diff --git a/apps/mobile/src/App.tsx b/apps/mobile/src/App.tsx
index 06bd4bc57733..0bfb03afc8c5 100644
--- a/apps/mobile/src/App.tsx
+++ b/apps/mobile/src/App.tsx
@@ -10,6 +10,7 @@ import { createStaticNavigation, DarkTheme, DefaultTheme } from "@react-navigati
 
 import { RegistryContext } from "@effect/atom-react";
 import { ConfirmDialogHost } from "./components/ConfirmDialogHost";
+import { RenameThreadDialogHost } from "./components/RenameThreadDialogHost";
 import { CloudAuthProvider } from "./features/cloud/CloudAuthProvider";
 import { prepareNativeShowcaseCapture } from "./features/showcase/nativeShowcaseScene";
 import { IncomingShareProvider } from "./features/sharing/IncomingShareProvider";
@@ -88,6 +89,7 @@ export default function App() {
                     />
                   </IncomingShareProvider>
                   <ConfirmDialogHost />
+                  <RenameThreadDialogHost />
                 </BlurTargetView>
                 {/* Anchored-menu overlays render here — in-window, so the
                     keyboard stays up while a dropdown is open. */}
diff --git a/apps/mobile/src/components/RenameThreadDialogHost.tsx b/apps/mobile/src/components/RenameThreadDialogHost.tsx
new file mode 100644
index 000000000000..3b122785ab03
--- /dev/null
+++ b/apps/mobile/src/components/RenameThreadDialogHost.tsx
@@ -0,0 +1,142 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import { Modal, Pressable, TextInput, View } from "react-native";
+import { KeyboardAvoidingView } from "react-native-keyboard-controller";
+
+import { useThemeColor } from "../lib/useThemeColor";
+import { cn } from "../lib/cn";
+import { AppText, AppTextInput } from "./AppText";
+
+export type RenameThreadDialogRequest = {
+  /** Dialog heading. Defaults to "Rename thread". */
+  readonly title?: string;
+  /** Prefills the field; the user edits from here. */
+  readonly initialValue: string;
+  readonly confirmText?: string;
+  readonly cancelText?: string;
+  /** Called with the trimmed value only when it is non-empty and changed. */
+  readonly onSubmit: (value: string) => void;
+  readonly onCancel?: () => void;
+};
+
+let presentRequest: ((request: RenameThreadDialogRequest) => void) | null = null;
+
+/**
+ * Imperative rename dialog. React Native's Alert.prompt is iOS-only, so
+ * renaming a thread needs a custom modal to work on Android — this is the
+ * text-input sibling of showConfirmDialog. Requires RenameThreadDialogHost to
+ * be mounted at the app root.
+ */
+export function showRenameThreadDialog(request: RenameThreadDialogRequest): void {
+  presentRequest?.(request);
+}
+
+/**
+ * Single-field rename dialog styled to match ConfirmDialogHost: a centered
+ * card with a title, a prefilled text field, and Cancel / Rename actions.
+ * Rename stays disabled until the trimmed value is non-empty.
+ */
+export function RenameThreadDialogHost() {
+  const [request, setRequest] = useState<RenameThreadDialogRequest | null>(null);
+  const [value, setValue] = useState("");
+  const inputRef = useRef<TextInput>(null);
+  const pressedOverlay = useThemeColor("--color-subtle");
+
+  useEffect(() => {
+    presentRequest = (next) => {
+      setRequest(next);
+      setValue(next.initialValue);
+    };
+    return () => {
+      presentRequest = null;
+    };
+  }, []);
+
+  const handleCancel = useCallback(() => {
+    request?.onCancel?.();
+    setRequest(null);
+  }, [request]);
+
+  const trimmed = value.trim();
+  const canSubmit = trimmed.length > 0;
+
+  const handleConfirm = useCallback(() => {
+    if (request === null) return;
+    const next = value.trim();
+    if (next.length === 0) return;
+    // A no-op rename still dismisses the dialog, but never dispatches a
+    // pointless metadata update for an unchanged title.
+    if (next !== request.initialValue.trim()) {
+      request.onSubmit(next);
+    }
+    setRequest(null);
+  }, [request, value]);
+
+  return (
+    <Modal
+      visible={request !== null}
+      transparent
+      animationType="fade"
+      statusBarTranslucent
+      navigationBarTranslucent
+      onRequestClose={handleCancel}
+      onShow={() => inputRef.current?.focus()}
+    >
+      {request === null ? null : (
+        <KeyboardAvoidingView automaticOffset behavior="padding" className="flex-1">
+          <View className="flex-1 items-center justify-center bg-backdrop px-8">
+            <View className="w-full rounded-[24px] bg-card px-6 pb-4 pt-5">
+              <AppText className="text-lg font-t3-medium">
+                {request.title ?? "Rename thread"}
+              </AppText>
+              <AppTextInput
+                ref={inputRef}
+                className="mt-4"
+                value={value}
+                onChangeText={setValue}
+                autoFocus
+                selectTextOnFocus
+                returnKeyType="done"
+                onSubmitEditing={handleConfirm}
+                placeholder="Thread name"
+                accessibilityLabel="Thread name"
+              />
+              <View className="mt-5 flex-row justify-end gap-1">
