diff --git a/src/main/runtime/rpc/methods/session-tabs.ts b/src/main/runtime/rpc/methods/session-tabs.ts
index 36b9c3bd68c..11440e01fe1 100644
--- a/src/main/runtime/rpc/methods/session-tabs.ts
+++ b/src/main/runtime/rpc/methods/session-tabs.ts
@@ -22,6 +22,7 @@ import { assertLegacyAiVaultResumeCommandAllowed } from '../../../ai-vault/struc
 import { SessionTabsUnsubscribeAllParams } from '../../../../shared/rpc-contract/session-tabs-params'
 import { SESSION_TABS_SPLIT_GROUP_PLACEMENT_RUNTIME_CAPABILITY } from '../../../../shared/protocol-version'
 import { createSessionTabsTabDeltaEncoder } from '../../../../shared/session-tabs-tab-delta'
+import { ORCA_SIDEBAR_INPUTS_IS_MAIN } from '../../../../shared/sidebar-inputs-switch'
 
 export const SESSION_TAB_METHODS = [
   defineMethod({
@@ -128,6 +129,11 @@ export const SESSION_TAB_METHODS = [
         // Why: shared-control can carry multiple subscribers for one worktree on
         // one socket; include the RPC id so one subscriber cannot evict another.
         subscriptionId = requestId ? `${cleanupPrefix}:${requestId}` : cleanupPrefix
+        // Switch point: a phone holding the workspace's session open is looking at it.
+        const closePhoneSession =
+          ORCA_SIDEBAR_INPUTS_IS_MAIN && clientKind === 'mobile'
+            ? runtime.sidebarFacts?.readAndHoldPhoneSession(worktreeId)
+            : undefined
         runtime.registerSubscriptionCleanup(
           subscriptionId,
           () => {
@@ -135,6 +141,7 @@ export const SESSION_TAB_METHODS = [
               return
             }
             released = true
+            closePhoneSession?.()
             signal?.removeEventListener('abort', release)
             stopListening()
             if (endOnRelease) {
diff --git a/src/main/runtime/rpc/methods/sidebar-inputs.ts b/src/main/runtime/rpc/methods/sidebar-inputs.ts
index fa3c5a35d00..3ee1519c57a 100644
--- a/src/main/runtime/rpc/methods/sidebar-inputs.ts
+++ b/src/main/runtime/rpc/methods/sidebar-inputs.ts
@@ -7,6 +7,7 @@ import { SidebarSessionBeginParams } from '../../../../shared/rpc-contract/sideb
 import { RepoIconDataUrlsParams } from '../../../../shared/sidebar-list/repo-icon-data-urls-contract'
 import { SetCollapsedParams } from '../../../../shared/rpc-contract/workspace-view-collapse-params'
 import { setCollapsedSection } from '../../workspace-view-collapse-writes'
+import { ClientWorkspaceViewParams } from '../../../../shared/rpc-contract/client-workspace-view-params'
 
 // Registered only with ORCA_SIDEBAR_INPUTS=main, so the producers below always exist.
 
@@ -101,6 +102,27 @@ export const SIDEBAR_INPUT_METHODS = [
     handler: async (_params, { runtime }) =>
       requireSwitchedOn(runtime.workspaceCreations).snapshot()
   }),
+  defineMethod({
+    name: 'sidebarInputs.reportView',
+    permission: 'workspace',
+    params: ClientWorkspaceViewParams,
+    // What a client window shows, so this host raises no unread flag on it; held until it closes.
+    handler: async (params, { runtime, connectionId, signal }) => {
+      const viewers = requireSwitchedOn(runtime.sidebarFacts).workspaceViewers
+      // A view outlives the call, so it needs a connection whose close drops it.
+      if (connectionId === undefined || signal?.aborted) {
+        throw new Error('client_disconnected')
+      }
+      if (viewers.reportClientView(connectionId, params)) {
+        runtime.registerSubscriptionCleanup(
+          `sidebar-view-${connectionId}`,
+          () => viewers.dropClient(connectionId),
+          connectionId
+        )
+      }
+      return { ok: true }
+    }
+  }),
   defineMethod({
     name: 'ui.setCollapsed',
     permission: 'workspace',
diff --git a/src/main/runtime/sidebar-inputs/orca-runtime-sidebar-temporal.ts b/src/main/runtime/sidebar-inputs/orca-runtime-sidebar-temporal.ts
index 94cfd7765ce..d3dbb62807c 100644
--- a/src/main/runtime/sidebar-inputs/orca-runtime-sidebar-temporal.ts
+++ b/src/main/runtime/sidebar-inputs/orca-runtime-sidebar-temporal.ts
@@ -7,7 +7,9 @@ import {
   getConnectionExecutionHostId,
   getRepoExecutionHostId,
   isLocalExecutionHost,
-  LOCAL_EXECUTION_HOST_ID
+  LOCAL_EXECUTION_HOST_ID,
+  parseExecutionHostId,
+  type ExecutionHostId
 } from '../../../shared/execution-host'
 import type { SidebarTemporalSnapshot } from '../../../shared/sidebar-list/sidebar-temporal-snapshot'
 import type { Worktree } from '../../../shared/worktree/types'
@@ -15,6 +17,8 @@ import type { Repo } from '../../../shared/repo-types'
 import { SidebarRetentionOwner, type SidebarRetentionCandidates } from './sidebar-retention-owner'
 import type { AgentStatusStoreView } from './workspace-activity-facts-producer'
 import { SortStampsProducer } from './sort-stamps-producer'
+import { writeUnreadFlag } from './sort-stamp-records'
+import { WorkspaceViewers } from './workspace-viewers'
 import { TerminalUseProducer } from './terminal-use-producer'
 import { parseWorkspaceKey } from '../../../shared/workspace-scope'
 import { getRepoIdFromWorktreeId } from '../../../shared/worktree/id'
@@ -36,6 +40,7 @@ export abstract class OrcaRuntimeWithSidebarTemporal extends OrcaRuntimeWithWork
     listRows: () => this.listSidebarRows(),
     retentionCandidates: () => this.readSidebarRetentionCandidates()
   })
+  readonly workspaceViewers = new WorkspaceViewers(Date.now)
   readonly sortStamps = new SortStampsProducer({
     store: () => this.store,
     isWriteFenced: (worktreeId) =>
@@ -43,6 +48,7 @@ export abstract class OrcaRuntimeWithSidebarTemporal extends OrcaRuntimeWithWork
     resolveTabWorktreeId: (tabId) => this.tabs.get(tabId)?.worktreeId,
     subscribeToPtyExit: (ptyId, listener) => this.subscribeToPtyExit(ptyId, listener),
     onClientEvent: (listener, options) => this.onClientEvent(listener, options),
+    isViewing: (worktreeId, paneKey) => this.workspaceViewers.isViewing(worktreeId, paneKey),
     onStampsWritten: (worktreeId) => this.notifySortStampsChanged(worktreeId),
     now: Date.now
   })
@@ -100,15 +106,7 @@ export abstract class OrcaRuntimeWithSidebarTemporal extends OrcaRuntimeWithWork
     await this.sortStamps
       .reconcileStoredTiers({
         isLocalWorkspace: (worktreeId) =>
-          !!store &&
-          isLocalExecutionHost(
-            resolveAgentWorkspaceExecutionHostId(worktreeId, {
-              getRepo: (repoId) => store.getRepo(repoId),
-              getWorktreeMeta: (id) => store.getWorktreeMeta(id),
-              getFolderWorkspace: (id) => store.getFolderWorkspace?.(id),
-              getProjectGroups: () => store.getProjectGroups?.() ?? []
-            })
-          ),
+          !!store && isLocalExecutionHost(this.workspaceHostId(worktreeId)),
         terminalPtyIds: (worktreeId) => {
           const session = store?.getWorkspaceSession?.(LOCAL_EXECUTION_HOST_ID)
           const ptyIds = new Set<string>()
@@ -135,6 +133,31 @@ export abstract class OrcaRuntimeWithSidebarTemporal extends OrcaRuntimeWithWork
       .catch((error: unknown) => console.warn('[sidebar] sort tier reconcile failed:', error))
   }
 
