Stuff

apps/sim/app/_styles/globals.css

@@ -76,6 +76,14 @@
   pointer-events: none;
 }
 
+/**
+ * Suppress the default selection ring for grouped selections
+ * These blocks show a more transparent ring via the component's ring overlay
+ */
+.react-flow__node.selected > div[data-grouped-selection="true"] > div::after {
+  box-shadow: none;
+}
+
 /**
  * Color tokens - single source of truth for all colors
  * Light mode: Warm theme

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/context-menu/block-context-menu.tsx

@@ -29,6 +29,8 @@ export function BlockContextMenu({
   onRemoveFromSubflow,
   onOpenEditor,
   onRename,
+  onGroupBlocks,
+  onUngroupBlocks,
   hasClipboard = false,
   showRemoveFromSubflow = false,
   disableEdit = false,
@@ -47,6 +49,14 @@ export function BlockContextMenu({
 
   const canRemoveFromSubflow = showRemoveFromSubflow && !hasStarterBlock
 
+  // Check if we can group: need at least 2 blocks selected
+  const canGroup = selectedBlocks.length >= 2
+
+  // Check if we can ungroup: at least one selected block must be in a group
+  // Ungrouping will ungroup all blocks in that group (the entire group, not just selected blocks)
+  const hasGroupedBlock = selectedBlocks.some((b) => !!b.groupId)
+  const canUngroup = hasGroupedBlock
+
   const getToggleEnabledLabel = () => {
     if (allEnabled) return 'Disable'
     if (allDisabled) return 'Enable'
@@ -141,6 +151,31 @@ export function BlockContextMenu({
           </PopoverItem>
         )}
 
+        {/* Block group actions */}
+        {(canGroup || canUngroup) && <PopoverDivider />}
+        {canGroup && (
+          <PopoverItem
+            disabled={disableEdit}
+            onClick={() => {
+              onGroupBlocks()
+              onClose()
+            }}
+          >
+            Group Blocks
+          </PopoverItem>
+        )}
+        {canUngroup && (
+          <PopoverItem
+            disabled={disableEdit}
+            onClick={() => {
+              onUngroupBlocks()
+              onClose()
+            }}
+          >
+            Ungroup
+          </PopoverItem>
+        )}
+
         {/* Single block actions */}
         {isSingleBlock && <PopoverDivider />}
         {isSingleBlock && !isSubflow && (

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/context-menu/types.ts

@@ -24,6 +24,8 @@ export interface ContextMenuBlockInfo {
   parentId?: string
   /** Parent type ('loop' | 'parallel') if nested */
   parentType?: string
+  /** Group ID if block is in a group */
+  groupId?: string
 }
 
 /**
@@ -50,6 +52,8 @@ export interface BlockContextMenuProps {
   onRemoveFromSubflow: () => void
   onOpenEditor: () => void
   onRename: () => void
+  onGroupBlocks: () => void
+  onUngroupBlocks: () => void
   /** Whether clipboard has content for pasting */
   hasClipboard?: boolean
   /** Whether remove from subflow option should be shown */

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/note-block/note-block.tsx

@@ -1,6 +1,6 @@
 import { memo, useCallback, useMemo } from 'react'
 import ReactMarkdown from 'react-markdown'
-import type { NodeProps } from 'reactflow'
+import { type NodeProps, useReactFlow } from 'reactflow'
 import remarkGfm from 'remark-gfm'
 import { cn } from '@/lib/core/utils/cn'
 import { useUserPermissionsContext } from '@/app/workspace/[workspaceId]/providers/workspace-permissions-provider'
@@ -10,6 +10,7 @@ import {
   useBlockDimensions,
 } from '@/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-block-dimensions'
 import { useSubBlockStore } from '@/stores/workflows/subblock/store'
+import { useWorkflowStore } from '@/stores/workflows/workflow/store'
 import { ActionBar } from '../workflow-block/components'
 import type { WorkflowBlockProps } from '../workflow-block/types'
 
@@ -198,6 +199,57 @@ export const NoteBlock = memo(function NoteBlock({ id, data }: NodeProps<NoteBlo
 
   const userPermissions = useUserPermissionsContext()
 
+  // Get React Flow methods for group selection expansion
+  const { getNodes, setNodes } = useReactFlow()
+  const { getGroups } = useWorkflowStore()
+
+  /**
+   * Expands selection to include all group members on mouse down.
+   * This ensures that when a user starts dragging a note in a group,
+   * all other blocks in the group are also selected and will move together.
+   */
+  const handleGroupMouseDown = useCallback(
+    (e: React.MouseEvent) => {
+      // Only process left mouse button clicks
+      if (e.button !== 0) return
+
+      const groupId = data.groupId
+      if (!groupId) return
+
+      const groups = getGroups()
+      const group = groups[groupId]
+      if (!group || group.blockIds.length <= 1) return
+
+      const groupBlockIds = new Set(group.blockIds)
+      const allNodes = getNodes()
+
+      // Check if all group members are already selected
+      const allSelected = [...groupBlockIds].every((blockId) =>
+        allNodes.find((n) => n.id === blockId && n.selected)
+      )
+
+      if (allSelected) return
+
+      // Expand selection to include all group members
+      setNodes((nodes) =>
+        nodes.map((n) => {
+          const isInGroup = groupBlockIds.has(n.id)
+          const isThisBlock = n.id === id
+          return {
+            ...n,
+            selected: isInGroup ? true : n.selected,
+            data: {
+              ...n.data,
+              // Mark as grouped selection if in group but not the directly clicked block
+              isGroupedSelection: isInGroup && !isThisBlock && !n.selected,
+            },
+          }
+        })
+      )
+    },
+    [id, data.groupId, getNodes, setNodes, getGroups]
+  )
+
   /**
    * Calculate deterministic dimensions based on content structure.
    * Uses fixed width and computed height to avoid ResizeObserver jitter.
@@ -216,8 +268,14 @@ export const NoteBlock = memo(function NoteBlock({ id, data }: NodeProps<NoteBlo
     dependencies: [isEmpty],
   })
 
+  const isGroupedSelection = data.isGroupedSelection ?? false
+
   return (
-    <div className='group relative'>
+    <div
+      className='group relative'
+      data-grouped-selection={isGroupedSelection ? 'true' : undefined}
+      onMouseDown={handleGroupMouseDown}
+    >
       <div
         className={cn(
           'relative z-[20] w-[250px] cursor-default select-none rounded-[8px] border border-[var(--border)] bg-[var(--surface-2)]'

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/subflows/subflow-node.tsx

@@ -1,4 +1,4 @@
-import { memo, useMemo, useRef } from 'react'
+import { memo, useCallback, useMemo, useRef } from 'react'
 import { RepeatIcon, SplitIcon } from 'lucide-react'
 import { Handle, type NodeProps, Position, useReactFlow } from 'reactflow'
 import { Button, Trash } from '@/components/emcn'
@@ -8,6 +8,7 @@ import { type DiffStatus, hasDiffStatus } from '@/lib/workflows/diff/types'
 import { useCurrentWorkflow } from '@/app/workspace/[workspaceId]/w/[workflowId]/hooks'
 import { useCollaborativeWorkflow } from '@/hooks/use-collaborative-workflow'
 import { usePanelEditorStore } from '@/stores/panel'
+import { useWorkflowStore } from '@/stores/workflows/workflow/store'
 
 /**
  * Global styles for subflow nodes (loop and parallel containers).
@@ -51,6 +52,8 @@ export interface SubflowNodeData {
   isPreviewSelected?: boolean
   kind: 'loop' | 'parallel'
   name?: string
+  /** The ID of the group this subflow belongs to */
+  groupId?: string
 }
 
 /**
@@ -62,8 +65,9 @@ export interface SubflowNodeData {
  * @returns Rendered subflow node component
  */
 export const SubflowNodeComponent = memo(({ data, id }: NodeProps<SubflowNodeData>) => {
-  const { getNodes } = useReactFlow()
+  const { getNodes, setNodes } = useReactFlow()
   const { collaborativeBatchRemoveBlocks } = useCollaborativeWorkflow()
+  const { getGroups } = useWorkflowStore()
   const blockRef = useRef<HTMLDivElement>(null)
 
   const currentWorkflow = useCurrentWorkflow()
@@ -140,10 +144,57 @@ export const SubflowNodeComponent = memo(({ data, id }: NodeProps<SubflowNodeDat
     diffStatus === 'edited' && 'ring-[var(--warning)]'
   )
 
+  /**
+   * Expands selection to include all group members on mouse down.
+   * This ensures that when a user starts dragging a subflow in a group,
+   * all other blocks in the group are also selected and will move together.
+   */
+  const handleGroupMouseDown = useCallback(
+    (e: React.MouseEvent) => {
+      // Only process left mouse button clicks
+      if (e.button !== 0) return
+
+      const groupId = data.groupId
+      if (!groupId) return
+
+      const groups = getGroups()
+      const group = groups[groupId]
+      if (!group || group.blockIds.length <= 1) return
+
+      const groupBlockIds = new Set(group.blockIds)
+      const allNodes = getNodes()
+
+      // Check if all group members are already selected
+      const allSelected = [...groupBlockIds].every((blockId) =>
+        allNodes.find((n) => n.id === blockId && n.selected)
+      )
+
+      if (allSelected) return
+
+      // Expand selection to include all group members
+      setNodes((nodes) =>
+        nodes.map((n) => {
+          const isInGroup = groupBlockIds.has(n.id)
+          const isThisBlock = n.id === id
+          return {
+            ...n,
+            selected: isInGroup ? true : n.selected,
+            data: {
+              ...n.data,
+              // Mark as grouped selection if in group but not the directly clicked block
+              isGroupedSelection: isInGroup && !isThisBlock && !n.selected,
+            },
+          }
+        })
+      )
+    },
+    [id, data.groupId, getNodes, setNodes, getGroups]
+  )
+
   return (
     <>
       <SubflowNodeStyles />
-      <div className='group relative'>
+      <div className='group relative' onMouseDown={handleGroupMouseDown}>
         <div
           ref={blockRef}
           onClick={() => setCurrentBlockId(id)}

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/components/action-bar/action-bar.tsx

@@ -107,7 +107,7 @@ export const ActionBar = memo(
     return (
       <div
         className={cn(
-          '-top-[46px] absolute right-0',
+          '-top-[46px] absolute right-0 z-[100]',
           'flex flex-row items-center',
           'opacity-0 transition-opacity duration-200 group-hover:opacity-100',
           'gap-[5px] rounded-[10px] bg-[var(--surface-4)] p-[5px]'

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/types.ts

@@ -12,6 +12,10 @@ export interface WorkflowBlockProps {
   isPreview?: boolean
   /** Whether this block is selected in preview mode */
   isPreviewSelected?: boolean
+  /** Whether this block is selected as part of a group (not directly clicked) */
+  isGroupedSelection?: boolean
+  /** The ID of the group this block belongs to */
+  groupId?: string
   subBlockValues?: Record<string, any>
   blockState?: any
 }