+                <View className="overflow-hidden rounded-full">
+                  <Pressable
+                    accessibilityRole="button"
+                    className="min-h-10 items-center justify-center px-4"
+                    android_ripple={{ color: pressedOverlay }}
+                    onPress={handleCancel}
+                  >
+                    <AppText className="text-base font-t3-medium">
+                      {request.cancelText ?? "Cancel"}
+                    </AppText>
+                  </Pressable>
+                </View>
+                <View className="overflow-hidden rounded-full">
+                  <Pressable
+                    accessibilityRole="button"
+                    accessibilityState={{ disabled: !canSubmit }}
+                    className="min-h-10 items-center justify-center px-4"
+                    android_ripple={{ color: pressedOverlay }}
+                    disabled={!canSubmit}
+                    onPress={handleConfirm}
+                  >
+                    <AppText
+                      className={cn(
+                        "text-base font-t3-medium",
+                        canSubmit || "text-foreground-tertiary",
+                      )}
+                    >
+                      {request.confirmText ?? "Rename"}
+                    </AppText>
+                  </Pressable>
+                </View>
+              </View>
+            </View>
+          </View>
+        </KeyboardAvoidingView>
+      )}
+    </Modal>
+  );
+}
diff --git a/apps/mobile/src/features/home/HomeRouteScreen.tsx b/apps/mobile/src/features/home/HomeRouteScreen.tsx
index 7760920f7dbd..be79c9c09574 100644
--- a/apps/mobile/src/features/home/HomeRouteScreen.tsx
+++ b/apps/mobile/src/features/home/HomeRouteScreen.tsx
@@ -46,6 +46,7 @@ export function HomeRouteScreen() {
     unpinThread,
     movePinnedThread,
     unsettleThread,
+    renameThread,
   } = useThreadListActions();
   const pendingTasks = usePendingNewTasks();
   const { openPendingTask, confirmDeletePendingTask } = usePendingTaskListActions();
@@ -165,6 +166,7 @@ export function HomeRouteScreen() {
           }
           onArchiveThread={archiveThread}
           onDeleteThread={confirmDeleteThread}
+          onRenameThread={renameThread}
           onSettleThread={settleThread}
           onSnoozeThread={snoozeThread}
           onUnsnoozeThread={unsnoozeThread}
diff --git a/apps/mobile/src/features/home/HomeScreen.tsx b/apps/mobile/src/features/home/HomeScreen.tsx
index 64f0480d2231..ddccf9d3f686 100644
--- a/apps/mobile/src/features/home/HomeScreen.tsx
+++ b/apps/mobile/src/features/home/HomeScreen.tsx
@@ -101,6 +101,7 @@ interface HomeScreenProps {
   readonly onSelectThread: (thread: EnvironmentThreadShell) => void;
   readonly onArchiveThread: (thread: EnvironmentThreadShell) => void;
   readonly onDeleteThread: (thread: EnvironmentThreadShell) => void;
+  readonly onRenameThread: (thread: EnvironmentThreadShell) => void;
   /** Resolves true iff the settle was dispatched and succeeded. */
   readonly onSettleThread: (thread: EnvironmentThreadShell) => Promise<boolean>;
   readonly onSnoozeThread: (
@@ -811,6 +812,7 @@ export function HomeScreen(props: HomeScreenProps) {
           onSelectThread={props.onSelectThread}
           onDeleteThread={handleDeleteThread}
           onArchiveThread={props.onArchiveThread}
+          onRenameThread={props.onRenameThread}
           settlementSupported={settlementEnvironmentIds.has(thread.environmentId)}
           onSettleThread={handleSettleThread}
           snoozeSupported={snoozeEnvironmentIds.has(thread.environmentId)}
@@ -854,6 +856,7 @@ export function HomeScreen(props: HomeScreenProps) {
       projectByKey,
       projectCwdByKey,
       props.onArchiveThread,
+      props.onRenameThread,
       props.onDeletePendingTask,
       props.onSelectPendingTask,
       props.onSelectThread,
@@ -967,6 +970,7 @@ export function HomeScreen(props: HomeScreenProps) {
               searchQuery={props.searchQuery}
               onArchiveThread={props.onArchiveThread}
               onDeleteThread={props.onDeleteThread}
+              onRenameThread={props.onRenameThread}
               onSelectThread={props.onSelectThread}
               onSwipeableClose={handleSwipeableClose}
               onSwipeableWillOpen={handleSwipeableWillOpen}
@@ -992,6 +996,7 @@ export function HomeScreen(props: HomeScreenProps) {
       props.onArchiveThread,
       props.onDeletePendingTask,
       props.onDeleteThread,
+      props.onRenameThread,
       props.onNewThreadInProject,
       props.onSelectPendingTask,
       props.onSelectThread,
diff --git a/apps/mobile/src/features/home/useThreadListActions.ts b/apps/mobile/src/features/home/useThreadListActions.ts
index 3103c5379be2..b2b89cc1d7c3 100644
--- a/apps/mobile/src/features/home/useThreadListActions.ts
+++ b/apps/mobile/src/features/home/useThreadListActions.ts
@@ -6,6 +6,7 @@ import { useCallback, useRef } from "react";
 import { Alert } from "react-native";
 
