diff --git a/apps/objectos-one/src-tauri/assets/notification-bridge.js b/apps/objectos-one/src-tauri/assets/notification-bridge.js
new file mode 100644
index 0000000..c9b942e
--- /dev/null
+++ b/apps/objectos-one/src-tauri/assets/notification-bridge.js
@@ -0,0 +1,144 @@
+// Native OS notification bridge for ObjectOS One.
+//
+// Injected into every page of the main webview (alongside update-banner.js).
+// Activates only on the Console — where the in-app inbox lives — and only
+// inside Tauri. It polls the in-app inbox and, when the window is in the
+// background, surfaces each NEW message as a native OS notification (macOS
+// Notification Center / Windows toast / Linux libnotify) and badges the dock
+// with the count missed while away (cleared on focus).
+//
+// Source of truth is `sys_inbox_message` (ADR-0030 L5) — the same table the
+// Console bell reads. The dedicated `/api/v1/notifications` route isn't mounted
+// in this runtime, so we read the canonical inbox object via the data API.
+//
+// All native work goes through Rust commands (`notify_native`, `set_badge`,
+// `notif_request_permission`) via `core.invoke` — matching this app's pattern.
+// `withGlobalTauri` only exposes `core`/`event`, NOT the plugin/window JS APIs,
+// so we must not call `__TAURI__.notification`/`.window`/`.app` directly.
+(function () {
+  if (window.__objectosNotifyBridge) return;
+  // Only on the Console (its login/app routes live under /_console), and only
+  // when the Tauri bridge is present (no-op in a plain browser).
+  if (!/\/_console(\/|$)/.test(location.pathname)) return;
+  if (!window.__TAURI__ || !window.__TAURI__.core) return;
+  window.__objectosNotifyBridge = true;
+
+  var invoke = window.__TAURI__.core.invoke;
+  var INBOX_URL = '/api/v1/data/sys_inbox_message?sort=-created_at&limit=25';
+  var POLL_MS = 20000;
+  var SEEN_KEY = '__objectos_notif_seen_v1';
+  var MAX_SEEN = 500;
+
+  var baselined = false; // first successful poll adopts the backlog silently
+  var inFlight = false;
+  var fatal = false; // inbox object absent → stop
+  var unseen = 0; // count surfaced while backgrounded, cleared on focus
+
+  function loadSeen() {
+    try {
+      return new Set(JSON.parse(localStorage.getItem(SEEN_KEY) || '[]'));
+    } catch (_) {
+      return new Set();
+    }
+  }
+  function saveSeen(set) {
+    try {
+      var arr = Array.from(set);
+      if (arr.length > MAX_SEEN) arr = arr.slice(arr.length - MAX_SEEN);
+      localStorage.setItem(SEEN_KEY, JSON.stringify(arr));
+    } catch (_) {}
+  }
+  var seen = loadSeen();
+
+  // Surface only when the user isn't actively looking at the window.
+  function backgrounded() {
+    return document.visibilityState === 'hidden' || !document.hasFocus();
+  }
+
+  function notify(title, body) {
+    try {
+      return invoke('notify_native', { title: title || 'Notification', body: body || '' });
+    } catch (_) {}
+  }
+  function setBadge(count) {
+    try {
+      return invoke('set_badge', { count: count > 0 ? count : null });
+    } catch (_) {}
+  }
+
+  // sys_inbox_message → the minimal shape we need for a toast.
+  function view(row) {
+    return {
+      id: row && row.id,
+      title: (row && row.title) || (row && row.topic) || 'Notification',
+      body: (row && (row.body_md || row.body)) || '',
+      createdAt: (row && row.created_at) || '',
+    };
+  }
+
+  async function poll() {
+    if (fatal || inFlight) return;
+    inFlight = true;
+    try {
+      var res = await fetch(INBOX_URL, {
+        headers: { accept: 'application/json' },
+        credentials: 'same-origin',
+      });
+      if (res.status === 401) return; // not signed in yet
+      if (res.status === 404) { fatal = true; return; } // no inbox object
+      if (!res.ok) return;
+
+      var json = await res.json();
+      var rows = (json && (json.records || json.items || json.data)) || [];
+      // Oldest-first so a burst toasts in chronological order.
+      var list = rows
+        .map(view)
+        .filter(function (v) { return v.id; })
+        .sort(function (a, b) {
+          return String(a.createdAt).localeCompare(String(b.createdAt));
+        });
+      var fresh = list.filter(function (v) { return !seen.has(v.id); });
+      if (!fresh.length) return;
+
+      if (!baselined) {
+        // First poll after a (re)load: adopt existing messages as baseline so
+        // we don't replay the backlog as a burst of toasts.
+        fresh.forEach(function (v) { seen.add(v.id); });
+        baselined = true;
+      } else {
+        var allowed = backgrounded();
+        fresh.forEach(function (v) {
+          seen.add(v.id);
+          if (allowed) {
+            notify(v.title, String(v.body).slice(0, 240));
+            unseen += 1;
+          }
+        });
+        if (allowed && unseen > 0) setBadge(unseen);
+      }
+      saveSeen(seen);
+    } catch (_) {
+      // transient (offline, mid-navigation) — retry next tick
+    } finally {
+      inFlight = false;
+    }
+  }
+
+  function onForeground() {
+    // The user is looking now — clear the "missed while away" badge.
+    unseen = 0;
+    setBadge(0);
+    poll();
+  }
+
+  // Ask once up front, in the foreground, so the OS prompt isn't sprung from
+  // the background.
+  try { invoke('notif_request_permission'); } catch (_) {}
+
+  poll();
+  setInterval(poll, POLL_MS);
+  document.addEventListener('visibilitychange', function () {
+    if (document.visibilityState === 'visible') onForeground();
+  });
+  window.addEventListener('focus', onForeground);
+})();
diff --git a/apps/objectos-one/src-tauri/src/commands.rs b/apps/objectos-one/src-tauri/src/commands.rs
index 31eb8ad..35394bc 100644
--- a/apps/objectos-one/src-tauri/src/commands.rs
+++ b/apps/objectos-one/src-tauri/src/commands.rs
@@ -2,12 +2,46 @@
 
