diff --git a/web/app/components/base/prompt-editor/__tests__/index.spec.tsx b/web/app/components/base/prompt-editor/__tests__/index.spec.tsx
index e8d7bc716f..e8bc8194c6 100644
--- a/web/app/components/base/prompt-editor/__tests__/index.spec.tsx
+++ b/web/app/components/base/prompt-editor/__tests__/index.spec.tsx
@@ -365,6 +365,22 @@ describe('PromptEditor', () => {
       expect(() => unmount()).not.toThrow()
     })
 
+    it('should rerender rapidly without triggering a ref update loop', () => {
+      const { rerender } = render(
+        <React.StrictMode>
+          <PromptEditor value="first" />
+        </React.StrictMode>,
+      )
+
+      expect(() => {
+        rerender(
+          <React.StrictMode>
+            <PromptEditor value="second" />
+          </React.StrictMode>,
+        )
+      }).not.toThrow()
+    })
+
     it('should render hitl block when show=true', () => {
       render(
         <PromptEditor
diff --git a/web/app/components/base/prompt-editor/index.tsx b/web/app/components/base/prompt-editor/index.tsx
index a1490e77cd..b8ab33087a 100644
--- a/web/app/components/base/prompt-editor/index.tsx
+++ b/web/app/components/base/prompt-editor/index.tsx
@@ -38,7 +38,7 @@ import {
   TextNode,
 } from 'lexical'
 import * as React from 'react'
-import { useEffect, useState } from 'react'
+import { useCallback, useEffect, useState } from 'react'
 import { WorkflowContext } from '@/app/components/workflow/context'
 import { HooksStoreContext } from '@/app/components/workflow/hooks-store/provider'
 import { FileReferenceNode } from '@/app/components/workflow/skill/editor/skill-editor/plugins/file-reference-block/node'
@@ -344,10 +344,12 @@ const PromptEditorContent: FC<PromptEditorContentProps> = ({
 
   const [floatingAnchorElem, setFloatingAnchorElem] = useState<HTMLDivElement | null>(null)
 
-  const onRef = (floatingAnchorElement: HTMLDivElement | null) => {
-    if (floatingAnchorElement !== null)
-      setFloatingAnchorElem(floatingAnchorElement)
-  }
+  const onRef = useCallback((floatingAnchorElement: HTMLDivElement | null) => {
+    if (floatingAnchorElement === null)
+      return
+
+    setFloatingAnchorElem(prev => prev === floatingAnchorElement ? prev : floatingAnchorElement)
+  }, [])
 
   return (
     <LexicalComposer initialConfig={{ ...initialConfig, editable }}>
diff --git a/web/app/components/workflow-app/__tests__/index.spec.tsx b/web/app/components/workflow-app/__tests__/index.spec.tsx
index edba570fd6..d2c1246343 100644
--- a/web/app/components/workflow-app/__tests__/index.spec.tsx
+++ b/web/app/components/workflow-app/__tests__/index.spec.tsx
@@ -19,6 +19,7 @@ const mockUseSubscription = vi.fn()
 const mockCollaborationSetNodes = vi.fn()
 const mockCollaborationSetEdges = vi.fn()
 const mockEmitGraphViewActive = vi.fn()
+const mockUseCollaboration = vi.fn()
 
 let appStoreState: {
   appDetail?: {
@@ -63,6 +64,8 @@ let searchParamsValue: string | null = null
 const workflowUiState = {
   appId: 'app-1',
   isResponding: false,
+  isRestoring: false,
+  historyWorkflowData: undefined as Record<string, unknown> | undefined,
   showUpgradeRuntimeModal: false,
   setShowUpgradeRuntimeModal: mockSetShowUpgradeRuntimeModal,
 }
@@ -145,7 +148,7 @@ vi.mock('@/context/event-emitter', () => ({
 }))
 
 vi.mock('@/app/components/workflow/collaboration', () => ({
-  useCollaboration: () => undefined,
+  useCollaboration: (...args: unknown[]) => mockUseCollaboration(...args),
 }))
 
 vi.mock('@/app/components/workflow/collaboration/core/collaboration-manager', () => ({
@@ -293,6 +296,8 @@ describe('WorkflowApp', () => {
     mockInitialEdges.mockReturnValue([{ id: 'edge-1' }])
     mockGetWorkflowRunAndTraceUrl.mockReturnValue({ runUrl: '/runs/run-1' })
     mockSyncWorkflowDraftImmediately.mockResolvedValue(undefined)
+    workflowUiState.isRestoring = false
+    workflowUiState.historyWorkflowData = undefined
   })
 
   it('should render the loading shell while workflow data is still loading', () => {
@@ -427,4 +432,27 @@ describe('WorkflowApp', () => {
     expect(mockSetShowInputsPanel).not.toHaveBeenCalled()
     expect(mockSetShowDebugAndPreviewPanel).not.toHaveBeenCalled()
   })
+
+  it.each([
+    {
+      description: 'the workflow is restoring',
+      workflowState: {
+        isRestoring: true,
+        historyWorkflowData: undefined,
+      },
+    },
+    {
+      description: 'a historical workflow version is selected',
+      workflowState: {
+        isRestoring: false,
+        historyWorkflowData: { id: 'history-1' },
+      },
+    },
+  ])('should disable the collaboration session when $description', ({ workflowState }) => {
+    Object.assign(workflowUiState, workflowState)
+
+    render(<WorkflowApp />)
+
+    expect(mockUseCollaboration).toHaveBeenCalledWith('app-1', undefined, false)
+  })
 })
diff --git a/web/app/components/workflow-app/components/__tests__/workflow-main.spec.tsx b/web/app/components/workflow-app/components/__tests__/workflow-main.spec.tsx
index af17db7bff..331032ed98 100644
--- a/web/app/components/workflow-app/components/__tests__/workflow-main.spec.tsx
+++ b/web/app/components/workflow-app/components/__tests__/workflow-main.spec.tsx
@@ -14,9 +14,12 @@ const mockGetNodes = vi.fn()
 const mockSetNodes = vi.fn()
 const mockGetEdges = vi.fn()
 const mockSetEdges = vi.fn()
+const mockUseCollaboration = vi.fn()
 
 const workflowUiState = {
   appId: 'app-1',
+  isRestoring: false,
+  historyWorkflowData: undefined as Record<string, unknown> | undefined,
 }
 