+  /** A phone holding the workspace's session open has it on screen: its flag is read and stays down. */
+  readAndHoldPhoneSession(worktreeId: string): () => void {
+    const hostId = this.workspaceHostId(worktreeId)
+    const workspace = {
+      worktreeId,
+      sshHostId: hostId && parseExecutionHostId(hostId)?.kind === 'ssh' ? hostId : null
+    }
+    if (writeUnreadFlag(this.store, workspace, false)) {
+      this.notifySortStampsChanged(worktreeId)
+    }
+    return this.workspaceViewers.openPhoneSession(worktreeId)
+  }
+
+  private workspaceHostId(worktreeId: string): ExecutionHostId | null {
+    const store = this.store
+    return store
+      ? resolveAgentWorkspaceExecutionHostId(worktreeId, {
+          getRepo: (repoId) => store.getRepo(repoId),
+          getWorktreeMeta: (id) => store.getWorktreeMeta(id),
+          getFolderWorkspace: (id) => store.getFolderWorkspace?.(id),
+          getProjectGroups: () => store.getProjectGroups?.() ?? []
+        })
+      : null
+  }
+
   // Metadata only: clients re-list the record, and the cached git scans stay.
   private notifySortStampsChanged(worktreeId: string): void {
     if (parseWorkspaceKey(worktreeId)?.type === 'folder') {
diff --git a/src/main/runtime/sidebar-inputs/orca-runtime-sort-stamps.test.ts b/src/main/runtime/sidebar-inputs/orca-runtime-sort-stamps.test.ts
index 3b644580453..f6543d6a603 100644
--- a/src/main/runtime/sidebar-inputs/orca-runtime-sort-stamps.test.ts
+++ b/src/main/runtime/sidebar-inputs/orca-runtime-sort-stamps.test.ts
@@ -98,7 +98,13 @@ describe('host sort stamps on a headless runtime', () => {
         worktreeId: WT,
         payload: { state: 'waiting', prompt: 'task', agentType: 'claude' }
       })
-      expect(meta[WT]).toEqual({ lastActivityAt: 70_000, smartTier: 'needs-you', smartAt: 70_000 })
+      // No client is looking, so the request for input also raises the unread flag.
+      expect(meta[WT]).toEqual({
+        lastActivityAt: 70_000,
+        smartTier: 'needs-you',
+        smartAt: 70_000,
+        isUnread: true
+      })
     } finally {
       vi.useRealTimers()
     }
diff --git a/src/main/runtime/sidebar-inputs/orca-runtime-workspace-unread.test.ts b/src/main/runtime/sidebar-inputs/orca-runtime-workspace-unread.test.ts
new file mode 100644
index 00000000000..5cb566467ef
--- /dev/null
+++ b/src/main/runtime/sidebar-inputs/orca-runtime-workspace-unread.test.ts
@@ -0,0 +1,184 @@
+// Runs on plain Node, as orcad does: a host with no window raises and clears its own unread flags.
+import '../rpc/unused-default-rpc-methods.test-fixture'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { HEADLESS_RUNTIME_WINDOW_ID } from '../../../shared/runtime-session-contracts'
+import { folderWorkspaceKey } from '../../../shared/workspace-scope'
+import { AgentHookServer } from '../../agent-hooks/server'
+import { OrcaRuntimeService } from '../orca-runtime'
+import type { RuntimeStore } from '../runtime-store-contract'
+import { RpcDispatcher } from '../rpc/dispatcher'
+import type { RpcDispatchStreamingOptions } from '../rpc/dispatcher-stream-options'
+import { SESSION_TAB_METHODS } from '../rpc/methods/session-tabs'
+import { SIDEBAR_INPUT_METHODS } from '../rpc/methods/sidebar-inputs'
+
+vi.mock('../../../shared/sidebar-inputs-switch', () => ({ ORCA_SIDEBAR_INPUTS_IS_MAIN: true }))
+
+const WT = 'repo-1::/tmp/worktree-a'
+const SSH_WT = 'repo-ssh::/home/me/worktree-b'
+const FOLDER_ID = '11111111-1111-4111-8111-111111111111'
+const FOLDER = folderWorkspaceKey(FOLDER_ID)
+const LEAF = '22222222-2222-4222-8222-222222222222'
+const PANE = `tab-1:${LEAF}`
+const PHONE: RpcDispatchStreamingOptions = { clientKind: 'mobile', connectionId: 'phone-1' }
+
+type Flag = { lastActivityAt: number; isUnread: boolean }
+
+function createHeadlessHost() {
+  const meta: Record<string, Flag> = { [WT]: { lastActivityAt: 0, isUnread: false } }
+  const sshMeta: Record<string, Flag> = { [SSH_WT]: { lastActivityAt: 0, isUnread: false } }
+  const folders: Record<string, Flag & { projectGroupId: string }> = {
+    [FOLDER_ID]: { lastActivityAt: 0, isUnread: false, projectGroupId: 'group-1' }
+  }
+  const repos = [
+    { id: 'repo-1', connectionId: null },
+    { id: 'repo-ssh', connectionId: 'build-box' }
+  ]
+  const store = {
+    getRepos: () => repos,
+    getRepo: (id: string) => repos.find((repo) => repo.id === id),
+    getProjectGroups: () => [{ id: 'group-1', connectionId: null }],
+    getSettings: () => ({}),
+    getWorktreeMeta: (id: string) => meta[id],
+    getAllWorktreeMeta: () => meta,
+    setWorktreeMeta: (id: string, updates: Partial<Flag>) => Object.assign(meta[id], updates),
+    getWorktreeMetaForHost: (id: string, hostId: string) =>
+      hostId === 'ssh:build-box' ? sshMeta[id] : undefined,
+    setWorktreeMetaForHost: (id: string, _hostId: string, updates: Partial<Flag>) =>
+      Object.assign(sshMeta[id], updates),
+    getFolderWorkspace: (id: string) => folders[id],
+    updateFolderWorkspace: (id: string, updates: Partial<Flag>) =>
+      Object.assign(folders[id], updates)
+  }
+  // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: the unread path reads only these members.
+  const runtime = new OrcaRuntimeService(store as unknown as RuntimeStore)
+  runtime.syncWindowGraph(HEADLESS_RUNTIME_WINDOW_ID, {
+    tabs: [{ tabId: 'tab-1', worktreeId: WT, title: 'Agent', activeLeafId: LEAF, layout: null }],
+    leaves: [
+      {
+        tabId: 'tab-1',
+        worktreeId: WT,
+        leafId: LEAF,
+        paneRuntimeId: 1,
+        ptyId: 'pty-1',
+        paneTitle: null
+      }
+    ]
+  })
+  const server = new AgentHookServer()
+  runtime.sidebarFacts?.attachSidebarAgentStatusStore(server)
+  const dispatcher = new RpcDispatcher({
+    runtime,
+    methods: [...SIDEBAR_INPUT_METHODS, ...SESSION_TAB_METHODS]
+  })
+  let requestId = 0
+  const finishTurn = (worktreeId = WT, connectionId?: string): void => {
+    for (const state of ['working', 'done'] as const) {
+      server.ingestTerminalStatus({
+        paneKey: PANE,
+        tabId: 'tab-1',
+        worktreeId,
+        ...(connectionId ? { connectionId } : {}),
+        payload: { state, prompt: 'task', agentType: 'claude' }
+      })
+    }
+  }
+  return {
+    runtime,
+    meta,
+    sshMeta,
+    folders,
+    finishTurn,
+    // The phone's session screen holds this stream while the workspace is open on it.
+    openOnPhone: (worktreeId: string) =>
+      dispatcher.dispatchStreaming(
+        {
+          id: `sub-${++requestId}`,
+          authToken: 'tok',
+          method: 'session.tabs.subscribe',
+          params: { worktree: `id:${worktreeId}` }
+        },
+        () => {},
+        PHONE
+      ),
+    reportView: (params: unknown, connectionId: string | undefined) =>
+      dispatcher.dispatch(
+        { id: `view-${++requestId}`, authToken: 'tok', method: 'sidebarInputs.reportView', params },
+        { clientKind: 'runtime', connectionId }
+      )
+  }
+}
+
+beforeEach(() => {
+  vi.spyOn(console, 'warn').mockImplementation(() => {})
+})
+
+afterEach(() => {
+  vi.restoreAllMocks()
+})
+
+describe('workspace unread flag on a headless host', () => {
+  it('flags a finish no one sees, clears it when the phone opens it, and spares it while open', async () => {
+    const host = createHeadlessHost()
+    host.finishTurn()
+    expect(host.meta[WT].isUnread).toBe(true)
+
+    await host.openOnPhone(WT)
+    expect(host.meta[WT].isUnread).toBe(false)
+    host.finishTurn()
+    expect(host.meta[WT].isUnread).toBe(false)
+
+    // Leaving the session (its stream closes with the connection) makes the next finish news.
+    host.runtime.cleanupSubscriptionsForConnection('phone-1')
+    host.finishTurn()
+    expect(host.meta[WT].isUnread).toBe(true)
+  })
+
+  it('clears a folder workspace and an SSH worktree on their own records when the phone opens them', async () => {
+    const host = createHeadlessHost()
+    host.folders[FOLDER_ID].isUnread = true
+    host.sshMeta[SSH_WT].isUnread = true
+    await host.openOnPhone(FOLDER)
+    expect(host.folders[FOLDER_ID].isUnread).toBe(false)
+    await host.openOnPhone(SSH_WT)
+    expect(host.sshMeta[SSH_WT].isUnread).toBe(false)
+
+    // The SSH finish raises the SSH host's record once the phone has left.
+    host.runtime.cleanupSubscriptionsForConnection('phone-1')
+    host.finishTurn(SSH_WT, 'build-box')
+    expect(host.sshMeta[SSH_WT].isUnread).toBe(true)
+  })
+
+  it('spares the tab a client window shows while its user is present', async () => {
+    vi.useFakeTimers({ now: 10_000, toFake: ['Date'] })
+    try {
+      const host = createHeadlessHost()
+      const view = { workspaceIds: [WT], tabIds: ['tab-1'], presentForMs: 60_000 }
+      expect(await host.reportView(view, 'desktop-1')).toMatchObject({ ok: true })
+      host.finishTurn()
+      expect(host.meta[WT].isUnread).toBe(false)
+
+      // Another tab on screen is not this pane's.
+      await host.reportView({ ...view, tabIds: ['tab-2'] }, 'desktop-1')
+      host.finishTurn()
+      expect(host.meta[WT].isUnread).toBe(true)
+
+      host.meta[WT].isUnread = false
+      await host.reportView(view, 'desktop-1')
+      vi.setSystemTime(10_000 + 60_000)
+      host.finishTurn()
+      expect(host.meta[WT].isUnread).toBe(true)
+
+      // A client that disconnects stops counting; one with no connection cannot report.
+      expect(await host.reportView(view, undefined)).toMatchObject({ ok: false })
+      host.meta[WT].isUnread = false
+      await host.reportView({ ...view, presentForMs: null }, 'desktop-1')
+      host.finishTurn()
+      expect(host.meta[WT].isUnread).toBe(false)
+      host.runtime.cleanupSubscriptionsForConnection('desktop-1')
+      host.finishTurn()
+      expect(host.meta[WT].isUnread).toBe(true)
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+})
diff --git a/src/main/runtime/sidebar-inputs/sort-stamp-records.ts b/src/main/runtime/sidebar-inputs/sort-stamp-records.ts
index fe8a2dd7665..afbb7da86f1 100644
--- a/src/main/runtime/sidebar-inputs/sort-stamp-records.ts
+++ b/src/main/runtime/sidebar-inputs/sort-stamp-records.ts
@@ -6,7 +6,7 @@ import type {
 } from '../../../shared/sidebar-list/sort-stamps'
 import { folderWorkspaceKey, parseWorkspaceKey } from '../../../shared/workspace-scope'
 
