSource } from '@/renderer/core/layout/types'
 import type { NodeId } from '@/renderer/core/layout/types'
 import type { InputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
@@ -322,7 +323,7 @@ export function extractVueNodeData(node: LGraphNode): VueNodeData {
 
 export function useGraphNodeManager(graph: LGraph): GraphNodeManager {
   // Get layout mutations composable
-  const { createNode, deleteNode, setSource } = useLayoutMutations()
+  const { createNode, deleteNode, resizeNode, setSource } = useLayoutMutations()
   // Safe reactive data extracted from LiteGraph nodes
   const vueNodeData = reactive(new Map<string, VueNodeData>())
 
@@ -396,6 +397,14 @@ export function useGraphNodeManager(graph: LGraph): GraphNodeManager {
     // Store non-reactive reference to original node
     nodeRefs.set(id, node)
 
+    // Chain onResize to propagate extension-driven size changes to the store
+    node.onResize = useChainCallback(node.onResize, (size) => {
+      const current = layoutStore.getNodeLayoutRef(id).value?.size
+      if (current?.width === size[0] && current?.height === size[1]) return
+      setSource(LayoutSource.Canvas)
+      resizeNode(id, { width: size[0], height: size[1] })
+    })
+
     // Extract initial data for Vue (may be incomplete during graph configure)
     vueNodeData.set(id, extractVueNodeData(node))
 
diff --git a/src/renderer/extensions/vueNodes/components/LGraphNode.vue b/src/renderer/extensions/vueNodes/components/LGraphNode.vue
index d602e4062..5c01e2b83 100644
--- a/src/renderer/extensions/vueNodes/components/LGraphNode.vue
+++ b/src/renderer/extensions/vueNodes/components/LGraphNode.vue
@@ -164,6 +164,7 @@ import {
   nextTick,
   onErrorCaptured,
   onMounted,
+  onUnmounted,
   ref,
   watch
 } from 'vue'
@@ -186,6 +187,7 @@ import { useTelemetry } from '@/platform/telemetry'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useCanvasInteractions } from '@/renderer/core/canvas/useCanvasInteractions'
 import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
+import { LayoutSource } from '@/renderer/core/layout/types'
 import SlotConnectionDot from '@/renderer/extensions/vueNodes/components/SlotConnectionDot.vue'
 import { useNodeEventHandlers } from '@/renderer/extensions/vueNodes/composables/useNodeEventHandlers'
 import { useNodePointerInteractions } from '@/renderer/extensions/vueNodes/composables/useNodePointerInteractions'
@@ -343,6 +345,25 @@ function initSizeStyles() {
   el.style.setProperty(`--node-height${suffix}`, `${height}px`)
 }
 
+// React to extension-driven resize operations (e.g., KJNodes spline editor)
+const unsubscribeResize = layoutStore.onChange((change) => {
+  if (change.source !== LayoutSource.Canvas) return
+  if (change.operation.type !== 'resizeNode') return
+  if (!change.nodeIds.includes(nodeData.id)) return
+  if (isCollapsed.value) return
+
+  const el = nodeContainerRef.value
+  if (!el) return
+
+  const newSize = size.value
+  el.style.setProperty('--node-width', `${newSize.width}px`)
+  el.style.setProperty('--node-height', `${newSize.height}px`)
+})
+
+onUnmounted(() => {
+  unsubscribeResize()
+})
+
 const baseResizeHandleClasses =
   'absolute h-3 w-3 opacity-0 pointer-events-auto focus-visible:outline focus-visible:outline-2 focus-visible:outline-white/40'