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/workflow-block.tsx

@@ -1,7 +1,7 @@
 import { memo, useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { createLogger } from '@sim/logger'
 import { useParams } from 'next/navigation'
-import { Handle, type NodeProps, Position, useUpdateNodeInternals } from 'reactflow'
+import { Handle, type NodeProps, Position, useReactFlow, useUpdateNodeInternals } from 'reactflow'
 import { Badge, Tooltip } from '@/components/emcn'
 import { getEnv, isTruthy } from '@/lib/core/config/env'
 import { cn } from '@/lib/core/utils/cn'
@@ -915,8 +915,65 @@ export const WorkflowBlock = memo(function WorkflowBlock({
   const userPermissions = useUserPermissionsContext()
   const isWorkflowSelector = type === 'workflow' || type === 'workflow_input'
 
+  const isGroupedSelection = data.isGroupedSelection ?? false
+
+  // Get React Flow methods for group selection expansion
+  const { getNodes, setNodes } = useReactFlow()
+  const { getGroups } = useWorkflowStore()
+
+  /**
+   * Expands selection to include all group members on mouse down.
+   * This ensures that when a user starts dragging a block in a group,
+   * all other blocks in the group are also selected and will move together.
+   */
+  const handleGroupMouseDown = useCallback(
+    (e: React.MouseEvent) => {
+      // Only process left mouse button clicks
+      if (e.button !== 0) return
+
+      const groupId = data.groupId
+      if (!groupId) return
+
+      const groups = getGroups()
+      const group = groups[groupId]
+      if (!group || group.blockIds.length <= 1) return
+
+      const groupBlockIds = new Set(group.blockIds)
+      const allNodes = getNodes()
+
+      // Check if all group members are already selected
+      const allSelected = [...groupBlockIds].every((blockId) =>
+        allNodes.find((n) => n.id === blockId && n.selected)
+      )
+
+      if (allSelected) return
+
+      // Expand selection to include all group members
+      setNodes((nodes) =>
+        nodes.map((n) => {
+          const isInGroup = groupBlockIds.has(n.id)
+          const isThisBlock = n.id === id
+          return {
+            ...n,
+            selected: isInGroup ? true : n.selected,
+            data: {
+              ...n.data,
+              // Mark as grouped selection if in group but not the directly clicked block
+              isGroupedSelection: isInGroup && !isThisBlock && !n.selected,
+            },
+          }
+        })
+      )
+    },
+    [id, data.groupId, getNodes, setNodes, getGroups]
+  )
+
   return (
-    <div className='group relative'>
+    <div
+      className='group relative'
+      data-grouped-selection={isGroupedSelection ? 'true' : undefined}
+      onMouseDown={handleGroupMouseDown}
+    >
       <div
         ref={contentRef}
         onClick={handleClick}

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-block-visual.ts

@@ -30,6 +30,7 @@ interface UseBlockVisualProps {
 export function useBlockVisual({ blockId, data, isPending = false }: UseBlockVisualProps) {
   const isPreview = data.isPreview ?? false
   const isPreviewSelected = data.isPreviewSelected ?? false
+  const isGroupedSelection = data.isGroupedSelection ?? false
 
   const currentWorkflow = useCurrentWorkflow()
   const activeWorkflowId = useWorkflowRegistry((state) => state.activeWorkflowId)
@@ -64,8 +65,18 @@ export function useBlockVisual({ blockId, data, isPending = false }: UseBlockVis
         diffStatus: isPreview ? undefined : diffStatus,
         runPathStatus,
         isPreviewSelection: isPreview && isPreviewSelected,
+        isGroupedSelection: !isPreview && isGroupedSelection,
       }),
-    [isActive, isPending, isDeletedBlock, diffStatus, runPathStatus, isPreview, isPreviewSelected]
+    [
+      isActive,
+      isPending,
+      isDeletedBlock,
+      diffStatus,
+      runPathStatus,
+      isPreview,
+      isPreviewSelected,
+      isGroupedSelection,
+    ]
   )
 
   return {

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-canvas-context-menu.ts

@@ -35,6 +35,7 @@ export function useCanvasContextMenu({ blocks, getNodes }: UseCanvasContextMenuP
         const block = blocks[n.id]
         const parentId = block?.data?.parentId
         const parentType = parentId ? blocks[parentId]?.type : undefined
+        const groupId = block?.data?.groupId
         return {
           id: n.id,
           type: block?.type || '',
@@ -42,6 +43,7 @@ export function useCanvasContextMenu({ blocks, getNodes }: UseCanvasContextMenuP
           horizontalHandles: block?.horizontalHandles ?? false,
           parentId,
           parentType,
+          groupId,
         }
       }),
     [blocks]
@@ -49,14 +51,22 @@ export function useCanvasContextMenu({ blocks, getNodes }: UseCanvasContextMenuP
 
   /**
    * Handle right-click on a node (block)
+   * If the node is part of a multiselection, include all selected nodes.
+   * If the node is not selected, just use that node.
    */
   const handleNodeContextMenu = useCallback(
     (event: React.MouseEvent, node: Node) => {
       event.preventDefault()
       event.stopPropagation()
 
-      const selectedNodes = getNodes().filter((n) => n.selected)
-      const nodesToUse = selectedNodes.some((n) => n.id === node.id) ? selectedNodes : [node]
+      // Get all currently selected nodes
+      const allNodes = getNodes()
+      const selectedNodes = allNodes.filter((n) => n.selected)
+
+      // If the right-clicked node is already selected, use all selected nodes
+      // Otherwise, just use the right-clicked node
+      const isNodeSelected = selectedNodes.some((n) => n.id === node.id)
+      const nodesToUse = isNodeSelected && selectedNodes.length > 0 ? selectedNodes : [node]
 
       setPosition({ x: event.clientX, y: event.clientY })
       setSelectedBlocks(nodesToBlockInfos(nodesToUse))

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/utils/block-ring-utils.ts

@@ -11,6 +11,7 @@ export interface BlockRingOptions {
   diffStatus: BlockDiffStatus
   runPathStatus: BlockRunPathStatus
   isPreviewSelection?: boolean
+  isGroupedSelection?: boolean
 }
 
 /**
@@ -21,8 +22,15 @@ export function getBlockRingStyles(options: BlockRingOptions): {
   hasRing: boolean
   ringClassName: string
 } {
-  const { isActive, isPending, isDeletedBlock, diffStatus, runPathStatus, isPreviewSelection } =
-    options
+  const {
+    isActive,
+    isPending,
+    isDeletedBlock,
+    diffStatus,
+    runPathStatus,
+    isPreviewSelection,
+    isGroupedSelection,
+  } = options
 
   const hasRing =
     isActive ||
@@ -30,17 +38,24 @@ export function getBlockRingStyles(options: BlockRingOptions): {
     diffStatus === 'new' ||
     diffStatus === 'edited' ||
     isDeletedBlock ||
-    !!runPathStatus
+    !!runPathStatus ||
+    !!isGroupedSelection
 
   const ringClassName = cn(
+    // Grouped selection: more transparent ring for blocks selected as part of a group
+    // Using rgba with the brand-secondary color (#33b4ff) at 40% opacity
+    isGroupedSelection &&
+      !isActive &&
+      'ring-[2px] ring-[rgba(51,180,255,0.4)]',
     // Preview selection: static blue ring (standard thickness, no animation)
     isActive && isPreviewSelection && 'ring-[1.75px] ring-[var(--brand-secondary)]',
     // Executing block: pulsing success ring with prominent thickness
     isActive &&
       !isPreviewSelection &&
+      !isGroupedSelection &&
       'ring-[3.5px] ring-[var(--border-success)] animate-ring-pulse',
-    // Non-active states use standard ring utilities
-    !isActive && hasRing && 'ring-[1.75px]',
+    // Non-active states use standard ring utilities (except grouped selection which has its own)
+    !isActive && hasRing && !isGroupedSelection && 'ring-[1.75px]',
     // Pending state: warning ring
     !isActive && isPending && 'ring-[var(--warning)]',
     // Deleted state (highest priority after active/pending)

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/workflow.tsx

@@ -264,12 +264,14 @@ const WorkflowContent = React.memo(() => {
   const canUndo = undoRedoStack.undo.length > 0
   const canRedo = undoRedoStack.redo.length > 0
 
-  const { updateNodeDimensions, setDragStartPosition, getDragStartPosition } = useWorkflowStore(
-    useShallow((state) => ({
-      updateNodeDimensions: state.updateNodeDimensions,
-      setDragStartPosition: state.setDragStartPosition,
-      getDragStartPosition: state.getDragStartPosition,
-    }))
+  const { updateNodeDimensions, setDragStartPosition, getDragStartPosition, getGroups } =
+    useWorkflowStore(
+      useShallow((state) => ({
+        updateNodeDimensions: state.updateNodeDimensions,
+        setDragStartPosition: state.setDragStartPosition,
+        getDragStartPosition: state.getDragStartPosition,
+        getGroups: state.getGroups,
+      }))
   )
 
   const copilotCleanup = useCopilotStore((state) => state.cleanup)
@@ -361,6 +363,14 @@ const WorkflowContent = React.memo(() => {
     new Map()
   )
 
+  /**
+   * Stores original positions and parentIds for nodes temporarily parented during group drag.
+   * Key: node ID, Value: { originalPosition, originalParentId }
+   */
+  const groupDragTempParentsRef = useRef<
+    Map<string, { originalPosition: { x: number; y: number }; originalParentId?: string }>
+  >(new Map())
+
   /** Stores node IDs to select on next derivedNodes sync (for paste/duplicate operations). */
   const pendingSelectionRef = useRef<Set<string> | null>(null)
 
@@ -458,6 +468,8 @@ const WorkflowContent = React.memo(() => {
     collaborativeBatchRemoveBlocks,
     collaborativeBatchToggleBlockEnabled,
     collaborativeBatchToggleBlockHandles,
+    collaborativeGroupBlocks,
+    collaborativeUngroupBlocks,
     undo,
     redo,
   } = useCollaborativeWorkflow()
@@ -782,6 +794,35 @@ const WorkflowContent = React.memo(() => {
     collaborativeBatchToggleBlockHandles(blockIds)
   }, [contextMenuBlocks, collaborativeBatchToggleBlockHandles])
 