-type StampedRecord = { lastActivityAt: number } & SmartStampFields
+type StampedRecord = { lastActivityAt: number; isUnread?: boolean } & SmartStampFields
 type StampUpdates = {
   lastActivityAt: number
   smartTier: SmartTier | undefined
@@ -27,8 +27,10 @@ export type WorkspaceRecordStore<TRecord, TUpdates> = {
   updateFolderWorkspace?: (folderWorkspaceId: string, updates: TUpdates) => unknown
 }
 
-/** The record reads and writes stamping needs. */
-export type SortStampsStore = WorkspaceRecordStore<StampedRecord, StampUpdates> & {
+type UnreadUpdate = { isUnread: boolean }
+
+/** The record reads and writes stamping and the unread flag need. */
+export type SortStampsStore = WorkspaceRecordStore<StampedRecord, StampUpdates | UnreadUpdate> & {
   getAllWorktreeMeta?: () => Record<string, StampedRecord>
   getFolderWorkspaces?: () => readonly (StampedRecord & { id: string })[]
 }
@@ -64,6 +66,21 @@ export function writeWorkspaceRecord<TUpdates>(
   }
 }
 
+/** Sets the workspace's unread flag; true when its record held the other value. */
+export function writeUnreadFlag(
+  store: SortStampsStore | null,
+  workspace: WorkspaceRef,
+  isUnread: boolean
+): boolean {
+  const record = readWorkspaceRecord(store, workspace)
+  // Only a workspace with a record is written; writing would create one for a stale id.
+  if (!record || Boolean(record.isUnread) === isUnread) {
+    return false
+  }
+  writeWorkspaceRecord<UnreadUpdate>(store, workspace, { isUnread })
+  return true
+}
+
 // Only a workspace with a record is stamped; writing would create one for a stale id.
 export function readSortStamps(
   store: SortStampsStore | null,
diff --git a/src/main/runtime/sidebar-inputs/sort-stamps-producer.test.ts b/src/main/runtime/sidebar-inputs/sort-stamps-producer.test.ts
index b061b081c06..a6445352537 100644
--- a/src/main/runtime/sidebar-inputs/sort-stamps-producer.test.ts
+++ b/src/main/runtime/sidebar-inputs/sort-stamps-producer.test.ts
@@ -22,7 +22,7 @@ const PANE = 'tab-a:22222222-2222-4222-8222-222222222222'
 const TITLE_PANE = 'tab-t:33333333-3333-4333-8333-333333333333'
 const T0 = 1_000_000
 
-type Stamps = { lastActivityAt: number } & SmartStampFields
+type Stamps = { lastActivityAt: number; isUnread?: boolean } & SmartStampFields
 const SSH_HOST = 'ssh:build-box'
 
 function createHarness() {
@@ -36,21 +36,23 @@ function createHarness() {
   const fenced = new Set<string>()
   const notified: string[] = []
   let listener: (event: RuntimeClientEvent) => void = () => {}
+  // Stamping tests watch every workspace, so no unread flag is raised; the unread tests unwatch.
+  const viewing = { isViewing: (_id: string, _pane: string | null): boolean => true }
   const store: SortStampsStore = {
     getWorktreeMeta: (id) => meta.get(id),
     setWorktreeMeta: (id, updates) => {
       writes.push(id)
-      meta.set(id, { ...meta.get(id), ...updates })
+      meta.set(id, { lastActivityAt: 0, ...meta.get(id), ...updates })
     },
     getWorktreeMetaForHost: (id, hostId) => (hostId === SSH_HOST ? sshMeta.get(id) : undefined),
     setWorktreeMetaForHost: (id, hostId, updates) => {
       writes.push(`${hostId}|${id}`)
-      sshMeta.set(id, { ...sshMeta.get(id), ...updates })
+      sshMeta.set(id, { lastActivityAt: 0, ...sshMeta.get(id), ...updates })
     },
     getFolderWorkspace: (id) => folders.get(id),
     updateFolderWorkspace: (id, updates) => {
       writes.push(`folder:${id}`)
-      folders.set(id, { ...folders.get(id), ...updates })
+      folders.set(id, { lastActivityAt: 0, ...folders.get(id), ...updates })
     },
     getAllWorktreeMeta: () => Object.fromEntries(meta),
     getFolderWorkspaces: () => [...folders].map(([id, folder]) => ({ id, ...folder }))
@@ -68,6 +70,7 @@ function createHarness() {
       listener = next
       return () => {}
     },
+    isViewing: (id, pane) => viewing.isViewing(id, pane),
     onStampsWritten: (id) => notified.push(id),
     now: () => Date.now()
   })
@@ -82,6 +85,7 @@ function createHarness() {
     exits,
     fenced,
     notified,
+    viewing,
     sideEffects: (
       facts: TerminalSideEffectFact[],
       extra: { pane?: string; ptyId?: string; connectionId?: string } = {}
@@ -455,3 +459,86 @@ describe('SortStampsProducer: startup reconcile', () => {
     expect(h.writes).toEqual([])
   })
 })
+
+describe('SortStampsProducer: unread flag', () => {
+  function unwatched() {
+    const h = createHarness()
+    h.viewing.isViewing = () => false
+    h.producer.attachAgentStatusStore(h.server)
+    return h
+  }
+
+  it('raises the flag on a finish, a request for input and a bell; never on a prompt', () => {
+    const h = unwatched()
+    hook(h.server, 'working')
+    expect(h.meta.get(WT)?.isUnread).toBeUndefined()
+
+    advance(20_000)
+    hook(h.server, 'done')
+    expect(h.meta.get(WT)?.isUnread).toBe(true)
+    // The stamps and the flag are one change to the record.
+    expect(h.notified).toEqual([WT, WT])
+
+    for (const news of [() => hook(h.server, 'blocked'), () => h.sideEffects([{ kind: 'bell' }])]) {
+      h.meta.set(WT, { ...h.meta.get(WT)!, isUnread: false })
+      hook(h.server, 'working')
+      news()
+      expect(h.meta.get(WT)?.isUnread).toBe(true)
+    }
+
+    // A flag already up is not written again.
+    const writes = h.writes.length
+    h.sideEffects([{ kind: 'bell' }])
+    expect(h.writes).toHaveLength(writes)
+  })
+
+  it('leaves the flag down where someone is looking: the pane’s tab, or a bell’s workspace', () => {
+    const h = unwatched()
+    const seen: [string, string | null][] = []
+    h.viewing.isViewing = (id, pane) => {
+      seen.push([id, pane])
+      return pane === PANE
+    }
+    hook(h.server, 'working')
+    advance(20_000)
+    hook(h.server, 'done')
+    expect(h.meta.get(WT)?.isUnread).toBeUndefined()
+
+    h.sideEffects([{ kind: 'bell' }])
+    expect(h.meta.get(WT)?.isUnread).toBe(true)
+    expect(seen).toEqual([
+      [WT, PANE],
+      [WT, TITLE_PANE]
+    ])
+  })
+
+  it('raises an SSH workspace’s flag on its own host’s record, and a folder’s on the folder', () => {
+    const h = unwatched()
+    h.sideEffects([{ kind: 'bell' }], { connectionId: 'build-box' })
+    expect(h.sshMeta.get(WT)?.isUnread).toBe(true)
+    expect(h.meta.get(WT)?.isUnread).toBeUndefined()
+
+    h.server.ingestTerminalStatus({
+      paneKey: PANE,
+      tabId: 'tab-a',
+      worktreeId: FOLDER,
+      payload: { state: 'waiting', prompt: 'task', agentType: 'codex' }
+    })
+    expect(h.folders.get(FOLDER_ID)?.isUnread).toBe(true)
+  })
+
+  it('raises nothing for a restored status, a frozen project or a workspace with no record', () => {
+    const h = createHarness()
+    h.viewing.isViewing = () => false
+    hook(h.server, 'blocked')
+    h.producer.attachAgentStatusStore(h.server)
+    expect(h.meta.get(WT)?.isUnread).toBeUndefined()
+
+    h.fenced.add(WT)
+    h.sideEffects([{ kind: 'bell' }])
+    expect(h.meta.get(WT)?.isUnread).toBeUndefined()
+
+    hook(h.server, 'done', 'repo-1::/tmp/gone')
+    expect(h.writes).not.toContain('repo-1::/tmp/gone')
+  })
+})
diff --git a/src/main/runtime/sidebar-inputs/sort-stamps-producer.ts b/src/main/runtime/sidebar-inputs/sort-stamps-producer.ts
index fe42bd79ea9..0b8b0cc4709 100644
--- a/src/main/runtime/sidebar-inputs/sort-stamps-producer.ts
+++ b/src/main/runtime/sidebar-inputs/sort-stamps-producer.ts
@@ -10,6 +10,7 @@ import type { RuntimeClientEvent } from '../../../shared/runtime-client-events'
 import {
   classifySortStampEvent,
   hookRowAgentPhase,
+  isUnreadNews,
   nextAgentPaneState,
   REST_PANE,
   titleAgentPhase,
@@ -23,6 +24,7 @@ import {
   listTieredWorkspaces,
   readSortStamps,
   writeSortStamps,
+  writeUnreadFlag,
   type SortStampsStore,
   type WorkspaceRef
 } from './sort-stamp-records'
@@ -50,7 +52,9 @@ export type SortStampsSources = {
     listener: (event: RuntimeClientEvent) => void,
     options: { consumesTerminalSideEffects: true }
   ) => () => void
-  /** A record's stamps changed; clients re-list it. */
+  /** Whether a client is looking at the workspace, or at the pane's tab. */
+  isViewing: (worktreeId: string, paneKey: string | null) => boolean
+  /** A record's stamps or unread flag changed; clients re-list it. */
   onStampsWritten: (worktreeId: string) => void
   now: () => number
 }
@@ -70,7 +74,8 @@ function sameWorkspace(a: WorkspaceRef | undefined, b: WorkspaceRef | null): boo
 /**
  * Writes the sort stamps of every workspace this host owns, at the source: hook-store transitions
  * (terminal agents and structured chats), hookless agents' titles, bells, and terminals a CLI
- * starts. Creation stamps itself where the record is made. Rest panes are not kept.
+ * starts. Creation stamps itself where the record is made. Rest panes are not kept. The same news
+ * raises the workspace's unread flag unless a client is looking at it; clients clear it.
  */
 export class SortStampsProducer {
   private readonly panes = new Map<string, TrackedPane>()
@@ -203,7 +208,7 @@ export class SortStampsProducer {
     const workspace = { worktreeId, sshHostId: sshHostOfConnection(batch.connectionId) }
     for (const fact of batch.facts) {
       if (fact.kind === 'bell') {
-        this.stamp(workspace, { kind: 'bell' })
+        this.stamp(workspace, { kind: 'bell' }, this.sources.now(), paneKey ?? null)
       } else if (fact.kind === 'title' && paneKey && !this.latestHookRow(paneKey)) {
         // Hook authority is per pane, as in Smart's attention. A cleared stale working title is a
         // timer's guess, not a finish.
@@ -309,14 +314,15 @@ export class SortStampsProducer {
     } else {
       this.panes.set(paneKey, { ...workspace, state })
     }
-    this.writeAgentChange(workspace, before.phase, state.phase, at)
+    this.writeAgentChange(workspace, before.phase, state.phase, at, paneKey)
   }
 