 import { showConfirmDialog } from "../../components/ConfirmDialogHost";
+import { showRenameThreadDialog } from "../../components/RenameThreadDialogHost";
 import { scopedThreadKey } from "../../lib/scopedEntities";
 import { refreshArchivedThreadsForEnvironment } from "../archive/useArchivedThreadSnapshots";
 import {
@@ -227,8 +228,12 @@ export function useThreadListActions(): {
     thread: EnvironmentThreadShell,
     direction: "up" | "down",
   ) => Promise<boolean>;
+  readonly renameThread: (thread: EnvironmentThreadShell) => void;
 } {
   const executeAction = useThreadActionExecutor();
+  const updateMetadataMutation = useAtomCommand(threadEnvironment.updateMetadata, {
+    reportFailure: false,
+  });
   const snoozeMutation = useAtomCommand(threadEnvironment.snooze, { reportFailure: false });
   const unsnoozeMutation = useAtomCommand(threadEnvironment.unsnooze, { reportFailure: false });
   const pinMutation = useAtomCommand(threadEnvironment.pin, { reportFailure: false });
@@ -485,6 +490,33 @@ export function useThreadListActions(): {
     [reorderPinnedMutation],
   );
 
+  const renameThread = useCallback(
+    (thread: EnvironmentThreadShell) => {
+      showRenameThreadDialog({
+        initialValue: thread.title,
+        onSubmit: (title) => {
+          void (async () => {
+            selectionHaptic();
+            const result = await updateMetadataMutation({
+              environmentId: thread.environmentId,
+              input: { threadId: thread.id, title },
+            });
+            if (result._tag === "Failure") {
+              const error = Cause.squash(result.cause);
+              Alert.alert(
+                "Could not rename thread",
+                error instanceof Error && error.message.trim().length > 0
+                  ? error.message
+                  : "The thread could not be renamed.",
+              );
+            }
+          })();
+        },
+      });
+    },
+    [updateMetadataMutation],
+  );
+
   const confirmDeleteThread = useConfirmDeleteThread(executeAction);
 
   return {
@@ -497,6 +529,7 @@ export function useThreadListActions(): {
     pinThread,
     unpinThread,
     movePinnedThread,
+    renameThread,
   };
 }
 