 const hookFns = {
@@ -97,14 +100,17 @@ vi.mock('@/app/components/workflow/collaboration', () => ({
     onWorkflowUpdate: vi.fn(() => vi.fn()),
     onSyncRequest: vi.fn(() => vi.fn()),
   },
-  useCollaboration: () => ({
-    startCursorTracking: mockStartCursorTracking,
-    stopCursorTracking: mockStopCursorTracking,
-    onlineUsers: [],
-    cursors: {},
-    isConnected: false,
-    isEnabled: false,
-  }),
+  useCollaboration: (...args: unknown[]) => {
+    mockUseCollaboration(...args)
+    return {
+      startCursorTracking: mockStartCursorTracking,
+      stopCursorTracking: mockStopCursorTracking,
+      onlineUsers: [],
+      cursors: {},
+      isConnected: false,
+      isEnabled: false,
+    }
+  },
 }))
 
 vi.mock('@/app/components/workflow/block-selector/context/mcp-tool-availability-context', () => ({
@@ -215,6 +221,8 @@ describe('WorkflowMain', () => {
     capturedContextProps = null
     mockGetNodes.mockReturnValue([])
     mockGetEdges.mockReturnValue([])
+    workflowUiState.isRestoring = false
+    workflowUiState.historyWorkflowData = undefined
   })
 
   it('should render the inner workflow context with children and forwarded graph props', () => {
@@ -331,4 +339,39 @@ describe('WorkflowMain', () => {
       configsMap: { flowId: 'app-1', flowType: 'app-flow', fileSettings: { enabled: true } },
     })
   })
+
+  it.each([
+    {
+      description: 'the workflow is restoring',
+      workflowState: {
+        isRestoring: true,
+        historyWorkflowData: undefined,
+      },
+    },
+    {
+      description: 'viewing workflow history',
+      workflowState: {
+        isRestoring: false,
+        historyWorkflowData: { id: 'history-1' },
+      },
+    },
+  ])('should disable collaboration when $description', ({ workflowState }) => {
+    Object.assign(workflowUiState, workflowState)
+
+    render(
+      <WorkflowMain
+        nodes={[]}
+        edges={[]}
+        viewport={{ x: 0, y: 0, zoom: 1 }}
+      />,
+    )
+
+    expect(mockUseCollaboration).toHaveBeenCalledWith(
+      'app-1',
+      expect.objectContaining({
+        getState: expect.any(Function),
+      }),
+      false,
+    )
+  })
 })
diff --git a/web/app/components/workflow-app/components/workflow-main.tsx b/web/app/components/workflow-app/components/workflow-main.tsx
index 59476544e0..09d543dc58 100644
--- a/web/app/components/workflow-app/components/workflow-main.tsx
+++ b/web/app/components/workflow-app/components/workflow-main.tsx
@@ -50,6 +50,7 @@ const WorkflowMain = ({
   const featuresStore = useFeaturesStore()
   const workflowStore = useWorkflowStore()
   const appId = useStore(s => s.appId)
+  const isWorkflowCollaborationEnabled = useStore(s => !s.isRestoring && !s.historyWorkflowData)
   const containerRef = useRef<HTMLDivElement>(null)
   const reactFlow = useReactFlow()
 
@@ -68,7 +69,7 @@ const WorkflowMain = ({
     cursors,
     isConnected,
     isEnabled: isCollaborationEnabled,
-  } = useCollaboration(appId || '', reactFlowStore)
+  } = useCollaboration(appId || '', reactFlowStore, isWorkflowCollaborationEnabled)
   const myUserId = useMemo(
     () => (isCollaborationEnabled && isConnected ? 'current-user' : null),
     [isCollaborationEnabled, isConnected],
diff --git a/web/app/components/workflow-app/index.tsx b/web/app/components/workflow-app/index.tsx
index cfab038e18..be92ca7a82 100644
--- a/web/app/components/workflow-app/index.tsx
+++ b/web/app/components/workflow-app/index.tsx
@@ -65,7 +65,8 @@ const SkillMain = dynamic(() => import('@/app/components/workflow/skill/main'),
 
 const CollaborationSession = () => {
   const appId = useStore(s => s.appId)
-  useCollaboration(appId || '')
+  const isCollaborationSessionEnabled = useStore(s => !s.isRestoring && !s.historyWorkflowData)
+  useCollaboration(appId || '', undefined, isCollaborationSessionEnabled)
   return null
 }
 
