diff --git a/src/main/browser/browser-session-registry.test.ts b/src/main/browser/browser-session-registry.test.ts
index 2dcdac48319..fb715f151c7 100644
--- a/src/main/browser/browser-session-registry.test.ts
+++ b/src/main/browser/browser-session-registry.test.ts
@@ -376,6 +376,34 @@ describe('BrowserSessionRegistry', () => {
     expect(recreated?.partition).not.toBe(first.partition)
   })
 
+  it('announces each profile change after the list reflects it', async () => {
+    const seen: string[][] = []
+    browserSessionRegistry.onProfilesChanged = () =>
+      seen.push(browserSessionRegistry.listProfiles().map((profile) => profile.label))
+    try {
+      const made = await browserSessionRegistry.createProfile('isolated', 'Made by CLI')
+      const managed = await ensureManagedBrowserProfile({ kind: 'repo', id: 'announce' }, 'Repo')
+      if (!made || !managed) {
+        throw new Error('Expected created profiles')
+      }
+      browserSessionRegistry.updateProfileSource(made.id, {
+        browserFamily: 'manual',
+        importedAt: 1
+      })
+      await browserSessionRegistry.deleteProfile(made.id)
+      await browserSessionRegistry.deleteProfile('default')
+      await browserSessionRegistry.createProfile('default', 'Refused')
+
+      expect(seen).toHaveLength(4)
+      expect(seen[0]).toContain('Made by CLI')
+      expect(seen[1]).toContain('Repo')
+      expect(seen[2]).toContain('Made by CLI')
+      expect(seen[3]).not.toContain('Made by CLI')
+    } finally {
+      browserSessionRegistry.onProfilesChanged = null
+    }
+  })
+
   it('refuses to delete the default profile', async () => {
     const deleted = await browserSessionRegistry.deleteProfile('default')
     expect(deleted).toBe(false)
diff --git a/src/main/browser/browser-session-registry.ts b/src/main/browser/browser-session-registry.ts
index 9d43c59abf3..1e2f20a727f 100644
--- a/src/main/browser/browser-session-registry.ts
+++ b/src/main/browser/browser-session-registry.ts
@@ -56,6 +56,8 @@ class BrowserSessionRegistry {
   private activeOrcaProfileId = DEFAULT_LOCAL_ORCA_PROFILE_ID
   private metadataPathOverride: string | null = null
   private defaultPartition = ORCA_BROWSER_PARTITION
+  // Why: profiles change from IPC, the CLI and managed-profile owners; open windows and paired clients only learn of it here.
+  onProfilesChanged: (() => void) | null = null
 
   constructor() {
     this.resetDefaultProfile()
@@ -234,6 +236,7 @@ class BrowserSessionRegistry {
     }
     this.profiles.set(id, profile)
     this.persistProfiles()
+    this.onProfilesChanged?.()
     return profile
   }
 
@@ -252,6 +255,7 @@ class BrowserSessionRegistry {
     } else {
       this.persistProfiles()
     }
+    this.onProfilesChanged?.()
     return updated
   }
 
@@ -262,6 +266,7 @@ class BrowserSessionRegistry {
     }
     this.profiles.delete(profileId)
     this.persistProfiles()
+    this.onProfilesChanged?.()
     forgetBrowserSitePermissions(profileId)
     forgetBrowserSiteDisplay(profileId)
     const meta = this.loadPersistedMeta()
@@ -309,6 +314,7 @@ class BrowserSessionRegistry {
         pendingCookieDbPath: null,
         pendingCookieImports
       })
+      this.onProfilesChanged?.()
 
       const sess = session.fromPartition(this.defaultPartition)
       await sess.clearStorageData({ storages: ['cookies'] })
diff --git a/src/main/runtime/runtime-notifier-contract.ts b/src/main/runtime/runtime-notifier-contract.ts
index 6aba19f72ea..958d4ae40de 100644
--- a/src/main/runtime/runtime-notifier-contract.ts
+++ b/src/main/runtime/runtime-notifier-contract.ts
@@ -45,6 +45,7 @@ export type RuntimeNotifier = {
   worktreeBaseStatus?(event: WorktreeBaseStatusEvent): void
   worktreeRemoteBranchConflict?(event: WorktreeRemoteBranchConflictEvent): void
   reposChanged(): void
+  browserProfilesChanged?(): void
   activateWorktree(
     repoId: string,
     worktreeId: string,
diff --git a/src/main/runtime/workspaces/workspace-host-notifications.ts b/src/main/runtime/workspaces/workspace-host-notifications.ts
index 563179c0394..d5e14172372 100644
--- a/src/main/runtime/workspaces/workspace-host-notifications.ts
+++ b/src/main/runtime/workspaces/workspace-host-notifications.ts
@@ -189,6 +189,12 @@ export abstract class OrcaRuntimeWithNotifySshStateChanged extends OrcaRuntimeWi
     this.emitClientEvent({ type: 'reposChanged' })
   }
 
+  // Why: browser profiles change in main's session registry, outside runtime methods.
