diff --git a/crates/bridge-core/tests/sessions.rs b/crates/bridge-core/tests/sessions.rs
index 89669c3..1b90f40 100644
--- a/crates/bridge-core/tests/sessions.rs
+++ b/crates/bridge-core/tests/sessions.rs
@@ -456,6 +456,71 @@ fn close_session_ends_it_tombstones_it_and_forgets_its_transcript() {
     assert!(rig.transcripts.entries(&s).is_empty());
 }
 
+#[test]
+fn closing_sessions_in_a_row_ends_each_and_late_host_events_bring_none_back() {
+    let mut rig = Rig::new();
+    rig.host_up();
+    let ready: Vec<String> = ["alpha", "beta", "alpha"].iter().map(|a| rig.ready_session(a)).collect();
+    for s in &ready {
+        rig.say(s, "x");
+    }
+    // One more that the host has not answered yet: closed while starting.
+    rig.send(json!({"type":"create-session","agent":"alpha"}));
+    let (start_id, starting) = rig.start_request();
+    rig.take();
+
+    let mut all = ready.clone();
+    all.push(starting.session_id.clone());
+    for s in &all {
+        rig.send(json!({"type":"close-session","sessionId":s}));
+    }
+
+    let ended: Vec<String> = rig
+        .host_frames()
+        .into_iter()
+        .filter_map(|f| match f.message {
+            BridgeMessage::EndSession { session_id } => Some(session_id),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(ended, all, "every session is ended in the host, the starting one included");
+    rig.advance(5_000);
+    let msgs = rig.messages();
+    let acked: Vec<&str> = msgs
+        .iter()
+        .filter_map(|m| match m {
+            BridgeToPhone::CloseSessionAck(a) if a.success => Some(a.session_id.as_str()),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(acked, all.iter().map(String::as_str).collect::<Vec<_>>());
+    let hb = last_heartbeat(&msgs);
+    assert!(hb.sessions.is_empty());
+    let mut removed = hb.removed_sessions.clone().unwrap_or_default();
+    removed.sort();
+    let mut expected = all.clone();
+    expected.sort();
+    assert_eq!(removed, expected);
+
+    // What the host still had in flight arrives after the closes.
+    rig.host_reply(&start_id, HostMessage::Ack);
+    rig.host_event(&starting.session_id, SessionEvent::Ready {});
+    rig.say(&ready[0], "late");
+    rig.host_event(&ready[1], SessionEvent::Ended { error: None, resume_lost: false });
+    rig.advance(5_000);
+    let msgs = rig.messages();
+    assert!(outputs(&msgs).is_empty(), "no output of a closed session reaches the phone");
+    if let Some(hb) = msgs.iter().rev().find_map(|m| match m {
+        BridgeToPhone::Sessions(h) => Some(h),
+        _ => None,
+    }) {
+        assert!(hb.sessions.is_empty(), "a closed session came back: {:?}", hb.sessions);
+    }
+    for s in &all {
+        assert!(rig.transcripts.entries(s).is_empty());
+    }
+}
+
 #[test]
 fn shutdown_publishes_every_session_offline_and_stops() {
     let mut rig = Rig::new();
diff --git a/crates/client-runtime/src/runtime.rs b/crates/client-runtime/src/runtime.rs
index 52da0e7..a525a83 100644
--- a/crates/client-runtime/src/runtime.rs
+++ b/crates/client-runtime/src/runtime.rs
@@ -948,6 +948,14 @@ impl Loop {
                 }
                 Msg::Pause => {
                     // Backgrounded: the OS may kill the process from here on.
+                    // A delete still in its undo window is committed now —
+                    // its toast is out of sight, and the window lives only
+                    // in memory: a process killed before it closed would
+                    // never send the `close-session`, and the session would
+                    // come back once its dismissal expired.
+                    if self.stores.delete_controller.is_pending() {
+                        self.on_undo_timer().await;
+                    }
                     self.flush_acks();
                     self.flush_writes().await;
                     self.ws.set_ping_interval(BACKGROUND_PING_EVERY);
diff --git a/crates/client-runtime/src/runtime/tests.rs b/crates/client-runtime/src/runtime/tests.rs
index 0236847..751b1c9 100644
--- a/crates/client-runtime/src/runtime/tests.rs
+++ b/crates/client-runtime/src/runtime/tests.rs
@@ -1758,6 +1758,108 @@ async fn the_undo_toast_clears_itself_when_the_window_expires_without_a_tap() {
         .await;
 }
 