diff --git a/apps/mobile/src/features/threads/ThreadNavigationSidebar.tsx b/apps/mobile/src/features/threads/ThreadNavigationSidebar.tsx
index d80d906ada17..4d63f719a1b1 100644
--- a/apps/mobile/src/features/threads/ThreadNavigationSidebar.tsx
+++ b/apps/mobile/src/features/threads/ThreadNavigationSidebar.tsx
@@ -211,6 +211,7 @@ function ThreadNavigationSidebarPane(
     pinThread,
     unpinThread,
     movePinnedThread,
+    renameThread,
   } = useThreadListActions();
   const threadListV2Enabled = useThreadListV2Enabled();
   const pendingTasks = usePendingNewTasks();
@@ -950,6 +951,7 @@ function ThreadNavigationSidebarPane(
               onSelectThread={handleSelectThread}
               onDeleteThread={confirmDeleteThread}
               onArchiveThread={archiveThread}
+              onRenameThread={renameThread}
               settlementSupported={settlementEnvironmentIds.has(thread.environmentId)}
               onSettleThread={settleThread}
               snoozeSupported={snoozeEnvironmentIds.has(thread.environmentId)}
@@ -1067,6 +1069,7 @@ function ThreadNavigationSidebarPane(
               fullSwipeWidth={props.width - 20}
               onArchiveThread={archiveThread}
               onDeleteThread={confirmDeleteThread}
+              onRenameThread={renameThread}
               onSelectThread={handleSelectThread}
               onSwipeableClose={handleSwipeableClose}
               onSwipeableWillOpen={handleSwipeableWillOpen}
@@ -1097,6 +1100,7 @@ function ThreadNavigationSidebarPane(
       handleSwipeableWillOpen,
       movePinnedThread,
       openPendingTask,
+      renameThread,
       pinReorderEnvironmentIds,
       pinThread,
       pinningEnvironmentIds,
diff --git a/apps/mobile/src/features/threads/thread-list-items.tsx b/apps/mobile/src/features/threads/thread-list-items.tsx
index 855713946ff8..b7182bc2bbd9 100644
--- a/apps/mobile/src/features/threads/thread-list-items.tsx
+++ b/apps/mobile/src/features/threads/thread-list-items.tsx
@@ -409,10 +409,17 @@ export const PendingTaskListRow = memo(function PendingTaskListRow(props: {
 
 /* ─── Thread row ─────────────────────────────────────────────────────── */
 
-const THREAD_ROW_MENU_ACTIONS: MenuAction[] = [
-  { id: "archive", title: "Archive", image: "archivebox" },
-  { id: "delete", title: "Delete", image: "trash", attributes: { destructive: true } },
-];
+const THREAD_ROW_MENU_ARCHIVE: MenuAction = {
+  id: "archive",
+  title: "Archive",
+  image: "archivebox",
+};
+const THREAD_ROW_MENU_DELETE: MenuAction = {
+  id: "delete",
+  title: "Delete",
+  image: "trash",
+  attributes: { destructive: true },
+};
 
 export const ThreadListRow = memo(function ThreadListRow(props: {
   readonly variant: ThreadListVariant;
@@ -429,6 +436,8 @@ export const ThreadListRow = memo(function ThreadListRow(props: {
   readonly onSelectThread: (thread: EnvironmentThreadShell) => void;
   readonly onArchiveThread: (thread: EnvironmentThreadShell) => void;
   readonly onDeleteThread: (thread: EnvironmentThreadShell) => void;
+  /** Adds a "Rename" menu item when provided. */
+  readonly onRenameThread?: (thread: EnvironmentThreadShell) => void;
   readonly onSwipeableWillOpen: (methods: SwipeableMethods) => void;
   readonly onSwipeableClose: (methods: SwipeableMethods) => void;
   readonly simultaneousSwipeGesture?: ComponentProps<
@@ -451,6 +460,7 @@ export const ThreadListRow = memo(function ThreadListRow(props: {
   const selectedBackgroundColor = useThemeColor("--color-user-bubble");
 
   const { thread, onSelectThread, onArchiveThread, onDeleteThread } = props;
+  const { onRenameThread } = props;
   const status = resolveThreadStatus(thread);
   const pr = useThreadPr(thread, props.projectCwd);
   const timestamp = relativeTime(
@@ -470,6 +480,17 @@ export const ThreadListRow = memo(function ThreadListRow(props: {
 
   const handleDelete = useCallback(() => onDeleteThread(thread), [onDeleteThread, thread]);
   const handleArchive = useCallback(() => onArchiveThread(thread), [onArchiveThread, thread]);
+  const handleRename = useCallback(() => onRenameThread?.(thread), [onRenameThread, thread]);
+  const menuActions = useMemo<MenuAction[]>(
+    () => [
+      ...(onRenameThread != null
+        ? [{ id: "rename", title: "Rename", image: "square.and.pencil" } satisfies MenuAction]
+        : []),
+      THREAD_ROW_MENU_ARCHIVE,
+      THREAD_ROW_MENU_DELETE,
+    ],
+    [onRenameThread],
+  );
   const primaryAction = useMemo(
     () => ({
       accessibilityLabel: `Archive ${thread.title}`,
@@ -481,10 +502,11 @@ export const ThreadListRow = memo(function ThreadListRow(props: {
   );
   const handleMenuAction = useCallback(
     ({ nativeEvent }: { readonly nativeEvent: { readonly event: string } }) => {
+      if (nativeEvent.event === "rename") handleRename();
       if (nativeEvent.event === "archive") handleArchive();
       if (nativeEvent.event === "delete") handleDelete();
     },
-    [handleArchive, handleDelete],
+    [handleArchive, handleDelete, handleRename],
   );
 