+  const handleContextGroupBlocks = useCallback(() => {
+    const blockIds = contextMenuBlocks.map((block) => block.id)
+    if (blockIds.length >= 2) {
+      // Validate that all blocks share the same parent (or all have no parent)
+      // Blocks inside a subflow cannot be grouped with blocks outside that subflow
+      const parentIds = contextMenuBlocks.map((block) => block.parentId || null)
+      const uniqueParentIds = new Set(parentIds)
+      if (uniqueParentIds.size > 1) {
+        addNotification({
+          level: 'error',
+          message: 'Cannot group blocks from different subflows',
+        })
+        return
+      }
+      collaborativeGroupBlocks(blockIds)
+    }
+  }, [contextMenuBlocks, collaborativeGroupBlocks, addNotification])
+
+  const handleContextUngroupBlocks = useCallback(() => {
+    // Find the first block with a groupId
+    const groupedBlock = contextMenuBlocks.find((block) => block.groupId)
+    if (!groupedBlock?.groupId) return
+
+    // The block's groupId is the group we want to ungroup
+    // This is the direct group the block belongs to, which is the "top level" from the user's perspective
+    // (the most recently created group that contains this block)
+    collaborativeUngroupBlocks(groupedBlock.groupId)
+  }, [contextMenuBlocks, collaborativeUngroupBlocks])
+
   const handleContextRemoveFromSubflow = useCallback(() => {
     const blocksToRemove = contextMenuBlocks.filter(
       (block) => block.parentId && (block.parentType === 'loop' || block.parentType === 'parallel')
@@ -1906,6 +1947,7 @@ const WorkflowContent = React.memo(() => {
           name: block.name,
           isActive,
           isPending,
+          groupId: block.data?.groupId,
         },
         // Include dynamic dimensions for container resizing calculations (must match rendered size)
         // Both note and workflow blocks calculate dimensions deterministically via useBlockDimensions
@@ -2060,16 +2102,56 @@ const WorkflowContent = React.memo(() => {
       window.removeEventListener('remove-from-subflow', handleRemoveFromSubflow as EventListener)
   }, [blocks, edgesForDisplay, getNodeAbsolutePosition, collaborativeBatchUpdateParent])
 
-  /** Handles node changes - applies changes and resolves parent-child selection conflicts. */
+  /** Handles node changes - applies changes and resolves parent-child selection conflicts.
+   *  Also expands selection to include all group members when a grouped block is selected.
+   */
   const onNodesChange = useCallback(
     (changes: NodeChange[]) => {
       setDisplayNodes((nds) => {
-        const updated = applyNodeChanges(changes, nds)
+        let updated = applyNodeChanges(changes, nds)
         const hasSelectionChange = changes.some((c) => c.type === 'select')
-        return hasSelectionChange ? resolveParentChildSelectionConflicts(updated, blocks) : updated
+
+        if (hasSelectionChange) {
+          // Expand selection to include all group members
+          const groups = getGroups()
+          const selectedNodeIds = new Set(updated.filter((n) => n.selected).map((n) => n.id))
+          const groupsToInclude = new Set<string>()
+
+          // Find all groups that have at least one selected member
+          selectedNodeIds.forEach((nodeId) => {
+            const groupId = blocks[nodeId]?.data?.groupId
+            if (groupId && groups[groupId]) {
+              groupsToInclude.add(groupId)
+            }
+          })
+
+          // Add all blocks from those groups to the selection
+          if (groupsToInclude.size > 0) {
+            const expandedNodeIds = new Set(selectedNodeIds)
+            groupsToInclude.forEach((groupId) => {
+              const group = groups[groupId]
+              if (group) {
+                group.blockIds.forEach((blockId) => expandedNodeIds.add(blockId))
+              }
+            })
+
+            // Update nodes to include expanded selection
+            if (expandedNodeIds.size > selectedNodeIds.size) {
+              updated = updated.map((n) => ({
+                ...n,
+                selected: expandedNodeIds.has(n.id) ? true : n.selected,
+              }))
+            }
+          }
+
+          // Resolve parent-child conflicts
+          updated = resolveParentChildSelectionConflicts(updated, blocks)
+        }
+
+        return updated
       })
     },
-    [blocks]
+    [blocks, getGroups]
   )
 
   /**
@@ -2530,9 +2612,55 @@ const WorkflowContent = React.memo(() => {
         parentId: currentParentId,
       })
 
-      // Capture all selected nodes' positions for multi-node undo/redo
+      // Expand selection to include all group members before capturing positions
+      const groups = getGroups()
       const allNodes = getNodes()
-      const selectedNodes = allNodes.filter((n) => n.selected)
+
+      // Find the group of the dragged node
+      const draggedBlockGroupId = blocks[node.id]?.data?.groupId
+
+      // If the dragged node is in a group, expand selection to include all group members
+      if (draggedBlockGroupId && groups[draggedBlockGroupId]) {
+        const group = groups[draggedBlockGroupId]
+        const groupBlockIds = new Set(group.blockIds)
+
+        // Check if we need to expand selection
+        const currentSelectedIds = new Set(allNodes.filter((n) => n.selected).map((n) => n.id))
+        const needsExpansion = [...groupBlockIds].some((id) => !currentSelectedIds.has(id))
+
+        if (needsExpansion) {
+          setNodes((nodes) =>
+            nodes.map((n) => {
+              const isInGroup = groupBlockIds.has(n.id)
+              const isDirectlyDragged = n.id === node.id
+              return {
+                ...n,
+                selected: isInGroup ? true : n.selected,
+                data: {
+                  ...n.data,
+                  // Mark as grouped selection if in group but not the directly dragged node
+                  isGroupedSelection: isInGroup && !isDirectlyDragged && !n.selected,
+                },
+              }
+            })
+          )
+        }
+      }
+
+      // Capture all selected nodes' positions for multi-node undo/redo
+      // Re-get nodes after potential selection expansion
+      const updatedNodes = getNodes()
+      const selectedNodes = updatedNodes.filter((n) => {
+        // Always include the dragged node
+        if (n.id === node.id) return true
+        // Include node if it's selected OR if it's in the same group as the dragged node
+        if (n.selected) return true
+        if (draggedBlockGroupId && groups[draggedBlockGroupId]) {
+          return groups[draggedBlockGroupId].blockIds.includes(n.id)
+        }
+        return false
+      })
+
       multiNodeDragStartRef.current.clear()
       selectedNodes.forEach((n) => {
         const block = blocks[n.id]
@@ -2544,8 +2672,63 @@ const WorkflowContent = React.memo(() => {
           })
         }
       })
+
+      // Set up temporary parent-child relationships for group members
+      // This leverages React Flow's built-in parent-child drag behavior
+      // BUT: Only do this if NOT all group members are already selected
+      // If all are selected, React Flow's native multiselect drag will handle it
+      groupDragTempParentsRef.current.clear()
+      if (draggedBlockGroupId && groups[draggedBlockGroupId]) {
+        const group = groups[draggedBlockGroupId]
+        if (group.blockIds.length > 1) {
+          // Check if all group members are already selected
+          const allGroupMembersSelected = group.blockIds.every((blockId) =>
+            updatedNodes.find((n) => n.id === blockId && n.selected)
+          )
+
+          // Only use temporary parent approach if NOT all members are selected
+          // (i.e., when click-and-dragging on an unselected grouped block)
+          if (!allGroupMembersSelected) {
+            // Get the dragged node's absolute position for calculating relative positions
+            const draggedNodeAbsPos = getNodeAbsolutePosition(node.id)
+
+            setNodes((nodes) =>
+              nodes.map((n) => {
+                // Skip the dragged node - it becomes the temporary parent
+                if (n.id === node.id) return n
+
+                // Only process nodes in the same group
+                if (group.blockIds.includes(n.id)) {
+                  // Store original position and parentId for restoration later
+                  groupDragTempParentsRef.current.set(n.id, {
+                    originalPosition: { ...n.position },
+                    originalParentId: n.parentId,
+                  })
+
+                  // Get this node's absolute position
+                  const nodeAbsPos = getNodeAbsolutePosition(n.id)
+
+                  // Calculate position relative to the dragged node
+                  const relativePosition = {
+                    x: nodeAbsPos.x - draggedNodeAbsPos.x,
+                    y: nodeAbsPos.y - draggedNodeAbsPos.y,
+                  }
+
+                  return {
+                    ...n,
+                    parentId: node.id, // Temporarily make this a child of the dragged node
+                    position: relativePosition,
+                    extent: undefined, // Remove extent constraint during drag
+                  }
+                }
+                return n
+              })
+            )
+          }
+        }
+      }
     },
-    [blocks, setDragStartPosition, getNodes, potentialParentId, setPotentialParentId]
+    [blocks, setDragStartPosition, getNodes, setNodes, getGroups, potentialParentId, setPotentialParentId, getNodeAbsolutePosition]
   )
 
   /** Handles node drag stop to establish parent-child relationships. */
@@ -2553,13 +2736,93 @@ const WorkflowContent = React.memo(() => {
     (_event: React.MouseEvent, node: any) => {
       clearDragHighlights()
 
+      // Compute absolute positions for group members before restoring parentIds
+      // We need to do this first because getNodes() will return stale data after setNodes
+      const computedGroupPositions = new Map<string, { x: number; y: number }>()
+      const draggedBlockGroupId = blocks[node.id]?.data?.groupId
+
+      if (groupDragTempParentsRef.current.size > 0) {
+        const draggedNodeAbsPos = getNodeAbsolutePosition(node.id)
+        const currentNodes = getNodes()
+
+        // Compute absolute positions for all temporarily parented nodes
+        for (const [nodeId, _tempData] of groupDragTempParentsRef.current) {
+          const nodeData = currentNodes.find((n) => n.id === nodeId)
+          if (nodeData) {
+            // The node's current position is relative to the dragged node
+            computedGroupPositions.set(nodeId, {
+              x: draggedNodeAbsPos.x + nodeData.position.x,
+              y: draggedNodeAbsPos.y + nodeData.position.y,
+            })
+          }
+        }
+
+        // Also store the dragged node's absolute position
+        computedGroupPositions.set(node.id, draggedNodeAbsPos)
+
+        // Restore temporary parent-child relationships
+        setNodes((nodes) =>
+          nodes.map((n) => {
+            const tempData = groupDragTempParentsRef.current.get(n.id)
+            if (tempData) {
+              const absolutePosition = computedGroupPositions.get(n.id) || n.position
+
+              return {
+                ...n,
+                parentId: tempData.originalParentId,
+                position: absolutePosition,
+                extent: tempData.originalParentId ? ('parent' as const) : undefined,
+              }
+            }
+            return n
+          })
+        )
+        groupDragTempParentsRef.current.clear()
+      }
+
       // Get all selected nodes to update their positions too
       const allNodes = getNodes()
-      const selectedNodes = allNodes.filter((n) => n.selected)
+      let selectedNodes = allNodes.filter((n) => n.selected)
 
