diff --git a/src/main/runtime/rpc/methods/client-ui-pairing-local-fields.test.ts b/src/main/runtime/rpc/methods/client-ui-pairing-local-fields.test.ts
index d6c08ad44cf..2e7ac3e93b1 100644
--- a/src/main/runtime/rpc/methods/client-ui-pairing-local-fields.test.ts
+++ b/src/main/runtime/rpc/methods/client-ui-pairing-local-fields.test.ts
@@ -49,6 +49,8 @@ describe('client UI RPC pairing-local field seams', () => {
     agentsFilterRepoIds: ['repo-a'],
     agentsShowChildAgents: true,
     agentsCompactMode: false,
+    agentsReadFilter: 'unread',
+    agentsGroupBy: 'project',
     activityClearedAtByPaneKey: { 'tab-1:leaf-1': 123 },
     manuallyUnreadTurnsByPaneKey: { 'tab-1:leaf-1': 321 }
   }
diff --git a/src/main/runtime/rpc/methods/client-ui-schemas.ts b/src/main/runtime/rpc/methods/client-ui-schemas.ts
index edb3f651c32..688de5c3f36 100644
--- a/src/main/runtime/rpc/methods/client-ui-schemas.ts
+++ b/src/main/runtime/rpc/methods/client-ui-schemas.ts
@@ -126,6 +126,8 @@ const UiUpdateFields = z
     agentsFilterRepoIds: StringArray.optional(),
     agentsShowChildAgents: z.boolean().optional(),
     agentsCompactMode: z.boolean().optional(),
+    agentsReadFilter: z.enum(['all', 'unread']).optional(),
+    agentsGroupBy: z.enum(['none', 'status', 'project', 'worktree', 'agent']).optional(),
     workspaceHostOrder: z.array(z.string()).optional(),
     automationHostFilter: z
       .union([
diff --git a/src/renderer/src/components/activity/ActivityPrototypePage.tsx b/src/renderer/src/components/activity/ActivityPrototypePage.tsx
index 83581d4cf10..44c1f398122 100644
--- a/src/renderer/src/components/activity/ActivityPrototypePage.tsx
+++ b/src/renderer/src/components/activity/ActivityPrototypePage.tsx
@@ -21,22 +21,20 @@ import {
   useActivityTerminalLoadingLabel,
   useActivityTerminalPortalStatus
 } from './activity-terminal-portal-status'
-import type {
-  ActivityGroupBy,
-  ActivityTerminalPortalSlotId,
-  ThreadReadFilter
-} from './activity-thread-types'
+import type { ActivityTerminalPortalSlotId } from './activity-thread-types'
 
 export * from './activity-prototype-page-exports'
 
 export default function ActivityPrototypePage(): React.JSX.Element {
-  const [readFilter, setReadFilter] = useState<ThreadReadFilter>('all')
-  const [groupBy, setGroupBy] = useState<ActivityGroupBy>('status')
   const [query, setQuery] = useState('')
   const activityFilterInputRef = useRef<HTMLInputElement | null>(null)
   // Why: bounds auto mark-read to one acknowledgement per selected thread turn.
   const autoAcknowledgedTurnRef = useRef<string | null>(null)
   // Why store-backed: persisted preferences shared with the sidebar agents list.