+  notifyBrowserProfilesChanged(): void {
+    this.notifier?.browserProfilesChanged?.()
+    this.emitClientEvent({ type: 'browserProfilesChanged' })
+  }
+
   /** `setup` and `defaultTabs` go to the host window only: main tried and failed to start them. */
   protected notifyActivateWorktree(
     repoId: string,
diff --git a/src/main/startup/main-process-quit-pending-writer.test.ts b/src/main/startup/main-process-quit-pending-writer.test.ts
index 35fa8f9396e..eff3d7b3f83 100644
--- a/src/main/startup/main-process-quit-pending-writer.test.ts
+++ b/src/main/startup/main-process-quit-pending-writer.test.ts
@@ -36,6 +36,7 @@ const dependencies: Record<string, Record<string, unknown>> = {
   '../ipc/desktop-browser-bridge-wiring': { disposeDesktopBrowserBridge: idle() },
   '../orca-profiles/profile-cloud-session-owner': { flushUnsavedCloudSessions: idle() },
   '../browser/browser-manager': { browserManager: { setBrowserGuestStateChangedListener: idle() } },
+  '../browser/browser-session-registry': { browserSessionRegistry: {} },
   '../browser/local-ssh-browser-route': { closeAllLocalSshBrowserRoutes: settled() },
   '../codex/codex-state-db-backfill-recovery': { stopCodexStateDbBackfillRecoveries: settled() },
   '../codex/codex-account-session-bridge': { stopCodexAccountSessionBridges: idle() },
diff --git a/src/main/startup/main-process-quit-update-veto.test.ts b/src/main/startup/main-process-quit-update-veto.test.ts
index 5bdba8f1e82..897f92c4245 100644
--- a/src/main/startup/main-process-quit-update-veto.test.ts
+++ b/src/main/startup/main-process-quit-update-veto.test.ts
@@ -25,6 +25,7 @@ const dependencyExports: [string, string[]][] = [
   ['../ipc/desktop-browser-bridge-wiring', ['disposeDesktopBrowserBridge']],
   ['../orca-profiles/profile-cloud-session-owner', ['flushUnsavedCloudSessions']],
   ['../browser/browser-manager', ['browserManager']],
+  ['../browser/browser-session-registry', ['browserSessionRegistry']],
   ['../codex/codex-state-db-backfill-recovery', ['stopCodexStateDbBackfillRecoveries']],
   ['../codex/codex-account-session-bridge', ['stopCodexAccountSessionBridges']],
   ['../git/local-repo-ref-maintenance', ['awaitPackedRefsLockRelease']],
diff --git a/src/main/startup/main-process-runtime-service.ts b/src/main/startup/main-process-runtime-service.ts
index 3680effce80..41382433fb1 100644
--- a/src/main/startup/main-process-runtime-service.ts
+++ b/src/main/startup/main-process-runtime-service.ts
@@ -12,6 +12,7 @@ import { clearProviderPtyState } from '../ipc/pty/provider/state-cleanup'
 import { agentHookServer } from '../agent-hooks/server'
 import { toAgentStatusIpcPayload } from '../agent-hooks/server/server-status-identity'
 import { browserManager } from '../browser/browser-manager'
+import { browserSessionRegistry } from '../browser/browser-session-registry'
 import { loadAgentSessionClaimSigner } from '../runtime/agent-session-claim-identity'
 import { getProfileUserDataPath } from '../orca-profiles/profile-storage-paths'
 import { codexAiVaultSessionResumePreparation } from '../codex/codex-ai-vault-session-resume'
@@ -173,6 +174,7 @@ export function initializeMainProcessRuntime(): OrcaRuntimeService {
   browserManager.setBrowserGuestStateChangedListener((worktreeId) => {
     runtime.notifyMobileSessionTabsChanged(worktreeId)
   })
+  browserSessionRegistry.onProfilesChanged = () => runtime.notifyBrowserProfilesChanged()
   return runtime
 }
 
diff --git a/src/main/window/runtime-window-lifecycle.ts b/src/main/window/runtime-window-lifecycle.ts
index 459c133fd07..ebec79fed02 100644
--- a/src/main/window/runtime-window-lifecycle.ts
+++ b/src/main/window/runtime-window-lifecycle.ts
@@ -44,6 +44,7 @@ export function registerRuntimeWindowLifecycle(
     worktreeBaseStatus: (event) => send('worktree:baseStatus', event),
     worktreeRemoteBranchConflict: (event) => send('worktree:remoteBranchConflict', event),
     reposChanged: () => send('repos:changed'),
+    browserProfilesChanged: () => send('browser:session:profilesChanged'),
     automationsChanged: (payload) => send('automations:changed', payload),
     activateWorktree: (
       repoId,
diff --git a/src/preload/api/browser-api.ts b/src/preload/api/browser-api.ts
index d6ff0afcb31..a7067f5c001 100644
--- a/src/preload/api/browser-api.ts
+++ b/src/preload/api/browser-api.ts
@@ -186,6 +186,7 @@ export type BrowserApi = {
     callback: (args: { browserPageId: string; key: 'c' | 's' }) => void
   ) => () => void
   sessionListProfiles: () => Promise<BrowserSessionProfile[]>
+  onSessionProfilesChanged: (callback: () => void) => () => void
   /** Resolves once the SSH workspace's partition is bound and proxy-verified; the webview must wait for it. */