-      // If multiple nodes are selected, update all their positions
+      // If the dragged node is in a group, include all group members
+      if (draggedBlockGroupId) {
+        const groups = getGroups()
+        const group = groups[draggedBlockGroupId]
+        if (group && group.blockIds.length > 1) {
+          const groupBlockIds = new Set(group.blockIds)
+          // Include the dragged node and all group members that aren't already selected
+          const groupNodes = allNodes.filter(
+            (n) => groupBlockIds.has(n.id) && !selectedNodes.some((sn) => sn.id === n.id)
+          )
+          selectedNodes = [...selectedNodes, ...groupNodes]
+          // Also ensure the dragged node is included
+          if (!selectedNodes.some((n) => n.id === node.id)) {
+            const draggedNode = allNodes.find((n) => n.id === node.id)
+            if (draggedNode) {
+              selectedNodes = [...selectedNodes, draggedNode]
+            }
+          }
+        }
+      }
+
+      // If multiple nodes are selected (or in a group), update all their positions
       if (selectedNodes.length > 1) {
-        const positionUpdates = computeClampedPositionUpdates(selectedNodes, blocks, allNodes)
+        // Use pre-computed positions for group members, otherwise use computeClampedPositionUpdates
+        let positionUpdates: Array<{ id: string; position: { x: number; y: number } }>
+
+        if (computedGroupPositions.size > 0) {
+          // For group drags, use the pre-computed absolute positions
+          positionUpdates = selectedNodes.map((n) => {
+            const precomputedPos = computedGroupPositions.get(n.id)
+            if (precomputedPos) {
+              return { id: n.id, position: precomputedPos }
+            }
+            // For non-group members, use current position
+            return { id: n.id, position: n.position }
+          })
+        } else {
+          positionUpdates = computeClampedPositionUpdates(selectedNodes, blocks, allNodes)
+        }
         collaborativeBatchUpdatePositions(positionUpdates, {
           previousPositions: multiNodeDragStartRef.current,
         })
@@ -2843,6 +3106,7 @@ const WorkflowContent = React.memo(() => {
     },
     [
       getNodes,
+      setNodes,
       dragStartParentId,
       potentialParentId,
       updateNodeParent,
@@ -2861,6 +3125,7 @@ const WorkflowContent = React.memo(() => {
       activeWorkflowId,
       collaborativeBatchUpdatePositions,
       collaborativeBatchUpdateParent,
+      getGroups,
     ]
   )
 
@@ -3168,19 +3433,81 @@ const WorkflowContent = React.memo(() => {
 
   /**
    * Handles node click to select the node in ReactFlow.
+   * When clicking on a grouped block, also selects all other blocks in the group.
+   * Grouped blocks are marked with isGroupedSelection for different visual styling.
    * Parent-child conflict resolution happens automatically in onNodesChange.
    */
   const handleNodeClick = useCallback(
     (event: React.MouseEvent, node: Node) => {
       const isMultiSelect = event.shiftKey || event.metaKey || event.ctrlKey
-      setNodes((nodes) =>
-        nodes.map((n) => ({
-          ...n,
-          selected: isMultiSelect ? (n.id === node.id ? true : n.selected) : n.id === node.id,
-        }))
-      )
+      const groups = getGroups()
+
+      // Track which nodes are directly clicked vs. group-expanded
+      const directlySelectedIds = new Set<string>()
+
+      setNodes((nodes) => {
+        // First, calculate the base selection
+        let updatedNodes = nodes.map((n) => {
+          const isDirectlySelected = isMultiSelect
+            ? n.id === node.id
+              ? true
+              : n.selected
+            : n.id === node.id
+          if (isDirectlySelected) {
+            directlySelectedIds.add(n.id)
+          }
+          return {
+            ...n,
+            selected: isDirectlySelected,
+            data: {
+              ...n.data,
+              isGroupedSelection: false, // Reset grouped selection flag
+            },
+          }
+        })
+
+        // Expand selection to include all group members
+        const selectedNodeIds = new Set(updatedNodes.filter((n) => n.selected).map((n) => n.id))
+        const groupsToInclude = new Set<string>()
+
+        // Find all groups that have at least one selected member
+        selectedNodeIds.forEach((nodeId) => {
+          const groupId = blocks[nodeId]?.data?.groupId
+          if (groupId && groups[groupId]) {
+            groupsToInclude.add(groupId)
+          }
+        })
+
+        // Add all blocks from those groups to the selection
+        if (groupsToInclude.size > 0) {
+          const expandedNodeIds = new Set(selectedNodeIds)
+          groupsToInclude.forEach((groupId) => {
+            const group = groups[groupId]
+            if (group) {
+              group.blockIds.forEach((blockId) => expandedNodeIds.add(blockId))
+            }
+          })
+
+          // Update nodes with expanded selection, marking group-expanded nodes
+          if (expandedNodeIds.size > selectedNodeIds.size) {
+            updatedNodes = updatedNodes.map((n) => {
+              const isGroupExpanded = expandedNodeIds.has(n.id) && !directlySelectedIds.has(n.id)
+              return {
+                ...n,
+                selected: expandedNodeIds.has(n.id) ? true : n.selected,
+                data: {
+                  ...n.data,
+                  isGroupedSelection: isGroupExpanded,
+                },
+              }
+            })
+          }
+        }
+
+        return updatedNodes
+      })
     },
-    [setNodes]
+    [setNodes, blocks, getGroups]
   )
 
   /** Handles edge selection with container context tracking and Shift-click multi-selection. */
@@ -3415,6 +3742,8 @@ const WorkflowContent = React.memo(() => {
               onRemoveFromSubflow={handleContextRemoveFromSubflow}
               onOpenEditor={handleContextOpenEditor}
               onRename={handleContextRename}
+              onGroupBlocks={handleContextGroupBlocks}
+              onUngroupBlocks={handleContextUngroupBlocks}
               hasClipboard={hasClipboard()}
               showRemoveFromSubflow={contextMenuBlocks.some(
                 (b) => b.parentId && (b.parentType === 'loop' || b.parentType === 'parallel')

apps/sim/blocks/blocks/schedule.ts

@@ -172,7 +172,7 @@ export const ScheduleBlock: BlockConfig = {
         { label: 'Melbourne (UTC+10)', id: 'Australia/Melbourne' },
         { label: 'Auckland (UTC+12)', id: 'Pacific/Auckland' },
       ],
-      value: () => 'UTC',
+      value: () => Intl.DateTimeFormat().resolvedOptions().timeZone,
       required: false,
       mode: 'trigger',
       condition: { field: 'scheduleType', value: ['minutes', 'hourly'], not: true },

apps/sim/hooks/use-collaborative-workflow.ts

@@ -424,6 +424,35 @@ export function useCollaborativeWorkflow() {
               logger.info('Successfully applied batch-update-parent from remote user')
               break
             }
+            case BLOCKS_OPERATIONS.GROUP_BLOCKS: {
+              const { blockIds, groupId } = payload
+              logger.info('Received group-blocks from remote user', {
+                userId,
+                groupId,
+                blockCount: (blockIds || []).length,
+              })
+
+              if (blockIds && blockIds.length > 0 && groupId) {
+                workflowStore.groupBlocks(blockIds, groupId)
+              }
+
+              logger.info('Successfully applied group-blocks from remote user')
+              break
+            }
+            case BLOCKS_OPERATIONS.UNGROUP_BLOCKS: {
+              const { groupId } = payload
+              logger.info('Received ungroup-blocks from remote user', {
+                userId,
+                groupId,
+              })
+
+              if (groupId) {
+                workflowStore.ungroupBlocks(groupId)
+              }
+
+              logger.info('Successfully applied ungroup-blocks from remote user')
+              break
+            }
           }
         }
       } catch (error) {
@@ -1584,6 +1613,83 @@ export function useCollaborativeWorkflow() {
     ]
   )
 
+  const collaborativeGroupBlocks = useCallback(
+    (blockIds: string[]) => {
+      if (!isInActiveRoom()) {
+        logger.debug('Skipping group blocks - not in active workflow')
+        return null
+      }
+
+      if (blockIds.length < 2) {
+        logger.debug('Cannot group fewer than 2 blocks')
+        return null
+      }
+
+      const groupId = crypto.randomUUID()
+
+      const operationId = crypto.randomUUID()
+
+      addToQueue({
+        id: operationId,
+        operation: {
+          operation: BLOCKS_OPERATIONS.GROUP_BLOCKS,
+          target: OPERATION_TARGETS.BLOCKS,
+          payload: { blockIds, groupId },
+        },
+        workflowId: activeWorkflowId || '',
+        userId: session?.user?.id || 'unknown',
+      })
+
+      workflowStore.groupBlocks(blockIds, groupId)
+
+      undoRedo.recordGroupBlocks(blockIds, groupId)
+
+      logger.info('Grouped blocks collaboratively', { groupId, blockCount: blockIds.length })
+      return groupId
+    },
+    [addToQueue, activeWorkflowId, session?.user?.id, isInActiveRoom, workflowStore, undoRedo]
+  )
+
+  const collaborativeUngroupBlocks = useCallback(
+    (groupId: string) => {
+      if (!isInActiveRoom()) {
+        logger.debug('Skipping ungroup blocks - not in active workflow')
+        return []
+      }
+
+      const groups = workflowStore.getGroups()
+      const group = groups[groupId]
+
+      if (!group) {
+        logger.warn('Cannot ungroup - group not found', { groupId })
+        return []
+      }
+
+      const blockIds = [...group.blockIds]
+
+      const operationId = crypto.randomUUID()
+
+      addToQueue({
+        id: operationId,
+        operation: {
+          operation: BLOCKS_OPERATIONS.UNGROUP_BLOCKS,
+          target: OPERATION_TARGETS.BLOCKS,
+          payload: { groupId, blockIds },
+        },
+        workflowId: activeWorkflowId || '',
+        userId: session?.user?.id || 'unknown',
+      })
+
+      workflowStore.ungroupBlocks(groupId)
+
+      undoRedo.recordUngroupBlocks(groupId, blockIds)
+
+      logger.info('Ungrouped blocks collaboratively', { groupId, blockCount: blockIds.length })
+      return blockIds
+    },
+    [addToQueue, activeWorkflowId, session?.user?.id, isInActiveRoom, workflowStore, undoRedo]
+  )
+
   return {
     // Connection status
     isConnected,
@@ -1622,6 +1728,10 @@ export function useCollaborativeWorkflow() {
     collaborativeUpdateIterationCount,
     collaborativeUpdateIterationCollection,
 