+  const readFilter = useAppStore((s) => s.agentsReadFilter)
+  const setReadFilter = useAppStore((s) => s.setAgentsReadFilter)
+  const groupBy = useAppStore((s) => s.agentsGroupBy)
+  const setGroupBy = useAppStore((s) => s.setAgentsGroupBy)
   const compactMode = useAppStore((s) => s.agentsCompactMode)
   const setCompactMode = useAppStore((s) => s.setAgentsCompactMode)
   const showChildAgents = useAppStore((s) => s.agentsShowChildAgents)
diff --git a/src/renderer/src/components/activity/activity-thread-types.ts b/src/renderer/src/components/activity/activity-thread-types.ts
index 7225a71b935..ed73642c8eb 100644
--- a/src/renderer/src/components/activity/activity-thread-types.ts
+++ b/src/renderer/src/components/activity/activity-thread-types.ts
@@ -9,8 +9,8 @@ import type { TerminalTab } from '../../../../shared/terminal-tab-types'
 import type { Worktree } from '../../../../shared/worktree/types'
 import type { ActivityPortalReadinessStatus } from './activity-portal-readiness-oscillation'
 
-export type ThreadReadFilter = 'all' | 'unread'
-export type ActivityGroupBy = 'none' | 'status' | 'project' | 'worktree' | 'agent'
+export type { ActivityGroupBy, ThreadReadFilter } from '../../../../shared/ui-chrome-types'
+
 export type ActivityEventState = Extract<AgentStatusState, 'done' | 'blocked' | 'waiting'>
 export type ActivityHookLiveAgentState = Extract<
   AgentStatusState,
diff --git a/src/renderer/src/components/sidebar/SidebarAgentsList.tsx b/src/renderer/src/components/sidebar/SidebarAgentsList.tsx
index 5d82b56253a..ca5a8c5bce1 100644
--- a/src/renderer/src/components/sidebar/SidebarAgentsList.tsx
+++ b/src/renderer/src/components/sidebar/SidebarAgentsList.tsx
@@ -41,7 +41,7 @@ export default function SidebarAgentsList({
 }: SidebarAgentsListProps): React.JSX.Element {
   // The search row is owned here and mounts conditionally, so subscribe this host to locale changes.
   useTranslation()
-  // Why store-backed: these are persisted preferences (agents* UI fields), unlike the momentary read filter/search.
+  // Why store-backed: these are persisted preferences (agents* UI fields), unlike the momentary search.
   const compactMode = useAppStore((s) => s.agentsCompactMode)
   const setCompactMode = useAppStore((s) => s.setAgentsCompactMode)
   const showChildAgents = useAppStore((s) => s.agentsShowChildAgents)
diff --git a/src/renderer/src/components/sidebar/index.tsx b/src/renderer/src/components/sidebar/index.tsx
index 90c31999bd3..8b837b5ef39 100644
--- a/src/renderer/src/components/sidebar/index.tsx
+++ b/src/renderer/src/components/sidebar/index.tsx
@@ -11,7 +11,6 @@ import WorkspaceKanbanDrawer from './WorkspaceKanbanDrawer'
 import type { VirtualizedScrollAnchor } from '@/hooks/useVirtualizedScrollAnchor'
 import { cn } from '@/lib/utils'
 import { FolderPlus, Loader2 } from 'lucide-react'
-import type { ActivityGroupBy, ThreadReadFilter } from '@/components/activity/activity-thread-types'
 import { ActivityThreadCollapseContext } from '@/components/activity/activity-thread-collapse-context'
 import { useSidebarProjectDrop } from './useSidebarProjectDrop'
 import { useWorkspaceBoardPanel } from './useWorkspaceBoardPanel'