   const statusPill = effectiveStatus ? (
@@ -673,7 +695,7 @@ export const ThreadListRow = memo(function ThreadListRow(props: {
         // ControlPillMenu injects onLongPress into the row and anchors the
         // token-styled dropdown to it; taps and swipes are untouched.
         <ControlPillMenu
-          actions={THREAD_ROW_MENU_ACTIONS}
+          actions={menuActions}
           onPressAction={handleMenuAction}
           shouldOpenOnLongPress
         >
diff --git a/apps/mobile/src/features/threads/thread-list-v2-items.tsx b/apps/mobile/src/features/threads/thread-list-v2-items.tsx
index eb618146172e..eb44fffc45a5 100644
--- a/apps/mobile/src/features/threads/thread-list-v2-items.tsx
+++ b/apps/mobile/src/features/threads/thread-list-v2-items.tsx
@@ -345,6 +345,8 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
   readonly onUnsnoozeThread: (thread: EnvironmentThreadShell) => void;
   readonly onUnsettleThread: (thread: EnvironmentThreadShell) => void;
   readonly onArchiveThread: (thread: EnvironmentThreadShell) => void;
+  /** Adds a "Rename" menu item when provided. */
+  readonly onRenameThread?: (thread: EnvironmentThreadShell) => void;
   readonly onPinThread: (thread: EnvironmentThreadShell) => void;
   readonly onUnpinThread: (thread: EnvironmentThreadShell) => void;
   /** False on environments whose server predates thread.settle/unsettle:
@@ -388,6 +390,7 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
     onUnsnoozeThread,
     onUnsettleThread,
     onArchiveThread,
+    onRenameThread,
     onPinThread,
     onUnpinThread,
     onMovePinnedThread,
@@ -434,6 +437,15 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
     [onMovePinnedThread, thread],
   );
   const handleArchive = useCallback(() => onArchiveThread(thread), [onArchiveThread, thread]);
+  const handleRename = useCallback(() => onRenameThread?.(thread), [onRenameThread, thread]);
+  // Rename leads every variant of the row menu, above the lifecycle and delete
+  // items, so both surfaces (this list and the v1 list) expose it regardless
+  // of settle/snooze/pin state.
+  const titleMenuItems = useMemo<MenuAction[]>(
+    () =>
+      onRenameThread != null ? [{ id: "rename", title: "Rename", image: "square.and.pencil" }] : [],
+    [onRenameThread],
+  );
 
   // Swipe: the v2 primary action is the lifecycle transition. Every settled
   // row can un-settle — explicit settles clear the override, auto-settled
@@ -525,6 +537,7 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
   );
   const handleMenuAction = useCallback(
     ({ nativeEvent }: { readonly nativeEvent: { readonly event: string } }) => {
+      if (nativeEvent.event === "rename") handleRename();
       if (nativeEvent.event === "settle") handleSettle();
       if (nativeEvent.event === "unsettle") handleUnsettle();
       if (nativeEvent.event === "unsnooze") handleUnsnooze();
@@ -551,6 +564,7 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
       handleMovePinnedDown,
       handleMovePinnedUp,
       handlePin,
+      handleRename,
       handleSettle,
       handleSnooze,
       handleUnpin,
@@ -885,8 +899,9 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
       >
         {(close) => (
           <ControlPillMenu
-            actions={
-              snoozedRow
+            actions={[
+              ...titleMenuItems,
+              ...(snoozedRow
                 ? SNOOZED_MENU_ACTIONS
                 : !props.settlementSupported
                   ? LEGACY_MENU_ACTIONS
@@ -894,8 +909,8 @@ export const ThreadListV2Row = memo(function ThreadListV2Row(props: {
                     ? SLIM_MENU_ACTIONS
                     : swipeActions.secondary === "snooze"
                       ? snoozableCardMenuActions
-                      : cardMenuActions
-            }
+                      : cardMenuActions),
+            ]}
             onPressAction={handleMenuAction}
             shouldOpenOnLongPress
           >