+    // Collaborative block group operations
+    collaborativeGroupBlocks,
+    collaborativeUngroupBlocks,
+
     // Direct access to stores for non-collaborative operations
     workflowStore,
     subBlockStore,

apps/sim/hooks/use-undo-redo.ts

@@ -22,7 +22,9 @@ import {
   type BatchToggleHandlesOperation,
   type BatchUpdateParentOperation,
   createOperationEntry,
+  type GroupBlocksOperation,
   runWithUndoRedoRecordingSuspended,
+  type UngroupBlocksOperation,
   type UpdateParentOperation,
   useUndoRedoStore,
 } from '@/stores/undo-redo'
@@ -874,6 +876,46 @@ export function useUndoRedo() {
           })
           break
         }
+        case UNDO_REDO_OPERATIONS.GROUP_BLOCKS: {
+          // Undoing group = ungroup (inverse is ungroup operation)
+          const inverseOp = entry.inverse as unknown as UngroupBlocksOperation
+          const { groupId } = inverseOp.data
+
+          addToQueue({
+            id: opId,
+            operation: {
+              operation: BLOCKS_OPERATIONS.UNGROUP_BLOCKS,
+              target: OPERATION_TARGETS.BLOCKS,
+              payload: { groupId, blockIds: inverseOp.data.blockIds },
+            },
+            workflowId: activeWorkflowId,
+            userId,
+          })
+
+          workflowStore.ungroupBlocks(groupId)
+          logger.debug('Undid group blocks', { groupId })
+          break
+        }
+        case UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS: {
+          // Undoing ungroup = re-group (inverse is group operation)
+          const inverseOp = entry.inverse as unknown as GroupBlocksOperation
+          const { groupId, blockIds } = inverseOp.data
+
+          addToQueue({
+            id: opId,
+            operation: {
+              operation: BLOCKS_OPERATIONS.GROUP_BLOCKS,
+              target: OPERATION_TARGETS.BLOCKS,
+              payload: { groupId, blockIds },
+            },
+            workflowId: activeWorkflowId,
+            userId,
+          })
+
+          workflowStore.groupBlocks(blockIds, groupId)
+          logger.debug('Undid ungroup blocks', { groupId })
+          break
+        }
         case UNDO_REDO_OPERATIONS.APPLY_DIFF: {
           const applyDiffInverse = entry.inverse as any
           const { baselineSnapshot } = applyDiffInverse.data
@@ -1482,6 +1524,46 @@ export function useUndoRedo() {
           })
           break
         }
+        case UNDO_REDO_OPERATIONS.GROUP_BLOCKS: {
+          // Redo group = group again
+          const groupOp = entry.operation as GroupBlocksOperation
+          const { groupId, blockIds } = groupOp.data
+
+          addToQueue({
+            id: opId,
+            operation: {
+              operation: BLOCKS_OPERATIONS.GROUP_BLOCKS,
+              target: OPERATION_TARGETS.BLOCKS,
+              payload: { groupId, blockIds },
+            },
+            workflowId: activeWorkflowId,
+            userId,
+          })
+
+          workflowStore.groupBlocks(blockIds, groupId)
+          logger.debug('Redid group blocks', { groupId })
+          break
+        }
+        case UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS: {
+          // Redo ungroup = ungroup again
+          const ungroupOp = entry.operation as UngroupBlocksOperation
+          const { groupId } = ungroupOp.data
+
+          addToQueue({
+            id: opId,
+            operation: {
+              operation: BLOCKS_OPERATIONS.UNGROUP_BLOCKS,
+              target: OPERATION_TARGETS.BLOCKS,
+              payload: { groupId, blockIds: ungroupOp.data.blockIds },
+            },
+            workflowId: activeWorkflowId,
+            userId,
+          })
+
+          workflowStore.ungroupBlocks(groupId)
+          logger.debug('Redid ungroup blocks', { groupId })
+          break
+        }
         case UNDO_REDO_OPERATIONS.APPLY_DIFF: {
           // Redo apply-diff means re-applying the proposed state with diff markers
           const applyDiffOp = entry.operation as any
@@ -1793,6 +1875,66 @@ export function useUndoRedo() {
     [activeWorkflowId, userId, undoRedoStore]
   )
 
+  const recordGroupBlocks = useCallback(
+    (blockIds: string[], groupId: string) => {
+      if (!activeWorkflowId || blockIds.length === 0) return
+
+      const operation: GroupBlocksOperation = {
+        id: crypto.randomUUID(),
+        type: UNDO_REDO_OPERATIONS.GROUP_BLOCKS,
+        timestamp: Date.now(),
+        workflowId: activeWorkflowId,
+        userId,
+        data: { groupId, blockIds },
+      }
+
+      const inverse: UngroupBlocksOperation = {
+        id: crypto.randomUUID(),
+        type: UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS,
+        timestamp: Date.now(),
+        workflowId: activeWorkflowId,
+        userId,
+        data: { groupId, blockIds },
+      }
+
+      const entry = createOperationEntry(operation, inverse)
+      undoRedoStore.push(activeWorkflowId, userId, entry)
+
+      logger.debug('Recorded group blocks', { groupId, blockCount: blockIds.length })
+    },
+    [activeWorkflowId, userId, undoRedoStore]
+  )
+
+  const recordUngroupBlocks = useCallback(
+    (groupId: string, blockIds: string[], parentGroupId?: string) => {
+      if (!activeWorkflowId || blockIds.length === 0) return
+
+      const operation: UngroupBlocksOperation = {
+        id: crypto.randomUUID(),
+        type: UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS,
+        timestamp: Date.now(),
+        workflowId: activeWorkflowId,
+        userId,
+        data: { groupId, blockIds, parentGroupId },
+      }
+
+      const inverse: GroupBlocksOperation = {
+        id: crypto.randomUUID(),
+        type: UNDO_REDO_OPERATIONS.GROUP_BLOCKS,
+        timestamp: Date.now(),
+        workflowId: activeWorkflowId,
+        userId,
+        data: { groupId, blockIds },
+      }
+
+      const entry = createOperationEntry(operation, inverse)
+      undoRedoStore.push(activeWorkflowId, userId, entry)
+
+      logger.debug('Recorded ungroup blocks', { groupId, blockCount: blockIds.length })
+    },
+    [activeWorkflowId, userId, undoRedoStore]
+  )
+
   return {
     recordBatchAddBlocks,
     recordBatchRemoveBlocks,
@@ -1806,6 +1948,8 @@ export function useUndoRedo() {
     recordApplyDiff,
     recordAcceptDiff,
     recordRejectDiff,
+    recordGroupBlocks,
+    recordUngroupBlocks,
     undo,
     redo,
     getStackSizes,

apps/sim/lib/workflows/autolayout/index.ts

@@ -16,9 +16,61 @@ import type { BlockState } from '@/stores/workflows/workflow/types'
 
 const logger = createLogger('AutoLayout')
 
+/** Default block dimensions for layout calculations */
+const DEFAULT_BLOCK_WIDTH = 250
+const DEFAULT_BLOCK_HEIGHT = 100
+
+/**
+ * Identifies groups from blocks and calculates their bounding boxes.
+ * Returns a map of groupId to group info including bounding box and member block IDs.
+ */
+function identifyGroups(blocks: Record<string, BlockState>): Map<
+  string,
+  {
+    blockIds: string[]
+    bounds: { minX: number; minY: number; maxX: number; maxY: number }
+  }
+> {
+  const groups = new Map<
+    string,
+    {
+      blockIds: string[]
+      bounds: { minX: number; minY: number; maxX: number; maxY: number }
+    }
+  >()
+
+  // Group blocks by their groupId
+  for (const [blockId, block] of Object.entries(blocks)) {
+    const groupId = block.data?.groupId
+    if (!groupId) continue
+
+    if (!groups.has(groupId)) {
+      groups.set(groupId, {
+        blockIds: [],
+        bounds: { minX: Infinity, minY: Infinity, maxX: -Infinity, maxY: -Infinity },
+      })
+    }
+
+    const group = groups.get(groupId)!
+    group.blockIds.push(blockId)
+
+    // Update bounding box
+    const blockWidth = block.data?.width ?? DEFAULT_BLOCK_WIDTH
+    const blockHeight = block.data?.height ?? block.height ?? DEFAULT_BLOCK_HEIGHT
+
+    group.bounds.minX = Math.min(group.bounds.minX, block.position.x)
+    group.bounds.minY = Math.min(group.bounds.minY, block.position.y)
+    group.bounds.maxX = Math.max(group.bounds.maxX, block.position.x + blockWidth)
+    group.bounds.maxY = Math.max(group.bounds.maxY, block.position.y + blockHeight)
+  }
+
+  return groups
+}
+
 /**
  * Applies automatic layout to all blocks in a workflow.
  * Positions blocks in layers based on their connections (edges).
+ * Groups are treated as single units and laid out together.
  */
 export function applyAutoLayout(
   blocks: Record<string, BlockState>,
@@ -36,6 +88,11 @@ export function applyAutoLayout(
     const horizontalSpacing = options.horizontalSpacing ?? DEFAULT_HORIZONTAL_SPACING
     const verticalSpacing = options.verticalSpacing ?? DEFAULT_VERTICAL_SPACING
 
+    // Identify groups and their bounding boxes
+    const groups = identifyGroups(blocksCopy)
+
+    logger.info('Identified block groups for layout', { groupCount: groups.size })
+
     // Pre-calculate container dimensions by laying out their children (bottom-up)
     // This ensures accurate widths/heights before root-level layout
     prepareContainerDimensions(
@@ -49,19 +106,112 @@ export function applyAutoLayout(
     const { root: rootBlockIds } = getBlocksByParent(blocksCopy)
     const layoutRootIds = filterLayoutEligibleBlockIds(rootBlockIds, blocksCopy)
 
-    const rootBlocks: Record<string, BlockState> = {}
-    for (const id of layoutRootIds) {
-      rootBlocks[id] = blocksCopy[id]
+    // For groups, we need to:
+    // 1. Create virtual blocks representing each group
+    // 2. Replace grouped blocks with their group's virtual block
+    // 3. Layout the virtual blocks + ungrouped blocks
+    // 4. Apply position deltas to grouped blocks
+
+    // Track which blocks are in groups at root level
+    const groupedRootBlockIds = new Set<string>()
+    const groupRepresentatives = new Map<string, string>() // groupId -> representative blockId
+
+    // Store ORIGINAL positions of all grouped blocks before any modifications
+    const originalBlockPositions = new Map<string, { x: number; y: number }>()
+    for (const [_groupId, group] of groups) {
+      for (const blockId of group.blockIds) {
+        if (blocksCopy[blockId]) {
+          originalBlockPositions.set(blockId, { ...blocksCopy[blockId].position })
+        }
+      }
     }
 
