diff --git a/apps/desktop-shell/scripts/check-config.mjs b/apps/desktop-shell/scripts/check-config.mjs
index e6245ba9b..cf10f570d 100644
--- a/apps/desktop-shell/scripts/check-config.mjs
+++ b/apps/desktop-shell/scripts/check-config.mjs
@@ -2511,16 +2511,25 @@ for (const snippet of [
   'WINDOW_TITLE_MAX_LENGTH',
   'normalize_window_title',
   'window_title_from_request',
+  'window_title_unavailable_response',
   'required_string_payload(request, "title")',
   'window.set_title(&title)',
   '"title is required"',
+  '"window title unavailable"',
   'window_title_request_rejects_missing_or_invalid_payload',
   'window_title_request_trims_and_truncates_shared_boundary',
+  'window_title_unavailable_response_is_stable',
 ]) {
   if (!desktopHostBridgeTitleSource.includes(snippet)) {
     throw new Error(`desktop shell title module is missing ${snippet}`);
   }
 }
+if (
+  desktopHostBridgeTitleSource.includes('error.to_string()') ||
+  desktopHostBridgeTitleSource.includes('"main window not found"')
+) {
+  throw new Error('desktop shell title module must hide native window errors');
+}
 if (
   !desktopHostBridgeDispatchSource.includes(
     'show_desktop_local_notification(&app, &request)',
diff --git a/apps/desktop-shell/src-tauri/src/host_bridge/title.rs b/apps/desktop-shell/src-tauri/src/host_bridge/title.rs
index 43a6b0f45..23438947a 100644
--- a/apps/desktop-shell/src-tauri/src/host_bridge/title.rs
+++ b/apps/desktop-shell/src-tauri/src/host_bridge/title.rs
@@ -36,12 +36,16 @@ pub(crate) fn set_desktop_host_bridge_window_title(
     match app.get_webview_window("main") {
         Some(window) => match window.set_title(&title) {
             Ok(()) => ok(request.id.clone(), json!(true)),
-            Err(error) => failed(request.id.clone(), "host_error", error.to_string()),
+            Err(_) => window_title_unavailable_response(request),
         },
-        None => failed(request.id.clone(), "host_error", "main window not found"),
+        None => window_title_unavailable_response(request),
     }
 }
 
+fn window_title_unavailable_response(request: &HostBridgeRequest) -> HostBridgeResponse {
+    failed(request.id.clone(), "host_error", "window title unavailable")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -98,4 +102,14 @@ mod tests {
         assert_eq!(title.chars().count(), WINDOW_TITLE_MAX_LENGTH);
         assert!(title.chars().all(|character| character == '甲'));
     }
+
+    #[test]
+    fn window_title_unavailable_response_is_stable() {
+        let response = window_title_unavailable_response(&request("app.setTitle"));
+
+        assert!(!response.ok);
+        let error = response.error.expect("window title error");
+        assert_eq!(error.code, "host_error");
+        assert_eq!(error.message, "window title unavailable");
+    }
 }