diff --git a/apps/mobile/src/features/threads/ThreadDetailScreen.tsx b/apps/mobile/src/features/threads/ThreadDetailScreen.tsx
index 27cce9c5795ba..8ef88e43be319 100644
--- a/apps/mobile/src/features/threads/ThreadDetailScreen.tsx
+++ b/apps/mobile/src/features/threads/ThreadDetailScreen.tsx
@@ -15,7 +15,7 @@ import { parseThreadKey, threadKey } from "@t3tools/client-runtime/state/entitie
 import { createThreadVisitTracker } from "@t3tools/client-runtime/state/thread-visits";
 import { useChildThreadInputs, useThreadReportedModelSelection } from "../../state/entities";
 import { UsageLimitRecoveryCard } from "./UsageLimitRecoveryCard";
-import { useFocusEffect, useNavigation } from "@react-navigation/native";
+import { useFocusEffect, useIsFocused, useNavigation } from "@react-navigation/native";
 import {
   effectiveSnoozed,
   threadWokeAt,
@@ -208,6 +208,8 @@ import type { ThreadContentPresentation } from "./threadContentPresentation";
 import { resolveThreadFeedSubmissionAnchor } from "./thread-feed-live-follow";
 import { useOpenLinkedThread } from "./useOpenLinkedThread";
 import { useGlobalVoiceInput } from "../voice-input/VoiceInputProvider";
+import { useEnvironmentShellReadiness } from "../../state/shell";
+import { useSettledThreadView } from "./useSettledThreadView";
 import type { OrchestrationV2ProviderSession } from "@t3tools/contracts";
 
 export interface ThreadDetailScreenProps {
@@ -1217,14 +1219,18 @@ function ThreadDetailBody(
     }
   };
   const showContent = props.showContent ?? true;
-  // Showing the thread counts as viewing it, before its live shell arrives too.
-  useAtomMount(
-    threadVisitTracker(
-      showContent && !props.draftMode
-        ? { environmentId: props.environmentId, threadId: props.selectedThread.id }
-        : null,
-    ),
+  // Showing the thread counts as viewing it; after a resume or sync, only once it settles.
+  const shellSynchronizing =
+    useEnvironmentShellReadiness(props.environmentId).status === "synchronizing";
+  const covered = !useIsFocused();
+  const viewedThread = useSettledThreadView(
+    showContent && !props.draftMode
+      ? { environmentId: props.environmentId, threadId: props.selectedThread.id }
+      : null,
+    shellSynchronizing,
+    covered,
   );
+  useAtomMount(threadVisitTracker(viewedThread));
   const layoutVariant = props.layoutVariant ?? "compact";
   const isSplitLayout = layoutVariant !== "compact";
   const contentMaxWidth =
diff --git a/apps/mobile/src/features/threads/threadViewInterruption.test.ts b/apps/mobile/src/features/threads/threadViewInterruption.test.ts
new file mode 100644
index 0000000000000..91d34b1622e27
--- /dev/null
+++ b/apps/mobile/src/features/threads/threadViewInterruption.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vite-plus/test";
+
+import { nextThreadViewState } from "./threadViewInterruption";
+
+describe("nextThreadViewState", () => {
+  it("counts a thread opened while synced and in the foreground at once", () => {
+    expect(nextThreadViewState(null, "env:a", true)).toEqual({ key: "env:a", interrupted: false });
+  });
+
+  it("waits for a thread opened while syncing or in the background", () => {
+    expect(nextThreadViewState(null, "env:a", false)).toEqual({ key: "env:a", interrupted: true });
+  });
+
+  it("keeps waiting after a resume or sync interrupts the view, until another thread opens", () => {
+    const opened = nextThreadViewState(null, "env:a", true);
+    const hidden = nextThreadViewState(opened, "env:a", false);
+    expect(hidden).toEqual({ key: "env:a", interrupted: true });
+    expect(nextThreadViewState(hidden, "env:a", true)).toBe(hidden);
+    expect(nextThreadViewState(hidden, "env:b", true)).toEqual({
