diff --git a/frontend/src/components/library/TreeGridView.tsx b/frontend/src/components/library/TreeGridView.tsx
index 2792c905..1973b6ee 100644
--- a/frontend/src/components/library/TreeGridView.tsx
+++ b/frontend/src/components/library/TreeGridView.tsx
@@ -1,5 +1,5 @@
 import { Link } from 'react-router-dom'
-import { Pencil, Globe, Lock, Trash2, GitBranch, FileText, Wrench, Star, Download } from 'lucide-react'
+import { Pencil, Globe, Lock, Trash2, GitBranch, FileText, Wrench, Star, Download, ClipboardList } from 'lucide-react'
 import type { TreeListItem } from '@/types'
 import { TagBadges } from '@/components/common/TagBadges'
 import { StaggerList } from '@/components/common/StaggerList'
@@ -10,6 +10,7 @@ import { getTreeEditorPath } from '@/lib/routing'
 interface TreeGridViewProps {
   trees: TreeListItem[]
   onStartSession: (treeId: string, treeType?: string) => void
+  onPrepareSession?: (tree: TreeListItem) => void
   onTagClick: (tag: string) => void
   onFolderCreated: (parentId?: string | null) => void
   onDeleteTree: (tree: TreeListItem) => void
@@ -23,6 +24,7 @@ interface TreeGridViewProps {
 export function TreeGridView({
   trees,
   onStartSession,
+  onPrepareSession,
   onTagClick,
   onDeleteTree,
   onForkTree,
@@ -169,6 +171,20 @@ export function TreeGridView({
                   <Trash2 className="h-4 w-4" />
                 </button>
               )}
+              {onPrepareSession && tree.tree_type !== 'troubleshooting' && (
+                <button
+                  type="button"
+                  onClick={() => onPrepareSession(tree)}
+                  className={cn(
+                    'rounded-md border border-border p-2 text-muted-foreground',
+                    'hover:bg-cyan-500/10 hover:text-cyan-400 hover:border-cyan-500/30'
+                  )}
+                  title="Prepare session for engineer"
+                  aria-label="Prepare session"
+                >
+                  <ClipboardList className="h-4 w-4" />
+                </button>
+              )}
               <button
                 type="button"
                 onClick={() => onStartSession(tree.id, tree.tree_type)}
diff --git a/frontend/src/components/library/TreeListView.tsx b/frontend/src/components/library/TreeListView.tsx
index 7ac6bcfe..43e02529 100644
--- a/frontend/src/components/library/TreeListView.tsx
+++ b/frontend/src/components/library/TreeListView.tsx
@@ -1,5 +1,5 @@
 import { Link } from 'react-router-dom'
-import { Pencil, Globe, Lock, GitBranch, FileText, Trash2, Wrench, Star, Download } from 'lucide-react'
+import { Pencil, Globe, Lock, GitBranch, FileText, Trash2, Wrench, Star, Download, ClipboardList } from 'lucide-react'
 import type { TreeListItem } from '@/types'
 import { TagBadges } from '@/components/common/TagBadges'
 import { cn } from '@/lib/utils'
@@ -9,6 +9,7 @@ import { getTreeEditorPath } from '@/lib/routing'
 interface TreeListViewProps {
   trees: TreeListItem[]
   onStartSession: (treeId: string, treeType?: string) => void
+  onPrepareSession?: (tree: TreeListItem) => void
   onTagClick: (tag: string) => void
   onFolderCreated: (parentId?: string | null) => void
   onDeleteTree: (tree: TreeListItem) => void
@@ -22,6 +23,7 @@ interface TreeListViewProps {
 export function TreeListView({
   trees,
   onStartSession,
+  onPrepareSession,
   onTagClick,
   onDeleteTree,
   onForkTree,
@@ -172,6 +174,20 @@ export function TreeListView({
                   </button>
                 </>
               )}
+              {onPrepareSession && tree.tree_type !== 'troubleshooting' && (
+                <button
+                  type="button"
+                  onClick={() => onPrepareSession(tree)}
+                  className={cn(
+                    'rounded-md border border-border p-1.5 text-muted-foreground',
+                    'hover:bg-cyan-500/10 hover:text-cyan-400 hover:border-cyan-500/30'
+                  )}
+                  title="Prepare session for engineer"
+                  aria-label="Prepare session"
+                >
+                  <ClipboardList className="h-4 w-4" />
+                </button>
+              )}
               <button
                 type="button"
                 onClick={() => onStartSession(tree.id, tree.tree_type)}
diff --git a/frontend/src/components/library/TreeTableView.tsx b/frontend/src/components/library/TreeTableView.tsx
index db95a1c9..c3cdaab2 100644
--- a/frontend/src/components/library/TreeTableView.tsx
+++ b/frontend/src/components/library/TreeTableView.tsx
@@ -1,6 +1,6 @@
 import { useState } from 'react'
 import { Link } from 'react-router-dom'
-import { Pencil, Globe, Lock, ChevronUp, ChevronDown, GitBranch, FileText, Trash2, Wrench, Star, Download } from 'lucide-react'
+import { Pencil, Globe, Lock, ChevronUp, ChevronDown, GitBranch, FileText, Trash2, Wrench, Star, Download, ClipboardList } from 'lucide-react'
 import type { TreeListItem } from '@/types'
 import { TagBadges } from '@/components/common/TagBadges'
 import { cn } from '@/lib/utils'
@@ -10,6 +10,7 @@ import { getTreeEditorPath } from '@/lib/routing'
 interface TreeTableViewProps {
   trees: TreeListItem[]
   onStartSession: (treeId: string, treeType?: string) => void
+  onPrepareSession?: (tree: TreeListItem) => void
   onTagClick: (tag: string) => void
   onFolderCreated: (parentId?: string | null) => void
   onDeleteTree: (tree: TreeListItem) => void
@@ -26,6 +27,7 @@ type SortColumn = 'name' | 'category' | 'version' | 'usage' | 'updated'
 export function TreeTableView({
   trees,
   onStartSession,
+  onPrepareSession,
   onTagClick,
   onDeleteTree,
   onSortChange,
@@ -283,6 +285,20 @@ export function TreeTableView({
                       </button>
                     </>
                   )}
+                  {onPrepareSession && tree.tree_type !== 'troubleshooting' && (
+                    <button
+                      type="button"
+                      onClick={() => onPrepareSession(tree)}
+                      className={cn(
+                        'rounded-md border border-border p-1.5 text-muted-foreground',
+                        'hover:bg-cyan-500/10 hover:text-cyan-400 hover:border-cyan-500/30'
+                      )}
+                      title="Prepare session for engineer"
+                      aria-label="Prepare session"
+                    >
+                      <ClipboardList className="h-3.5 w-3.5" />
+                    </button>
+                  )}
                   <button
                     type="button"
                     onClick={() => onStartSession(tree.id, tree.tree_type)}
diff --git a/frontend/src/pages/TreeLibraryPage.tsx b/frontend/src/pages/TreeLibraryPage.tsx
index 21ea0e26..102f5a0d 100644
--- a/frontend/src/pages/TreeLibraryPage.tsx
+++ b/frontend/src/pages/TreeLibraryPage.tsx
@@ -7,11 +7,13 @@ import { treesApi } from '@/api/trees'
 import { categoriesApi } from '@/api/categories'
 import { foldersApi } from '@/api/folders'
 import { sessionsApi } from '@/api/sessions'
-import type { TreeListItem, CategoryListItem, FolderListItem, Session } from '@/types'
+import type { TreeListItem, CategoryListItem, FolderListItem, Session, IntakeFormField } from '@/types'
 import { FolderEditModal } from '@/components/library/FolderEditModal'
 import { ForkModal } from '@/components/library/ForkModal'
 import { ExportFlowModal } from '@/components/library/ExportFlowModal'
 import { ImportFlowModal } from '@/components/library/ImportFlowModal'
+import { PrepareSessionModal } from '@/components/procedural/PrepareSessionModal'
+import { accountsApi } from '@/api/accounts'
 import { ConfirmDialog } from '@/components/common/ConfirmDialog'
 import { TreeGridView } from '@/components/library/TreeGridView'
 import { TreeListView } from '@/components/library/TreeListView'
@@ -83,6 +85,13 @@ export function TreeLibraryPage() {
   const [showImportModal, setShowImportModal] = useState(false)
   const [exportTarget, setExportTarget] = useState<TreeListItem | null>(null)
 
