diff --git a/src/stores/nodeDefStore.ts b/src/stores/nodeDefStore.ts
index aaa6d000b..b92837205 100644
--- a/src/stores/nodeDefStore.ts
+++ b/src/stores/nodeDefStore.ts
@@ -251,11 +251,41 @@ export function createDummyFolderNodeDef(folderPath: string): ComfyNodeDefImpl {
   } as ComfyNodeDefV1)
 }
 
+/**
+ * Defines a filter for node definitions in the node library.
+ * Filters are applied in a single pass to determine node visibility.
+ */
+export interface NodeDefFilter {
+  /**
+   * Unique identifier for the filter.
+   * Convention: Use dot notation like 'core.deprecated' or 'extension.myfilter'
+   */
+  id: string
+
+  /**
+   * Display name for the filter (used in UI/debugging).
+   */
+  name: string
+
+  /**
+   * Optional description explaining what the filter does.
+   */
+  description?: string
+
+  /**
+   * The filter function that returns true if the node should be visible.
+   * @param nodeDef - The node definition to evaluate
+   * @returns true if the node should be visible, false to hide it
+   */
+  predicate: (nodeDef: ComfyNodeDefImpl) => boolean
+}
+
 export const useNodeDefStore = defineStore('nodeDef', () => {
   const nodeDefsByName = ref<Record<string, ComfyNodeDefImpl>>({})
   const nodeDefsByDisplayName = ref<Record<string, ComfyNodeDefImpl>>({})
   const showDeprecated = ref(false)
   const showExperimental = ref(false)
+  const nodeDefFilters = ref<NodeDefFilter[]>([])
 
   const nodeDefs = computed(() => Object.values(nodeDefsByName.value))
   const nodeDataTypes = computed(() => {
@@ -270,13 +300,11 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
     }
     return types
   })
-  const visibleNodeDefs = computed(() =>
-    nodeDefs.value.filter(
-      (nodeDef: ComfyNodeDefImpl) =>
-        (showDeprecated.value || !nodeDef.deprecated) &&
-        (showExperimental.value || !nodeDef.experimental)
+  const visibleNodeDefs = computed(() => {
+    return nodeDefs.value.filter((nodeDef) =>
+      nodeDefFilters.value.every((filter) => filter.predicate(nodeDef))
     )
-  )
+  })
   const nodeSearchService = computed(
     () => new NodeSearchService(visibleNodeDefs.value)
   )
@@ -310,11 +338,53 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
     return nodeDefsByName.value[node.constructor?.nodeData?.name] ?? null
   }
 
+  /**
+   * Registers a node definition filter.
+   * @param filter - The filter to register
+   */
+  function registerNodeDefFilter(filter: NodeDefFilter) {
+    nodeDefFilters.value = [...nodeDefFilters.value, filter]
+  }
+
+  /**
+   * Unregisters a node definition filter by ID.
+   * @param id - The ID of the filter to remove
+   */
+  function unregisterNodeDefFilter(id: string) {
+    nodeDefFilters.value = nodeDefFilters.value.filter((f) => f.id !== id)
+  }
+
+  /**
+   * Register the core node definition filters.
+   */
+  function registerCoreNodeDefFilters() {
+    // Deprecated nodes filter
+    registerNodeDefFilter({
+      id: 'core.deprecated',
+      name: 'Hide Deprecated Nodes',
+      description: 'Hides nodes marked as deprecated unless explicitly enabled',
+      predicate: (nodeDef) => showDeprecated.value || !nodeDef.deprecated
+    })
+
+    // Experimental nodes filter
+    registerNodeDefFilter({
+      id: 'core.experimental',
+      name: 'Hide Experimental Nodes',
+      description:
+        'Hides nodes marked as experimental unless explicitly enabled',
+      predicate: (nodeDef) => showExperimental.value || !nodeDef.experimental
+    })
+  }
+
+  // Register core filters on store initialization
+  registerCoreNodeDefFilters()
+
   return {
     nodeDefsByName,
     nodeDefsByDisplayName,
     showDeprecated,
     showExperimental,
+    nodeDefFilters,
 
     nodeDefs,
     nodeDataTypes,
@@ -324,7 +394,9 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
 
     updateNodeDefs,
     addNodeDef,
-    fromLGraphNode
+    fromLGraphNode,
+    registerNodeDefFilter,
+    unregisterNodeDefFilter
   }
 })
 
diff --git a/src/utils/nodeDefUtil.ts b/src/utils/nodeDefUtil.ts
index 8b130ff2d..cb8a7125b 100644
--- a/src/utils/nodeDefUtil.ts
+++ b/src/utils/nodeDefUtil.ts
@@ -15,6 +15,7 @@ import {
   isFloatInputSpec,
   isIntInputSpec
 } from '@/schemas/nodeDefSchema'
+import type { ComfyNodeDefImpl } from '@/stores/nodeDefStore'
 
 import { lcm } from './mathUtil'
 