   prepareSshWorkspacePartition: (args: {
     targetId: string
diff --git a/src/preload/api/browser-bridge-page-interaction-and-sessions.ts b/src/preload/api/browser-bridge-page-interaction-and-sessions.ts
index d666aa7c079..efba98ae261 100644
--- a/src/preload/api/browser-bridge-page-interaction-and-sessions.ts
+++ b/src/preload/api/browser-bridge-page-interaction-and-sessions.ts
@@ -123,6 +123,11 @@ export const browserPageInteractionAndSessionsApi = {
     return () => ipcRenderer.removeListener('browser:grabActionShortcut', listener)
   },
   sessionListProfiles: () => ipcRenderer.invoke('browser:session:listProfiles'),
+  onSessionProfilesChanged: (callback: () => void): (() => void) => {
+    const listener = (): void => callback()
+    ipcRenderer.on('browser:session:profilesChanged', listener)
+    return () => ipcRenderer.removeListener('browser:session:profilesChanged', listener)
+  },
   prepareSshWorkspacePartition: (args: {
     targetId: string
     expectedSshTargetGeneration?: number
diff --git a/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.test.ts b/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.test.ts
new file mode 100644
index 00000000000..3856d02f394
--- /dev/null
+++ b/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.test.ts
@@ -0,0 +1,35 @@
+// @vitest-environment happy-dom
+import { act, cleanup, renderHook } from '@testing-library/react'
+import { afterEach, expect, it } from 'vitest'
+import { useAppStore } from '@/store'
+import type { BrowserSessionProfile } from '../../../../../shared/browser-workspace-types'
+import { useBrowserPageWebviewPartition } from './use-browser-page-webview-partition'
+
+const initialState = useAppStore.getState()
+afterEach(() => {
+  cleanup()
+  useAppStore.setState(initialState, true)
+})
+
+const profile = (id: string, scope: BrowserSessionProfile['scope']): BrowserSessionProfile => ({
+  id,
+  scope,
+  partition: `persist:${id}`,
+  label: id,
+  source: null
+})
+
+it('keeps a tab out of the Default jar once its profile is deleted elsewhere', () => {
+  const defaultProfile = profile('default', 'default')
+  useAppStore.setState({
+    browserSessionProfilesByHostId: { local: [defaultProfile, profile('work', 'isolated')] }
+  })
+  const { result } = renderHook(() =>
+    useBrowserPageWebviewPartition({ sessionProfileId: 'work', sessionPartition: null })
+  )
+  expect(result.current).toBe('persist:work')
+
+  act(() => useAppStore.setState({ browserSessionProfilesByHostId: { local: [defaultProfile] } }))
+
+  expect(result.current).not.toBe(defaultProfile.partition)
+})
diff --git a/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.ts b/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.ts
index e20c34d2658..722a89b1ffa 100644
--- a/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.ts
+++ b/src/renderer/src/components/browser-pane/host-guest/use-browser-page-webview-partition.ts
@@ -2,6 +2,7 @@ import { useAppStore } from '@/store'
 import { ORCA_BROWSER_PARTITION } from '../../../../../shared/constants'
 import { getOrcaProfileBrowserDefaultPartition } from '../../../../../shared/orca-profiles'
 import { LOCAL_EXECUTION_HOST_ID } from '../../../../../shared/execution-host'
+import { unadmittedBrowserPartition } from '../../../../../shared/browser-profile-scope'
 
 export function useBrowserPageWebviewPartition({
   sessionProfileId,
@@ -11,9 +12,11 @@ export function useBrowserPageWebviewPartition({
   sessionPartition: string | null
 }): string {
   // Why the local list first: this webview renders here, while Settings may be showing a paired host's profiles.
-  const browserSessionProfiles = useAppStore(
-    (s) => s.browserSessionProfilesByHostId[LOCAL_EXECUTION_HOST_ID] ?? s.browserSessionProfiles
+  const localProfiles = useAppStore(
+    (s) => s.browserSessionProfilesByHostId[LOCAL_EXECUTION_HOST_ID]
   )
+  const mirroredProfiles = useAppStore((s) => s.browserSessionProfiles)
+  const browserSessionProfiles = localProfiles ?? mirroredProfiles
   const activeOrcaProfileId = useAppStore((s) => s.activeOrcaProfileId)
   const fallbackBrowserPartition = activeOrcaProfileId
     ? getOrcaProfileBrowserDefaultPartition(activeOrcaProfileId)
@@ -22,8 +25,14 @@ export function useBrowserPageWebviewPartition({
   const sessionProfile = sessionProfileId
     ? (browserSessionProfiles.find((p) => p.id === sessionProfileId) ?? null)
     : defaultSessionProfile
+  if (sessionPartition) {
+    return sessionPartition
+  }
+  // Why: a profile missing from main's loaded list was deleted; its tab must load nowhere, not in Default's jar.
