diff --git a/apps/mobile/src/features/agent-awareness/agentLiveActivity.ios.ts b/apps/mobile/src/features/agent-awareness/agentLiveActivity.ios.ts
index ab078b29a665..1cb7369af559 100644
--- a/apps/mobile/src/features/agent-awareness/agentLiveActivity.ios.ts
+++ b/apps/mobile/src/features/agent-awareness/agentLiveActivity.ios.ts
@@ -4,6 +4,6 @@ export function getAgentLiveActivities() {
   return AgentActivity.getInstances();
 }
 
-export function startAgentLiveActivity(props: AgentActivityProps) {
-  return AgentActivity.start(props);
+export function startAgentLiveActivity(props: AgentActivityProps, staleDate?: Date) {
+  return AgentActivity.start(props, undefined, staleDate);
 }
diff --git a/apps/mobile/src/features/agent-awareness/agentLiveActivity.ts b/apps/mobile/src/features/agent-awareness/agentLiveActivity.ts
index 44ac017984d9..18c3ffcf519b 100644
--- a/apps/mobile/src/features/agent-awareness/agentLiveActivity.ts
+++ b/apps/mobile/src/features/agent-awareness/agentLiveActivity.ts
@@ -7,6 +7,7 @@ export function getAgentLiveActivities(): Array<LiveActivity<AgentActivityProps>
 
 export function startAgentLiveActivity(
   _props: AgentActivityProps,
+  _staleDate?: Date,
 ): LiveActivity<AgentActivityProps> | null {
   return null;
 }
diff --git a/apps/mobile/src/features/agent-awareness/remoteRegistration.ts b/apps/mobile/src/features/agent-awareness/remoteRegistration.ts
index a6c31594327a..7ed7ddc8bae1 100644
--- a/apps/mobile/src/features/agent-awareness/remoteRegistration.ts
+++ b/apps/mobile/src/features/agent-awareness/remoteRegistration.ts
@@ -83,6 +83,11 @@ const activityPushTokenListeners = new WeakSet<LiveActivity<AgentActivityProps>>
 // foreground after real time away still triggers a replay. Cleared on
 // sign-out/identity change alongside the device registration state.
 const ACTIVITY_TOKEN_REREGISTER_INTERVAL_MS = 60_000;
+// Locally started activities carry the same stale window the relay puts on
+// every push (STALE_AFTER_SECONDS in ApnsClient.ts), so a card whose relay
+// registration never lands still degrades instead of looking alive forever.
+const LIVE_ACTIVITY_STALE_AFTER_MS = 10 * 60_000;
+const liveActivityStaleDate = () => new Date(Date.now() + LIVE_ACTIVITY_STALE_AFTER_MS);
 const registeredActivityPushTokens = new Map<string, number>();
 let androidDeviceReplayedAt: number | null = null;
 let pushTokenSubscription: { remove: () => void } | null = null;
@@ -527,25 +532,28 @@ function armAgentAwarenessLiveActivityForLocalWorkNow(input: {
       return;
     }
     const nowIso = new Date(Date.now()).toISOString();
-    const activity = startAgentLiveActivity({
-      title: "T3 Code",
-      subtitle: "Agent work in progress",
-      activeCount: 1,
-      updatedAt: nowIso,
-      activities: [
-        {
-          environmentId: "",
-          threadId: "",
-          projectTitle: input.projectTitle,
-          threadTitle: input.threadTitle,
-          modelTitle: "",
-          phase: "starting",
-          status: "Connecting",
-          updatedAt: nowIso,
-          deepLink: "/",
-        },
-      ],
-    });
+    const activity = startAgentLiveActivity(
+      {
+        title: "T3 Code",
+        subtitle: "Agent work in progress",
+        activeCount: 1,
+        updatedAt: nowIso,
+        activities: [
+          {
+            environmentId: "",
+            threadId: "",
+            projectTitle: input.projectTitle,
+            threadTitle: input.threadTitle,
+            modelTitle: "",
+            phase: "starting",
+            status: "Connecting",
+            updatedAt: nowIso,
+            deepLink: "/",
+          },
+        ],
+      },
+      liveActivityStaleDate(),
+    );
     if (!activity) {
       return;
     }
@@ -1131,13 +1139,16 @@ export function refreshActiveLiveActivityRemoteRegistration(): Effect.Effect<
           const aggregate = snapshot.aggregate;
           const primed = yield* Effect.try({
             try: () =>
-              startAgentLiveActivity({
-                title: aggregate.title,
-                subtitle: aggregate.subtitle,
-                activeCount: aggregate.activeCount,
-                updatedAt: aggregate.updatedAt,
-                activities: aggregate.activities,
-              }),
+              startAgentLiveActivity(
+                {
+                  title: aggregate.title,
+                  subtitle: aggregate.subtitle,
+                  activeCount: aggregate.activeCount,
+                  updatedAt: aggregate.updatedAt,
+                  activities: aggregate.activities,
+                },
+                liveActivityStaleDate(),
+              ),
             catch: (cause) =>
               new AgentAwarenessOperationError({
                 operation: "prime-live-activity",
diff --git a/apps/mobile/src/widgets/AgentActivity.test.ts b/apps/mobile/src/widgets/AgentActivity.test.ts
index 467f290a1575..bf02bb138c2f 100644
--- a/apps/mobile/src/widgets/AgentActivity.test.ts
+++ b/apps/mobile/src/widgets/AgentActivity.test.ts
@@ -82,6 +82,26 @@ describe("AgentActivity widget layout", () => {
     expect(banner).toContain("#fcd34d"); // amber-300: waiting_for_approval
   });
 