-    const rootEdges = edges.filter(
-      (edge) => layoutRootIds.includes(edge.source) && layoutRootIds.includes(edge.target)
-    )
+    for (const [groupId, group] of groups) {
+      // Find if any blocks in this group are at root level
+      const rootGroupBlocks = group.blockIds.filter((id) => layoutRootIds.includes(id))
+      if (rootGroupBlocks.length > 0) {
+        // Mark all blocks in this group as grouped
+        for (const blockId of rootGroupBlocks) {
+          groupedRootBlockIds.add(blockId)
+        }
+        // Use the first block as the group's representative for layout
+        const representativeId = rootGroupBlocks[0]
+        groupRepresentatives.set(groupId, representativeId)
+
+        // Update the representative block's dimensions to match the group's bounding box
+        const bounds = group.bounds
+        const groupWidth = bounds.maxX - bounds.minX
+        const groupHeight = bounds.maxY - bounds.minY
+
+        blocksCopy[representativeId] = {
+          ...blocksCopy[representativeId],
+          data: {
+            ...blocksCopy[representativeId].data,
+            width: groupWidth,
+            height: groupHeight,
+          },
+          // Position at the group's top-left corner
+          position: { x: bounds.minX, y: bounds.minY },
+        }
+      }
+    }
+
+    // Build the blocks to layout: ungrouped blocks + group representatives
+    const rootBlocks: Record<string, BlockState> = {}
+    for (const id of layoutRootIds) {
+      // Skip grouped blocks that aren't representatives
+      if (groupedRootBlockIds.has(id)) {
+        // Only include if this is a group representative
+        for (const [groupId, repId] of groupRepresentatives) {
+          if (repId === id) {
+            rootBlocks[id] = blocksCopy[id]
+            break
+          }
+        }
+      } else {
+        rootBlocks[id] = blocksCopy[id]
+      }
+    }
+
+    // Remap edges: edges involving grouped blocks should connect to the representative
+    const blockToGroup = new Map<string, string>() // blockId -> groupId
+    for (const [groupId, group] of groups) {
+      for (const blockId of group.blockIds) {
+        blockToGroup.set(blockId, groupId)
+      }
+    }
+
+    const layoutBlockIds = new Set(Object.keys(rootBlocks))
+    const rootEdges = edges
+      .map((edge) => {
+        let source = edge.source
+        let target = edge.target
+
+        // Remap source if it's in a group
+        const sourceGroupId = blockToGroup.get(source)
+        if (sourceGroupId && groupRepresentatives.has(sourceGroupId)) {
+          source = groupRepresentatives.get(sourceGroupId)!
+        }
+
+        // Remap target if it's in a group
+        const targetGroupId = blockToGroup.get(target)
+        if (targetGroupId && groupRepresentatives.has(targetGroupId)) {
+          target = groupRepresentatives.get(targetGroupId)!
+        }
+
+        return { ...edge, source, target }
+      })
+      .filter((edge) => layoutBlockIds.has(edge.source) && layoutBlockIds.has(edge.target))
 
     // Calculate subflow depths before laying out root blocks
-    // This ensures blocks connected to subflow ends are positioned correctly
     const subflowDepths = calculateSubflowDepths(blocksCopy, edges, assignLayers)
 
+    // Store old positions for groups to calculate deltas
+    const oldGroupPositions = new Map<string, { x: number; y: number }>()
+    for (const [groupId, repId] of groupRepresentatives) {
+      oldGroupPositions.set(groupId, { ...blocksCopy[repId].position })
+    }
+
     if (Object.keys(rootBlocks).length > 0) {
       const { nodes } = layoutBlocksCore(rootBlocks, rootEdges, {
         isContainer: false,
@@ -69,15 +219,49 @@ export function applyAutoLayout(
         subflowDepths,
       })
 
+      // Apply positions to ungrouped blocks and group representatives
       for (const node of nodes.values()) {
         blocksCopy[node.id].position = node.position
       }
+
+      // For each group, calculate the delta and apply to ALL blocks in the group
+      for (const [groupId, repId] of groupRepresentatives) {
+        const oldGroupTopLeft = oldGroupPositions.get(groupId)!
+        const newGroupTopLeft = blocksCopy[repId].position
+        const deltaX = newGroupTopLeft.x - oldGroupTopLeft.x
+        const deltaY = newGroupTopLeft.y - oldGroupTopLeft.y
+
+        const group = groups.get(groupId)!
+        // Apply delta to ALL blocks in the group using their ORIGINAL positions
+        for (const blockId of group.blockIds) {
+          if (layoutRootIds.includes(blockId)) {
+            const originalPos = originalBlockPositions.get(blockId)
+            if (originalPos) {
+              blocksCopy[blockId].position = {
+                x: originalPos.x + deltaX,
+                y: originalPos.y + deltaY,
+              }
+            }
+          }
+        }
+
+        // Restore the representative's original dimensions
+        const originalBlock = blocks[repId]
+        if (originalBlock) {
+          blocksCopy[repId].data = {
+            ...blocksCopy[repId].data,
+            width: originalBlock.data?.width,
+            height: originalBlock.data?.height,
+          }
+        }
+      }
     }
 
     layoutContainers(blocksCopy, edges, options)
 
     logger.info('Auto layout completed successfully', {
       blockCount: Object.keys(blocksCopy).length,
+      groupCount: groups.size,
     })
 
     return {

apps/sim/lib/workflows/autolayout/targeted.ts

@@ -26,9 +26,53 @@ export interface TargetedLayoutOptions extends LayoutOptions {
   horizontalSpacing?: number
 }
 
+/**
+ * Identifies block groups from the blocks' groupId data.
+ * Returns a map of groupId to array of block IDs in that group.
+ */
+function identifyBlockGroups(blocks: Record<string, BlockState>): Map<string, string[]> {
+  const groups = new Map<string, string[]>()
+
+  for (const [blockId, block] of Object.entries(blocks)) {
+    const groupId = block.data?.groupId
+    if (!groupId) continue
+
+    if (!groups.has(groupId)) {
+      groups.set(groupId, [])
+    }
+    groups.get(groupId)!.push(blockId)
+  }
+
+  return groups
+}
+
+/**
+ * Expands changed block IDs to include all blocks in the same group.
+ * If any block in a group changed, all blocks in that group should be treated as changed.
+ */
+function expandChangedToGroups(
+  changedBlockIds: string[],
+  blockGroups: Map<string, string[]>,
+  blocks: Record<string, BlockState>
+): Set<string> {
+  const expandedSet = new Set(changedBlockIds)
+
+  for (const blockId of changedBlockIds) {
+    const groupId = blocks[blockId]?.data?.groupId
+    if (groupId && blockGroups.has(groupId)) {
+      for (const groupBlockId of blockGroups.get(groupId)!) {
+        expandedSet.add(groupBlockId)
+      }
+    }
+  }
+
+  return expandedSet
+}
+
 /**
  * Applies targeted layout to only reposition changed blocks.
  * Unchanged blocks act as anchors to preserve existing layout.
+ * Blocks in groups are moved together as a unit.
  */
 export function applyTargetedLayout(
   blocks: Record<string, BlockState>,
@@ -45,9 +89,14 @@ export function applyTargetedLayout(
     return blocks
   }
 
-  const changedSet = new Set(changedBlockIds)
   const blocksCopy: Record<string, BlockState> = JSON.parse(JSON.stringify(blocks))
 
+  // Identify block groups
+  const blockGroups = identifyBlockGroups(blocksCopy)
+
+  // Expand changed set to include all blocks in affected groups
+  const changedSet = expandChangedToGroups(changedBlockIds, blockGroups, blocksCopy)
+
   // Pre-calculate container dimensions by laying out their children (bottom-up)
   // This ensures accurate widths/heights before root-level layout
   prepareContainerDimensions(
@@ -71,7 +120,8 @@ export function applyTargetedLayout(
     changedSet,
     verticalSpacing,
     horizontalSpacing,
-    subflowDepths
+    subflowDepths,
+    blockGroups
   )
 
   for (const [parentId, childIds] of groups.children.entries()) {
@@ -83,7 +133,8 @@ export function applyTargetedLayout(
       changedSet,
       verticalSpacing,
       horizontalSpacing,
-      subflowDepths
+      subflowDepths,
+      blockGroups
     )
   }
 
@@ -92,6 +143,7 @@ export function applyTargetedLayout(
 
 /**
  * Layouts a group of blocks (either root level or within a container)
+ * Blocks in block groups are moved together as a unit.
  */
 function layoutGroup(
   parentId: string | null,
@@ -101,7 +153,8 @@ function layoutGroup(
   changedSet: Set<string>,
   verticalSpacing: number,
   horizontalSpacing: number,
-  subflowDepths: Map<string, number>
+  subflowDepths: Map<string, number>,
+  blockGroups: Map<string, string[]>
 ): void {
   if (childIds.length === 0) return
 
@@ -141,7 +194,7 @@ function layoutGroup(
     return
   }
 
-  // Store old positions for anchor calculation
+  // Store old positions for anchor calculation and group delta tracking
   const oldPositions = new Map<string, { x: number; y: number }>()
   for (const id of layoutEligibleChildIds) {
     const block = blocks[id]
@@ -185,14 +238,47 @@ function layoutGroup(
     }
   }
 
+  // Track which groups have already had their deltas applied
+  const processedGroups = new Set<string>()
+
   // Apply new positions only to blocks that need layout
   for (const id of needsLayout) {
     const block = blocks[id]
     const newPos = layoutPositions.get(id)
     if (!block || !newPos) continue
-    block.position = {
-      x: newPos.x + offsetX,
-      y: newPos.y + offsetY,
+
+    const groupId = block.data?.groupId
+
+    // If this block is in a group, move all blocks in the group together
+    if (groupId && blockGroups.has(groupId) && !processedGroups.has(groupId)) {
+      processedGroups.add(groupId)
+
+      // Calculate the delta for this block (the one that needs layout)
+      const oldPos = oldPositions.get(id)
+      if (oldPos) {
+        const deltaX = newPos.x + offsetX - oldPos.x
+        const deltaY = newPos.y + offsetY - oldPos.y
+
+        // Apply delta to ALL blocks in the group using their original positions
+        for (const groupBlockId of blockGroups.get(groupId)!) {
+          const groupBlock = blocks[groupBlockId]
+          if (groupBlock && layoutEligibleChildIds.includes(groupBlockId)) {
+            const groupOriginalPos = oldPositions.get(groupBlockId)
+            if (groupOriginalPos) {
+              groupBlock.position = {
+                x: groupOriginalPos.x + deltaX,
+                y: groupOriginalPos.y + deltaY,
+              }
+            }
+          }
+        }
+      }
+    } else if (!groupId) {
+      // Non-grouped block - apply position normally
+      block.position = {
+        x: newPos.x + offsetX,
+        y: newPos.y + offsetY,
+      }
     }
   }
 }

apps/sim/lib/workflows/autolayout/utils.ts

@@ -41,11 +41,18 @@ export function isContainerType(blockType: string): boolean {
 }
 
 /**
- * Checks if a block should be excluded from autolayout
+ * Checks if a block should be excluded from autolayout.
+ * Note blocks are excluded unless they are part of a group.
  */
-export function shouldSkipAutoLayout(block?: BlockState): boolean {
+export function shouldSkipAutoLayout(block?: BlockState, isInGroup?: boolean): boolean {
   if (!block) return true
-  return AUTO_LAYOUT_EXCLUDED_TYPES.has(block.type)
+  // If the block type is normally excluded (e.g., note), but it's in a group, include it
+  if (AUTO_LAYOUT_EXCLUDED_TYPES.has(block.type)) {
+    // Check if block is in a group - if so, include it in layout
+    const blockIsInGroup = isInGroup ?? !!block.data?.groupId
+    return !blockIsInGroup
+  }
+  return false
 }
 