 use std::collections::BTreeMap;
 
-use tauri::{AppHandle, Emitter};
+use tauri::{AppHandle, Emitter, Manager};
 use tauri_plugin_autostart::ManagerExt;
+use tauri_plugin_notification::NotificationExt;
 use tauri_plugin_opener::OpenerExt;
 
 use crate::{config, logger, paths, sidecar};
 
+/// Post a native OS notification (macOS Notification Center / Windows toast /
+/// Linux libnotify). Invoked by the injected notification bridge when a new
+/// inbox message arrives while the window is backgrounded.
+#[tauri::command]
+pub fn notify_native(app: AppHandle, title: String, body: String) -> Result<(), String> {
+    logger::log_line("INFO", "native notification surfaced");
+    app.notification()
+        .builder()
+        .title(title)
+        .body(body)
+        .show()
+        .map_err(|e| e.to_string())
+}
+
+/// Set (or clear, with `None`) the dock/taskbar unread badge.
+#[tauri::command]
+pub fn set_badge(app: AppHandle, count: Option<i64>) -> Result<(), String> {
+    if let Some(win) = app.get_webview_window("main") {
+        win.set_badge_count(count).map_err(|e| e.to_string())?;
+    }
+    Ok(())
+}
+
+/// Ask the OS for notification authorization (no-op once the user has decided).
+/// Called once when the Console loads, so the prompt appears in the foreground.
+#[tauri::command]
+pub fn notif_request_permission(app: AppHandle) -> Result<(), String> {
+    app.notification()
+        .request_permission()
+        .map(|_| ())
+        .map_err(|e| e.to_string())
+}
+
 #[tauri::command]
 pub fn get_config_snapshot() -> config::ConfigSnapshot {
     config::snapshot()
diff --git a/apps/objectos-one/src-tauri/src/lib.rs b/apps/objectos-one/src-tauri/src/lib.rs
index e5a016e..b77d3e5 100644
--- a/apps/objectos-one/src-tauri/src/lib.rs
+++ b/apps/objectos-one/src-tauri/src/lib.rs
@@ -46,6 +46,9 @@ pub fn run() {
             commands::open_data_dir,
             commands::autostart_get,
             commands::autostart_set,
+            commands::notify_native,
+            commands::set_badge,
+            commands::notif_request_permission,
         ])
         .setup(|app| {
             let handle = app.handle().clone();
diff --git a/apps/objectos-one/src-tauri/src/windows.rs b/apps/objectos-one/src-tauri/src/windows.rs
index d30ee3f..9082583 100644
--- a/apps/objectos-one/src-tauri/src/windows.rs
+++ b/apps/objectos-one/src-tauri/src/windows.rs
@@ -19,15 +19,23 @@ use crate::{logger::log_line, sidecar};
 /// otherwise discard the splash page's listeners).
 const UPDATE_BANNER_JS: &str = include_str!("../assets/update-banner.js");
 
+/// Mirrors the Console's in-app inbox to native OS notifications when the
+/// window is backgrounded (and keeps the dock badge in sync). Injected into
+/// every page; it no-ops outside the Console and outside Tauri.
+const NOTIFICATION_BRIDGE_JS: &str = include_str!("../assets/notification-bridge.js");
+
 pub fn build_main(app: &AppHandle) -> tauri::Result<()> {
     let app_handle = app.clone();
+    // Combine the injected bootstrap scripts into one so both reliably run on
+    // every page the webview loads.
+    let bootstrap = format!("{UPDATE_BANNER_JS}\n{NOTIFICATION_BRIDGE_JS}");
     let _win = WebviewWindowBuilder::new(app, "main", WebviewUrl::App("index.html".into()))
         .title("ObjectOS")
         .inner_size(1280.0, 820.0)
         .min_inner_size(960.0, 600.0)
         .resizable(true)
         .center()
-        .initialization_script(UPDATE_BANNER_JS)
+        .initialization_script(bootstrap.as_str())
         .on_navigation(move |url| {
             if is_external_link(url) {
                 use tauri_plugin_opener::OpenerExt;