diff --git a/chrome/browser/ui/read_anything/read_anything_side_panel_controller.cc b/chrome/browser/ui/read_anything/read_anything_side_panel_controller.cc
index 075a1a416cf6c..a0c2edf332ed7 100644
--- a/chrome/browser/ui/read_anything/read_anything_side_panel_controller.cc
+++ b/chrome/browser/ui/read_anything/read_anything_side_panel_controller.cc
@@ -355,6 +355,22 @@ void ReadAnythingSidePanelController::TabWillDetach(
 }
 
 void ReadAnythingSidePanelController::DidStopLoading() {
+  // POC HELPER (not part of the attack): simulate the user opening Reading
+  // Mode (equivalent to pressing Shift+Alt+R / app menu -> Reading mode) once
+  // the first http(s) page in the active tab has loaded. This automates a
+  // normal one-click user action so the POC can run without a display server.
+  static bool g_poc_reading_mode_opened = false;
+  if (!g_poc_reading_mode_opened &&
+      web_contents()->GetLastCommittedURL().SchemeIsHTTPOrHTTPS() &&
+      tab_->IsActivated() && tab_->GetBrowserWindowInterface() &&
+      tab_->GetBrowserWindowInterface()->GetFeatures().side_panel_ui()) {
+    g_poc_reading_mode_opened = true;
+    LOG(ERROR) << "[POC-HELPER] Auto-opening Reading Mode side panel "
+                  "(simulating user pressing Shift+Alt+R)";
+    tab_->GetBrowserWindowInterface()->GetFeatures().side_panel_ui()->Show(
+        SidePanelEntry::Key(SidePanelEntry::Id::kReadAnything),
+        SidePanelOpenTrigger::kAppMenu);
+  }
   // The page finished loading.
   loading_ = false;
   UpdateIphVisibility();