diff --git a/web/app/components/workflow/hooks/use-nodes-interactions.ts b/web/app/components/workflow/hooks/use-nodes-interactions.ts
index a4372aef32..1835096533 100644
--- a/web/app/components/workflow/hooks/use-nodes-interactions.ts
+++ b/web/app/components/workflow/hooks/use-nodes-interactions.ts
@@ -52,6 +52,7 @@ import {
   getNodeCustomTypeByNodeDataType,
   getNodesConnectedSourceOrTargetHandleIdsMap,
   getTopLeftNodePosition,
+  parseNestedNodeId,
 } from '../utils'
 import { useWorkflowHistoryStore } from '../workflow-history-store'
 import { useAutoGenerateWebhookUrl } from './use-auto-generate-webhook-url'
@@ -350,13 +351,9 @@ export const useNodesInteractions = () => {
   }, [configsMap?.flowId])
 
   const cleanupContextGenStorage = useCallback((nodeId: string, nodeData?: Node['data']) => {
-    const extSeparator = '_ext_'
-    const extIndex = nodeId.indexOf(extSeparator)
-    if (extIndex > 0) {
-      const toolNodeId = nodeId.slice(0, extIndex)
-      const paramKey = nodeId.slice(extIndex + extSeparator.length)
-      clearContextGenStorageByParam(toolNodeId, paramKey)
-    }
+    const parsed = parseNestedNodeId(nodeId)
+    if (parsed)
+      clearContextGenStorageByParam(parsed.parentId, parsed.paramKey)
 
     if (nodeData?.type !== BlockEnum.Tool)
       return
diff --git a/web/app/components/workflow/nodes/_base/components/code-generator-button.tsx b/web/app/components/workflow/nodes/_base/components/code-generator-button.tsx
index df5cb55b79..e65a3d431d 100644
--- a/web/app/components/workflow/nodes/_base/components/code-generator-button.tsx
+++ b/web/app/components/workflow/nodes/_base/components/code-generator-button.tsx
@@ -14,6 +14,7 @@ import { cn } from '@/utils/classnames'
 import { useHooksStore } from '../../../hooks-store'
 import { useStore } from '../../../store'
 import { BlockEnum } from '../../../types'
+import { parseNestedNodeId } from '../../../utils'
 import ContextGenerateModal from '../../tool/components/context-generate-modal'
 
 type Props = {
@@ -40,23 +41,11 @@ const CodeGenerateBtn: FC<Props> = ({
   }, [onGenerated, showAutomaticFalse])
   const configsMap = useHooksStore(s => s.configsMap)
 
-  const parseExtractorNodeId = useCallback((id: string) => {
-    const marker = '_ext_'
-    const index = id.lastIndexOf(marker)
-    if (index < 0)
-      return null
-    const parentId = id.slice(0, index)
-    const paramKey = id.slice(index + marker.length)
-    if (!parentId || !paramKey)
-      return null
-    return { parentId, paramKey }
-  }, [])
-
   const contextGenerateConfig = useMemo(() => {
     const targetNode = nodes.find(node => node.id === nodeId)
     const isCodeNode = targetNode?.data?.type === BlockEnum.Code
     const parentNodeId = (targetNode?.data as { parent_node_id?: string })?.parent_node_id
-    const parsed = parseExtractorNodeId(nodeId)
+    const parsed = parseNestedNodeId(nodeId)
     if (!isCodeNode || !parentNodeId || !parsed?.paramKey)
       return null
     return {
@@ -64,7 +53,7 @@ const CodeGenerateBtn: FC<Props> = ({
       paramKey: parsed.paramKey,
       codeNodeId: nodeId,
     }
-  }, [nodeId, nodes, parseExtractorNodeId])
+  }, [nodeId, nodes])
 
   const handleOpenAutomatic = useCallback(() => {
     showAutomaticTrue()
diff --git a/web/app/components/workflow/utils/index.ts b/web/app/components/workflow/utils/index.ts
index 3fd8e5d604..5445144696 100644
--- a/web/app/components/workflow/utils/index.ts
+++ b/web/app/components/workflow/utils/index.ts
@@ -3,6 +3,7 @@ export * from './data-source'
 export * from './edge'
 export * from './elk-layout'
 export * from './gen-node-meta-data'
+export * from './nested-node-id'
 export * from './node'
 export * from './tool'
 export * from './tool-token'
diff --git a/web/app/components/workflow/utils/nested-node-id.ts b/web/app/components/workflow/utils/nested-node-id.ts
new file mode 100644
index 0000000000..890a98c49c
--- /dev/null
+++ b/web/app/components/workflow/utils/nested-node-id.ts
@@ -0,0 +1,27 @@
+export const NESTED_NODE_SEPARATOR = '_ext_'
+
+export type NestedNodeIdParts = {
+  parentId: string
+  paramKey: string
+}
+
+export const buildNestedNodeId = (parentId: string, paramKey: string) => {
+  if (!parentId || !paramKey)
+    return ''
+  return `${parentId}${NESTED_NODE_SEPARATOR}${paramKey}`
+}
+
+export const parseNestedNodeId = (id?: string): NestedNodeIdParts | null => {
+  if (!id)
+    return null
+  const index = id.lastIndexOf(NESTED_NODE_SEPARATOR)
+  if (index <= 0)
+    return null
+  const parentId = id.slice(0, index)
+  const paramKey = id.slice(index + NESTED_NODE_SEPARATOR.length)
+  if (!parentId || !paramKey)
+    return null
+  return { parentId, paramKey }
+}
+
+export const isNestedNodeId = (id?: string) => Boolean(parseNestedNodeId(id))