diff --git a/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.connect.spec.ts b/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.connect.spec.ts
new file mode 100644
index 0000000000..aabb83a749
--- /dev/null
+++ b/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.connect.spec.ts
@@ -0,0 +1,123 @@
+import { CollaborationManager } from '../collaboration-manager'
+
+const mocks = vi.hoisted(() => {
+  const socket = {
+    connected: false,
+    emit: vi.fn(),
+    id: 'socket-1',
+    off: vi.fn(),
+    on: vi.fn(),
+  }
+
+  return {
+    connectSocket: vi.fn(() => socket),
+    disconnectSocket: vi.fn(),
+    emitWithAuthGuard: vi.fn(),
+    getSocket: vi.fn(() => socket),
+    initLoro: vi.fn<() => Promise<void>>(),
+    isConnected: vi.fn(() => false),
+    LoroDoc: vi.fn(function MockLoroDoc(this: { getMap: ReturnType<typeof vi.fn> }) {
+      this.getMap = vi.fn(() => ({
+        get: vi.fn(),
+        keys: vi.fn(() => []),
+        subscribe: vi.fn(),
+        values: vi.fn(() => []),
+      }))
+    }),
+    providerDestroy: vi.fn(),
+    UndoManager: vi.fn(function MockUndoManager(this: { canRedo: ReturnType<typeof vi.fn>, canUndo: ReturnType<typeof vi.fn> }) {
+      this.canRedo = vi.fn(() => false)
+      this.canUndo = vi.fn(() => false)
+    }),
+  }
+})
+
+vi.mock('../loro-web', () => ({
+  default: () => mocks.initLoro(),
+  LoroDoc: mocks.LoroDoc,
+  LoroList: class {},
+  LoroMap: class {},
+  UndoManager: mocks.UndoManager,
+}))
+
+vi.mock('../crdt-provider', () => ({
+  CRDTProvider: vi.fn(function MockCRDTProvider(this: { destroy: typeof mocks.providerDestroy }) {
+    this.destroy = mocks.providerDestroy
+  }),
+}))
+
+vi.mock('../websocket-manager', () => ({
+  emitWithAuthGuard: (...args: unknown[]) => mocks.emitWithAuthGuard(...args),
+  webSocketClient: {
+    connect: mocks.connectSocket,
+    disconnect: (appId?: string) => mocks.disconnectSocket(appId),
+    getSocket: mocks.getSocket,
+    isConnected: mocks.isConnected,
+  },
+}))
+
+type CollaborationManagerInternals = {
+  activeConnections: Set<string>
+  connectionInitializationPromise: Promise<void> | null
+  currentAppId: string | null
+  doc: unknown
+}
+
+const getManagerInternals = (manager: CollaborationManager): CollaborationManagerInternals =>
+  manager as unknown as CollaborationManagerInternals
+
+const createDeferred = () => {
+  let resolve!: () => void
+  const promise = new Promise<void>((res) => {
+    resolve = res
+  })
+
+  return {
+    promise,
+    resolve,
+  }
+}
+
+// Covers Loro wasm bootstrapping during workflow collaboration startup.
+describe('CollaborationManager connect', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mocks.initLoro.mockResolvedValue(undefined)
+  })
+
+  it('should rollback connection state when Loro initialization fails', async () => {
+    const manager = new CollaborationManager()
+    const internals = getManagerInternals(manager)
+    const initError = new Error('init failed')
+    mocks.initLoro.mockRejectedValueOnce(initError)
+
+    await expect(manager.connect('app-1')).rejects.toThrow(initError)
+
+    expect(mocks.connectSocket).toHaveBeenCalledWith('app-1')
+    expect(mocks.disconnectSocket).toHaveBeenCalledWith('app-1')
+    expect(mocks.LoroDoc).not.toHaveBeenCalled()
+    expect(internals.currentAppId).toBeNull()
+    expect(internals.doc).toBeNull()
+    expect(internals.connectionInitializationPromise).toBeNull()
+    expect(internals.activeConnections.size).toBe(0)
+  })
+
+  it('should reuse the in-flight initialization for concurrent callers', async () => {
+    const manager = new CollaborationManager()
+    const deferred = createDeferred()
+    mocks.initLoro.mockReturnValueOnce(deferred.promise)
+
+    const firstConnect = manager.connect('app-1')
+    const secondConnect = manager.connect('app-1')
+
+    expect(mocks.initLoro).toHaveBeenCalledTimes(1)
+    expect(mocks.connectSocket).toHaveBeenCalledTimes(1)
+
+    deferred.resolve()
+
+    await expect(firstConnect).resolves.toMatch(/[a-z0-9]{9}/)
+    await expect(secondConnect).resolves.toMatch(/[a-z0-9]{9}/)
+    expect(mocks.LoroDoc).toHaveBeenCalledTimes(1)
+    expect(mocks.UndoManager).toHaveBeenCalledTimes(1)
+  })
+})
diff --git a/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.merge-behavior.test.ts b/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.merge-behavior.test.ts
index 93d1c6b746..819e843b7c 100644
--- a/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.merge-behavior.test.ts
+++ b/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.merge-behavior.test.ts
@@ -1,8 +1,8 @@
-import type { LoroMap } from 'loro-crdt'
+import type { LoroDocInstance, LoroMapInstance } from '../loro-web'
 import type { Node } from '@/app/components/workflow/types'
-import { LoroDoc } from 'loro-crdt'
 import { BlockEnum } from '@/app/components/workflow/types'
 import { CollaborationManager } from '../collaboration-manager'
+import initLoro, { LoroDoc } from '../loro-web'
 
 const NODE_ID = 'node-1'
 const LLM_NODE_ID = 'llm-node'
@@ -74,9 +74,9 @@ type ParameterExtractorNodeData = {
 }
 
 type CollaborationManagerInternals = {
-  doc: LoroDoc
-  nodesMap: LoroMap
-  edgesMap: LoroMap
+  doc: LoroDocInstance
+  nodesMap: LoroMapInstance
+  edgesMap: LoroMapInstance
   syncNodes: (oldNodes: Node[], newNodes: Node[]) => void
 }
 
@@ -159,7 +159,7 @@ const createParameterExtractorNode = (parameters: ParameterItem[]): Node<Paramet
 const getManagerInternals = (manager: CollaborationManager): CollaborationManagerInternals =>
   manager as unknown as CollaborationManagerInternals
 
-const getManager = (doc: LoroDoc) => {
+const getManager = (doc: LoroDocInstance) => {
   const manager = new CollaborationManager()
   const internals = getManagerInternals(manager)
   internals.doc = doc
@@ -177,6 +177,10 @@ const syncNodes = (manager: CollaborationManager, previous: Node[], next: Node[]
 
 const exportNodes = (manager: CollaborationManager) => manager.getNodes()
 
+beforeAll(async () => {
+  await initLoro()
+})
+
 describe('Loro merge behavior smoke test', () => {
   it('inspects concurrent edits after merge', () => {
     const docA = new LoroDoc()
diff --git a/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.test.ts b/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.test.ts
index 1728bcad55..4f4cb0e798 100644
--- a/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.test.ts
+++ b/web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.test.ts
@@ -1,13 +1,13 @@
-import type { LoroMap } from 'loro-crdt'
+import type { LoroDocInstance, LoroMapInstance } from '../loro-web'
 import type {
   NodePanelPresenceMap,
   NodePanelPresenceUser,
 } from '@/app/components/workflow/collaboration/types/collaboration'
 import type { CommonNodeType, Edge, Node } from '@/app/components/workflow/types'
-import { LoroDoc } from 'loro-crdt'
 import { Position } from 'reactflow'
 import { CollaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
 import { BlockEnum } from '@/app/components/workflow/types'
+import initLoro, { LoroDoc } from '../loro-web'
 
 const NODE_ID = '1760342909316'
 
@@ -88,12 +88,12 @@ type LLMNodeDataWithUnknownTemplate = Omit<LLMNodeData, 'prompt_template'> & {
   prompt_template: unknown
 }
 
-type ManagerDoc = LoroDoc | { commit: () => void }
+type ManagerDoc = LoroDocInstance | { commit: () => void }
 
 type CollaborationManagerInternals = {
   doc: ManagerDoc
-  nodesMap: LoroMap
-  edgesMap: LoroMap
+  nodesMap: LoroMapInstance
+  edgesMap: LoroMapInstance
   syncNodes: (oldNodes: Node[], newNodes: Node[]) => void
   syncEdges: (oldEdges: Edge[], newEdges: Edge[]) => void
   applyNodePanelPresenceUpdate: (update: NodePanelPresenceEventData) => void
@@ -246,6 +246,10 @@ const setupManager = (): { manager: CollaborationManager, internals: Collaborati
   return { manager, internals }
 }
 
