diff --git a/static/messages.js b/static/messages.js
index e72e8148..aec6e11c 100644
--- a/static/messages.js
+++ b/static/messages.js
@@ -8703,7 +8703,7 @@ function playAttentionSound(key){
 function _notificationOptions(body,options={}){
   const sid=(options&&options.sid)||(S&&S.session&&S.session.session_id);
   const url=sid?`${location.origin}${_sessionUrlForSid(sid)}`:location.href;
-  return {body:body||'',tag:sid?`hermes-${sid}`:'hermes-webui',renotify:false,icon:'static/favicon-192.png',badge:'static/favicon-32.png',data:{url}};
+  return {body:body||'',tag:sid?`hermes-${sid}`:'hermes-webui',renotify:true,icon:'static/favicon-192.png',badge:'static/favicon-32.png',data:{url}};
 }
 function _showPwaNotification(title,body,options={}){
   const botName=assistantDisplayName();
diff --git a/tests/test_6673_notification_renotify.py b/tests/test_6673_notification_renotify.py
new file mode 100644
index 00000000..bc3a952c
--- /dev/null
+++ b/tests/test_6673_notification_renotify.py
@@ -0,0 +1,94 @@
+"""Regression coverage for same-session notification toasts (#6673).
+
+Desktop notifications via the Notification API only pop a toast banner the
+first time for a given tag: on Windows the notification persists in the
+Action Center, and subsequent same-session turn completions produce no
+visible toast. The fix keeps the session-scoped `tag` (so stale
+notifications are still replaced in the notification center) but sets
+`renotify: true` so every turn completion re-pops a toast banner.
+"""
+
+import json
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+ROOT = Path(__file__).resolve().parents[1]
+MESSAGES_SRC = (ROOT / "static" / "messages.js").read_text(encoding="utf-8")
+NODE = shutil.which("node")
+
+pytestmark = pytest.mark.skipif(NODE is None, reason="node not on PATH")
+
+_DRIVER_SRC = r"""
+const fs = require('fs');
+const src = fs.readFileSync(process.argv[2], 'utf8');
+
+function extract(source, name) {
+  const start = source.indexOf('function ' + name + '(');
+  if (start === -1) throw new Error('function not found: ' + name);
+  const bodyStart = source.indexOf('){', start) + 1;
+  let depth = 0;
+  for (let i = bodyStart; i < source.length; i++) {
+    if (source[i] === '{') depth++;
+    else if (source[i] === '}') {
+      depth--;
+      if (depth === 0) return source.slice(start, i + 1);
+    }
+  }
+  throw new Error('function body did not close: ' + name);
+}
+
+// Stub the globals `_notificationOptions` touches so the extracted function
+// runs standalone: S (session state), location, and _sessionUrlForSid.
+let S = { session: { session_id: 'sess-6673' } };
+global.S = S;
+global.location = { origin: 'http://localhost:8080', href: 'http://localhost:8080/' };
+global._sessionUrlForSid = (sid) => '/#/s/' + sid;
+
+eval(extract(src, '_notificationOptions'));
+
+const withSid = _notificationOptions('Turn done', { sid: 'sess-6673' });
+// Fallback path: no options.sid AND no session in scope -> generic tag.
+S = null;
+const withoutSid = _notificationOptions('Turn done', {});
+console.log(JSON.stringify({
+  withSid: { renotify: withSid.renotify, tag: withSid.tag, body: withSid.body },
+  withoutSid: { renotify: withoutSid.renotify, tag: withoutSid.tag },
+}));
+"""
+
+
+def _run_driver(tmp_path) -> dict:
+    driver = tmp_path / "driver_6673.js"
+    driver.write_text(_DRIVER_SRC, encoding="utf-8")
+    result = subprocess.run(
+        [NODE, str(driver), str(ROOT / "static" / "messages.js")],
+        capture_output=True,
+        text=True,
+        timeout=30,
+    )
+    assert result.returncode == 0, f"node failed: {result.stderr}"
+    return json.loads(result.stdout)
+
+
+def test_same_session_notification_renotifies(tmp_path):
+    """#6673: a notification for a session-scoped tag must re-pop a toast on
+    every turn completion instead of being swallowed after the first pop."""
+    out = _run_driver(tmp_path)
+    assert out["withSid"]["renotify"] is True
+    assert out["withSid"]["body"] == "Turn done"
+
+
+def test_session_scoped_tag_is_preserved(tmp_path):
+    """The session-scoped tag stays so stale notifications are still replaced
+    in the notification center (no duplicate clutter)."""
+    out = _run_driver(tmp_path)
+    assert out["withSid"]["tag"] == "hermes-sess-6673"
+
+
+def test_fallback_tag_without_session(tmp_path):
+    out = _run_driver(tmp_path)
+    assert out["withoutSid"]["tag"] == "hermes-webui"
+    assert out["withoutSid"]["renotify"] is True