diff --git a/starpilot/system/the_galaxy/tests/test_sentry_push_and_routing.py b/starpilot/system/the_galaxy/tests/test_sentry_push_and_routing.py
index 63f73d089..7bb42bab0 100644
--- a/starpilot/system/the_galaxy/tests/test_sentry_push_and_routing.py
+++ b/starpilot/system/the_galaxy/tests/test_sentry_push_and_routing.py
@@ -62,6 +62,26 @@ def test_slug_middleware_service_worker_and_headers(client):
     assert response_direct.headers.get("Service-Worker-Allowed") == "/"
 
 
+def test_mobile_manifest_embeds_device_slug_for_fresh_app_login(client):
+  galaxy_dir = the_galaxy._get_galaxy_dir()
+  galaxy_dir.mkdir(parents=True, exist_ok=True)
+  (galaxy_dir / "glxyslug").write_text("df70390ca648d7c3")
+
+  response = client.get("/assets/mobile/manifest.json")
+
+  assert response.status_code == 200
+  assert response.mimetype == "application/manifest+json"
+  assert response.get_json()["start_url"] == "https://galaxy.firestar.link/df70390ca648d7c3"
+  assert "no-store" in response.headers.get("Cache-Control", "")
+
+
+def test_mobile_manifest_falls_back_to_local_mobile_route_without_slug(client):
+  response = client.get("/assets/mobile/manifest.json")
+
+  assert response.status_code == 200
+  assert response.get_json()["start_url"] == "/mobile/"
+
+
 def test_404_api_returns_json_not_html(client):
   # Non-existent API route without slug
   res1 = client.get("/api/nonexistent")
diff --git a/starpilot/system/the_galaxy/the_galaxy.py b/starpilot/system/the_galaxy/the_galaxy.py
index 5837736ab..fda7d7b16 100644
--- a/starpilot/system/the_galaxy/the_galaxy.py
+++ b/starpilot/system/the_galaxy/the_galaxy.py
@@ -5301,6 +5301,27 @@ def setup(app):
       return "Settings catalog not found", 404
     return send_file(str(SETTINGS_CATALOG_PATH), mimetype="application/json")
 
+  @app.route("/assets/mobile/manifest.json", methods=["GET"])
+  def mobile_manifest():
+    manifest_path = Path(app.static_folder) / "mobile" / "manifest.json"
+    if not manifest_path.is_file():
+      return jsonify({"error": "Big Dipper manifest not found"}), 404
+
+    try:
+      manifest_data = json.loads(manifest_path.read_text(encoding="utf-8"))
+    except (OSError, ValueError, json.JSONDecodeError):
+      return jsonify({"error": "Big Dipper manifest is invalid"}), 500
+
+    slug = _read_galaxy_text(_get_galaxy_dir() / "glxyslug")
+    if re.fullmatch(r"[A-Za-z0-9]{16}", slug):
+      manifest_data["start_url"] = f"https://galaxy.firestar.link/{slug}"
+    else:
+      manifest_data["start_url"] = "/mobile/"
+
+    response = jsonify(manifest_data)
+    response.mimetype = "application/manifest+json"
+    return _no_store_response(response)
+
   @app.route("/manifest.json", methods=["GET"])
   @app.route("/assets/manifest.json", methods=["GET"])
   def manifest():