+  if (sessionProfileId && !sessionProfile && localProfiles) {
+    return unadmittedBrowserPartition(sessionProfileId)
+  }
   return (
-    sessionPartition ??
     sessionProfile?.partition ??
     defaultSessionProfile?.partition ??
     fallbackBrowserPartition ??
diff --git a/src/renderer/src/hooks/ipc-events-agent-status-window-test-fixtures.ts b/src/renderer/src/hooks/ipc-events-agent-status-window-test-fixtures.ts
index 73b439c4d86..ecedfe0759f 100644
--- a/src/renderer/src/hooks/ipc-events-agent-status-window-test-fixtures.ts
+++ b/src/renderer/src/hooks/ipc-events-agent-status-window-test-fixtures.ts
@@ -102,6 +102,7 @@ export function buildWindowApi(args: {
         onGuestLoadFailed: () => () => {},
         onPaneFocus: () => () => {},
         onOpenLinkInOrcaTab: () => () => {},
+        onSessionProfilesChanged: () => () => {},
         onNavigationUpdate: () => () => {},
         onActivateView: () => () => {}
       },
diff --git a/src/renderer/src/hooks/ipc-events-close-routing-test-harness.ts b/src/renderer/src/hooks/ipc-events-close-routing-test-harness.ts
index 0d4864a5bae..13fb929835d 100644
--- a/src/renderer/src/hooks/ipc-events-close-routing-test-harness.ts
+++ b/src/renderer/src/hooks/ipc-events-close-routing-test-harness.ts
@@ -261,9 +261,7 @@ export async function useIpcEventsForCloseRouting({
         getZoomLevel: () => 0,
         set: vi.fn()
       },
-      settings: {
-        onChanged: () => () => {}
-      },
+      settings: { onChanged: () => () => {} },
       updater: {
         getStatus: () => Promise.resolve({ state: 'idle' }),
         onStatus: () => () => {},
@@ -272,6 +270,7 @@ export async function useIpcEventsForCloseRouting({
       browser: {
         onGuestLoadFailed: () => () => {},
         onOpenLinkInOrcaTab: () => () => {},
+        onSessionProfilesChanged: () => () => {},
         onNavigationUpdate: () => () => {},
         onActivateView: () => () => {},
         onPaneFocus: () => () => {}
diff --git a/src/renderer/src/hooks/ipc-events-terminal-create-window-test-fixtures.ts b/src/renderer/src/hooks/ipc-events-terminal-create-window-test-fixtures.ts
index b6ca3aa46e0..2a86115162f 100644
--- a/src/renderer/src/hooks/ipc-events-terminal-create-window-test-fixtures.ts
+++ b/src/renderer/src/hooks/ipc-events-terminal-create-window-test-fixtures.ts
@@ -163,6 +163,7 @@ export function buildTerminalCreateWindow(args: {
       browser: {
         onGuestLoadFailed: () => () => {},
         onOpenLinkInOrcaTab: () => () => {},
+        onSessionProfilesChanged: () => () => {},
         onNavigationUpdate: () => () => {},
         onActivateView: () => () => {},
         onPaneFocus: () => () => {}
diff --git a/src/renderer/src/hooks/ipc-events/browser-state-capture-paint-hold.test.ts b/src/renderer/src/hooks/ipc-events/browser-state-capture-paint-hold.test.ts
index 93edfbf7a3d..9dd99d33959 100644
--- a/src/renderer/src/hooks/ipc-events/browser-state-capture-paint-hold.test.ts
+++ b/src/renderer/src/hooks/ipc-events/browser-state-capture-paint-hold.test.ts
@@ -30,6 +30,7 @@ function captureHoldHandler(unsubs: (() => void)[] = []): (event: CapturePaintHo
         onActivateView: subscribe,
         onPaneFocus: subscribe,
         onOpenLinkInOrcaTab: subscribe,
+        onSessionProfilesChanged: subscribe,
         onCapturePaintHold: (callback: (event: CapturePaintHoldEvent) => void) => {
           handler = callback
           return () => {}
diff --git a/src/renderer/src/hooks/ipc-events/browser-state-ipc-bridge.ts b/src/renderer/src/hooks/ipc-events/browser-state-ipc-bridge.ts
index 955c01db304..dc792c258d8 100644
--- a/src/renderer/src/hooks/ipc-events/browser-state-ipc-bridge.ts
+++ b/src/renderer/src/hooks/ipc-events/browser-state-ipc-bridge.ts
@@ -2,6 +2,7 @@ import { rememberLiveBrowserUrl } from '@/components/browser-pane/describe-page/
 import { runtimeEnvironmentIdOrLocalUnlessTwin } from '@/lib/worktree-runtime-owner'
 import { openUrlInTabBesideBrowserPage } from '@/lib/browser-page-tab-opening'
 import { redactKagiSessionToken } from '../../../../shared/browser-url'
+import { LOCAL_EXECUTION_HOST_ID } from '../../../../shared/execution-host'
 import { useAppStore } from '../../store'
 import {
   acquireBrowserAutomationVisibility,
@@ -153,4 +154,9 @@ export function registerBrowserStateIpcBridge(
       }
     })
   )
+  unsubs.push(
+    window.api.browser.onSessionProfilesChanged(() => {
+      void useAppStore.getState().fetchBrowserSessionProfiles(LOCAL_EXECUTION_HOST_ID)
+    })
+  )
 }
diff --git a/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge-ownership.test.ts b/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge-ownership.test.ts
index e48d86d244e..ada9964824c 100644