@@ -59,8 +58,10 @@ function Sidebar({
   const showAgentDashboard = settings?.experimentalAgentDashboardPopout === true
   const agentDashboardDrawerOpen = useAppStore((s) => s.agentDashboardDrawerOpen)
   const setAgentDashboardDrawerOpen = useAppStore((s) => s.setAgentDashboardDrawerOpen)
-  const [agentReadFilter, setAgentReadFilter] = React.useState<ThreadReadFilter>('all')
-  const [agentGroupBy, setAgentGroupBy] = React.useState<ActivityGroupBy>('status')
+  const agentReadFilter = useAppStore((s) => s.agentsReadFilter)
+  const setAgentReadFilter = useAppStore((s) => s.setAgentsReadFilter)
+  const agentGroupBy = useAppStore((s) => s.agentsGroupBy)
+  const setAgentGroupBy = useAppStore((s) => s.setAgentsGroupBy)
   const [agentQuery, setAgentQuery] = React.useState('')
   const [agentOptionsTarget, setAgentOptionsTarget] = React.useState<HTMLDivElement | null>(null)
   const agentsScrollTopRef = React.useRef(0)
diff --git a/src/renderer/src/store/slices/ui-hydration-workspace-preferences.test.ts b/src/renderer/src/store/slices/ui-hydration-workspace-preferences.test.ts
index 642297bb109..6d3a559c582 100644
--- a/src/renderer/src/store/slices/ui-hydration-workspace-preferences.test.ts
+++ b/src/renderer/src/store/slices/ui-hydration-workspace-preferences.test.ts
@@ -551,6 +551,27 @@ describe('createUISlice hydratePersistedUI', () => {
     expect(store.getState().agentsFilterRepoIds).toEqual([])
     expect(store.getState().agentsShowChildAgents).toBe(false)
     expect(store.getState().agentsCompactMode).toBe(true)
+    expect(store.getState().agentsReadFilter).toBe('all')
+    expect(store.getState().agentsGroupBy).toBe('status')
+  })
+
+  it('restores the persisted agents read filter and grouping, rejecting unknown values', () => {
+    const store = createUIStore()
+
+    store
+      .getState()
+      .hydratePersistedUI(makePersistedUI({ agentsReadFilter: 'unread', agentsGroupBy: 'project' }))
+    expect(store.getState().agentsReadFilter).toBe('unread')
+    expect(store.getState().agentsGroupBy).toBe('project')
+
+    store.getState().hydratePersistedUI(
+      makePersistedUI({
+        agentsReadFilter: 'bogus' as unknown as PersistedUIState['agentsReadFilter'],
+        agentsGroupBy: 'bogus' as unknown as PersistedUIState['agentsGroupBy']
+      })
+    )
+    expect(store.getState().agentsReadFilter).toBe('all')
+    expect(store.getState().agentsGroupBy).toBe('status')
   })
 
   it('sanitizes malformed agents repo filters before the repo catalog loads', () => {
diff --git a/src/renderer/src/store/slices/ui/ui-slice-contract-preferences.ts b/src/renderer/src/store/slices/ui/ui-slice-contract-preferences.ts
index 2e764e5cd79..1162f399cd5 100644
--- a/src/renderer/src/store/slices/ui/ui-slice-contract-preferences.ts
+++ b/src/renderer/src/store/slices/ui/ui-slice-contract-preferences.ts
@@ -1,9 +1,11 @@
 import type { PersistedUIState } from '../../../../../shared/persisted-ui-state-types'
 import type {
+  ActivityGroupBy,
   AgentActivityDisplayMode,
   ManualRepoOrderEntry,
   ProjectOrderBy,
   StatusBarItem,
+  ThreadReadFilter,
   WorktreeCardMode,
   WorktreeCardProperty,
   WorkspaceHostOrder,
@@ -71,6 +73,10 @@ export type UISlicePreferences = {