 /**

apps/sim/lib/workflows/diff/diff-engine.ts

@@ -1174,5 +1174,6 @@ export function stripWorkflowDiffMarkers(state: WorkflowState): WorkflowState {
     edges: structuredClone(state.edges || []),
     loops: structuredClone(state.loops || {}),
     parallels: structuredClone(state.parallels || {}),
+    groups: structuredClone(state.groups || {}),
   }
 }

apps/sim/socket/constants.ts

@@ -16,6 +16,8 @@ export const BLOCKS_OPERATIONS = {
   BATCH_TOGGLE_ENABLED: 'batch-toggle-enabled',
   BATCH_TOGGLE_HANDLES: 'batch-toggle-handles',
   BATCH_UPDATE_PARENT: 'batch-update-parent',
+  GROUP_BLOCKS: 'group-blocks',
+  UNGROUP_BLOCKS: 'ungroup-blocks',
 } as const
 
 export type BlocksOperation = (typeof BLOCKS_OPERATIONS)[keyof typeof BLOCKS_OPERATIONS]
@@ -87,6 +89,8 @@ export const UNDO_REDO_OPERATIONS = {
   APPLY_DIFF: 'apply-diff',
   ACCEPT_DIFF: 'accept-diff',
   REJECT_DIFF: 'reject-diff',
+  GROUP_BLOCKS: 'group-blocks',
+  UNGROUP_BLOCKS: 'ungroup-blocks',
 } as const
 
 export type UndoRedoOperation = (typeof UNDO_REDO_OPERATIONS)[keyof typeof UNDO_REDO_OPERATIONS]

apps/sim/socket/database/operations.ts

@@ -810,6 +810,104 @@ async function handleBlocksOperationTx(
       break
     }
 
+    case BLOCKS_OPERATIONS.GROUP_BLOCKS: {
+      const { blockIds, groupId } = payload
+      if (!Array.isArray(blockIds) || blockIds.length === 0 || !groupId) {
+        logger.debug('Invalid payload for group blocks operation')
+        return
+      }
+
+      logger.info(`Grouping ${blockIds.length} blocks into group ${groupId} in workflow ${workflowId}`)
+
+      // Update blocks: set groupId and push to groupStack
+      for (const blockId of blockIds) {
+        const [currentBlock] = await tx
+          .select({ data: workflowBlocks.data })
+          .from(workflowBlocks)
+          .where(and(eq(workflowBlocks.id, blockId), eq(workflowBlocks.workflowId, workflowId)))
+          .limit(1)
+
+        if (!currentBlock) {
+          logger.warn(`Block ${blockId} not found for grouping`)
+          continue
+        }
+
+        const currentData = (currentBlock?.data || {}) as Record<string, any>
+        const currentStack = Array.isArray(currentData.groupStack) ? currentData.groupStack : []
+        const updatedData = {
+          ...currentData,
+          groupId,
+          groupStack: [...currentStack, groupId],
+        }
+
+        await tx
+          .update(workflowBlocks)
+          .set({
+            data: updatedData,
+            updatedAt: new Date(),
+          })
+          .where(and(eq(workflowBlocks.id, blockId), eq(workflowBlocks.workflowId, workflowId)))
+      }
+
+      logger.debug(`Grouped ${blockIds.length} blocks into group ${groupId}`)
+      break
+    }
+
+    case BLOCKS_OPERATIONS.UNGROUP_BLOCKS: {
+      const { groupId, blockIds } = payload
+      if (!groupId || !Array.isArray(blockIds)) {
+        logger.debug('Invalid payload for ungroup blocks operation')
+        return
+      }
+
+      logger.info(`Ungrouping ${blockIds.length} blocks from group ${groupId} in workflow ${workflowId}`)
+
+      // Update blocks: pop from groupStack and set groupId to the previous level
+      for (const blockId of blockIds) {
+        const [currentBlock] = await tx
+          .select({ data: workflowBlocks.data })
+          .from(workflowBlocks)
+          .where(and(eq(workflowBlocks.id, blockId), eq(workflowBlocks.workflowId, workflowId)))
+          .limit(1)
+
+        if (!currentBlock) {
+          logger.warn(`Block ${blockId} not found for ungrouping`)
+          continue
+        }
+
+        const currentData = (currentBlock?.data || {}) as Record<string, any>
+        const currentStack = Array.isArray(currentData.groupStack) ? [...currentData.groupStack] : []
+
+        // Pop the current groupId from the stack
+        if (currentStack.length > 0 && currentStack[currentStack.length - 1] === groupId) {
+          currentStack.pop()
+        }
+
+        // The new groupId is the top of the remaining stack, or undefined if empty
+        const newGroupId = currentStack.length > 0 ? currentStack[currentStack.length - 1] : undefined
+
+        let updatedData: Record<string, any>
+        if (newGroupId) {
+          updatedData = { ...currentData, groupId: newGroupId, groupStack: currentStack }
+        } else {
+          // Remove groupId and groupStack if stack is empty
+          const { groupId: _removed, groupStack: _removedStack, ...restData } = currentData
+          updatedData = restData
+        }
+
+        await tx
+          .update(workflowBlocks)
+          .set({
+            data: updatedData,
+            updatedAt: new Date(),
+          })
+          .where(and(eq(workflowBlocks.id, blockId), eq(workflowBlocks.workflowId, workflowId)))
+      }
+
+      logger.debug(`Ungrouped ${blockIds.length} blocks from group ${groupId}`)
+      break
+    }
+
     default:
       throw new Error(`Unsupported blocks operation: ${operation}`)
   }

apps/sim/socket/handlers/operations.ts

@@ -465,6 +465,70 @@ export function setupOperationsHandlers(
         return
       }
 
+      if (
+        target === OPERATION_TARGETS.BLOCKS &&
+        operation === BLOCKS_OPERATIONS.GROUP_BLOCKS
+      ) {
+        await persistWorkflowOperation(workflowId, {
+          operation,
+          target,
+          payload,
+          timestamp: operationTimestamp,
+          userId: session.userId,
+        })
+
+        room.lastModified = Date.now()
+
+        socket.to(workflowId).emit('workflow-operation', {
+          operation,
+          target,
+          payload,
+          timestamp: operationTimestamp,
+          senderId: socket.id,
+          userId: session.userId,
+          userName: session.userName,
+          metadata: { workflowId, operationId: crypto.randomUUID() },
+        })
+
+        if (operationId) {
+          socket.emit('operation-confirmed', { operationId, serverTimestamp: Date.now() })
+        }
+
+        return
+      }
+
+      if (
+        target === OPERATION_TARGETS.BLOCKS &&
+        operation === BLOCKS_OPERATIONS.UNGROUP_BLOCKS
+      ) {
+        await persistWorkflowOperation(workflowId, {
+          operation,
+          target,
+          payload,
+          timestamp: operationTimestamp,
+          userId: session.userId,
+        })
+
+        room.lastModified = Date.now()
+
+        socket.to(workflowId).emit('workflow-operation', {
+          operation,
+          target,
+          payload,
+          timestamp: operationTimestamp,
+          senderId: socket.id,
+          userId: session.userId,
+          userName: session.userName,
+          metadata: { workflowId, operationId: crypto.randomUUID() },
+        })
+
+        if (operationId) {
+          socket.emit('operation-confirmed', { operationId, serverTimestamp: Date.now() })
+        }
+
+        return
+      }
+
       if (target === OPERATION_TARGETS.EDGES && operation === EDGES_OPERATIONS.BATCH_ADD_EDGES) {
         await persistWorkflowOperation(workflowId, {
           operation,

apps/sim/socket/middleware/permissions.ts

@@ -30,6 +30,8 @@ const WRITE_OPERATIONS: string[] = [
   BLOCKS_OPERATIONS.BATCH_TOGGLE_ENABLED,
   BLOCKS_OPERATIONS.BATCH_TOGGLE_HANDLES,
   BLOCKS_OPERATIONS.BATCH_UPDATE_PARENT,
+  BLOCKS_OPERATIONS.GROUP_BLOCKS,
+  BLOCKS_OPERATIONS.UNGROUP_BLOCKS,
   // Edge operations
   EDGE_OPERATIONS.ADD,
   EDGE_OPERATIONS.REMOVE,

apps/sim/socket/validation/schemas.ts

@@ -221,6 +221,30 @@ export const BatchUpdateParentSchema = z.object({
   operationId: z.string().optional(),
 })
 
+export const GroupBlocksSchema = z.object({
+  operation: z.literal(BLOCKS_OPERATIONS.GROUP_BLOCKS),
+  target: z.literal(OPERATION_TARGETS.BLOCKS),
+  payload: z.object({
+    blockIds: z.array(z.string()),
+    groupId: z.string(),
+    name: z.string().optional(),
+  }),
+  timestamp: z.number(),
+  operationId: z.string().optional(),
+})
+
+export const UngroupBlocksSchema = z.object({
+  operation: z.literal(BLOCKS_OPERATIONS.UNGROUP_BLOCKS),
+  target: z.literal(OPERATION_TARGETS.BLOCKS),
+  payload: z.object({
+    groupId: z.string(),
+    blockIds: z.array(z.string()),
+    parentGroupId: z.string().optional(),
+  }),
+  timestamp: z.number(),
+  operationId: z.string().optional(),
+})
+
 export const WorkflowOperationSchema = z.union([
   BlockOperationSchema,
   BatchPositionUpdateSchema,
@@ -229,6 +253,8 @@ export const WorkflowOperationSchema = z.union([
   BatchToggleEnabledSchema,
   BatchToggleHandlesSchema,
   BatchUpdateParentSchema,
+  GroupBlocksSchema,
+  UngroupBlocksSchema,
   EdgeOperationSchema,
   BatchAddEdgesSchema,
   BatchRemoveEdgesSchema,

apps/sim/stores/copilot-training/store.ts

@@ -25,6 +25,7 @@ function captureWorkflowSnapshot(): WorkflowState {
     edges: rawState.edges || [],
     loops: rawState.loops || {},
     parallels: rawState.parallels || {},
+    groups: rawState.groups || {},
     lastSaved: Date.now(),
   }
 }

apps/sim/stores/undo-redo/types.ts

@@ -126,6 +126,23 @@ export interface RejectDiffOperation extends BaseOperation {
   }
 }
 