   private writeAgentChange(
     workspace: WorkspaceRef,
     from: AgentPhase,
     to: AgentPhase,
-    now: number
+    now: number,
+    paneKey: string | null = null
   ): void {
     const panes: AgentPaneState[] = []
     for (const pane of this.panes.values()) {
@@ -324,11 +330,16 @@ export class SortStampsProducer {
         panes.push(pane.state)
       }
     }
-    this.stamp(workspace, { kind: 'agent', from, to, panes }, now)
+    this.stamp(workspace, { kind: 'agent', from, to, panes }, now, paneKey)
   }
 
   // One clock read per event, so a pane's time and its Recent stamp agree.
-  private stamp(workspace: WorkspaceRef, event: SortStampEvent, now = this.sources.now()): void {
+  private stamp(
+    workspace: WorkspaceRef,
+    event: SortStampEvent,
+    now = this.sources.now(),
+    paneKey: string | null = null
+  ): void {
     // A WSL move only takes this machine's projects.
     if (!workspace.sshHostId && this.sources.isWriteFenced(workspace.worktreeId)) {
       return
@@ -337,6 +348,12 @@ export class SortStampsProducer {
     const next = current && classifySortStampEvent(current, event, now)
     if (next) {
       writeSortStamps(this.sources.store(), workspace, next)
+    }
+    const raised =
+      isUnreadNews(event) &&
+      !this.sources.isViewing(workspace.worktreeId, paneKey) &&
+      writeUnreadFlag(this.sources.store(), workspace, true)
+    if (next || raised) {
       this.sources.onStampsWritten(workspace.worktreeId)
     }
   }
diff --git a/src/main/runtime/sidebar-inputs/workspace-viewers.test.ts b/src/main/runtime/sidebar-inputs/workspace-viewers.test.ts
new file mode 100644
index 00000000000..f8776f282d0
--- /dev/null
+++ b/src/main/runtime/sidebar-inputs/workspace-viewers.test.ts
@@ -0,0 +1,53 @@
+import { describe, expect, it } from 'vitest'
+import { WorkspaceViewers } from './workspace-viewers'
+
+const WT = 'repo-1::/tmp/a'
+const PANE = 'tab-a:22222222-2222-4222-8222-222222222222'
+const OTHER_PANE = 'tab-b:33333333-3333-4333-8333-333333333333'
+
+function viewers() {
+  const clock = { now: 1_000 }
+  return { clock, viewers: new WorkspaceViewers(() => clock.now) }
+}
+
+describe('WorkspaceViewers', () => {
+  it('sees a pane whose tab a client shows, and a workspace only for news with no pane', () => {
+    const { viewers: v } = viewers()
+    expect(
+      v.reportClientView('c1', { workspaceIds: [WT], tabIds: ['tab-a'], presentForMs: null })
+    ).toBe(true)
+    expect(v.isViewing(WT, PANE)).toBe(true)
+    expect(v.isViewing(WT, OTHER_PANE)).toBe(false)
+    expect(v.isViewing(WT, null)).toBe(true)
+    expect(v.isViewing('repo-1::/tmp/b', null)).toBe(false)
+    // A later report replaces the view and needs no second tie to the connection.
+    expect(v.reportClientView('c1', { workspaceIds: [], tabIds: [], presentForMs: null })).toBe(
+      false
+    )
+    expect(v.isViewing(WT, PANE)).toBe(false)
+  })
+
+  it('stops seeing once the user’s presence lapses or the client goes', () => {
+    const { clock, viewers: v } = viewers()
+    v.reportClientView('c1', { workspaceIds: [WT], tabIds: ['tab-a'], presentForMs: 500 })
+    expect(v.isViewing(WT, PANE)).toBe(true)
+    clock.now += 500
+    expect(v.isViewing(WT, PANE)).toBe(false)
+
+    v.reportClientView('c1', { workspaceIds: [WT], tabIds: ['tab-a'], presentForMs: null })
+    v.dropClient('c1')
+    expect(v.isViewing(WT, PANE)).toBe(false)
+  })
+
+  it('sees every pane of a workspace a phone holds open, by any spelling of its path', () => {
+    const { viewers: v } = viewers()
+    const first = v.openPhoneSession('repo-1::/tmp/a/')
+    const second = v.openPhoneSession(WT)
+    expect(v.isViewing(WT, OTHER_PANE)).toBe(true)
+    first()
+    first()
+    expect(v.isViewing(WT, PANE)).toBe(true)
+    second()
+    expect(v.isViewing(WT, PANE)).toBe(false)
+  })
+})
diff --git a/src/main/runtime/sidebar-inputs/workspace-viewers.ts b/src/main/runtime/sidebar-inputs/workspace-viewers.ts
new file mode 100644
index 00000000000..5cc7389355b
--- /dev/null
+++ b/src/main/runtime/sidebar-inputs/workspace-viewers.ts
@@ -0,0 +1,71 @@
+import { parsePaneKey } from '../../../shared/stable-pane-id'
+import { worktreeIdentityKey } from '../../../shared/worktree/id'
+import type { ClientWorkspaceView } from '../../../shared/rpc-contract/client-workspace-view-params'
+
+type ClientView = { workspaceKeys: Set<string>; tabIds: Set<string>; presentUntil: number }
+
+/**
+ * Who is looking at this host's workspaces: client windows by what they report on screen, and
+ * phones by the session they hold open. The host's unread flag skips what someone is looking at.
+ * Workspaces are keyed by identity, so path spellings of one checkout match.
+ */
+export class WorkspaceViewers {
+  private readonly clients = new Map<string, ClientView>()
+  private readonly phoneSessions = new Map<string, number>()
+
+  constructor(private readonly now: () => number) {}
+
+  /** Replaces the client's view; true the first time, so the caller ties it to the connection. */
+  reportClientView(clientKey: string, view: ClientWorkspaceView): boolean {
+    const known = this.clients.has(clientKey)
+    this.clients.set(clientKey, {
+      workspaceKeys: new Set(view.workspaceIds.map(worktreeIdentityKey)),
+      tabIds: new Set(view.tabIds),
+      presentUntil:
+        view.presentForMs === null ? Number.POSITIVE_INFINITY : this.now() + view.presentForMs
+    })
+    return !known
+  }
+
+  dropClient(clientKey: string): void {
+    this.clients.delete(clientKey)
+  }
+
+  /** A phone's open session on the workspace, until the returned release. */
+  openPhoneSession(worktreeId: string): () => void {
+    const key = worktreeIdentityKey(worktreeId)
+    this.phoneSessions.set(key, (this.phoneSessions.get(key) ?? 0) + 1)
+    let open = true
+    return () => {
+      if (!open) {
+        return
+      }
+      open = false
+      const remaining = (this.phoneSessions.get(key) ?? 1) - 1
+      if (remaining > 0) {
+        this.phoneSessions.set(key, remaining)
+      } else {
+        this.phoneSessions.delete(key)
+      }
+    }
+  }
+
+  /** As the window's own rule: a pane is seen when its tab is on screen, else the workspace. */
+  isViewing(worktreeId: string, paneKey: string | null): boolean {
+    const key = worktreeIdentityKey(worktreeId)
+    if (this.phoneSessions.has(key)) {
+      return true
+    }
+    const tabId = paneKey === null ? null : (parsePaneKey(paneKey)?.tabId ?? null)
+    const now = this.now()
+    for (const view of this.clients.values()) {
+      if (
+        now < view.presentUntil &&
+        (tabId === null ? view.workspaceKeys.has(key) : view.tabIds.has(tabId))
+      ) {
+        return true
+      }
+    }
+    return false
+  }
+}
diff --git a/src/renderer/src/components/tab-bar/TabSessionSurfaceSwitchMenuItems.test.tsx b/src/renderer/src/components/tab-bar/TabSessionSurfaceSwitchMenuItems.test.tsx
index 700bd5bbeef..4a94b3a59c0 100644
--- a/src/renderer/src/components/tab-bar/TabSessionSurfaceSwitchMenuItems.test.tsx
+++ b/src/renderer/src/components/tab-bar/TabSessionSurfaceSwitchMenuItems.test.tsx
@@ -71,7 +71,9 @@ beforeEach(() => {
   mocks.listSessions.mockReset()
   mocks.listSessions.mockReturnValue(new Promise(() => {}))
   Object.assign(window, {
-    api: { aiVault: { listSessions: mocks.listSessions, cancelListSessions: vi.fn(async () => {}) } }
+    api: {
+      aiVault: { listSessions: mocks.listSessions, cancelListSessions: vi.fn(async () => {}) }
+    }
   })
 })
 