+  // Prepare session modal state
+  const [prepareTarget, setPrepareTarget] = useState<{
+    tree: TreeListItem
+    intakeFields: IntakeFormField[]
+    teamMembers: { id: string; name: string; email: string }[]
+  } | null>(null)
+
   // AI builder state
 
   const { aiEnabled } = useCachedQuota()
@@ -268,6 +277,24 @@ export function TreeLibraryPage() {
     if (tree) setExportTarget(tree)
   }
 
+  const handlePrepareSession = async (tree: TreeListItem) => {
+    try {
+      const [treeDetail, members] = await Promise.all([
+        treesApi.get(tree.id),
+        accountsApi.getMembers().catch(() => []),
+      ])
+      setPrepareTarget({
+        tree,
+        intakeFields: treeDetail.intake_form || [],
+        teamMembers: members
+          .filter(m => m.is_active)
+          .map(m => ({ id: m.id, name: m.name, email: m.email })),
+      })
+    } catch {
+      toast.error('Failed to load flow details')
+    }
+  }
+
   const hasActiveFilters =
     selectedCategoryId || selectedTags.length > 0 || searchQuery || selectedFolderId
 
@@ -498,6 +525,7 @@ export function TreeLibraryPage() {
                 <TreeGridView
                   trees={trees}
                   onStartSession={handleStartSession}
+                  onPrepareSession={handlePrepareSession}
                   onTagClick={handleTagClick}
                   onFolderCreated={handleCreateFolder}
                   onDeleteTree={(tree) => {
@@ -515,6 +543,7 @@ export function TreeLibraryPage() {
                 <TreeListView
                   trees={trees}
                   onStartSession={handleStartSession}
+                  onPrepareSession={handlePrepareSession}
                   onTagClick={handleTagClick}
                   onFolderCreated={handleCreateFolder}
                   onDeleteTree={(tree) => {
@@ -532,6 +561,7 @@ export function TreeLibraryPage() {
                 <TreeTableView
                   trees={trees}
                   onStartSession={handleStartSession}
+                  onPrepareSession={handlePrepareSession}
                   onTagClick={handleTagClick}
                   onFolderCreated={handleCreateFolder}
                   onDeleteTree={(tree) => {
@@ -604,6 +634,18 @@ export function TreeLibraryPage() {
           onClose={() => { setShowImportModal(false); loadTrees() }}
         />
       )}
+
+      {prepareTarget && (
+        <PrepareSessionModal
+          isOpen
+          onClose={() => setPrepareTarget(null)}
+          treeId={prepareTarget.tree.id}
+          treeName={prepareTarget.tree.name}
+          intakeFields={prepareTarget.intakeFields}
+          teamMembers={prepareTarget.teamMembers}
+          onPrepared={() => setPrepareTarget(null)}
+        />
+      )}
     </div>
     </div>
   )