+beforeAll(async () => {
+  await initLoro()
+})
+
 describe('CollaborationManager syncNodes', () => {
   let manager: CollaborationManager
   let internals: CollaborationManagerInternals
diff --git a/web/app/components/workflow/collaboration/core/collaboration-manager.ts b/web/app/components/workflow/collaboration/core/collaboration-manager.ts
index ba84d6ea2a..29edb6bb14 100644
--- a/web/app/components/workflow/collaboration/core/collaboration-manager.ts
+++ b/web/app/components/workflow/collaboration/core/collaboration-manager.ts
@@ -1,4 +1,3 @@
-import type { Value } from 'loro-crdt'
 import type { Socket } from 'socket.io-client'
 import type {
   CommonNodeType,
@@ -16,11 +15,18 @@ import type {
   RestoreIntentData,
   RestoreRequestData,
 } from '../types/collaboration'
+import type {
+  LoroDocInstance,
+  LoroListInstance,
+  LoroMapInstance,
+  UndoManagerInstance,
+  Value,
+} from './loro-web'
 import { cloneDeep } from 'es-toolkit/object'
 import { isEqual } from 'es-toolkit/predicate'
-import { LoroDoc, LoroList, LoroMap, UndoManager } from 'loro-crdt'
 import { CRDTProvider } from './crdt-provider'
 import { EventEmitter } from './event-emitter'
+import initLoro, { LoroDoc, LoroList, LoroMap, UndoManager } from './loro-web'
 import { emitWithAuthGuard, webSocketClient } from './websocket-manager'
 
 type NodePanelPresenceEventData = {
@@ -105,12 +111,28 @@ const SET_NODES_ANOMALY_LOG_LIMIT = 100
 
 const toLoroValue = (value: unknown): Value => cloneDeep(value) as Value
 const toLoroRecord = (value: unknown): Record<string, Value> => cloneDeep(value) as Record<string, Value>
+
+let loroInitializationPromise: Promise<void> | null = null
+
+const ensureLoroReady = async (): Promise<void> => {
+  if (!loroInitializationPromise) {
+    loroInitializationPromise = Promise.resolve(initLoro())
+      .then(() => undefined)
+      .catch((error) => {
+        loroInitializationPromise = null
+        throw error
+      })
+  }
+
+  await loroInitializationPromise
+}
+
 export class CollaborationManager {
-  private doc: LoroDoc | null = null
-  private undoManager: UndoManager | null = null
+  private doc: LoroDocInstance | null = null
+  private undoManager: UndoManagerInstance | null = null
   private provider: CRDTProvider | null = null
-  private nodesMap: LoroMap<Record<string, Value>> | null = null
-  private edgesMap: LoroMap<Record<string, Value>> | null = null
+  private nodesMap: LoroMapInstance<Record<string, Value>> | null = null
+  private edgesMap: LoroMapInstance<Record<string, Value>> | null = null
   private eventEmitter = new EventEmitter()
   private currentAppId: string | null = null
   private reactFlowStore: ReactFlowStore | null = null
@@ -127,6 +149,7 @@ export class CollaborationManager {
   private graphViewActive: boolean | null = null
   private graphImportLogs: GraphImportLogEntry[] = []
   private setNodesAnomalyLogs: SetNodesAnomalyLogEntry[] = []
+  private connectionInitializationPromise: Promise<void> | null = null
   private pendingImportLog: {
     timestamp: number
     sources: Set<'nodes' | 'edges'>
@@ -191,13 +214,13 @@ export class CollaborationManager {
     emitWithAuthGuard(socket, 'graph_event', payload, { onUnauthorized: this.handleSessionUnauthorized })
   }
 
-  private getNodeContainer(nodeId: string): LoroMap<Record<string, Value>> {
+  private getNodeContainer(nodeId: string): LoroMapInstance<Record<string, Value>> {
     if (!this.nodesMap)
       throw new Error('Nodes map not initialized')
 
     let container = this.nodesMap.get(nodeId) as unknown
 
-    const isMapContainer = (value: unknown): value is LoroMap<Record<string, Value>> & LoroContainer => {
+    const isMapContainer = (value: unknown): value is LoroMapInstance<Record<string, Value>> & LoroContainer => {
       return !!value && typeof (value as LoroContainer).kind === 'function' && (value as LoroContainer).kind?.() === 'Map'
     }
 
@@ -207,27 +230,27 @@ export class CollaborationManager {
       const attached = (newContainer as LoroContainer).getAttached?.() ?? newContainer
       container = attached
       if (previousValue && typeof previousValue === 'object')
-        this.populateNodeContainer(container as LoroMap<Record<string, Value>>, previousValue as Node)
+        this.populateNodeContainer(container as LoroMapInstance<Record<string, Value>>, previousValue as Node)
     }
     else {
       const attached = (container as LoroContainer).getAttached?.() ?? container
       container = attached
     }
 
-    return container as LoroMap<Record<string, Value>>
+    return container as LoroMapInstance<Record<string, Value>>
   }
 
-  private ensureDataContainer(nodeContainer: LoroMap<Record<string, Value>>): LoroMap<Record<string, Value>> {
+  private ensureDataContainer(nodeContainer: LoroMapInstance<Record<string, Value>>): LoroMapInstance<Record<string, Value>> {
     let dataContainer = nodeContainer.get('data') as unknown
 
     if (!dataContainer || typeof (dataContainer as LoroContainer).kind !== 'function' || (dataContainer as LoroContainer).kind?.() !== 'Map')
       dataContainer = nodeContainer.setContainer('data', new LoroMap())
 
     const attached = (dataContainer as LoroContainer).getAttached?.() ?? dataContainer
-    return attached as LoroMap<Record<string, Value>>
+    return attached as LoroMapInstance<Record<string, Value>>
   }
 
-  private ensureList(nodeContainer: LoroMap<Record<string, Value>>, key: string): LoroList<unknown> {
+  private ensureList(nodeContainer: LoroMapInstance<Record<string, Value>>, key: string): LoroListInstance<unknown> {
     const dataContainer = this.ensureDataContainer(nodeContainer)
     let list = dataContainer.get(key) as unknown
 
@@ -235,7 +258,7 @@ export class CollaborationManager {
       list = dataContainer.setContainer(key, new LoroList())
 
     const attached = (list as LoroContainer).getAttached?.() ?? list
-    return attached as LoroList<unknown>
+    return attached as LoroListInstance<unknown>
   }
 
   private exportNode(nodeId: string): Node {
@@ -247,7 +270,7 @@ export class CollaborationManager {
     }
   }
 
-  private populateNodeContainer(container: LoroMap<Record<string, Value>>, node: Node): void {
+  private populateNodeContainer(container: LoroMapInstance<Record<string, Value>>, node: Node): void {
     const listFields = new Set(['variables', 'prompt_template', 'parameters'])
     container.set('id', node.id)
     container.set('type', node.type)
@@ -325,7 +348,7 @@ export class CollaborationManager {
     return (syncDataAllowList.has(key) || !key.startsWith('_')) && key !== 'selected'
   }
 
