diff --git a/packages/client-runtime/src/state/threadSettled.ts b/packages/client-runtime/src/state/threadSettled.ts
index 104414a9201d..42703aae757c 100644
--- a/packages/client-runtime/src/state/threadSettled.ts
+++ b/packages/client-runtime/src/state/threadSettled.ts
@@ -102,24 +102,32 @@ export interface ThreadSnoozeShell extends QueuedThreadShell {
  */
 export function threadRaisedHandWhileSnoozed(shell: ThreadSnoozeShell): boolean {
   if (shell.hasPendingApprovals || shell.hasPendingUserInput) return true;
-  const runtime = shell.runtime ?? shell.session ?? null;
   const latestRun = shell.latestRun ?? shell.latestTurn ?? null;
-  // Only a FRESH failure raises the hand: a thread snoozed while already
+  // Only a FRESH run outcome raises the hand: a thread snoozed while already
   // failed stays snoozed — that snooze was the user saying "I saw it, not
-  // now". session.updatedAt stamps the status edge, so an error newer than
-  // the snooze is new information.
+  // now". The run's stable completion timestamp is the signal. Never use
+  // runtime.updatedAt here: in production shells it is projection activity
+  // time and advances on unrelated events (title updates, metadata changes),
+  // which used to wake snoozed limited threads long before their reset time.
   if (
-    (runtime?.status === "error" || runtime?.status === "failed") &&
-    (shell.snoozedAt == null ||
-      (runtime.updatedAt != null && Date.parse(runtime.updatedAt) > Date.parse(shell.snoozedAt)))
+    shell.snoozedAt != null &&
+    (latestRun?.state === "completed" ||
+      latestRun?.status === "completed" ||
+      latestRun?.state === "failed" ||
+      latestRun?.status === "failed") &&
+    latestRun.completedAt != null &&
+    Date.parse(latestRun.completedAt) > Date.parse(shell.snoozedAt)
   ) {
     return true;
   }
+  // Legacy session errors without a run timestamp: session.updatedAt stamps
+  // the status edge, so an error newer than the snooze is new information.
+  const session = shell.session ?? null;
   if (
-    shell.snoozedAt != null &&
-    (latestRun?.state === "completed" || latestRun?.status === "completed") &&
-    latestRun.completedAt != null &&
-    Date.parse(latestRun.completedAt) > Date.parse(shell.snoozedAt)
+    session !== null &&
+    (session.status === "error" || session.status === "failed") &&
+    (shell.snoozedAt == null ||
+      (session.updatedAt != null && Date.parse(session.updatedAt) > Date.parse(shell.snoozedAt)))
   ) {
     return true;
   }
@@ -198,7 +206,10 @@ export function threadWokeAt(
     const runtime = shell.runtime ?? shell.session ?? null;
     if (
       shell.snoozedAt != null &&
-      (latestRun?.state === "completed" || latestRun?.status === "completed") &&
+      (latestRun?.state === "completed" ||
+        latestRun?.status === "completed" ||
+        latestRun?.state === "failed" ||
+        latestRun?.status === "failed") &&
       latestRun.completedAt != null &&
       Date.parse(latestRun.completedAt) > Date.parse(shell.snoozedAt)
     ) {
diff --git a/packages/client-runtime/src/state/threadSnoozed.test.ts b/packages/client-runtime/src/state/threadSnoozed.test.ts
index 793d5a4a3a95..e38d07dd2648 100644
--- a/packages/client-runtime/src/state/threadSnoozed.test.ts
+++ b/packages/client-runtime/src/state/threadSnoozed.test.ts
@@ -168,6 +168,63 @@ describe("threadRaisedHandWhileSnoozed", () => {
   });
 });
 
+describe("effectiveSnoozed with production runtime shells", () => {
+  function productionFailedShell(overrides: {
+    readonly runtimeUpdatedAt: string;
+    readonly runCompletedAt: string | null;
+  }): ThreadSnoozeShell {
+    return {
+      snoozedUntil: FUTURE_WAKE,
+      // Snoozed at 09:00, after the usage-limit failure.
+      snoozedAt: SNOOZED_AT,
+      hasPendingApprovals: false,
+      hasPendingUserInput: false,
+      runtime: {
+        threadId: ThreadId.make("thread-1"),
+        status: "failed",
+        providerName: "Codex",
+        runtimeMode: "full-access",
+        activeTurnId: null,
+        lastError: "boom",
+        updatedAt: overrides.runtimeUpdatedAt,
+      },
+      latestRun: {
+        turnId: TurnId.make("turn-1"),
+        status: "failed",
+        requestedAt: "2026-04-10T07:00:00.000Z",
+        startedAt: null,
+        completedAt: overrides.runCompletedAt,
+      },
+    };
+  }
+
+  it("stays snoozed when unrelated activity bumps runtime.updatedAt after a limit snooze", () => {
+    // A usage-limited thread snoozed until reset: failure at 08:00, snoozed at
+    // 09:00. A later title/metadata update bumps runtime.updatedAt
+    // (projection activity time) to 11:00 without any new failure. The thread
+    // must stay snoozed until the reset time.
+    expect(
+      effectiveSnoozed(
+        productionFailedShell({
+          runtimeUpdatedAt: "2026-04-10T11:00:00.000Z",
+          runCompletedAt: "2026-04-10T08:00:00.000Z",
+        }),
+        { now: NOW },
+      ),
+    ).toBe(true);
+  });
+
+  it("wakes when a run fails after the snooze was set", () => {
+    const shell = productionFailedShell({
+      runtimeUpdatedAt: "2026-04-10T11:00:00.000Z",
+      runCompletedAt: "2026-04-10T10:30:00.000Z",
+    });
+    expect(effectiveSnoozed(shell, { now: NOW })).toBe(false);
+    expect(threadRaisedHandWhileSnoozed(shell)).toBe(true);
+    expect(threadWokeAt(shell, { now: NOW })).toBe("2026-04-10T10:30:00.000Z");
+  });
+});
+
 describe("canSnooze", () => {
   it("allows snoozing quiet and working threads alike", () => {
     expect(canSnooze({ ...makeShell({}), latestUserMessageAt: null }, { now: NOW })).toBe(true);