@@ -138,3 +139,11 @@ export const mergeInputSpec = (
 
   return mergeCommonInputSpec(spec1, spec2)
 }
+
+/**
+ * Checks if a node definition represents a subgraph node.
+ * Subgraph nodes are created with category='subgraph' and python_module='nodes'.
+ */
+export const isSubgraphNode = (nodeDef: ComfyNodeDefImpl): boolean => {
+  return nodeDef.category === 'subgraph' && nodeDef.python_module === 'nodes'
+}
diff --git a/tests-ui/tests/store/nodeDefStore.test.ts b/tests-ui/tests/store/nodeDefStore.test.ts
new file mode 100644
index 000000000..068bf1c0c
--- /dev/null
+++ b/tests-ui/tests/store/nodeDefStore.test.ts
@@ -0,0 +1,269 @@
+import { createPinia, setActivePinia } from 'pinia'
+import { beforeEach, describe, expect, it } from 'vitest'
+
+import type { ComfyNodeDef } from '@/schemas/nodeDefSchema'
+import { type NodeDefFilter, useNodeDefStore } from '@/stores/nodeDefStore'
+
+describe('useNodeDefStore', () => {
+  let store: ReturnType<typeof useNodeDefStore>
+
+  beforeEach(() => {
+    setActivePinia(createPinia())
+    store = useNodeDefStore()
+  })
+
+  const createMockNodeDef = (
+    overrides: Partial<ComfyNodeDef> = {}
+  ): ComfyNodeDef => ({
+    name: 'TestNode',
+    display_name: 'Test Node',
+    category: 'test',
+    python_module: 'test_module',
+    description: 'Test node',
+    input: {},
+    output: [],
+    output_is_list: [],
+    output_name: [],
+    output_node: false,
+    deprecated: false,
+    experimental: false,
+    ...overrides
+  })
+
+  describe('filter registry', () => {
+    it('should register a new filter', () => {
+      const filter: NodeDefFilter = {
+        id: 'test.filter',
+        name: 'Test Filter',
+        predicate: () => true
+      }
+
+      store.registerNodeDefFilter(filter)
+      expect(store.nodeDefFilters).toContainEqual(filter)
+    })
+
+    it('should unregister a filter by id', () => {
+      const filter: NodeDefFilter = {
+        id: 'test.filter',
+        name: 'Test Filter',
+        predicate: () => true
+      }
+
+      store.registerNodeDefFilter(filter)
+      store.unregisterNodeDefFilter('test.filter')
+      expect(store.nodeDefFilters).not.toContainEqual(filter)
+    })
+
+    it('should register core filters on initialization', () => {
+      const deprecatedFilter = store.nodeDefFilters.find(
+        (f) => f.id === 'core.deprecated'
+      )
+      const experimentalFilter = store.nodeDefFilters.find(
+        (f) => f.id === 'core.experimental'
+      )
+
+      expect(deprecatedFilter).toBeDefined()
+      expect(experimentalFilter).toBeDefined()
+    })
+  })
+
+  describe('filter application', () => {
+    beforeEach(() => {
+      // Clear existing filters for isolated tests
+      store.nodeDefFilters.splice(0)
+    })
+
+    it('should apply single filter to visible nodes', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        deprecated: false
+      })
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+
+      store.updateNodeDefs([normalNode, deprecatedNode])
+
+      // Register filter that hides deprecated nodes
+      store.registerNodeDefFilter({
+        id: 'test.no-deprecated',
+        name: 'Hide Deprecated',
+        predicate: (node) => !node.deprecated
+      })
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should apply multiple filters with AND logic', () => {
+      const node1 = createMockNodeDef({
+        name: 'node1',
+        deprecated: false,
+        experimental: false
+      })
+      const node2 = createMockNodeDef({
+        name: 'node2',
+        deprecated: true,
+        experimental: false
+      })
+      const node3 = createMockNodeDef({
+        name: 'node3',
+        deprecated: false,
+        experimental: true
+      })
+      const node4 = createMockNodeDef({
+        name: 'node4',
+        deprecated: true,
+        experimental: true
+      })
+
+      store.updateNodeDefs([node1, node2, node3, node4])
+
+      // Register filters
+      store.registerNodeDefFilter({
