diff --git a/src/renderer/src/runtime/local-structured-session-tabs-sync.test.ts b/src/renderer/src/runtime/local-structured-session-tabs-sync.test.ts
new file mode 100644
index 00000000000..b9a55546c6e
--- /dev/null
+++ b/src/renderer/src/runtime/local-structured-session-tabs-sync.test.ts
@@ -0,0 +1,61 @@
+import { describe, expect, it } from 'vitest'
+import type { RuntimeMobileSessionTabsResult } from '../../../shared/runtime-types'
+import { projectLocalStructuredSessionTabs } from './local-structured-session-tabs-sync'
+
+describe('local structured session tab projection', () => {
+  it('drops terminal topology while retaining structured tabs', () => {
+    const snapshot = {
+      worktree: 'workspace-1',
+      publicationEpoch: 'epoch-1',
+      snapshotVersion: 1,
+      activeGroupId: 'structured-group',
+      activeTabId: 'agent-session:codex-1',
+      activeTabType: 'agent-session',
+      tabGroups: [
+        {
+          id: 'terminal-group',
+          activeTabId: 'terminal-1',
+          tabOrder: ['terminal-1']
+        },
+        {
+          id: 'structured-group',
+          activeTabId: 'agent-session:codex-1',
+          tabOrder: ['agent-session:codex-1']
+        }
+      ],
+      tabGroupLayout: {
+        type: 'split',
+        direction: 'horizontal',
+        first: { type: 'leaf', groupId: 'terminal-group' },
+        second: { type: 'leaf', groupId: 'structured-group' }
+      },
+      tabs: [
+        {
+          type: 'terminal',
+          id: 'terminal-1',
+          parentTabId: 'terminal-1',
+          leafId: 'leaf-1',
+          title: 'Terminal',
+          status: 'ready',
+          terminal: 'term-1',
+          ptyId: 'pty-1',
+          isActive: false
+        },
+        {
+          type: 'agent-session',
+          id: 'agent-session:codex-1',
+          title: 'Codex Chat',
+          sessionId: 'codex-1',
+          agent: 'codex',
+          isActive: true
+        }
+      ]
+    } satisfies RuntimeMobileSessionTabsResult
+
+    expect(projectLocalStructuredSessionTabs(snapshot)).toMatchObject({
+      tabGroups: undefined,
+      tabGroupLayout: undefined,
+      tabs: [expect.objectContaining({ type: 'agent-session', agent: 'codex' })]
+    })
+  })
+})
diff --git a/src/renderer/src/runtime/local-structured-session-tabs-sync.ts b/src/renderer/src/runtime/local-structured-session-tabs-sync.ts
index 43701c512a7..458abfed1b2 100644
--- a/src/renderer/src/runtime/local-structured-session-tabs-sync.ts
+++ b/src/renderer/src/runtime/local-structured-session-tabs-sync.ts
@@ -11,20 +11,18 @@ type SessionTabsEvent =
   | { type: 'snapshots'; snapshots: RuntimeMobileSessionTabsResult[] }
   | { type: 'end' }
 
-function structuredOnly(snapshot: RuntimeMobileSessionTabsResult): RuntimeMobileSessionTabsResult {
+export function projectLocalStructuredSessionTabs(
+  snapshot: RuntimeMobileSessionTabsResult
+): RuntimeMobileSessionTabsResult {
   const structuredIds = new Set(
     snapshot.tabs.filter((tab) => tab.type === 'agent-session').map((tab) => tab.id)
   )
   return {
     ...snapshot,
     tabs: snapshot.tabs.filter((tab) => structuredIds.has(tab.id)),
-    tabGroups: snapshot.tabGroups?.map((group) => ({
-      ...group,
-      tabOrder: group.tabOrder.filter((id) => structuredIds.has(id)),
-      activeTabId:
-        group.activeTabId && structuredIds.has(group.activeTabId) ? group.activeTabId : null,
-      recentTabIds: group.recentTabIds?.filter((id) => structuredIds.has(id))
-    }))
+    // Why: replaying local terminal topology under the structured owner clones the workspace layout.
+    tabGroups: undefined,
+    tabGroupLayout: undefined
   }
 }
 
@@ -34,7 +32,7 @@ function applySnapshots(snapshots: readonly RuntimeMobileSessionTabsResult[]): v
     for (const snapshot of snapshots) {
       const patch = applyWebSessionTabsSnapshot(
         next,
-        structuredOnly(snapshot),
+        projectLocalStructuredSessionTabs(snapshot),
         LOCAL_STRUCTURED_SESSION_OWNER
       )
       next = patch === next ? next : ({ ...next, ...patch } as typeof state)