diff --git a/src/renderer/src/hooks/agent-auto-ack-presence.ts b/src/renderer/src/hooks/agent-auto-ack-presence.ts
index 220afb462a6..a47ed4dcf27 100644
--- a/src/renderer/src/hooks/agent-auto-ack-presence.ts
+++ b/src/renderer/src/hooks/agent-auto-ack-presence.ts
@@ -22,6 +22,13 @@ export function isPresenceConfirmed(): boolean {
   return !presenceGated || Date.now() - presentAt < DESKTOP_AWAY_SECONDS * 1000
 }
 
+/** How long presence holds without new input; null where it is not gated (browsers). */
+export function presenceRemainingMs(): number | null {
+  return presenceGated
+    ? Math.max(0, Math.round(DESKTOP_AWAY_SECONDS * 1000 - (Date.now() - presentAt)))
+    : null
+}
+
 export function createAutoAckPresenceCheck(
   readAway: () => Promise<boolean | undefined>,
   onPresent: () => void
diff --git a/src/renderer/src/hooks/client-workspace-view-report.test.ts b/src/renderer/src/hooks/client-workspace-view-report.test.ts
new file mode 100644
index 00000000000..799808ea67a
--- /dev/null
+++ b/src/renderer/src/hooks/client-workspace-view-report.test.ts
@@ -0,0 +1,146 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import type { AppState } from '@/store/types'
+import type { RuntimeClientTarget } from '../../../shared/runtime-client-target'
+import type { ClientWorkspaceView } from '../../../shared/rpc-contract/client-workspace-view-params'
+
+const presence = vi.hoisted((): { remaining: number | null } => ({ remaining: 180_000 }))
+
+vi.mock('./agent-auto-ack-presence', () => ({ presenceRemainingMs: () => presence.remaining }))
+vi.mock('@/runtime/runtime-rpc-client', () => ({ callRuntimeRpc: vi.fn() }))
+vi.mock('@/store/slices/workspace-attention/workspace-unread-flag', () => ({
+  onScreenHostId: () => null
+}))
+vi.mock('@/store/slices/worktrees/listing/worktree-owner-target', () => ({
+  // `server:` workspaces belong to a paired server; the rest to this app.
+  tryRuntimeTargetForWorktreeOwner: (_state: unknown, workspaceId: string) =>
+    workspaceId.startsWith('server:')
+      ? { kind: 'environment', environmentId: 'env-1' }
+      : workspaceId === 'unowned'
+        ? null
+        : { kind: 'local' }
+}))
+
+const { createClientWorkspaceViewReporter } = await import('./client-workspace-view-report')
+
+// oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: owner lookup is mocked above, so no state is read.
+const STATE = {} as AppState
+
+function reporter() {
+  const sent: { target: RuntimeClientTarget; view: ClientWorkspaceView }[] = []
+  const report = createClientWorkspaceViewReporter(async (target, view) => {
+    sent.push({ target, view })
+  })
+  return { sent, report }
+}
+
+beforeEach(() => {
+  vi.useFakeTimers({ now: 1_000_000, toFake: ['Date'] })
+  presence.remaining = 180_000
+})
+
+afterEach(() => {
+  vi.useRealTimers()
+})
+
+describe('createClientWorkspaceViewReporter', () => {
+  it('sends each owning host only its own workspaces and tabs, and only when they change', () => {
+    const { sent, report } = reporter()
+    const targets = [
+      { tabId: 'tab-a', worktreeId: 'local-wt', surfaceKind: 'terminal' as const },
+      { tabId: 'tab-s', worktreeId: 'server:wt', surfaceKind: 'structured' as const },
+      { tabId: 'tab-x', worktreeId: null, surfaceKind: 'terminal' as const }
+    ]
+    report.update(STATE, ['local-wt', 'server:wt', 'unowned'], targets)
+    expect(sent).toEqual([
+      {
+        target: { kind: 'local' },
+        view: { workspaceIds: ['local-wt'], tabIds: ['tab-a'], presentForMs: 190_000 }
+      },
+      {
+        target: { kind: 'environment', environmentId: 'env-1' },
+        view: { workspaceIds: ['server:wt'], tabIds: ['tab-s'], presentForMs: 190_000 }
+      }
+    ])
+    report.update(STATE, ['local-wt', 'server:wt', 'unowned'], targets)
+    expect(sent).toHaveLength(2)
+
+    // The server's workspace left the screen: it hears an empty view, once.
+    report.update(STATE, ['local-wt'], targets.slice(0, 1))
+    report.update(STATE, ['local-wt'], targets.slice(0, 1))
+    expect(sent.slice(2)).toEqual([
+      {
+        target: { kind: 'environment', environmentId: 'env-1' },
+        view: { workspaceIds: [], tabIds: [], presentForMs: 190_000 }
+      }
+    ])
+  })
+
+  it('refreshes the host’s copy at most every ten seconds of activity', () => {
+    const { sent, report } = reporter()
+    report.update(STATE, ['local-wt'], [])
+    vi.setSystemTime(Date.now() + 9_000)
+    report.renewPresence()
+    expect(sent).toHaveLength(1)
+
+    vi.setSystemTime(Date.now() + 1_000)
+    report.renewPresence()
+    expect(sent).toHaveLength(2)
+    expect(sent[1].view.presentForMs).toBe(190_000)
+  })
+
+  it('reports an away user’s screen with no presence, and renews as soon as input returns', () => {
+    const { sent, report } = reporter()
+    presence.remaining = 0
+    report.update(STATE, ['local-wt'], [])
+    expect(sent[0].view.presentForMs).toBe(0)
+    report.renewPresence()
+    expect(sent).toHaveLength(1)
+    presence.remaining = 180_000
+    report.renewPresence()
+    expect(sent).toHaveLength(2)
+  })
+
+  it('refreshes where presence is not tracked too, so a reconnected host learns the view', () => {
+    const { sent, report } = reporter()
+    presence.remaining = null
+    report.update(STATE, ['local-wt'], [])
+    vi.setSystemTime(Date.now() + 10_000)
+    report.renewPresence()
+    expect(sent).toHaveLength(2)
+    expect(sent[1].view.presentForMs).toBeNull()
+  })
+
+  it('retries a failed send, empty or not, no sooner than a refresh', async () => {
+    const sent: ClientWorkspaceView[] = []
+    let fail = true
+    const report = createClientWorkspaceViewReporter(async (_target, view) => {
+      sent.push(view)
+      if (fail) {
+        throw new Error('method_not_found')
+      }
+    })
+    report.update(STATE, ['local-wt'], [])
+    await Promise.resolve()
+    report.renewPresence()
+    expect(sent).toHaveLength(1)
+    vi.setSystemTime(Date.now() + 10_000)
+    report.renewPresence()
+    expect(sent).toHaveLength(2)
+
+    fail = false
+    vi.setSystemTime(Date.now() + 10_000)
+    report.renewPresence()
+    await Promise.resolve()
+    expect(sent).toHaveLength(3)
+
+    // The workspace left the screen and the empty view failed: it is resent too.
+    fail = true
+    report.update(STATE, [], [])
+    await Promise.resolve()
+    fail = false
+    vi.setSystemTime(Date.now() + 10_000)
+    report.renewPresence()
+    expect(sent).toHaveLength(5)
+    expect(sent.at(-1)?.workspaceIds).toEqual([])
+  })
+})
diff --git a/src/renderer/src/hooks/client-workspace-view-report.ts b/src/renderer/src/hooks/client-workspace-view-report.ts
new file mode 100644
index 00000000000..1d70ceb5f89
--- /dev/null
+++ b/src/renderer/src/hooks/client-workspace-view-report.ts
@@ -0,0 +1,146 @@
+import type { AppState } from '@/store/types'
+import type { RuntimeClientTarget } from '../../../shared/runtime-client-target'
+import type { ClientWorkspaceView } from '../../../shared/rpc-contract/client-workspace-view-params'
+import { callRuntimeRpc } from '@/runtime/runtime-rpc-client'
+import { tryRuntimeTargetForWorktreeOwner } from '@/store/slices/worktrees/listing/worktree-owner-target'
+import { onScreenHostId } from '@/store/slices/workspace-attention/workspace-unread-flag'
+import { presenceRemainingMs, subscribeAutoAckPresenceSignals } from './agent-auto-ack-presence'
+import type { AutoAckTabTarget } from './agent-auto-ack-targets'
+
+// While the user is active, a host's copy of the view is resent this often: its presence trails the
+// window's by at most this, and a host that lost the connection (and so the view) learns it again.
+const REFRESH_MS = 10_000
+
+type HostView = {
+  target: RuntimeClientTarget
+  workspaceIds: string[]
+  tabIds: string[]
+  signature: string
+}
+/** `signature` null: the send failed, and is retried once REFRESH_MS has passed. */
+type SentView = {
+  target: RuntimeClientTarget
+  signature: string | null
+  sentAt: number
+  present: boolean
+}
+
+export type ClientWorkspaceViewReporter = {
+  /** The scan's screen: its workspaces and tabs, empty while the window is hidden or unfocused. */
+  update: (
+    state: AppState,
+    workspaceIds: readonly string[],
+    targets: readonly AutoAckTabTarget[]
+  ) => void
+  /** Trusted input arrived. */
+  renewPresence: () => void
+}
+
+function targetKey(target: RuntimeClientTarget): string {
+  return target.kind === 'local' ? 'local' : `environment:${target.environmentId}`
+}
+
+/**
+ * Tells each host that owns an on-screen workspace what this window shows of it, so the host
+ * raises no unread flag there. A host whose workspaces left the screen is sent an empty view.
+ */
+export function createClientWorkspaceViewReporter(
+  send: (target: RuntimeClientTarget, view: ClientWorkspaceView) => Promise<unknown> = (
+    target,
+    view
+  ) => callRuntimeRpc(target, 'sidebarInputs.reportView', view)
+): ClientWorkspaceViewReporter {
+  let views = new Map<string, HostView>()
+  const sent = new Map<string, SentView>()
+
+  const flush = (): void => {
+    const now = Date.now()
+    const presentForMs = presenceRemainingMs()
+    const present = presentForMs !== 0
+    for (const key of new Set([...sent.keys(), ...views.keys()])) {
+      const view = views.get(key)
+      const previous = sent.get(key)
+      const target = view?.target ?? previous?.target
+      const failed = previous?.signature === null
+      if (!target || (failed && now - previous.sentAt < REFRESH_MS)) {
+        continue
+      }
+      const refreshes =
+        view !== undefined &&
+        previous !== undefined &&
+        present &&
+        (!previous.present || now - previous.sentAt >= REFRESH_MS)
+      if (!failed && previous?.signature === view?.signature && !refreshes) {
+        continue
+      }
+      const entry = view && { target, signature: view.signature, sentAt: now, present }
+      if (entry) {
+        sent.set(key, entry)
+      } else {
+        sent.delete(key)
+      }
+      // An older host has no reportView; a failed send, empty or not, is retried no sooner than
+      // REFRESH_MS, so input never turns into a stream of doomed calls.
+      void send(target, {
+        workspaceIds: view?.workspaceIds ?? [],
+        tabIds: view?.tabIds ?? [],
+        // Held one refresh longer than the window's, so the host never drops a present user first.
+        presentForMs: presentForMs ? presentForMs + REFRESH_MS : presentForMs
+      }).catch(() => {
+        if (sent.get(key) === entry) {
+          sent.set(key, { target, signature: null, sentAt: now, present })
+        }
+      })
+    }
+  }
+
+  return {
+    update: (state, workspaceIds, targets) => {
+      const next = new Map<string, HostView>()
+      const hostView = (workspaceId: string): HostView | null => {
+        const target = tryRuntimeTargetForWorktreeOwner(
+          state,
+          workspaceId,
+          onScreenHostId(state, workspaceId) ?? undefined
+        )
+        if (!target) {
+          return null
+        }
+        const key = targetKey(target)
+        let view = next.get(key)
+        if (!view) {
+          view = { target, workspaceIds: [], tabIds: [], signature: '' }
+          next.set(key, view)
+        }
+        return view
+      }
+      for (const workspaceId of workspaceIds) {
+        hostView(workspaceId)?.workspaceIds.push(workspaceId)
+      }
+      for (const target of targets) {
+        if (target.worktreeId !== null) {
+          hostView(target.worktreeId)?.tabIds.push(target.tabId)
+        }
+      }
+      for (const view of next.values()) {
+        view.signature = JSON.stringify([view.workspaceIds, view.tabIds])
+      }
+      views = next
+      flush()
+    },
+    renewPresence: flush
+  }
+}
+
+/** The scan's presence signals plus blur: a window still visible but behind another app shows nothing. */
+export function subscribeViewReportPresenceSignals(
+  onRescan: () => void,
+  onInput: () => void
+): () => void {
+  const stop = subscribeAutoAckPresenceSignals(onRescan, onInput)
+  window.addEventListener('blur', onRescan)
+  return () => {
+    stop()
+    window.removeEventListener('blur', onRescan)
+  }
+}
diff --git a/src/renderer/src/hooks/on-screen-attention-scan.ts b/src/renderer/src/hooks/on-screen-attention-scan.ts
index 096c67cc2d0..72111579c9e 100644
--- a/src/renderer/src/hooks/on-screen-attention-scan.ts
+++ b/src/renderer/src/hooks/on-screen-attention-scan.ts
@@ -32,6 +32,7 @@ import {
 } from '@/store/slices/workspace-attention/workspace-unread-flag'
 import { paneKeyTabId } from '@/store/slices/workspace-attention/workspace-live-markers'
 import { isOrcaWindowForegroundFocused } from '@/components/terminal-pane/terminal-notification-pane-visibility'
+import type { ClientWorkspaceViewReporter } from './client-workspace-view-report'
 