   setAgentsShowChildAgents: (v: boolean) => void
   agentsCompactMode: boolean
   setAgentsCompactMode: (v: boolean) => void
+  agentsReadFilter: ThreadReadFilter
+  setAgentsReadFilter: (v: ThreadReadFilter) => void
+  agentsGroupBy: ActivityGroupBy
+  setAgentsGroupBy: (v: ActivityGroupBy) => void
   collapsedGroups: Set<string>
   toggleCollapsedGroup: (key: string) => void
   worktreeCardProperties: WorktreeCardProperty[]
diff --git a/src/renderer/src/store/slices/ui/ui-slice-hydration-actions.ts b/src/renderer/src/store/slices/ui/ui-slice-hydration-actions.ts
index f44774b3770..08adff8e2a3 100644
--- a/src/renderer/src/store/slices/ui/ui-slice-hydration-actions.ts
+++ b/src/renderer/src/store/slices/ui/ui-slice-hydration-actions.ts
@@ -20,6 +20,10 @@ import {
   normalizeWorktreeCardProperties,
   normalizeAgentActivityDisplayMode
 } from '../../../../../shared/constants'
+import {
+  normalizeActivityGroupBy,
+  normalizeThreadReadFilter
+} from '../../../../../shared/agents-view-thread-filters'
 import {
   clampWorkspaceBoardColumnWidth,
   clampWorkspaceBoardOpacity,
@@ -182,6 +186,8 @@ export function createUiHydrationActions(set: UISliceSet, _get: UISliceGet): Par
           ),
           agentsShowChildAgents: ui.agentsShowChildAgents === true,
           agentsCompactMode: ui.agentsCompactMode !== false,
+          agentsReadFilter: normalizeThreadReadFilter(ui.agentsReadFilter),
+          agentsGroupBy: normalizeActivityGroupBy(ui.agentsGroupBy),
           collapsedGroups: new Set(ui.collapsedGroups ?? []),
           uiZoomLevel: ui.uiZoomLevel ?? 0,
           editorFontZoomLevel: ui.editorFontZoomLevel ?? 0,
diff --git a/src/renderer/src/store/slices/ui/ui-slice-preference-actions.ts b/src/renderer/src/store/slices/ui/ui-slice-preference-actions.ts
index 971c64dfa52..9a9dc5947b1 100644
--- a/src/renderer/src/store/slices/ui/ui-slice-preference-actions.ts
+++ b/src/renderer/src/store/slices/ui/ui-slice-preference-actions.ts
@@ -1,4 +1,8 @@
 import type { UISlice, UISliceGet, UISliceSet } from './ui-slice-contract'
+import {
+  DEFAULT_AGENTS_GROUP_BY,
+  DEFAULT_AGENTS_READ_FILTER
+} from '../../../../../shared/agents-view-thread-filters'
 import {
   DEFAULT_AGENT_ACTIVITY_DISPLAY_MODE,
   DEFAULT_SHOW_SLEEPING_WORKSPACES,
@@ -170,6 +174,16 @@ export function createUiPreferenceActions(set: UISliceSet, get: UISliceGet): Par
       set({ agentsCompactMode: v })
       window.api.ui.set({ agentsCompactMode: v }).catch(console.error)
     },
+    agentsReadFilter: DEFAULT_AGENTS_READ_FILTER,
+    setAgentsReadFilter: (v) => {
+      set({ agentsReadFilter: v })
+      window.api.ui.set({ agentsReadFilter: v }).catch(console.error)
+    },
+    agentsGroupBy: DEFAULT_AGENTS_GROUP_BY,
+    setAgentsGroupBy: (v) => {
+      set({ agentsGroupBy: v })
+      window.api.ui.set({ agentsGroupBy: v }).catch(console.error)
+    },
 
     collapsedGroups: new Set<string>(),
     toggleCollapsedGroup: (key) =>
diff --git a/src/renderer/src/web/preload-api/web-preference-normalization.ts b/src/renderer/src/web/preload-api/web-preference-normalization.ts
index 9ae3ad00d4a..be7e02f029a 100644