--- a/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge-ownership.test.ts
+++ b/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge-ownership.test.ts
@@ -54,6 +54,7 @@ function createHarness() {
           subscribeRuntimeEnvironmentFromPreload(ipc, args, callbacks, () => `sub-${nextId++}`),
         call: vi.fn(async () => ({ id: 'r', ok: true, result: [] }))
       },
+      browser: { sessionClientRouteImportSources: async () => ({}) },
       linear: { getIssue }
     }
   })
@@ -439,3 +440,38 @@ it('accepts a fresh bridge early frame while rejecting the previous bridge frame
   }
   expect(h.ipc.removeListener).toHaveBeenCalledOnce()
 })
+
+it("lists a profile created on the host once the host announces it, without touching other hosts' lists", async () => {
+  const h = createHarness()
+  const madeByCli = {
+    id: 'made-by-cli',
+    scope: 'isolated' as const,
+    partition: 'persist:orca-browser-session-made-by-cli',
+    label: 'Made by CLI',
+    source: null
+  }
+  const status = createCompatibleRuntimeStatusResponse()
+  vi.mocked(window.api.runtimeEnvironments.call).mockImplementation(async ({ method }) =>
+    method === 'status.get'
+      ? status
+      : {
+          id: 'r',
+          ok: true,
+          result: { profiles: [madeByCli] },
+          _meta: { runtimeId: 'remote-runtime' }
+        }
+  )
+  useAppStore.setState({ browserSessionProfilesByHostId: { local: [] } })
+  try {
+    h.start()
+    h.emit(0, false, { type: 'browserProfilesChanged' })
+    await vi.waitFor(() =>
+      expect(useAppStore.getState().browserSessionProfilesByHostId['runtime:host-a']).toEqual([
+        madeByCli
+      ])
+    )
+    expect(useAppStore.getState().browserSessionProfilesByHostId.local).toEqual([])
+  } finally {
+    await h.finish()
+  }
+})
diff --git a/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge.ts b/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge.ts
index 1908c357381..e59741d32ba 100644
--- a/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge.ts
+++ b/src/renderer/src/hooks/ipc-events/runtime-client-ipc-bridge.ts
@@ -13,7 +13,7 @@ import { subscribeRuntimeClientEvents } from '@/runtime/runtime-client-events'
 import { toRemoteRuntimePtyId } from '../../../../shared/remote-runtime-pty-id'
 import { getEnvironmentSshStateGeneration } from '@/store/slices/runtime-environment-ssh'
 import { getRuntimeEnvironmentConnectionGeneration } from '@/store/slices/runtime-status'
-import { getRepoExecutionHostId } from '../../../../shared/execution-host'
+import { getRepoExecutionHostId, toRuntimeExecutionHostId } from '../../../../shared/execution-host'
 import type { RuntimeClientEvent } from '../../../../shared/runtime-client-events'
 import { navigationTargetsClients } from '../../../../shared/runtime-navigation'
 import { useAppStore } from '../../store'
@@ -126,6 +126,12 @@ export function registerRuntimeClientIpcBridge(
       })
       return
     }
+    if (event.type === 'browserProfilesChanged') {
+      void useAppStore
+        .getState()
+        .fetchBrowserSessionProfiles(toRuntimeExecutionHostId(environmentId))
+      return
+    }
     if (event.type === 'sshStateChanged') {
       applyRuntimeEnvironmentSshStateChanged(environmentId, event.targetId, event.state, generation)
       return
diff --git a/src/renderer/src/hooks/useIpcEvents-browser-tab-create.test.ts b/src/renderer/src/hooks/useIpcEvents-browser-tab-create.test.ts
index 65ed69ee9d1..21cfb9b1374 100644
--- a/src/renderer/src/hooks/useIpcEvents-browser-tab-create.test.ts
+++ b/src/renderer/src/hooks/useIpcEvents-browser-tab-create.test.ts
@@ -219,6 +219,7 @@ describe('useIpcEvents browser tab create routing', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: (listener: NonNullable<typeof activateViewListenerRef.current>) => {
             activateViewListenerRef.current = listener
diff --git a/src/renderer/src/hooks/useIpcEvents-cli-worktree-activation.test.ts b/src/renderer/src/hooks/useIpcEvents-cli-worktree-activation.test.ts
index 6994f9d2176..f5c117b6c4a 100644
--- a/src/renderer/src/hooks/useIpcEvents-cli-worktree-activation.test.ts
+++ b/src/renderer/src/hooks/useIpcEvents-cli-worktree-activation.test.ts
@@ -194,6 +194,7 @@ describe('useIpcEvents CLI-created worktree activation', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
@@ -464,6 +465,7 @@ describe('useIpcEvents CLI-created worktree activation', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
diff --git a/src/renderer/src/hooks/useIpcEvents-close-routing-browser-pages.test.ts b/src/renderer/src/hooks/useIpcEvents-close-routing-browser-pages.test.ts
index 86de4ce12dc..b20de4a6d69 100644
--- a/src/renderer/src/hooks/useIpcEvents-close-routing-browser-pages.test.ts