 type ScanStore = {
   getState: () => AppState
@@ -48,6 +49,8 @@ export type OnScreenAttentionEnvironment = {
   subscribeStructuredViews: (onView: (view: StructuredSubjectRead) => void) => () => void
   /** `onRescan`: visibility/focus changed. `onInput`: trusted input proves presence. */
   subscribePresenceSignals: (onRescan: () => void, onInput: () => void) => () => void
+  /** Where the owning hosts raise the unread flag, they learn what this window shows. */
+  viewReporter?: ClientWorkspaceViewReporter
 }
 
 function hasMarkersOnScreen(s: AppState, targets: readonly AutoAckTabTarget[]): boolean {
@@ -151,12 +154,13 @@ export function startOnScreenAttentionScan(
 
     // Why: tab-active only proxies "seen"; gate on window visible+focused so away-time transitions don't silently clear the bold signal.
     const workspaceIds = isOrcaWindowForegroundFocused() ? onScreenWorkspaceIds(s) : []
+    // An editor, browser or empty workspace has no targets but still reads its flag on arrival.
+    const targets = workspaceIds.length === 0 ? [] : resolveAutoAckTabTargets(s)
+    env.viewReporter?.update(s, workspaceIds, targets)
     if (workspaceIds.length === 0) {
       lastReadScreenKey = null
       return
     }
-    // An editor, browser or empty workspace has no targets but still reads its flag on arrival.
-    const targets = resolveAutoAckTabTargets(s)
     const screenKey = [
       s.activeWorkspaceExecutionHostId,
       ...workspaceIds,
@@ -250,6 +254,7 @@ export function startOnScreenAttentionScan(
     () => maybeAck({ force: true }),
     () => {
       notePresence()
+      env.viewReporter?.renewPresence()
       // Why only while a presence check is parked: input is the hottest path in the app, and an
       // unparked rescan would only re-read the screen that store writes and views already read.
       if (pendingPresenceReads !== undefined) {
diff --git a/src/renderer/src/hooks/useReadOnScreenAttention.ts b/src/renderer/src/hooks/useReadOnScreenAttention.ts
index 15662f9157d..27cff0c942f 100644
--- a/src/renderer/src/hooks/useReadOnScreenAttention.ts
+++ b/src/renderer/src/hooks/useReadOnScreenAttention.ts
@@ -4,6 +4,11 @@ import { subscribeAutoAckPresenceSignals } from './agent-auto-ack-presence'
 import { useAppStore } from '@/store'
 import { isWebClientLocation } from '@/lib/web-client-location'
 import { startOnScreenAttentionScan } from './on-screen-attention-scan'
+import { ORCA_SIDEBAR_INPUTS_IS_MAIN } from '../../../shared/sidebar-inputs-switch'
+import {
+  createClientWorkspaceViewReporter,
+  subscribeViewReportPresenceSignals
+} from './client-workspace-view-report'
 