-  private syncList(nodeContainer: LoroMap<Record<string, Value>>, key: string, desired: Array<unknown>): void {
+  private syncList(nodeContainer: LoroMapInstance<Record<string, Value>>, key: string, desired: Array<unknown>): void {
     const list = this.ensureList(nodeContainer, key)
     const current = list.toJSON() as Array<unknown>
     const target = Array.isArray(desired) ? desired : []
@@ -471,71 +494,107 @@ export class CollaborationManager {
     if (reactFlowStore)
       this.reactFlowStore = reactFlowStore
 
+    if (this.connectionInitializationPromise) {
+      try {
+        await this.connectionInitializationPromise
+        return connectionId
+      }
+      catch (error) {
+        this.activeConnections.delete(connectionId)
+        throw error
+      }
+    }
+
+    const initializationPromise = this.initializeConnection(appId)
+    this.connectionInitializationPromise = initializationPromise
+
+    try {
+      await initializationPromise
+    }
+    catch (error) {
+      this.activeConnections.delete(connectionId)
+      throw error
+    }
+    finally {
+      if (this.connectionInitializationPromise === initializationPromise)
+        this.connectionInitializationPromise = null
+    }
+
+    return connectionId
+  }
+
+  private async initializeConnection(appId: string): Promise<void> {
     const socket = webSocketClient.connect(appId)
 
     // Setup event listeners BEFORE any other operations
     this.setupSocketEventListeners(socket)
 
-    this.doc = new LoroDoc()
-    this.nodesMap = this.doc.getMap('nodes') as LoroMap<Record<string, Value>>
-    this.edgesMap = this.doc.getMap('edges') as LoroMap<Record<string, Value>>
+    try {
+      await ensureLoroReady()
 
-    // Initialize UndoManager for collaborative undo/redo
-    this.undoManager = new UndoManager(this.doc, {
-      maxUndoSteps: 100,
-      mergeInterval: 500, // Merge operations within 500ms
-      excludeOriginPrefixes: [], // Don't exclude anything - let UndoManager track all local operations
-      onPush: (_isUndo, _range, _event) => {
-        // Store current selection state when an operation is pushed
-        const selectedNode = this.reactFlowStore?.getState().getNodes().find((n: Node) => n.data?.selected)
+      this.doc = new LoroDoc()
+      this.nodesMap = this.doc.getMap('nodes') as LoroMapInstance<Record<string, Value>>
+      this.edgesMap = this.doc.getMap('edges') as LoroMapInstance<Record<string, Value>>
 
-        // Emit event to update UI button states when new operation is pushed
-        setTimeout(() => {
-          this.eventEmitter.emit('undoRedoStateChange', {
-            canUndo: this.undoManager?.canUndo() || false,
-            canRedo: this.undoManager?.canRedo() || false,
-          })
-        }, 0)
+      // Initialize UndoManager for collaborative undo/redo
+      this.undoManager = new UndoManager(this.doc, {
+        maxUndoSteps: 100,
+        mergeInterval: 500, // Merge operations within 500ms
+        excludeOriginPrefixes: [], // Don't exclude anything - let UndoManager track all local operations
+        onPush: (_isUndo, _range, _event) => {
+          // Store current selection state when an operation is pushed
+          const selectedNode = this.reactFlowStore?.getState().getNodes().find((n: Node) => n.data?.selected)
 
-        return {
-          value: {
-            selectedNodeId: selectedNode?.id || null,
-            timestamp: Date.now(),
-          },
-          cursors: [],
-        }
-      },
-      onPop: (_isUndo, value, _counterRange) => {
-        // Restore selection state when undoing/redoing
-        if (value?.value && typeof value.value === 'object' && 'selectedNodeId' in value.value && this.reactFlowStore) {
-          const selectedNodeId = (value.value as { selectedNodeId?: string | null }).selectedNodeId
-          if (selectedNodeId) {
-            const state = this.reactFlowStore.getState()
-            const { setNodes } = state
-            const nodes = state.getNodes()
-            const newNodes = nodes.map((n: Node) => ({
-              ...n,
-              data: {
-                ...n.data,
-                selected: n.id === selectedNodeId,
-              },
-            }))
-            this.captureSetNodesAnomaly(nodes, newNodes, 'reactflow-native:undo-redo-selection-restore')
-            setNodes(newNodes)
+          // Emit event to update UI button states when new operation is pushed
+          setTimeout(() => {
+            this.eventEmitter.emit('undoRedoStateChange', {
+              canUndo: this.undoManager?.canUndo() || false,
+              canRedo: this.undoManager?.canRedo() || false,
+            })
+          }, 0)
+
+          return {
+            value: {
+              selectedNodeId: selectedNode?.id || null,
+              timestamp: Date.now(),
+            },
+            cursors: [],
           }
-        }
-      },
-    })
+        },
+        onPop: (_isUndo, value, _counterRange) => {
+          // Restore selection state when undoing/redoing
+          if (value?.value && typeof value.value === 'object' && 'selectedNodeId' in value.value && this.reactFlowStore) {
+            const selectedNodeId = (value.value as { selectedNodeId?: string | null }).selectedNodeId
+            if (selectedNodeId) {
+              const state = this.reactFlowStore.getState()
+              const { setNodes } = state
+              const nodes = state.getNodes()
+              const newNodes = nodes.map((n: Node) => ({
+                ...n,
+                data: {
+                  ...n.data,
+                  selected: n.id === selectedNodeId,
+                },
+              }))
+              this.captureSetNodesAnomaly(nodes, newNodes, 'reactflow-native:undo-redo-selection-restore')
+              setNodes(newNodes)
+            }
+          }
+        },
+      })
 
-    this.provider = new CRDTProvider(socket, this.doc, this.handleSessionUnauthorized)
+      this.provider = new CRDTProvider(socket, this.doc, this.handleSessionUnauthorized)
 
-    this.setupSubscriptions()
+      this.setupSubscriptions()
 
-    // Force user_connect if already connected
-    if (socket.connected)
-      emitWithAuthGuard(socket, 'user_connect', { workflow_id: appId }, { onUnauthorized: this.handleSessionUnauthorized })
-
-    return connectionId
+      // Force user_connect if already connected
+      if (socket.connected)
+        emitWithAuthGuard(socket, 'user_connect', { workflow_id: appId }, { onUnauthorized: this.handleSessionUnauthorized })
+    }
+    catch (error) {
+      this.forceDisconnect()
+      throw error
+    }
   }
 
   disconnect = (connectionId?: string): void => {
@@ -564,6 +623,7 @@ export class CollaborationManager {
     this.onlineUsers = []
     this.isUndoRedoInProgress = false
     this.rejoinInProgress = false
+    this.connectionInitializationPromise = null
     this.clearGraphImportLog()
 