+export interface GroupBlocksOperation extends BaseOperation {
+  type: typeof UNDO_REDO_OPERATIONS.GROUP_BLOCKS
+  data: {
+    groupId: string
+    blockIds: string[]
+  }
+}
+
+export interface UngroupBlocksOperation extends BaseOperation {
+  type: typeof UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS
+  data: {
+    groupId: string
+    blockIds: string[]
+    parentGroupId?: string
+  }
+}
+
 export type Operation =
   | BatchAddBlocksOperation
   | BatchRemoveBlocksOperation
@@ -139,6 +156,8 @@ export type Operation =
   | ApplyDiffOperation
   | AcceptDiffOperation
   | RejectDiffOperation
+  | GroupBlocksOperation
+  | UngroupBlocksOperation
 
 export interface OperationEntry {
   id: string

apps/sim/stores/undo-redo/utils.ts

@@ -6,8 +6,10 @@ import type {
   BatchRemoveBlocksOperation,
   BatchRemoveEdgesOperation,
   BatchUpdateParentOperation,
+  GroupBlocksOperation,
   Operation,
   OperationEntry,
+  UngroupBlocksOperation,
 } from '@/stores/undo-redo/types'
 
 export function createOperationEntry(operation: Operation, inverse: Operation): OperationEntry {
@@ -164,6 +166,30 @@ export function createInverseOperation(operation: Operation): Operation {
         },
       }
 
+    case UNDO_REDO_OPERATIONS.GROUP_BLOCKS: {
+      const op = operation as GroupBlocksOperation
+      return {
+        ...operation,
+        type: UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS,
+        data: {
+          groupId: op.data.groupId,
+          blockIds: op.data.blockIds,
+        },
+      } as UngroupBlocksOperation
+    }
+
+    case UNDO_REDO_OPERATIONS.UNGROUP_BLOCKS: {
+      const op = operation as UngroupBlocksOperation
+      return {
+        ...operation,
+        type: UNDO_REDO_OPERATIONS.GROUP_BLOCKS,
+        data: {
+          groupId: op.data.groupId,
+          blockIds: op.data.blockIds,
+        },
+      } as GroupBlocksOperation
+    }
+
     default: {
       const exhaustiveCheck: never = operation
       throw new Error(`Unhandled operation type: ${(exhaustiveCheck as Operation).type}`)

apps/sim/stores/workflow-diff/utils.ts

@@ -16,6 +16,7 @@ export function cloneWorkflowState(state: WorkflowState): WorkflowState {
     edges: structuredClone(state.edges || []),
     loops: structuredClone(state.loops || {}),
     parallels: structuredClone(state.parallels || {}),
+    groups: structuredClone(state.groups || {}),
   }
 }
 

apps/sim/stores/workflows/registry/store.ts

@@ -298,11 +298,26 @@ export const useWorkflowRegistry = create<WorkflowRegistry>()(
           let workflowState: any
 
           if (workflowData?.state) {
+            const blocks = workflowData.state.blocks || {}
+
+            // Reconstruct groups from blocks' groupId data
+            const reconstructedGroups: Record<string, { id: string; blockIds: string[] }> = {}
+            Object.entries(blocks).forEach(([blockId, block]: [string, any]) => {
+              const groupId = block?.data?.groupId
+              if (groupId) {
+                if (!reconstructedGroups[groupId]) {
+                  reconstructedGroups[groupId] = { id: groupId, blockIds: [] }
+                }
+                reconstructedGroups[groupId].blockIds.push(blockId)
+              }
+            })
+
             workflowState = {
-              blocks: workflowData.state.blocks || {},
+              blocks,
               edges: workflowData.state.edges || [],
               loops: workflowData.state.loops || {},
               parallels: workflowData.state.parallels || {},
+              groups: reconstructedGroups,
               lastSaved: Date.now(),
               deploymentStatuses: {},
             }
@@ -312,6 +327,7 @@ export const useWorkflowRegistry = create<WorkflowRegistry>()(
               edges: [],
               loops: {},
               parallels: {},
+              groups: {},
               deploymentStatuses: {},
               lastSaved: Date.now(),
             }

apps/sim/stores/workflows/workflow/store.ts

@@ -95,6 +95,7 @@ const initialState = {
   edges: [],
   loops: {},
   parallels: {},
+  groups: {},
   lastSaved: undefined,
   deploymentStatuses: {},
   needsRedeployment: false,
@@ -577,6 +578,7 @@ export const useWorkflowStore = create<WorkflowStore>()(
           edges: state.edges,
           loops: state.loops,
           parallels: state.parallels,
+          groups: state.groups,
           lastSaved: state.lastSaved,
           deploymentStatuses: state.deploymentStatuses,
           needsRedeployment: state.needsRedeployment,
@@ -597,6 +599,7 @@ export const useWorkflowStore = create<WorkflowStore>()(
             Object.keys(workflowState.parallels || {}).length > 0
               ? workflowState.parallels
               : generateParallelBlocks(nextBlocks)
+          const nextGroups = workflowState.groups || state.groups
 
           return {
             ...state,
@@ -604,6 +607,7 @@ export const useWorkflowStore = create<WorkflowStore>()(
             edges: nextEdges,
             loops: nextLoops,
             parallels: nextParallels,
+            groups: nextGroups,
             deploymentStatuses: workflowState.deploymentStatuses || state.deploymentStatuses,
             needsRedeployment:
               workflowState.needsRedeployment !== undefined
@@ -1333,6 +1337,126 @@ export const useWorkflowStore = create<WorkflowStore>()(
       getDragStartPosition: () => {
         return get().dragStartPosition || null
       },
+
+      groupBlocks: (blockIds: string[], groupId?: string) => {
+        if (blockIds.length === 0) return ''
+
+        const newGroupId = groupId || crypto.randomUUID()
+        const currentGroups = get().groups || {}
+        const currentBlocks = get().blocks
+
+        // Create the new group with all selected block IDs
+        const updatedGroups = { ...currentGroups }
+        updatedGroups[newGroupId] = {
+          id: newGroupId,
+          blockIds: [...blockIds],
+        }
+
+        // Update blocks: set groupId and push to groupStack
+        const newBlocks = { ...currentBlocks }
+        for (const blockId of blockIds) {
+          if (newBlocks[blockId]) {
+            const currentData = newBlocks[blockId].data || {}
+            const currentStack = Array.isArray(currentData.groupStack) ? currentData.groupStack : []
+            newBlocks[blockId] = {
+              ...newBlocks[blockId],
+              data: {
+                ...currentData,
+                groupId: newGroupId,
+                groupStack: [...currentStack, newGroupId],
+              },
+            }
+          }
+        }
+
+        set({
+          blocks: newBlocks,
+          groups: updatedGroups,
+        })
+
+        get().updateLastSaved()
+        logger.info('Created block group', {
+          groupId: newGroupId,
+          blockCount: blockIds.length,
+        })
+        return newGroupId
+      },
+
+      ungroupBlocks: (groupId: string) => {
+        const currentGroups = get().groups || {}
+        const currentBlocks = get().blocks
+        const group = currentGroups[groupId]
+
+        if (!group) {
+          logger.warn('Attempted to ungroup non-existent group', { groupId })
+          return []
+        }
+
+        const blockIds = [...group.blockIds]
+
+        // Remove the group from the groups record
+        const updatedGroups = { ...currentGroups }
+        delete updatedGroups[groupId]
+
+        // Update blocks: pop from groupStack and set groupId to the previous level
+        const newBlocks = { ...currentBlocks }
+        for (const blockId of blockIds) {
+          if (newBlocks[blockId]) {
+            const currentData = { ...newBlocks[blockId].data }
+            const currentStack = Array.isArray(currentData.groupStack)
+              ? [...currentData.groupStack]
+              : []
+
+            // Pop the current groupId from the stack
+            if (currentStack.length > 0 && currentStack[currentStack.length - 1] === groupId) {
+              currentStack.pop()
+            }
+
+            // The new groupId is the top of the remaining stack, or undefined if empty
+            const newGroupId =
+              currentStack.length > 0 ? currentStack[currentStack.length - 1] : undefined
+
+            if (newGroupId) {
+              currentData.groupId = newGroupId
+              currentData.groupStack = currentStack
+            } else {
+              // Remove groupId and groupStack if stack is empty
+              delete currentData.groupId
+              delete currentData.groupStack
+            }
+
+            newBlocks[blockId] = {
+              ...newBlocks[blockId],
+              data: currentData,
+            }
+          }
+        }
+
+        set({
+          blocks: newBlocks,
+          groups: updatedGroups,
+        })
+
+        get().updateLastSaved()
+        logger.info('Ungrouped blocks', {
+          groupId,
+          blockCount: blockIds.length,
+        })
+        return blockIds
+      },
+
+      getGroupBlockIds: (groupId: string) => {
+        const groups = get().groups || {}
+        const group = groups[groupId]
+
+        if (!group) return []
+
+        return [...group.blockIds]
+      },
+
+      getGroups: () => {
+        return get().groups || {}
+      },
     }),
     { name: 'workflow-store' }
   )

apps/sim/stores/workflows/workflow/types.ts

@@ -63,6 +63,11 @@ export interface BlockData {
 
   // Container node type (for ReactFlow node type determination)
   type?: string
+
+  // Block group membership
+  groupId?: string
+  /** Stack of group IDs for hierarchical grouping (oldest to newest) */
+  groupStack?: string[]
 }
 
 export interface BlockLayoutState {
@@ -144,6 +149,20 @@ export interface Variable {
   value: unknown
 }
 
+/**
+ * Represents a group of blocks on the canvas.
+ * Groups can be nested (a group can contain other groups via block membership).
+ * When a block is in a group, it stores the groupId in its data.
+ */
+export interface BlockGroup {
+  /** Unique identifier for the group */
+  id: string
+  /** Optional display name for the group */
+  name?: string
+  /** Block IDs that are direct members of this group */
+  blockIds: string[]
+}
+
 export interface DragStartPosition {
   id: string
   x: number
@@ -157,6 +176,8 @@ export interface WorkflowState {
   lastSaved?: number
   loops: Record<string, Loop>
   parallels: Record<string, Parallel>
+  /** Block groups for organizing blocks on the canvas */
+  groups?: Record<string, BlockGroup>
   lastUpdate?: number
   metadata?: {
     name?: string
@@ -243,6 +264,28 @@ export interface WorkflowActions {
     workflowState: WorkflowState,
     options?: { updateLastSaved?: boolean }
   ) => void
+
+  // Block group operations
+  /**
+   * Groups the specified blocks together.
+   * If any blocks are already in a group, they are removed from their current group first.
+   * @returns The new group ID
+   */
+  groupBlocks: (blockIds: string[], groupId?: string) => string
+  /**
+   * Ungroups a group, removing it and releasing its blocks.
+   * If the group has a parent group, blocks are moved to the parent group.
+   * @returns The block IDs that were in the group
+   */
+  ungroupBlocks: (groupId: string) => string[]
+  /**
+   * Gets all block IDs in a group, including blocks in nested groups (recursive).
+   */
+  getGroupBlockIds: (groupId: string, recursive?: boolean) => string[]
+  /**
+   * Gets all groups in the workflow.
+   */
+  getGroups: () => Record<string, BlockGroup>
 }
 
 export type WorkflowStore = WorkflowState & WorkflowActions