+++ b/src/renderer/src/hooks/useIpcEvents-close-routing-browser-pages.test.ts
@@ -200,6 +200,7 @@ describe('useIpcEvents browser tab close routing', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
@@ -430,6 +431,7 @@ describe('useIpcEvents browser tab close routing', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
@@ -655,6 +657,7 @@ describe('useIpcEvents browser tab close routing', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
diff --git a/src/renderer/src/hooks/useIpcEvents-ssh-disconnect-cleanup.test.ts b/src/renderer/src/hooks/useIpcEvents-ssh-disconnect-cleanup.test.ts
index 6832ab98de2..1c351de3cb1 100644
--- a/src/renderer/src/hooks/useIpcEvents-ssh-disconnect-cleanup.test.ts
+++ b/src/renderer/src/hooks/useIpcEvents-ssh-disconnect-cleanup.test.ts
@@ -199,6 +199,7 @@ describe('useIpcEvents updater integration', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
diff --git a/src/renderer/src/hooks/useIpcEvents-updater-status.test.ts b/src/renderer/src/hooks/useIpcEvents-updater-status.test.ts
index dde430feb93..1ae3df89d45 100644
--- a/src/renderer/src/hooks/useIpcEvents-updater-status.test.ts
+++ b/src/renderer/src/hooks/useIpcEvents-updater-status.test.ts
@@ -169,6 +169,7 @@ describe('useIpcEvents updater integration', () => {
         browser: {
           onGuestLoadFailed: () => () => {},
           onOpenLinkInOrcaTab: () => () => {},
+          onSessionProfilesChanged: () => () => {},
           onNavigationUpdate: () => () => {},
           onActivateView: () => () => {},
           onPaneFocus: () => () => {}
diff --git a/src/renderer/src/runtime/runtime-client-events.ts b/src/renderer/src/runtime/runtime-client-events.ts
index e113312ba60..26311b9fcb5 100644
--- a/src/renderer/src/runtime/runtime-client-events.ts
+++ b/src/renderer/src/runtime/runtime-client-events.ts
@@ -91,6 +91,7 @@ function isRuntimeClientEvent(
     message.type === 'terminalSideEffects' ||
     message.type === 'sshStateChanged' ||
     message.type === 'automationsChanged' ||
+    message.type === 'browserProfilesChanged' ||
     message.type === 'linearLinkedIssueUpdated' ||
     message.type === 'activateWorktree' ||
     message.type === 'worktreeTerminalSleepState'
diff --git a/src/renderer/src/store/slices/browser-session-profiles.test.ts b/src/renderer/src/store/slices/browser-session-profiles.test.ts
index cb126274c1c..0ab5af78d10 100644
--- a/src/renderer/src/store/slices/browser-session-profiles.test.ts
+++ b/src/renderer/src/store/slices/browser-session-profiles.test.ts
@@ -86,6 +86,21 @@ describe('createBrowserSlice runtime guard', () => {
     ])
   })
 
+  it('keeps the default profile pick when a server profile fetch fails', async () => {
+    const store = createTestStore()
+    runtimeEnvironmentCall.mockRejectedValueOnce(new Error('timed out'))
+    store.setState({
+      settings: settingsWithRuntime('env-1'),
+      defaultBrowserSessionProfileId: 'work',
+      defaultBrowserSessionProfileIdByHostId: { 'runtime:env-1': 'work' }
+    })
+
+    await store.getState().fetchBrowserSessionProfiles()
+
+    expect(store.getState().defaultBrowserSessionProfileId).toBe('work')
+    expect(store.getState().defaultBrowserSessionProfileIdByHostId['runtime:env-1']).toBe('work')
+  })
+
   it('creates a profile in the active runtime environment', async () => {
     const store = createTestStore()
     const profile = {
@@ -349,6 +364,53 @@ describe('createBrowserSlice runtime guard', () => {
     ])
   })
 
+  it('drops the default profile pick once a refreshed list no longer has it', async () => {
+    const store = createTestStore()
+    const listed = (id: string) => ({
+      id,
+      scope: id === 'default' ? ('default' as const) : ('isolated' as const),
+      partition: `persist:${id}`,
+      label: id,
+      source: null
+    })
+    store.setState({
+      defaultBrowserSessionProfileId: 'work',
+      defaultBrowserSessionProfileIdByHostId: { local: 'work' }
+    })
+    mockApi.browser.sessionListProfiles
+      .mockResolvedValueOnce([listed('default'), listed('work')])
+      .mockResolvedValueOnce([listed('default')])
+
+    await store.getState().fetchBrowserSessionProfiles('local')
+    expect(store.getState().defaultBrowserSessionProfileIdByHostId.local).toBe('work')
+
+    await store.getState().fetchBrowserSessionProfiles('local')
+    expect(store.getState().defaultBrowserSessionProfileId).toBeNull()
+    expect(store.getState().defaultBrowserSessionProfileIdByHostId.local).toBeNull()
+  })
+
+  it('keeps the newest listing when an older one answers last', async () => {
+    const store = createTestStore()
+    const listed = (id: string) => ({
+      id,
+      scope: id === 'default' ? ('default' as const) : ('isolated' as const),