 /** Reads what is on screen: acknowledges the visible agents and reads the visible tabs' markers. */
 export function useReadOnScreenAttention(): void {
@@ -14,7 +19,13 @@ export function useReadOnScreenAttention(): void {
           ? null
           : async () => window.api?.notifications?.getDesktopAwayState?.(),
         subscribeStructuredViews: subscribeStructuredAttentionViews,
-        subscribePresenceSignals: subscribeAutoAckPresenceSignals
+        // Switch point: the owning hosts raise the unread flag, so they learn what is on screen.
+        ...(ORCA_SIDEBAR_INPUTS_IS_MAIN
+          ? {
+              subscribePresenceSignals: subscribeViewReportPresenceSignals,
+              viewReporter: createClientWorkspaceViewReporter()
+            }
+          : { subscribePresenceSignals: subscribeAutoAckPresenceSignals })
       }),
     []
   )
diff --git a/src/renderer/src/lib/sidebar-shadow/window-unread-decisions.ts b/src/renderer/src/lib/sidebar-shadow/window-unread-decisions.ts
new file mode 100644
index 00000000000..d44da9ffe1e
--- /dev/null
+++ b/src/renderer/src/lib/sidebar-shadow/window-unread-decisions.ts
@@ -0,0 +1,7 @@
+// What the window's own unread rule decided per workspace. With the switch on the window writes no
+// flag; its decisions are kept here only for the workspace-unread shadow to compare.
+export const windowUnreadDecisions = new Map<string, boolean>()
+
+export function noteWindowUnreadDecision(workspaceId: string, isUnread: boolean): void {
+  windowUnreadDecisions.set(workspaceId, isUnread)
+}
diff --git a/src/renderer/src/lib/sidebar-shadow/workspace-unread-shadow.ts b/src/renderer/src/lib/sidebar-shadow/workspace-unread-shadow.ts
new file mode 100644
index 00000000000..5e4b0f4036c
--- /dev/null
+++ b/src/renderer/src/lib/sidebar-shadow/workspace-unread-shadow.ts
@@ -0,0 +1,62 @@
+import { useAppStore } from '@/store'
+import type { AppState } from '@/store/types'
+import { folderWorkspaceKey } from '../../../../shared/workspace-scope'
+import { defineSidebarShadowDomain } from './sidebar-shadow-comparison'
+import { windowUnreadDecisions as windowDecisions } from './window-unread-decisions'
+
+// The workspace unread flag: what the window's own rule decided, next to the flag the owning host
+// holds (the records this store lists). Only flags either side moved since the check first saw the
+// workspace are compared, so flags restored at startup are no one's decision. A clear from any
+// client (a phone opening it, a read on another window) reaches every window, so it resets this
+// window's decision too; only a raise is the host's call.
+
+function storeFlags(state: AppState): Map<string, boolean> {
+  const flags = new Map<string, boolean>()
+  for (const worktrees of Object.values(state.worktreesByRepo)) {
+    for (const worktree of worktrees) {
+      flags.set(worktree.id, worktree.isUnread)
+    }
+  }
+  for (const folder of state.folderWorkspaces) {
+    const key = folderWorkspaceKey(folder.id)
+    flags.set(key, (flags.get(key) ?? false) || folder.isUnread)
+  }
+  return flags
+}
+
+const firstSeen = new Map<string, boolean>()
+const lastSeen = new Map<string, boolean>()
+
+export const workspaceUnreadShadow = defineSidebarShadowDomain<boolean>({
+  name: 'workspace-unread',
+  readMain: async () => {
+    const current = storeFlags(useAppStore.getState())
+    for (const [workspaceId, flag] of current) {
+      if (!firstSeen.has(workspaceId)) {
+        firstSeen.set(workspaceId, flag)
+      }
+      if (lastSeen.get(workspaceId) === true && !flag) {
+        windowDecisions.set(workspaceId, false)
+      }
+      lastSeen.set(workspaceId, flag)
+    }
+    const values = new Map<string, boolean>()
+    for (const [workspaceId, flag] of current) {
+      if (windowDecisions.has(workspaceId) || firstSeen.get(workspaceId) !== flag) {
+        values.set(workspaceId, flag)
+      }
+    }
+    return { values }
+  },
+  readWindow: (main) => {
+    const values = new Map<string, boolean>()
+    for (const workspaceId of main.values.keys()) {
+      values.set(
+        workspaceId,
+        windowDecisions.get(workspaceId) ?? firstSeen.get(workspaceId) ?? false
+      )
+    }
+    return values
+  },
+  equals: (window, main) => (window ?? false) === (main ?? false)
+})
diff --git a/src/renderer/src/main.tsx b/src/renderer/src/main.tsx
index 68c316addbf..ee796988f57 100644
--- a/src/renderer/src/main.tsx
+++ b/src/renderer/src/main.tsx
@@ -37,6 +37,7 @@ import { workspaceReviewShadow } from './lib/sidebar-shadow/workspace-review-sha
 import { sidebarTemporalShadow } from './lib/sidebar-shadow/sidebar-temporal-shadow'
 import { workspaceCreationsShadow } from './lib/sidebar-shadow/workspace-creations-shadow'
 import { workspaceRowsShadow } from './lib/sidebar-shadow/workspace-rows-shadow'
+import { workspaceUnreadShadow } from './lib/sidebar-shadow/workspace-unread-shadow'
 
 const disposeOsFileDropGuard = installOsFileDropCancellationGuard()
 import.meta.hot?.dispose(disposeOsFileDropGuard)
@@ -54,7 +55,8 @@ if (ORCA_SIDEBAR_INPUTS_IS_MAIN) {
     workspaceReviewShadow,
     sidebarTemporalShadow,
     workspaceCreationsShadow,
-    workspaceRowsShadow
+    workspaceRowsShadow,
+    workspaceUnreadShadow
   ])
   import.meta.hot?.dispose(disposeSidebarShadow)
 }
diff --git a/src/renderer/src/store/slices/workspace-attention/workspace-attention-slice.ts b/src/renderer/src/store/slices/workspace-attention/workspace-attention-slice.ts
index 3ef999e41d1..e2bb95f83c1 100644
--- a/src/renderer/src/store/slices/workspace-attention/workspace-attention-slice.ts
+++ b/src/renderer/src/store/slices/workspace-attention/workspace-attention-slice.ts
@@ -16,6 +16,8 @@ import {
 import { workspaceMarkerTabIds } from './workspace-live-markers'
 import { isTabOnScreen } from '@/hooks/agent-auto-ack-targets'
 import { isWorkspaceNotificationMutedBySidebarFilters } from '@/attention/hidden-workspace-notification-mute'
+import { ORCA_SIDEBAR_INPUTS_IS_MAIN } from '../../../../../shared/sidebar-inputs-switch'
+import { noteWindowUnreadDecision } from '@/lib/sidebar-shadow/window-unread-decisions'
 
 export const createWorkspaceAttentionSlice: StateCreator<
   AppState,
@@ -118,6 +120,9 @@ export const createWorkspaceAttentionSlice: StateCreator<
       }
     },
     setWorkspaceUnreadByUser: (worktreeId, isUnread, executionHostId) => {
+      if (ORCA_SIDEBAR_INPUTS_IS_MAIN) {
+        noteWindowUnreadDecision(worktreeId, isUnread)
+      }
       if (!isUnread) {
         removeAndDismiss(workspaceMarkerTabIds(get(), worktreeId))
       }
diff --git a/src/renderer/src/store/slices/workspace-attention/workspace-unread-flag.ts b/src/renderer/src/store/slices/workspace-attention/workspace-unread-flag.ts
index 14ab0850a8c..a2dcd715fa9 100644
--- a/src/renderer/src/store/slices/workspace-attention/workspace-unread-flag.ts
+++ b/src/renderer/src/store/slices/workspace-attention/workspace-unread-flag.ts
@@ -12,6 +12,7 @@ import { persistPassiveWorktreeMetaForOwner } from '../worktrees/listing/worktre
 import type { WorkspaceAttentionGet, WorkspaceAttentionSet } from './workspace-attention-contract'
 import { workspaceHasLiveMarker } from './workspace-live-markers'
 import { ORCA_SIDEBAR_INPUTS_IS_MAIN } from '../../../../../shared/sidebar-inputs-switch'
+import { noteWindowUnreadDecision } from '@/lib/sidebar-shadow/window-unread-decisions'
 
 // The persisted workspace flag `isUnread`. Only the workspace-attention module writes it.
 
@@ -20,8 +21,12 @@ export function markWorkspaceUnreadFlag(
   get: WorkspaceAttentionGet,
   worktreeId: string
 ): void {
-  // Switch point: the owning host stamps bells and finishes; the flag alone is the window's.
-  const stamp = ORCA_SIDEBAR_INPUTS_IS_MAIN ? {} : { lastActivityAt: Date.now() }
+  // Switch point: the owning host raises the flag from the same news; the window only records it.
+  if (ORCA_SIDEBAR_INPUTS_IS_MAIN) {
+    noteWindowUnreadDecision(worktreeId, true)
+    return
+  }
+  const stamp = { lastActivityAt: Date.now() }
   const workspaceScope = parseWorkspaceKey(worktreeId)
   if (workspaceScope?.type === 'folder') {
     const folderWorkspaceId = workspaceScope.folderWorkspaceId
@@ -97,6 +102,9 @@ export function clearWorkspaceUnreadFlag(
   /** Folder rows share an id across hosts: the on-screen host's row, or null for every row. */
   executionHostId?: ExecutionHostId | null
 ): void {
+  if (ORCA_SIDEBAR_INPUTS_IS_MAIN) {
+    noteWindowUnreadDecision(worktreeId, false)
+  }
   const workspaceScope = parseWorkspaceKey(worktreeId)
   if (workspaceScope?.type === 'folder') {
     const folderWorkspaceId = workspaceScope.folderWorkspaceId
diff --git a/src/renderer/src/store/slices/worktrees-recent-stamp-switch-on.test.ts b/src/renderer/src/store/slices/worktrees-recent-stamp-switch-on.test.ts
index 52689e5c45c..40a80251340 100644
--- a/src/renderer/src/store/slices/worktrees-recent-stamp-switch-on.test.ts
+++ b/src/renderer/src/store/slices/worktrees-recent-stamp-switch-on.test.ts
@@ -26,7 +26,8 @@ vi.mock('@/components/worktree-base-fallback-notice', () => ({
 
 beforeEach(resetWorktreeSliceModuleMemory)
 
-// With the switch on, the owning host writes every Recent stamp; the window writes none.
+// With the switch on, the owning host writes every Recent stamp and the unread flag; the window
+// writes neither.
 describe('window-side Recent stamps with the sidebar-inputs switch on', () => {
   const wt = makeWorktree({
     id: 'repo1::/path/wt1',
@@ -61,7 +62,12 @@ describe('window-side Recent stamps with the sidebar-inputs switch on', () => {
     expect(persistedStamp()).toBe(false)
   })
 