     // Only reset leader status when actually disconnecting
diff --git a/web/app/components/workflow/collaboration/core/crdt-provider.ts b/web/app/components/workflow/collaboration/core/crdt-provider.ts
index ce3fff4b32..93b8187d4d 100644
--- a/web/app/components/workflow/collaboration/core/crdt-provider.ts
+++ b/web/app/components/workflow/collaboration/core/crdt-provider.ts
@@ -1,13 +1,13 @@
-import type { LoroDoc } from 'loro-crdt'
 import type { Socket } from 'socket.io-client'
+import type { LoroDocInstance } from './loro-web'
 import { emitWithAuthGuard } from './websocket-manager'
 
 export class CRDTProvider {
-  private doc: LoroDoc
+  private doc: LoroDocInstance
   private socket: Socket
   private onUnauthorized?: () => void
 
-  constructor(socket: Socket, doc: LoroDoc, onUnauthorized?: () => void) {
+  constructor(socket: Socket, doc: LoroDocInstance, onUnauthorized?: () => void) {
     this.socket = socket
     this.doc = doc
     this.onUnauthorized = onUnauthorized
diff --git a/web/app/components/workflow/collaboration/core/loro-web.ts b/web/app/components/workflow/collaboration/core/loro-web.ts
new file mode 100644
index 0000000000..45769dc1a4
--- /dev/null
+++ b/web/app/components/workflow/collaboration/core/loro-web.ts
@@ -0,0 +1,43 @@
+import type {
+  Container,
+  LoroDoc as LoroDocShape,
+  LoroList as LoroListShape,
+  LoroMap as LoroMapShape,
+  UndoManager as UndoManagerShape,
+  Value,
+} from 'loro-crdt'
+import {
+  LoroDoc as NodeLoroDoc,
+  LoroList as NodeLoroList,
+  LoroMap as NodeLoroMap,
+  UndoManager as NodeUndoManager,
+} from 'loro-crdt'
+// eslint-disable-next-line antfu/no-import-node-modules-by-path -- loro-crdt does not export a browser-ready wasm entry, so collaboration must target the web bundle file directly.
+import initWebLoro, {
+  LoroDoc as WebLoroDoc,
+  LoroList as WebLoroList,
+  LoroMap as WebLoroMap,
+  UndoManager as WebUndoManager,
+} from '../../../../../node_modules/loro-crdt/web/loro_wasm.js'
+
+const shouldUseWebLoro = typeof window !== 'undefined' && !import.meta.env?.VITEST
+
+export type LoroDocInstance<T extends Record<string, Container> = Record<string, Container>> = LoroDocShape<T>
+export type LoroListInstance<T = unknown> = LoroListShape<T>
+export type LoroMapInstance<T extends Record<string, unknown> = Record<string, unknown>> = LoroMapShape<T>
+export type UndoManagerInstance = UndoManagerShape
+export type { Value }
+
+export const LoroDoc = (shouldUseWebLoro ? WebLoroDoc : NodeLoroDoc) as typeof NodeLoroDoc
+export const LoroList = (shouldUseWebLoro ? WebLoroList : NodeLoroList) as typeof NodeLoroList
+export const LoroMap = (shouldUseWebLoro ? WebLoroMap : NodeLoroMap) as typeof NodeLoroMap
+export const UndoManager = (shouldUseWebLoro ? WebUndoManager : NodeUndoManager) as typeof NodeUndoManager
+
+const initLoro = async (): Promise<void> => {
+  if (!shouldUseWebLoro)
+    return
+
+  await initWebLoro()
+}
+
+export default initLoro
diff --git a/web/app/components/workflow/collaboration/hooks/__tests__/use-collaboration.spec.tsx b/web/app/components/workflow/collaboration/hooks/__tests__/use-collaboration.spec.tsx
new file mode 100644
index 0000000000..6fe572fb5a
--- /dev/null
+++ b/web/app/components/workflow/collaboration/hooks/__tests__/use-collaboration.spec.tsx
@@ -0,0 +1,105 @@
+import { renderHook, waitFor } from '@testing-library/react'
+import { useCollaboration } from '../use-collaboration'
+
+const mocks = vi.hoisted(() => ({
+  connect: vi.fn<(appId: string) => Promise<string>>().mockResolvedValue('connection-1'),
+  disconnect: vi.fn<(connectionId?: string) => void>(),
+  onStateChange: vi.fn(() => vi.fn()),
+  onCursorUpdate: vi.fn(() => vi.fn()),
+  onOnlineUsersUpdate: vi.fn(() => vi.fn()),
+  onNodePanelPresenceUpdate: vi.fn(() => vi.fn()),
+  onLeaderChange: vi.fn(() => vi.fn()),
+  setReactFlowStore: vi.fn<(store: unknown) => void>(),
+  isConnected: vi.fn<() => boolean>(() => false),
+  getLeaderId: vi.fn<() => string | null>(() => null),
+  emitCursorMove: vi.fn<(position: unknown) => void>(),
+}))
+
+vi.mock('@/context/global-public-context', () => ({
+  useGlobalPublicStore: <T,>(selector: (state: { systemFeatures: { enable_collaboration_mode: boolean } }) => T) => selector({
+    systemFeatures: {
+      enable_collaboration_mode: true,
+    },
+  }),
+}))
+
+vi.mock('../../core/collaboration-manager', () => ({
+  collaborationManager: {
+    connect: (appId: string) => mocks.connect(appId),
+    disconnect: (connectionId?: string) => mocks.disconnect(connectionId),
+    onStateChange: () => mocks.onStateChange(),
+    onCursorUpdate: () => mocks.onCursorUpdate(),
+    onOnlineUsersUpdate: () => mocks.onOnlineUsersUpdate(),
+    onNodePanelPresenceUpdate: () => mocks.onNodePanelPresenceUpdate(),
+    onLeaderChange: () => mocks.onLeaderChange(),
+    setReactFlowStore: (store: unknown) => mocks.setReactFlowStore(store),
+    isConnected: () => mocks.isConnected(),
+    getLeaderId: () => mocks.getLeaderId(),
+    emitCursorMove: (position: unknown) => mocks.emitCursorMove(position),
+  },
+}))
+
+describe('useCollaboration', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('should skip collaboration setup when disabled by the caller', async () => {
+    const reactFlowStore = {
+      getState: vi.fn(),
+    }
+
+    const { result } = renderHook(() => useCollaboration('app-1', reactFlowStore as never, false))
+
+    await waitFor(() => {
+      expect(mocks.setReactFlowStore).toHaveBeenCalledWith(null)
+    })
+
+    expect(mocks.connect).not.toHaveBeenCalled()
+    expect(result.current.isEnabled).toBe(false)
+    expect(result.current.onlineUsers).toEqual([])
+    expect(result.current.nodePanelPresence).toEqual({})
+  })
+
+  it('should connect and attach the react flow store when collaboration is enabled', async () => {
+    const reactFlowStore = {
+      getState: vi.fn(),
+    }
+
+    const { result } = renderHook(() => useCollaboration('app-1', reactFlowStore as never, true))
+
+    await waitFor(() => {
+      expect(mocks.connect).toHaveBeenCalledWith('app-1')
+      expect(mocks.setReactFlowStore).toHaveBeenCalledWith(reactFlowStore)
+    })
+
+    expect(result.current.isEnabled).toBe(true)
+  })
+
+  it('should disconnect and clear the react flow store when collaboration gets disabled', async () => {
+    const reactFlowStore = {
+      getState: vi.fn(),
+    }
+
+    const { rerender } = renderHook(
+      ({ enabled }) => useCollaboration('app-1', reactFlowStore as never, enabled),
+      {
+        initialProps: {
+          enabled: true,
+        },
+      },
+    )
+
+    await waitFor(() => {
+      expect(mocks.connect).toHaveBeenCalledWith('app-1')
+      expect(mocks.setReactFlowStore).toHaveBeenCalledWith(reactFlowStore)
+    })
+
+    rerender({ enabled: false })
+
+    await waitFor(() => {
+      expect(mocks.disconnect).toHaveBeenCalledWith('connection-1')
+      expect(mocks.setReactFlowStore).toHaveBeenLastCalledWith(null)
+    })
+  })
+})
diff --git a/web/app/components/workflow/collaboration/hooks/use-collaboration.ts b/web/app/components/workflow/collaboration/hooks/use-collaboration.ts
index 03a9749961..5b621a5250 100644
--- a/web/app/components/workflow/collaboration/hooks/use-collaboration.ts
+++ b/web/app/components/workflow/collaboration/hooks/use-collaboration.ts
@@ -28,15 +28,17 @@ const initialState: CollaborationViewState = {
   isLeader: false,
 }
 