+      key: "env:b",
+      interrupted: false,
+    });
+  });
+
+  it("returns the same state while nothing changes", () => {
+    const opened = nextThreadViewState(null, "env:a", true);
+    expect(nextThreadViewState(opened, "env:a", true)).toBe(opened);
+    expect(nextThreadViewState(opened, null, true)).toBeNull();
+  });
+});
diff --git a/apps/mobile/src/features/threads/threadViewInterruption.ts b/apps/mobile/src/features/threads/threadViewInterruption.ts
new file mode 100644
index 0000000000000..ef4c8113c478d
--- /dev/null
+++ b/apps/mobile/src/features/threads/threadViewInterruption.ts
@@ -0,0 +1,17 @@
+export interface ThreadViewState {
+  readonly key: string;
+  /** The view began, or has since been, hidden or syncing, so reading waits for it to settle. */
+  readonly interrupted: boolean;
+}
+
+/** The next view state for the shown thread; returns `previous` itself when nothing changed. */
+export function nextThreadViewState(
+  previous: ThreadViewState | null,
+  key: string | null,
+  visible: boolean,
+): ThreadViewState | null {
+  if (key === null) return null;
+  if (previous?.key !== key) return { key, interrupted: !visible };
+  if (!visible && !previous.interrupted) return { key, interrupted: true };
+  return previous;
+}
diff --git a/apps/mobile/src/features/threads/useSettledThreadView.ts b/apps/mobile/src/features/threads/useSettledThreadView.ts
new file mode 100644
index 0000000000000..f1e77bc2e5308
--- /dev/null
+++ b/apps/mobile/src/features/threads/useSettledThreadView.ts
@@ -0,0 +1,44 @@
+import type { ScopedThreadRef } from "@t3tools/contracts";
+import { useEffect, useMemo, useState } from "react";
+
+import { useAppActive } from "../../lib/appState";
+import { scopedThreadKey } from "../../lib/scopedEntities";
+import { nextThreadViewState, type ThreadViewState } from "./threadViewInterruption";
+
+/** How long a thread shows, synced and in the foreground, after a resume or sync before it counts as read. */
+const THREAD_READ_DWELL_MS = 2_000;
+
+/**
+ * The thread while it counts as viewed. A synced open counts at once; after a resume or sync a
+ * finished run may land unseen, so the view counts only once the thread has shown, synced, in the
+ * foreground and uncovered, for a moment. Backing out sooner keeps it unread.
+ */
+export function useSettledThreadView(
+  ref: ScopedThreadRef | null,
+  synchronizing: boolean,
+  covered: boolean,
+): ScopedThreadRef | null {
+  const active = useAppActive();
+  const key = ref === null ? null : scopedThreadKey(ref.environmentId, ref.threadId);
+  const visible = active && !synchronizing && key !== null;
+  const [opened, setOpened] = useState<ThreadViewState | null>(null);
+  const next = nextThreadViewState(opened, key, visible);
+  if (next !== opened) setOpened(next);
+  const interrupted = next?.interrupted ?? false;
+  // A fresh view each time the thread shows again, so the wait restarts even if no timer ran
+  // while the app was in the background or the thread was covered.
+  const view = useMemo(
+    () => (visible && !covered && key !== null ? { key } : null),
+    [visible, covered, key],
+  );
+  const [settled, setSettled] = useState<{ readonly key: string } | null>(null);
+  // oxlint-disable-next-line t3code/no-unreasoned-state-sync -- times how long a resumed or synced thread has shown in the foreground
+  useEffect(() => {
+    if (view === null || !interrupted) return;
+    const timer = setTimeout(() => setSettled(view), THREAD_READ_DWELL_MS);
+    return () => clearTimeout(timer);
+  }, [view, interrupted]);
+  if (!visible) return null;
+  if (!interrupted) return ref;
+  return view !== null && settled === view ? ref : null;
+}