--- a/src/renderer/src/web/preload-api/web-preference-normalization.ts
+++ b/src/renderer/src/web/preload-api/web-preference-normalization.ts
@@ -73,6 +73,8 @@ export function mergeHostWebUIState(
     agentsFilterRepoIds: local.agentsFilterRepoIds,
     agentsShowChildAgents: local.agentsShowChildAgents,
     agentsCompactMode: local.agentsCompactMode,
+    agentsReadFilter: local.agentsReadFilter,
+    agentsGroupBy: local.agentsGroupBy,
     activityClearedAtByPaneKey: local.activityClearedAtByPaneKey,
     manuallyUnreadTurnsByPaneKey: local.manuallyUnreadTurnsByPaneKey
   } satisfies Record<PairingLocalUiField, unknown> & Partial<PersistedUIState>
diff --git a/src/renderer/src/web/web-preload-api-ui.test.ts b/src/renderer/src/web/web-preload-api-ui.test.ts
index 94e9ba8e1eb..a01ffbad567 100644
--- a/src/renderer/src/web/web-preload-api-ui.test.ts
+++ b/src/renderer/src/web/web-preload-api-ui.test.ts
@@ -469,6 +469,8 @@ describe('web UI preload API', () => {
     agentsFilterRepoIds: ['repo-b'],
     agentsShowChildAgents: true,
     agentsCompactMode: false,
+    agentsReadFilter: 'unread',
+    agentsGroupBy: 'project',
     activityClearedAtByPaneKey: { 'tab-1:leaf-1': 123 },
     manuallyUnreadTurnsByPaneKey: { 'tab-1:leaf-1': 321 }
   }
@@ -481,6 +483,8 @@ describe('web UI preload API', () => {
     agentsFilterRepoIds: ['repo-a'],
     agentsShowChildAgents: false,
     agentsCompactMode: true,
+    agentsReadFilter: 'all',
+    agentsGroupBy: 'status',
     activityClearedAtByPaneKey: { 'tab-2:leaf-2': 456 },
     manuallyUnreadTurnsByPaneKey: { 'tab-2:leaf-2': 654 }
   }
diff --git a/src/shared/agents-view-thread-filters.ts b/src/shared/agents-view-thread-filters.ts
new file mode 100644
index 00000000000..7f28caa1ee3
--- /dev/null
+++ b/src/shared/agents-view-thread-filters.ts
@@ -0,0 +1,22 @@
+import type { ActivityGroupBy, ThreadReadFilter } from './ui-chrome-types'
+
+export const DEFAULT_AGENTS_READ_FILTER: ThreadReadFilter = 'all'
+export const DEFAULT_AGENTS_GROUP_BY: ActivityGroupBy = 'status'
+
+const ACTIVITY_GROUP_BY_VALUES: ReadonlySet<string> = new Set<ActivityGroupBy>([
+  'none',
+  'status',
+  'project',
+  'worktree',
+  'agent'
+])
+
+export function normalizeThreadReadFilter(value: unknown): ThreadReadFilter {
+  return value === 'unread' || value === 'all' ? value : DEFAULT_AGENTS_READ_FILTER
+}
+
+export function normalizeActivityGroupBy(value: unknown): ActivityGroupBy {
+  return typeof value === 'string' && ACTIVITY_GROUP_BY_VALUES.has(value)
+    ? (value as ActivityGroupBy)
+    : DEFAULT_AGENTS_GROUP_BY
+}
diff --git a/src/shared/constants.ts b/src/shared/constants.ts
index 9d26b140dec..bb2f5940f0e 100644
--- a/src/shared/constants.ts
+++ b/src/shared/constants.ts
@@ -11,6 +11,7 @@ import { DEFAULT_STATUS_BAR_ITEMS } from './status-bar-defaults'
 import type { VoiceSettings } from './speech-types'
 import { cloneDefaultWorkspaceStatuses } from './workspace-statuses'
 import { DEFAULT_WORKTREE_CARD_PROPERTIES } from './worktree/card-properties'
+import { DEFAULT_AGENTS_GROUP_BY, DEFAULT_AGENTS_READ_FILTER } from './agents-view-thread-filters'
 import { DEFAULT_USAGE_PERCENTAGE_DISPLAY } from './usage-percentage-display'