-export function useCollaboration(appId: string, reactFlowStore?: ReactFlowStore) {
+export function useCollaboration(appId: string, reactFlowStore?: ReactFlowStore, enabled = true) {
   const [state, setState] = useState<CollaborationViewState>(initialState)
 
   const cursorServiceRef = useRef<CursorService | null>(null)
   const lastDisconnectReasonRef = useRef<string | null>(null)
-  const isCollaborationEnabled = useGlobalPublicStore(s => s.systemFeatures.enable_collaboration_mode)
+  const isCollaborationFeatureEnabled = useGlobalPublicStore(s => s.systemFeatures.enable_collaboration_mode)
+  const isCollaborationEnabled = isCollaborationFeatureEnabled && enabled
 
   useEffect(() => {
     if (!appId || !isCollaborationEnabled) {
+      lastDisconnectReasonRef.current = null
       Promise.resolve().then(() => {
         setState(initialState)
       })
@@ -109,14 +111,16 @@ export function useCollaboration(appId: string, reactFlowStore?: ReactFlowStore)
   }, [appId, isCollaborationEnabled])
 
   useEffect(() => {
-    if (!reactFlowStore)
+    if (!isCollaborationEnabled || !reactFlowStore) {
+      collaborationManager.setReactFlowStore(null)
       return
+    }
 
     collaborationManager.setReactFlowStore(reactFlowStore)
     return () => {
       collaborationManager.setReactFlowStore(null)
     }
-  }, [reactFlowStore])
+  }, [isCollaborationEnabled, reactFlowStore])
 
   const prevIsConnected = useRef(false)
   useEffect(() => {
diff --git a/web/app/components/workflow/header/online-users.tsx b/web/app/components/workflow/header/online-users.tsx
index 5b80ea0e90..2b35258d5f 100644
--- a/web/app/components/workflow/header/online-users.tsx
+++ b/web/app/components/workflow/header/online-users.tsx
@@ -83,7 +83,8 @@ const OnlineUserAvatar = ({
 const OnlineUsers = () => {
   const { t } = useTranslation()
   const appId = useStore(s => s.appId)
-  const { onlineUsers, cursors, isEnabled: isCollaborationEnabled } = useCollaboration(appId as string)
+  const isWorkflowCollaborationEnabled = useStore(s => !s.isRestoring && !s.historyWorkflowData)
+  const { onlineUsers, cursors, isEnabled: isCollaborationEnabled } = useCollaboration(appId as string, undefined, isWorkflowCollaborationEnabled)
   const { userProfile } = useAppContext()
   const reactFlow = useReactFlow()
   const [dropdownOpen, setDropdownOpen] = useState(false)
diff --git a/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx b/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx
index 80ba0e5a3f..f40d27d113 100644
--- a/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx
+++ b/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx
@@ -102,8 +102,9 @@ const BasePanel: FC<BasePanelProps> = ({
   const { t } = useTranslation()
   const language = useLanguage()
   const appId = useStore(s => s.appId)
+  const isWorkflowCollaborationEnabled = useStore(s => !s.isRestoring && !s.historyWorkflowData)
   const { userProfile } = useAppContext()
-  const { isConnected, nodePanelPresence } = useCollaboration(appId as string)
+  const { isConnected, nodePanelPresence } = useCollaboration(appId as string, undefined, isWorkflowCollaborationEnabled)
   const { showMessageLogModal } = useAppStore(useShallow(state => ({
     showMessageLogModal: state.showMessageLogModal,
   })))
diff --git a/web/app/components/workflow/nodes/_base/node.tsx b/web/app/components/workflow/nodes/_base/node.tsx
index 07bd28f45c..4c2d0f7a90 100644
--- a/web/app/components/workflow/nodes/_base/node.tsx
+++ b/web/app/components/workflow/nodes/_base/node.tsx
@@ -88,7 +88,8 @@ const BaseNode: FC<BaseNodeProps> = ({
   const resolvedWorkflowStore = workflowStore ?? fallbackWorkflowStoreRef.current
   const appId = useZustandStore(resolvedWorkflowStore, s => s.appId)
   const controlMode = useZustandStore(resolvedWorkflowStore, s => s.controlMode)
-  const { nodePanelPresence } = useCollaboration(appId as string)
+  const isWorkflowCollaborationEnabled = useZustandStore(resolvedWorkflowStore, s => !s.isRestoring && !s.historyWorkflowData)
+  const { nodePanelPresence } = useCollaboration(appId as string, undefined, isWorkflowCollaborationEnabled)
   const { shouldDim: pluginDimmed, isChecking: pluginIsChecking, isMissing: pluginIsMissing, canInstall: pluginCanInstall, uniqueIdentifier: pluginUniqueIdentifier } = useNodePluginInstallation(data)
   const pluginInstallLocked = !pluginIsChecking && pluginIsMissing && pluginCanInstall && Boolean(pluginUniqueIdentifier)
 