-  it('a bell or finish raises the unread flag but writes no stamp', () => {
+  const persistedUnread = () =>
+    mockApi.worktrees.updateMeta.mock.calls.some(
+      ([args]: [{ updates: Record<string, unknown> }]) => 'isUnread' in args.updates
+    )
+
+  it('a bell or finish writes no stamp and leaves the unread flag to the host', () => {
     const store = storeWith()
     store.getState().markAgentAttentionUnread({
       workspaceId: wt.id,
@@ -69,7 +75,8 @@ describe('window-side Recent stamps with the sidebar-inputs switch on', () => {
       groupId: null,
       reason: 'agent-completion'
     })
-    expect(store.getState().worktreesByRepo.repo1[0].isUnread).toBe(true)
+    expect(store.getState().worktreesByRepo.repo1[0].isUnread).toBe(false)
+    expect(persistedUnread()).toBe(false)
     expect(lastActivityAt(store)).toBe(5)
     expect(persistedStamp()).toBe(false)
   })
@@ -82,7 +89,7 @@ describe('window-side Recent stamps with the sidebar-inputs switch on', () => {
     expect(persistedStamp()).toBe(false)
   })
 
-  it('a folder workspace’s terminal activity and unread mark write no stamp', async () => {
+  it('a folder workspace’s terminal activity and finish write no stamp and no flag', async () => {
     const store = createTestStore()
     const folder = makeFolderWorkspace({ id: 'folder-1', lastActivityAt: 5 })
     store.setState({ folderWorkspaces: [folder], projectGroups: [] })
@@ -95,10 +102,12 @@ describe('window-side Recent stamps with the sidebar-inputs switch on', () => {
     })
     await new Promise((resolve) => setTimeout(resolve, 0))
     expect(store.getState().folderWorkspaces[0]).toMatchObject({
-      isUnread: true,
+      isUnread: false,
       lastActivityAt: 5
     })
     const folderWrites = vi.mocked(store.getState().updateFolderWorkspace).mock.calls
-    expect(folderWrites.some(([, updates]) => 'lastActivityAt' in updates)).toBe(false)
+    expect(
+      folderWrites.some(([, updates]) => 'lastActivityAt' in updates || 'isUnread' in updates)
+    ).toBe(false)
   })
 })
diff --git a/src/shared/rpc-contract/client-workspace-view-params.ts b/src/shared/rpc-contract/client-workspace-view-params.ts
new file mode 100644
index 00000000000..8ac508bbd5e
--- /dev/null
+++ b/src/shared/rpc-contract/client-workspace-view-params.ts
@@ -0,0 +1,15 @@
+import { z } from 'zod'
+
+/**
+ * What a client window shows its user, sent by `sidebarInputs.reportView` to each host that owns
+ * one of those workspaces: the workspaces on screen and their tabs on screen. Each report replaces
+ * the client's last one; an empty one means the window is hidden or unfocused.
+ */
+export const ClientWorkspaceViewParams = z.object({
+  workspaceIds: z.array(z.string().min(1).max(1024)).max(64),
+  tabIds: z.array(z.string().min(1).max(1024)).max(256),
+  /** How long the user stays present without new input; null where presence is not tracked. */
+  presentForMs: z.number().int().nonnegative().nullable()
+})
+
+export type ClientWorkspaceView = z.infer<typeof ClientWorkspaceViewParams>
diff --git a/src/shared/rpc-contract/rpc-params-catalog.generated.ts b/src/shared/rpc-contract/rpc-params-catalog.generated.ts
index fc72eb49418..37f75bc50f9 100644
--- a/src/shared/rpc-contract/rpc-params-catalog.generated.ts
+++ b/src/shared/rpc-contract/rpc-params-catalog.generated.ts
@@ -145,6 +145,7 @@ import {
   SettingsUpdate
 } from './client-settings-params'
 import { FeatureInteractionIdParam, UiUpdate } from './client-ui-params'
+import { ClientWorkspaceViewParams } from './client-workspace-view-params'
 import {
   AbortImageUpload,
   AppendImageUploadChunk,
@@ -1264,6 +1265,7 @@ export const RPC_PARAMS_BY_METHOD = {
   'sidebarInputs.pairedServerRows': null,
   'sidebarInputs.read': SidebarInputsReadParams,
   'sidebarInputs.repoIcons': RepoIconDataUrlsParams,
+  'sidebarInputs.reportView': ClientWorkspaceViewParams,
   'sidebarInputs.reviewFacts': null,
   'sidebarInputs.temporal': null,
   'sidebarInputs.workspaceCreations': null,
diff --git a/src/shared/sidebar-list/sort-stamps.ts b/src/shared/sidebar-list/sort-stamps.ts
index 234de5a9b2c..a9fc8a6baa1 100644
--- a/src/shared/sidebar-list/sort-stamps.ts
+++ b/src/shared/sidebar-list/sort-stamps.ts
@@ -134,3 +134,13 @@ export function classifySortStampEvent(
     ...(smart.smartTier !== undefined ? { smartTier: smart.smartTier, smartAt: smart.smartAt } : {})
   }
 }
+
+/** A finish, a request for input or a bell: news that flags the workspace for whoever isn't looking. */
+export function isUnreadNews(event: SortStampEvent): boolean {
+  return (
+    event.kind === 'bell' ||
+    (event.kind === 'agent' &&
+      event.from !== event.to &&
+      (event.to === 'done' || event.to === 'needs-you'))
+  )
+}
diff --git a/tests/e2e/sidebar-host-unread.spec.ts b/tests/e2e/sidebar-host-unread.spec.ts
new file mode 100644
index 00000000000..813c0a0a1cd
--- /dev/null
+++ b/tests/e2e/sidebar-host-unread.spec.ts
@@ -0,0 +1,83 @@
+import type { Page } from '@stablyai/playwright-test'
+import { test, expect } from './helpers/orca-app'
+import { postClaudeHook, readHookEndpoint } from './helpers/agent-hook-endpoint'
+import { SIDEBAR_INPUTS_BUILD, expectNoSidebarShadowMismatches } from './helpers/sidebar-shadow'
+import { ensureTerminalVisible, waitForActiveWorktree, waitForSessionReady } from './helpers/store'
+import { waitForActivePaneHookDescriptor, waitForActiveTerminalManager } from './helpers/terminal'
+import {
+  WorkspaceRowsSnapshotSchema,
+  type WorkspaceRow
+} from '../../src/shared/sidebar-list/workspace-rows'
+
+test.skip(
+  !SIDEBAR_INPUTS_BUILD,
+  'the host raises the unread flag only in an ORCA_SIDEBAR_INPUTS=main build'
+)
+
+async function readHostRow(page: Page, rowKey: string): Promise<WorkspaceRow | undefined> {
+  const response = await page.evaluate(() =>
+    window.api.runtime.call({ method: 'sidebarInputs.workspaceRows' })
+  )
+  if (!response.ok) {
+    throw new Error('sidebarInputs.workspaceRows failed')
+  }
+  return WorkspaceRowsSnapshotSchema.parse(response.result).rows[rowKey]
+}
+
+test('the host raises the unread flag where the window’s user is not looking, as the window would', async ({
+  orcaPage,
+  electronApp
+}) => {
+  test.setTimeout(90_000)
+  await waitForSessionReady(orcaPage)
+  await waitForActiveWorktree(orcaPage)
+  await ensureTerminalVisible(orcaPage)
+  await waitForActiveTerminalManager(orcaPage, 30_000)
+  const endpoint = await readHookEndpoint(electronApp)
+  const pane = await waitForActivePaneHookDescriptor(orcaPage)
+  const rowKey = `local|${pane.worktreeId}`
+  const unread = async (): Promise<boolean | undefined> =>
+    (await readHostRow(orcaPage, rowKey))?.isUnread
+  await expect.poll(unread).toBe(false)
+
+  // Input in the window confirms the user is present, and the agent's tab is on screen.
+  await orcaPage.mouse.move(40, 40)
+  await orcaPage.mouse.move(60, 60)
+  await postClaudeHook(endpoint, pane, { hook_event_name: 'UserPromptSubmit', prompt: 'go' })
+  await postClaudeHook(endpoint, pane, { hook_event_name: 'Stop', last_assistant_message: 'ok' })
+  await expect.poll(async () => (await readHostRow(orcaPage, rowKey))?.smartTier).toBe('done')
+  expect(await unread()).toBe(false)
+
+  // Settings is up, so no workspace is on screen: the finish is news.
+  await orcaPage.evaluate(() => window.__store?.setState({ activeView: 'tasks' }))
+  await postClaudeHook(endpoint, pane, { hook_event_name: 'UserPromptSubmit', prompt: 'more' })
+  await postClaudeHook(endpoint, pane, { hook_event_name: 'Stop', last_assistant_message: 'ok' })
+  await expect.poll(unread).toBe(true)
+  // The window's copy is the host's record.
+  await expect
+    .poll(() =>
+      orcaPage.evaluate(
+        (id) =>
+          Object.values(window.__store?.getState().worktreesByRepo ?? {})
+            .flat()
+            .find((worktree) => worktree.id === id)?.isUnread,
+        pane.worktreeId
+      )
+    )
+    .toBe(true)
+  await expectNoSidebarShadowMismatches(orcaPage)
+
+  // Mark as read writes through to the host.
+  await orcaPage.evaluate((id) => {
+    window.__store?.getState().setWorkspaceUnreadByUser(id, false, 'local')
+  }, pane.worktreeId)
+  await expect.poll(unread).toBe(false)
+
+  await postClaudeHook(endpoint, pane, {
+    hook_event_name: 'PermissionRequest',
+    tool_name: 'Bash',
+    tool_input: { command: 'ls' }
+  })
+  await expect.poll(unread).toBe(true)
+  await expectNoSidebarShadowMismatches(orcaPage)
+})