diff --git a/client/src/lib/api.ts b/client/src/lib/api.ts
index 3eec6cf..73c196c 100644
--- a/client/src/lib/api.ts
+++ b/client/src/lib/api.ts
@@ -27,6 +27,7 @@ async function request<T>(method: string, url: string, body?: unknown): Promise<
 export const api = {
   get: <T>(url: string) => request<T>('GET', url),
   post: <T>(url: string, body?: unknown) => request<T>('POST', url, body),
+  put: <T>(url: string, body?: unknown) => request<T>('PUT', url, body),
   patch: <T>(url: string, body?: unknown) => request<T>('PATCH', url, body),
   del: <T>(url: string) => request<T>('DELETE', url),
 }
diff --git a/client/src/pages/StructurePage.tsx b/client/src/pages/StructurePage.tsx
index e98bacd..d97b61a 100644
--- a/client/src/pages/StructurePage.tsx
+++ b/client/src/pages/StructurePage.tsx
@@ -1,7 +1,8 @@
 import { useCallback, useEffect, useState } from 'react'
-import { Boxes, Plus } from 'lucide-react'
+import { Boxes, FileText, Plus } from 'lucide-react'
 import { toast } from 'sonner'
 import { AppShell } from '@/components/AppShell'
+import { MarkdownEditor } from '@/components/MarkdownEditor'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -15,9 +16,26 @@ import {
   SelectTrigger,
   SelectValue,
 } from '@/components/ui/select'
+import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle } from '@/components/ui/sheet'
 import { api } from '@/lib/api'
 import { useAuth } from '@/store/auth'
 
+// A starter PRODUCT.md so an empty product gets useful structure to fill in.
+const IDENTITY_TEMPLATE = (name: string) =>
+  `---
+product: ${name}
+goals:
+domain:
+conventions:
+glossary:
+---
+
+# About ${name}
+
+Describe what this product is, who it serves, and the conventions every agent on it should follow.
+This identity is shared by every agent across the product's teams.
+`
+
 interface Division {
   id: string
   organizationId: string
@@ -52,6 +70,8 @@ export function StructurePage() {
   const [divisionName, setDivisionName] = useState('')
   const [product, setProduct] = useState({ name: '', kind: 'Product', divisionId: NONE })
   const [team, setTeam] = useState({ name: '', productId: NONE })
+  const [identity, setIdentity] = useState<{ productId: string; name: string; content: string } | null>(null)
+  const [savingIdentity, setSavingIdentity] = useState(false)
 
   const load = useCallback(async () => {
     if (!organizationId) return
@@ -115,6 +135,30 @@ export function StructurePage() {
       toast.success('Team created.')
     })
 
+  // Open the product's shared identity (PRODUCT.md) — load current text, or start from the template.
+  const openIdentity = async (p: Product) => {
+    try {
+      const current = await api.get<{ identity: string | null }>(`/api/orgboard/products/${p.id}/identity`)
+      setIdentity({ productId: p.id, name: p.name, content: current.identity ?? IDENTITY_TEMPLATE(p.name) })
+    } catch (err) {
+      toast.error((err as Error).message)
+    }
+  }
+
+  const saveIdentity = async () => {
+    if (!identity) return
+    setSavingIdentity(true)
+    try {
+      await api.put(`/api/orgboard/products/${identity.productId}/identity`, { identity: identity.content })
+      toast.success(`Identity saved for ${identity.name} — every agent on it now shares it.`)
+      setIdentity(null)
+    } catch (err) {
+      toast.error((err as Error).message)
+    } finally {
+      setSavingIdentity(false)
+    }
+  }
+
   return (
     <AppShell>
       <div className="mx-auto max-w-4xl p-6">
@@ -197,6 +241,9 @@ export function StructurePage() {
                     <span className="text-muted-foreground">
                       {p.divisionId ? divisions.find((d) => d.id === p.divisionId)?.name ?? '' : 'no division'}
                     </span>
+                    <Button variant="ghost" size="sm" className="ml-auto" onClick={() => openIdentity(p)}>
+                      <FileText data-icon="inline-start" /> Identity
+                    </Button>
                   </div>
                 ))}
                 {products.length === 0 && <p className="text-sm text-muted-foreground">No products yet.</p>}
@@ -246,6 +293,33 @@ export function StructurePage() {
           </Card>
         </div>
       </div>
+
+      {identity && (
+        <Sheet open onOpenChange={(o) => !o && setIdentity(null)}>
+          <SheetContent className="flex w-full flex-col gap-0 overflow-y-auto sm:max-w-2xl">
+            <SheetHeader>
+              <SheetTitle>Product identity — {identity.name}</SheetTitle>
+              <SheetDescription>
+                A shared PRODUCT.md (goals, domain, conventions) injected into every agent run on this
+                product, across all its teams. Treated as data, never as instructions.
+              </SheetDescription>
+            </SheetHeader>
+            <div className="flex flex-col gap-4 px-4 pb-6">
+              <MarkdownEditor
+                rows={22}
+                mono
+                frontmatter
+                value={identity.content}
+                onChange={(content) => setIdentity({ ...identity, content })}
+              />
+              <div className="flex items-center justify-end gap-2">
+                <Button variant="ghost" onClick={() => setIdentity(null)}>Cancel</Button>
+                <Button disabled={savingIdentity} onClick={saveIdentity}>Save identity</Button>
+              </div>
+            </div>
+          </SheetContent>
+        </Sheet>
+      )}
     </AppShell>
   )
 }