+      partition: `persist:${id}`,
+      label: id,
+      source: null
+    })
+    const older = Promise.withResolvers<ReturnType<typeof listed>[]>()
+    mockApi.browser.sessionListProfiles
+      .mockReturnValueOnce(older.promise)
+      .mockResolvedValueOnce([listed('default')])
+
+    const olderFetch = store.getState().fetchBrowserSessionProfiles('local')
+    await store.getState().fetchBrowserSessionProfiles('local')
+    older.resolve([listed('default'), listed('deleted')])
+    await olderFetch
+
+    expect(store.getState().browserSessionProfilesByHostId.local).toEqual([listed('default')])
+  })
+
   it('creates a profile through local browser IPC', async () => {
     const store = createTestStore()
     const profile = {
diff --git a/src/renderer/src/store/slices/browser/browser-host-state.ts b/src/renderer/src/store/slices/browser/browser-host-state.ts
index 5c1865aa1f5..a0adcb29316 100644
--- a/src/renderer/src/store/slices/browser/browser-host-state.ts
+++ b/src/renderer/src/store/slices/browser/browser-host-state.ts
@@ -138,6 +138,32 @@ export function profileListByHostUpdate(
   }
 }
 
+/** A host's full listing; it also drops a default pick the host no longer lists, so new tabs don't open on a deleted profile. */
+export function listedProfilesByHostUpdate(
+  state: AppState,
+  profiles: BrowserSessionProfile[],
+  hostId: ExecutionHostId
+): Partial<BrowserSlice> {
+  const isUnlisted = (profileId: string | null | undefined): boolean =>
+    !!profileId && !profiles.some((profile) => profile.id === profileId)
+  const update = profileListByHostUpdate(state, profiles, hostId)
+  return {
+    ...update,
+    // Why: the unkeyed default belongs to the Settings host, the one whose list the mirror follows.
+    ...(update.browserSessionProfiles && isUnlisted(state.defaultBrowserSessionProfileId)
+      ? { defaultBrowserSessionProfileId: null }
+      : {}),
+    ...(isUnlisted(state.defaultBrowserSessionProfileIdByHostId[hostId])
+      ? {
+          defaultBrowserSessionProfileIdByHostId: {
+            ...state.defaultBrowserSessionProfileIdByHostId,
+            [hostId]: null
+          }
+        }
+      : {})
+  }
+}
+
 export function getBrowserProfilesForHost(
   state: AppState,
   hostId: ExecutionHostId
diff --git a/src/renderer/src/store/slices/browser/browser-managed-profile-actions.ts b/src/renderer/src/store/slices/browser/browser-managed-profile-actions.ts
index ee1eb310b78..5aeb696c0c5 100644
--- a/src/renderer/src/store/slices/browser/browser-managed-profile-actions.ts
+++ b/src/renderer/src/store/slices/browser/browser-managed-profile-actions.ts
@@ -5,6 +5,7 @@ import { LOCAL_EXECUTION_HOST_ID } from '../../../../../shared/execution-host'
 import {
   isManagedBrowserProfileOf,
   managedBrowserProfileOwnerKey,
+  unadmittedBrowserPartition,
   type ManagedBrowserProfileOwner
 } from '../../../../../shared/browser-profile-scope'
 import { withoutKey } from '../../../../../shared/workspace-layout/stored-record-fields'
@@ -16,7 +17,7 @@ const placeholderProfile = (
   sessionProfileId: string
 ): { sessionProfileId: string; sessionPartition: string } => ({
   sessionProfileId,
-  sessionPartition: `persist:orca-browser-unminted-${sessionProfileId}`
+  sessionPartition: unadmittedBrowserPartition(sessionProfileId)
 })
 
 const localProfiles = (state: AppState): BrowserSessionProfile[] =>
diff --git a/src/renderer/src/store/slices/browser/browser-profile-list-actions.ts b/src/renderer/src/store/slices/browser/browser-profile-list-actions.ts
index b1b5f4de9b0..07e77c7c049 100644
--- a/src/renderer/src/store/slices/browser/browser-profile-list-actions.ts
+++ b/src/renderer/src/store/slices/browser/browser-profile-list-actions.ts
@@ -5,14 +5,15 @@ import type {
   BrowserProfileDeleteResult,
   BrowserProfileListResult
 } from '../../../../../shared/runtime-types'
-import { parseExecutionHostId } from '../../../../../shared/execution-host'
+import { parseExecutionHostId, type ExecutionHostId } from '../../../../../shared/execution-host'
 import { callRuntimeRpc } from '@/runtime/runtime-rpc-client'
 import {
   getBrowserProfilesForHost,
   getBrowserSettingsHostId,
   getBrowserSettingsRuntimeEnvironmentId,
   profileListByHostUpdate,
-  getDefaultBrowserProfileForHost
+  getDefaultBrowserProfileForHost,
+  listedProfilesByHostUpdate
 } from './browser-host-state'
 
 export function createBrowserProfileListActions(
@@ -22,9 +23,15 @@ export function createBrowserProfileListActions(
   BrowserSlice,
   'fetchBrowserSessionProfiles' | 'createBrowserSessionProfile' | 'deleteBrowserSessionProfile'
 > {
+  // Why: change events can overlap fetches; only the latest listing per host may land, or an older one restores a deleted profile.