+  it("degrades in-flight rows once the system marks the activity stale", () => {
+    const layout = AgentActivity(
+      {
+        ...props,
+        activeCount: 2,
+        activities: [
+          makeRow({}),
+          makeRow({ threadId: "thread-2", phase: "completed", status: "Done" }),
+        ],
+      },
+      { ...environment, isStale: true } as never,
+    );
+    const banner = JSON.stringify(layout.banner);
+    expect(banner).toContain("Agent status out of date");
+    expect(banner).toContain("Out of date");
+    expect(banner).not.toContain("#7dd3fc"); // sky-300: running
+    expect(banner).toContain("Done");
+    expect(JSON.stringify(layout.minimal)).not.toContain("2");
+  });
+
   it("switches to the web sidebar's light palette when the scheme is light", () => {
     // macOS (iPhone Mirroring / Mac notification center) renders the activity
     // on a light background; the dark-material palette is illegible there.
diff --git a/apps/mobile/src/widgets/AgentActivity.tsx b/apps/mobile/src/widgets/AgentActivity.tsx
index 3e9b417c5aae..bc27e8b88113 100644
--- a/apps/mobile/src/widgets/AgentActivity.tsx
+++ b/apps/mobile/src/widgets/AgentActivity.tsx
@@ -88,6 +88,8 @@ export function AgentActivity(
         return isLightScheme ? "#dc2626" : "#fca5a5"; // red-600 / red-300
       case "completed":
         return isLightScheme ? "#059669" : "#6ee7b7"; // emerald-600 / emerald-300
+      case "stale":
+        return secondaryForeground;
       case "starting":
       case "running":
       default:
@@ -103,20 +105,28 @@ export function AgentActivity(
     if (phase === "running" || phase === "starting") return 2;
     return 3;
   };
-  const ordered = [...props.activities].sort(
-    (a, b) => phasePriority(a.phase) - phasePriority(b.phase),
-  );
+  // Past the stale date the system stops vouching for the content, so every
+  // in-flight row degrades to "stale" rather than claiming an agent is still
+  // working. Terminal phases keep their own state.
+  const activities: ReadonlyArray<AgentActivityRowProps> = environment.isStale
+    ? props.activities.map((row) =>
+        row.phase === "completed" || row.phase === "failed"
+          ? row
+          : { ...row, phase: "stale", status: "Out of date" },
+      )
+    : props.activities;
+  const ordered = [...activities].sort((a, b) => phasePriority(a.phase) - phasePriority(b.phase));
   const row0 = ordered[0];
   const row1 = ordered[1];
   const row2 = ordered[2];
   const row3 = ordered[3];
   const row4 = ordered[4];
 
-  const attentionRows = props.activities.filter(
+  const attentionRows = activities.filter(
     (row) => row.phase === "waiting_for_approval" || row.phase === "waiting_for_input",
   );
   const attentionRow = attentionRows[0];
-  const failedRow = props.activities.find((row) => row.phase === "failed");
+  const failedRow = activities.find((row) => row.phase === "failed");
   const heroRow = attentionRow ?? failedRow ?? row0;
   const tint = phaseTint(heroRow?.phase);
   // Headline count leans on the accent when a human is actually blocked.
@@ -141,12 +151,20 @@ export function AgentActivity(
   // the two parts in-line so the attention half can carry the accent color;
   // `summary` is the short form for tight spots (expanded center, watch card).
   const agentWord = props.activeCount === 1 ? "agent" : "agents";
-  const agentsLabel = allDone ? outcomeLabel : `${props.activeCount} active ${agentWord}`;
+  const agentsLabel = allDone
+    ? outcomeLabel
+    : environment.isStale
+      ? "Agent status out of date"
+      : `${props.activeCount} active ${agentWord}`;
   const attentionSuffix =
     attentionRows.length > 0
       ? `${attentionRows.length} need${attentionRows.length === 1 ? "s" : ""} attention`
       : "";
-  const activeLabel = allDone ? doneLabel : `${props.activeCount} active`;
+  const activeLabel = allDone
+    ? doneLabel
+    : environment.isStale
+      ? "Out of date"
+      : `${props.activeCount} active`;
   const summary = attentionSuffix || activeLabel;
 
   // Any registered scheme variant routes back to this app; taps are delivered