+/// A heartbeat listing `ids` for the machine of the session-delete test.
+fn heartbeat_listing(ids: &[&str]) -> BridgeToPhone {
+    let sessions: Vec<serde_json::Value> = ids
+        .iter()
+        .map(|id| {
+            serde_json::json!({"id": id, "agent": "claude-code", "slug": id, "cwd": "/w",
+                "lastActivity": "t", "lineCount": 0, "title": null, "project": "p"})
+        })
+        .collect();
+    protocol::codec::decode_bridge_to_phone(
+        &serde_json::json!({
+            "type": "sessions",
+            "machine": "laptop",
+            "sessions": sessions,
+            "agents": [],
+            "protocolVersion": protocol::capabilities::PROTOCOL_VERSION,
+        })
+        .to_string(),
+    )
+    .unwrap()
+}
+
+/// Deleting sessions one after another: each delete commits the one before
+/// it at once (one `close-session` each), a heartbeat sent before the
+/// bridge has closed the later ones does not bring them back, and the
+/// last one — still in its undo window — is committed as soon as the app
+/// is backgrounded rather than lost with a killed process.
+#[tokio::test]
+async fn deleting_sessions_in_a_row_closes_each_one_exactly_once() {
+    LocalSet::new()
+        .run_until(async {
+            let mut mock = mock_relay().await;
+            let phone = keypair_from_secret_hex(SEC_PHONE).unwrap();
+            let machine = generate_keypair();
+            let mut state = client_core::stores::machines::MachinesState::default();
+            state.register_machine(&machine.pubkey_hex, "bridge", None, None, &[]);
+            let kv = MemoryKv::seeded([(
+                crate::stores::MACHINES_KEY,
+                client_core::stores::machines::serialize_machines(&state.machines),
+            )]);
+            let ports = CorePorts { kv: Rc::new(kv), ..CorePorts::default() };
+            let core = core_for_ports(&mock, &phone, Rc::new(Spy::default()), ports).await;
+            core.start();
+            eose_all(&mut mock).await;
+            let refresh = next_command_via(&mut mock, &phone, &phone.pubkey_hex, &machine).await;
+            assert!(matches!(refresh, Some(PhoneToBridge::RefreshSessions(_))), "{refresh:?}");
+
+            let listed = heartbeat_listing(&["s1", "s2", "s3"]);
+            push_bridge_to_phone_event(&mock, &machine, &phone.pubkey_hex, "cd-1", &listed);
+            settle().await;
+            let sessions = |view: MachinesView| -> Vec<String> {
+                view.machines[&machine.pubkey_hex].sessions.keys().cloned().collect()
+            };
+            assert_eq!(sessions(core.machines_view().await), ["s1", "s2", "s3"]);
+
+            for id in ["s1", "s2", "s3"] {
+                core.dispatch(Intent::DeleteSession {
+                    machine: machine.pubkey_hex.clone(),
+                    session_id: id.into(),
+                    label: None,
+                })
+                .await;
+            }
+            assert!(sessions(core.machines_view().await).is_empty());
+            let toast = core.ui_view().await.undo_toast.expect("the last delete is undoable");
+            assert_eq!(toast.session_id, "s3");
+
+            // s1 and s2 were committed by the delete that followed each.
+            let closed = |cmd: Option<PhoneToBridge>| match cmd {
+                Some(PhoneToBridge::CloseSession(m)) => m.session_id,
+                other => panic!("expected a close-session, got {other:?}"),
+            };
+            for id in ["s1", "s2"] {
+                assert_eq!(closed(next_command_via(&mut mock, &phone, &phone.pubkey_hex, &machine).await), id);
+            }
+
+            // The bridge has closed s1 only; its next list still has the
+            // other two, which must stay deleted on the phone.
+            let after_first = heartbeat_listing(&["s2", "s3"]);
+            push_bridge_to_phone_event(&mock, &machine, &phone.pubkey_hex, "cd-1", &after_first);
+            settle().await;
+            assert!(sessions(core.machines_view().await).is_empty());
+
+            // Backgrounded inside s3's undo window: committed now, well
+            // before the window would have run out.
+            core.pause();
+            let last = tokio::time::timeout(
+                std::time::Duration::from_millis(client_core::delete_controller::UNDO_DELAY_MS / 2),
+                next_command_via(&mut mock, &phone, &phone.pubkey_hex, &machine),
+            )
+            .await
+            .expect("the pending delete is sent when the app is backgrounded");
+            assert_eq!(closed(last), "s3");
+            assert!(core.ui_view().await.undo_toast.is_none());
+
+            // Nothing is left to undo, and nothing is sent twice.
+            core.dispatch(Intent::UndoDelete).await;
+            assert!(sessions(core.machines_view().await).is_empty());
+        })
+        .await;
+}
+
 /// The next command EVENT the identity `phone` signed for `machine`,
 /// with its payload decrypted as from `payload_key` (the phone's
 /// identity or its session key). Every EVENT is ACKed on the way.
diff --git a/packages/agent-host/src/drivers/deepseek/__tests__/deepseekDriver.test.ts b/packages/agent-host/src/drivers/deepseek/__tests__/deepseekDriver.test.ts
index 38d08b9..bfc5646 100644
--- a/packages/agent-host/src/drivers/deepseek/__tests__/deepseekDriver.test.ts
+++ b/packages/agent-host/src/drivers/deepseek/__tests__/deepseekDriver.test.ts
@@ -479,6 +479,24 @@ describe('DeepSeekSession lifecycle', () => {
     await vi.waitFor(() => expect(ready.harness.child.killed).toContain('SIGTERM'));
   });
 
+  it('closes sessions ended together one by one, and the shared process only after the last', async () => {
+    const ready = withDriver();
+    const sessions: DriverSession[] = [];
+    for (const sessionId of ['b1', 'b2', 'b3']) {
+      await started(ready, { sessionId });
+      sessions.push(ready.session);
+    }
+    expect(ready.spawns).toHaveLength(1);
+
+    await Promise.all([sessions[0]!.end(), sessions[1]!.end()]);
+    expect([...ready.harness.closed].sort()).toEqual(['s1', 's2']);
+    expect(ready.harness.child.killed).toEqual([]);
+
+    await Promise.all([sessions[2]!.end(), sessions[2]!.end()]);
+    expect([...ready.harness.closed].sort()).toEqual(['s1', 's2', 's3']);
+    await vi.waitFor(() => expect(ready.harness.child.killed).toContain('SIGTERM'));
+  });
+
   it('ends every session of a harness process that goes away', async () => {
     const ready = withDriver();
     const first = await started(ready, { sessionId: 'b1' });