+  const latestListingByHost = new Map<ExecutionHostId, number>()
+  let listingCount = 0
   return {
     fetchBrowserSessionProfiles: async (requestedHostId) => {
       const hostId = requestedHostId ?? getBrowserSettingsHostId(get())
+      const listing = ++listingCount
+      latestListingByHost.set(hostId, listing)
+      const isLatest = (): boolean => latestListingByHost.get(hostId) === listing
       const parsedHostId = parseExecutionHostId(hostId)
       const runtimeEnvironmentId =
         parsedHostId?.kind === 'runtime' ? parsedHostId.environmentId : null
@@ -47,15 +54,21 @@ export function createBrowserProfileListActions(
               ? { ...profile, source: clientImportSources[profile.id] }
               : profile
           )
-          set((s) => profileListByHostUpdate(s, profiles, hostId))
+          if (isLatest()) {
+            set((s) => listedProfilesByHostUpdate(s, profiles, hostId))
+          }
         } catch {
-          set((s) => profileListByHostUpdate(s, [], hostId))
+          if (isLatest()) {
+            set((s) => profileListByHostUpdate(s, [], hostId))
+          }
         }
         return
       }
       try {
         const profiles = (await window.api.browser.sessionListProfiles()) as BrowserSessionProfile[]
-        set((s) => profileListByHostUpdate(s, profiles, hostId))
+        if (isLatest()) {
+          set((s) => listedProfilesByHostUpdate(s, profiles, hostId))
+        }
       } catch {
         /* best-effort — stale profile list is preferable to a crash */
       }
diff --git a/src/renderer/src/web/preload-api/web-browser-api.ts b/src/renderer/src/web/preload-api/web-browser-api.ts
index 96fa2e39bfb..3fde1a06553 100644
--- a/src/renderer/src/web/preload-api/web-browser-api.ts
+++ b/src/renderer/src/web/preload-api/web-browser-api.ts
@@ -3,6 +3,7 @@ import { translate } from '@/i18n/i18n'
 import { noopUnsubscribe } from './web-storage'
 
 export function createBrowserApi(): NonNullable<Partial<PreloadApi>['browser']> {
+  // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: a partial stub; withFallback in web-preload-api answers every browser member it omits.
   return {
     registerGuest: () => Promise.resolve(false),
     isGuestRegistered: () => Promise.resolve(false),
@@ -65,6 +66,7 @@ export function createBrowserApi(): NonNullable<Partial<PreloadApi>['browser']>
     onGrabModeToggle: () => noopUnsubscribe,
     onGrabActionShortcut: () => noopUnsubscribe,
     sessionListProfiles: () => Promise.resolve([]),
+    onSessionProfilesChanged: () => noopUnsubscribe,
     // Web clients render remote workspaces through the server; no local SSH routing exists.
     prepareSshWorkspacePartition: () =>
       Promise.reject(new Error('browser_local_route_unavailable')),
diff --git a/src/shared/browser-profile-scope.ts b/src/shared/browser-profile-scope.ts
index 6f86a9d422e..e621cac74e8 100644
--- a/src/shared/browser-profile-scope.ts
+++ b/src/shared/browser-profile-scope.ts
@@ -31,3 +31,8 @@ export function isManagedBrowserProfileOf(
 ): boolean {
   return profile.owner?.kind === owner.kind && profile.owner.id === owner.id
 }
+
+/** A partition main never admits, so a tab whose profile main has not made, or has deleted, loads nowhere. */
+export function unadmittedBrowserPartition(profileId: string): string {
+  return `persist:orca-browser-unminted-${profileId}`
+}
diff --git a/src/shared/runtime-client-events.ts b/src/shared/runtime-client-events.ts
index 4c2a58fe1fb..2086b58850d 100644
--- a/src/shared/runtime-client-events.ts
+++ b/src/shared/runtime-client-events.ts
@@ -45,6 +45,8 @@ export type RuntimeClientEvent =
       selector?: { kind: 'self' } | { kind: 'ssh'; targetId: string } | { kind: 'orphan' }
       reason?: 'definition' | 'run' | 'usage'
     }
+  // Why: browser profiles live on the host; old clients drop the unknown type and refetch on their old triggers.
+  | { type: 'browserProfilesChanged' }
   | {
       type: 'linearLinkedIssueUpdated'
       worktreeId: string