diff --git a/web/app/components/workflow/nodes/agent/__tests__/use-config.spec.tsx b/web/app/components/workflow/nodes/agent/__tests__/use-config.spec.tsx
new file mode 100644
index 0000000000..b4ba9a593f
--- /dev/null
+++ b/web/app/components/workflow/nodes/agent/__tests__/use-config.spec.tsx
@@ -0,0 +1,138 @@
+import type { AgentNodeType } from '../types'
+import { renderHook } from '@testing-library/react'
+import { FormTypeEnum } from '@/app/components/header/account-setting/model-provider-page/declarations'
+import { BlockEnum } from '@/app/components/workflow/types'
+import { VarType as ToolVarType } from '../../tool/types'
+import useConfig from '../use-config'
+
+const mockSetInputs = vi.fn()
+const mockUseNodesReadOnly = vi.fn()
+const mockUseNodeCrud = vi.fn()
+const mockUseVarList = vi.fn()
+const mockUseStrategyProviderDetail = vi.fn()
+const mockUseFetchPluginsInMarketPlaceByIds = vi.fn()
+const mockUseCheckInstalled = vi.fn()
+const mockUseAvailableVarList = vi.fn()
+const mockUseIsChatMode = vi.fn()
+
+vi.mock('@/app/components/workflow/hooks', () => ({
+  useIsChatMode: () => mockUseIsChatMode(),
+  useNodesReadOnly: () => mockUseNodesReadOnly(),
+}))
+
+vi.mock('@/app/components/workflow/nodes/_base/hooks/use-node-crud', () => ({
+  default: (...args: unknown[]) => mockUseNodeCrud(...args),
+}))
+
+vi.mock('@/app/components/workflow/nodes/_base/hooks/use-var-list', () => ({
+  default: (...args: unknown[]) => mockUseVarList(...args),
+}))
+
+vi.mock('@/app/components/workflow/nodes/_base/hooks/use-available-var-list', () => ({
+  default: (...args: unknown[]) => mockUseAvailableVarList(...args),
+}))
+
+vi.mock('@/service/use-strategy', () => ({
+  useStrategyProviderDetail: (...args: unknown[]) => mockUseStrategyProviderDetail(...args),
+}))
+
+vi.mock('@/service/use-plugins', () => ({
+  useFetchPluginsInMarketPlaceByIds: (...args: unknown[]) => mockUseFetchPluginsInMarketPlaceByIds(...args),
+  useCheckInstalled: (...args: unknown[]) => mockUseCheckInstalled(...args),
+}))
+
+const createPayload = (overrides: Partial<AgentNodeType> = {}): AgentNodeType => ({
+  title: 'Agent',
+  desc: '',
+  type: BlockEnum.Agent,
+  output_schema: {},
+  agent_strategy_provider_name: 'provider/agent',
+  agent_strategy_name: 'react',
+  agent_strategy_label: 'React Agent',
+  agent_parameters: {
+    toolParam: {
+      type: ToolVarType.constant,
+      value: {
+        settings: {},
+        parameters: {},
+        schemas: [],
+      },
+    },
+  },
+  ...overrides,
+})
+
+const createStrategyProviderDetail = () => ({
+  declaration: {
+    strategies: [{
+      identity: {
+        name: 'react',
+      },
+      parameters: [{
+        name: 'toolParam',
+        type: FormTypeEnum.toolSelector,
+      }],
+    }],
+  },
+})
+
+describe('agent useConfig', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+
+    mockUseNodesReadOnly.mockReturnValue({
+      nodesReadOnly: false,
+    })
+    mockUseNodeCrud.mockImplementation((_id: string, payload: AgentNodeType) => ({
+      inputs: payload,
+      setInputs: mockSetInputs,
+    }))
+    mockUseVarList.mockReturnValue({
+      handleVarListChange: vi.fn(),
+      handleAddVariable: vi.fn(),
+    })
+    mockUseStrategyProviderDetail.mockReturnValue({
+      data: createStrategyProviderDetail(),
+      isLoading: false,
+      isError: false,
+      refetch: vi.fn(),
+    })
+    mockUseFetchPluginsInMarketPlaceByIds.mockReturnValue({
+      data: {
+        data: {
+          plugins: [],
+        },
+      },
+      isLoading: false,
+      refetch: vi.fn(),
+    })
+    mockUseCheckInstalled.mockReturnValue({
+      data: {
+        plugins: [],
+      },
+    })
+    mockUseAvailableVarList.mockReturnValue({
+      availableVars: [],
+      availableNodesWithParent: [],
+    })
+    mockUseIsChatMode.mockReturnValue(true)
+  })
+
+  it('should skip legacy migration when the node is read-only', () => {
+    mockUseNodesReadOnly.mockReturnValue({
+      nodesReadOnly: true,
+    })
+
+    renderHook(() => useConfig('agent-node', createPayload()))
+
+    expect(mockSetInputs).not.toHaveBeenCalled()
+  })
+
+  it('should migrate legacy agent tool data when the node is editable', () => {
+    renderHook(() => useConfig('agent-node', createPayload()))
+
+    expect(mockSetInputs).toHaveBeenCalledWith(expect.objectContaining({
+      tool_node_version: '2',
+    }))
+  })
+})
diff --git a/web/app/components/workflow/nodes/agent/use-config.ts b/web/app/components/workflow/nodes/agent/use-config.ts
index 49311f4d6d..5f61a0972c 100644
--- a/web/app/components/workflow/nodes/agent/use-config.ts
+++ b/web/app/components/workflow/nodes/agent/use-config.ts
@@ -129,9 +129,7 @@ const useConfig = (id: string, payload: AgentNodeType) => {
     return res
   }
 
-  const formattingLegacyData = () => {
-    if (inputs.version || inputs.tool_node_version)
-      return inputs
+  const formattingLegacyData = useCallback(() => {
     const newData = produce(inputs, (draft) => {
       const schemas = currentStrategy?.parameters || []
       Object.keys(draft.agent_parameters || {}).forEach((key) => {
@@ -144,15 +142,17 @@ const useConfig = (id: string, payload: AgentNodeType) => {
       draft.tool_node_version = '2'
     })
     return newData
-  }
+  }, [currentStrategy?.parameters, inputs])
+
+  const shouldFormatLegacyData = Boolean(currentStrategy) && !readOnly && !inputs.version && !inputs.tool_node_version
 
   // formatting legacy data
   useEffect(() => {
-    if (!currentStrategy)
+    if (!shouldFormatLegacyData)
       return
     const newData = formattingLegacyData()
     setInputs(newData)
-  }, [currentStrategy])
+  }, [formattingLegacyData, setInputs, shouldFormatLegacyData])
 
   // vars