+        id: 'test.no-deprecated',
+        name: 'Hide Deprecated',
+        predicate: (node) => !node.deprecated
+      })
+
+      store.registerNodeDefFilter({
+        id: 'test.no-experimental',
+        name: 'Hide Experimental',
+        predicate: (node) => !node.experimental
+      })
+
+      // Only node1 should be visible (not deprecated AND not experimental)
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('node1')
+    })
+
+    it('should show all nodes when no filters are registered', () => {
+      const nodes = [
+        createMockNodeDef({ name: 'node1' }),
+        createMockNodeDef({ name: 'node2' }),
+        createMockNodeDef({ name: 'node3' })
+      ]
+
+      store.updateNodeDefs(nodes)
+      expect(store.visibleNodeDefs).toHaveLength(3)
+    })
+
+    it('should update visibility when filter is removed', () => {
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+      store.updateNodeDefs([deprecatedNode])
+
+      const filter: NodeDefFilter = {
+        id: 'test.no-deprecated',
+        name: 'Hide Deprecated',
+        predicate: (node) => !node.deprecated
+      }
+
+      // Add filter - node should be hidden
+      store.registerNodeDefFilter(filter)
+      expect(store.visibleNodeDefs).toHaveLength(0)
+
+      // Remove filter - node should be visible
+      store.unregisterNodeDefFilter('test.no-deprecated')
+      expect(store.visibleNodeDefs).toHaveLength(1)
+    })
+  })
+
+  describe('core filters behavior', () => {
+    it('should hide deprecated nodes by default', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        deprecated: false
+      })
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+
+      store.updateNodeDefs([normalNode, deprecatedNode])
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should show deprecated nodes when showDeprecated is true', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        deprecated: false
+      })
+      const deprecatedNode = createMockNodeDef({
+        name: 'deprecated',
+        deprecated: true
+      })
+
+      store.updateNodeDefs([normalNode, deprecatedNode])
+      store.showDeprecated = true
+
+      expect(store.visibleNodeDefs).toHaveLength(2)
+    })
+
+    it('should hide experimental nodes by default', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        experimental: false
+      })
+      const experimentalNode = createMockNodeDef({
+        name: 'experimental',
+        experimental: true
+      })
+
+      store.updateNodeDefs([normalNode, experimentalNode])
+
+      expect(store.visibleNodeDefs).toHaveLength(1)
+      expect(store.visibleNodeDefs[0].name).toBe('normal')
+    })
+
+    it('should show experimental nodes when showExperimental is true', () => {
+      const normalNode = createMockNodeDef({
+        name: 'normal',
+        experimental: false
+      })
+      const experimentalNode = createMockNodeDef({
+        name: 'experimental',
+        experimental: true
+      })
+
+      store.updateNodeDefs([normalNode, experimentalNode])
+      store.showExperimental = true
+
+      expect(store.visibleNodeDefs).toHaveLength(2)
+    })
+  })
+
+  describe('performance', () => {
+    it('should perform single traversal for multiple filters', () => {
+      let filterCallCount = 0
+
+      // Register multiple filters that count their calls
+      for (let i = 0; i < 5; i++) {
+        store.registerNodeDefFilter({
+          id: `test.counter-${i}`,
+          name: `Counter ${i}`,
+          predicate: () => {
+            filterCallCount++
+            return true
+          }
+        })
+      }
+
+      const nodes = Array.from({ length: 10 }, (_, i) =>
+        createMockNodeDef({ name: `node${i}` })
+      )
+      store.updateNodeDefs(nodes)
+
+      // Force recomputation by accessing visibleNodeDefs
+      expect(store.visibleNodeDefs).toBeDefined()
+
+      // Each node (10) should be checked by each filter (5 test + 2 core = 7 total)
+      expect(filterCallCount).toBe(10 * 5)
+    })
+  })
+})