 import { DEFAULT_STATUS_BAR_USAGE_MODE } from './status-bar-usage-mode'
 import { buildDefaultSettings } from './default-global-settings'
@@ -273,6 +274,8 @@ export function getDefaultUIState(): PersistedUIState {
     agentsFilterRepoIds: [],
     agentsShowChildAgents: false,
     agentsCompactMode: true,
+    agentsReadFilter: DEFAULT_AGENTS_READ_FILTER,
+    agentsGroupBy: DEFAULT_AGENTS_GROUP_BY,
     collapsedGroups: [],
     uiZoomLevel: 0,
     editorFontZoomLevel: 0,
diff --git a/src/shared/pairing-local-ui-fields.test.ts b/src/shared/pairing-local-ui-fields.test.ts
index ffc7baafe07..35bd5f33331 100644
--- a/src/shared/pairing-local-ui-fields.test.ts
+++ b/src/shared/pairing-local-ui-fields.test.ts
@@ -14,6 +14,8 @@ describe('pairing-local UI fields', () => {
       'agentsFilterRepoIds',
       'agentsShowChildAgents',
       'agentsCompactMode',
+      'agentsReadFilter',
+      'agentsGroupBy',
       'activityClearedAtByPaneKey',
       'manuallyUnreadTurnsByPaneKey'
     ])
diff --git a/src/shared/pairing-local-ui-fields.ts b/src/shared/pairing-local-ui-fields.ts
index d925c3094d8..f642bb2b821 100644
--- a/src/shared/pairing-local-ui-fields.ts
+++ b/src/shared/pairing-local-ui-fields.ts
@@ -17,6 +17,8 @@ export const PAIRING_LOCAL_UI_FIELDS = [
   'agentsFilterRepoIds',
   'agentsShowChildAgents',
   'agentsCompactMode',
+  'agentsReadFilter',
+  'agentsGroupBy',
   'activityClearedAtByPaneKey',
   'manuallyUnreadTurnsByPaneKey'
 ] as const satisfies readonly (keyof PersistedUIState)[]
diff --git a/src/shared/persisted-ui-state-types.ts b/src/shared/persisted-ui-state-types.ts
index 14e97bc34fc..b6d40480017 100644
--- a/src/shared/persisted-ui-state-types.ts
+++ b/src/shared/persisted-ui-state-types.ts
@@ -8,6 +8,7 @@ import type { StatusBarUsageMode } from './status-bar-usage-mode'
 import type { PersistedTrustedOrcaHooks } from './orca-yaml-hook-types'
 import type { CustomPet } from './pet-types'
 import type {
+  ActivityGroupBy,
   AgentActivityDisplayMode,
   ManualRepoOrderEntry,
   ProjectOrderBy,
@@ -15,6 +16,7 @@ import type {
   RightSidebarTab,
   StatusBarItem,
   TaskResumeState,
+  ThreadReadFilter,
   TopLevelView,
   VisibleWorkspaceHostIds,
   WorkspaceHostOrder,
@@ -81,6 +83,10 @@ export type PersistedUIState = {
   agentsShowChildAgents?: boolean
   /** Agents-view compact thread rows. Absent means on. */
   agentsCompactMode?: boolean
+  /** Agents-view unread-only thread filter. Absent means 'all'. */
+  agentsReadFilter?: ThreadReadFilter
+  /** Agents-view thread grouping. Absent means 'status'. */
+  agentsGroupBy?: ActivityGroupBy
   collapsedGroups: string[]
   uiZoomLevel: number
   editorFontZoomLevel: number
diff --git a/src/shared/ui-chrome-types.ts b/src/shared/ui-chrome-types.ts
index 90a12cf5b02..376b80b9d9a 100644
--- a/src/shared/ui-chrome-types.ts
+++ b/src/shared/ui-chrome-types.ts
@@ -49,6 +49,9 @@ export type WorktreeCardMode = 'Default' | 'Compact'
 
 export type AgentActivityDisplayMode = 'compact' | 'full'
 
+export type ThreadReadFilter = 'all' | 'unread'
+export type ActivityGroupBy = 'none' | 'status' | 'project' | 'worktree' | 'agent'
+
 export type StatusBarItem =
   | 'claude'
   | 'codex'