diff --git a/apps/desktop-shell/scripts/check-config.mjs b/apps/desktop-shell/scripts/check-config.mjs
index 38b85641b..b0fb9d741 100644
--- a/apps/desktop-shell/scripts/check-config.mjs
+++ b/apps/desktop-shell/scripts/check-config.mjs
@@ -2495,6 +2495,9 @@ for (const snippet of [
   'PermissionState::Prompt | PermissionState::PromptWithRationale',
   'desktop_notification_delivered_to_system_result',
   'json!({"action": HOST_BRIDGE_LOCAL_NOTIFICATION_DELIVERED_TO_SYSTEM_ACTION})',
+  'local_notification_payload_truncates_to_shared_contract_limits',
+  '"a".repeat(HOST_BRIDGE_LOCAL_NOTIFICATION_TITLE_MAX_LENGTH)',
+  '"b".repeat(HOST_BRIDGE_LOCAL_NOTIFICATION_BODY_MAX_LENGTH)',
   '"notification permission denied"',
   'app.notification().builder()',
 ]) {
diff --git a/apps/desktop-shell/src-tauri/src/host_bridge/notifications.rs b/apps/desktop-shell/src-tauri/src/host_bridge/notifications.rs
index ddb502ced..0adee5ccb 100644
--- a/apps/desktop-shell/src-tauri/src/host_bridge/notifications.rs
+++ b/apps/desktop-shell/src-tauri/src/host_bridge/notifications.rs
@@ -158,6 +158,21 @@ mod tests {
         assert_eq!(body.as_deref(), Some("作品已准备好 可以试玩"));
     }
 
+    #[test]
+    fn local_notification_payload_truncates_to_shared_contract_limits() {
+        let mut request = request("notification.showLocal");
+        request.payload = Some(json!({
+            "title": "a".repeat(90),
+            "body": "b".repeat(250)
+        }));
+
+        let (title, body) = local_notification_payload(&request).expect("payload");
+        let expected_body = "b".repeat(HOST_BRIDGE_LOCAL_NOTIFICATION_BODY_MAX_LENGTH);
+
+        assert_eq!(title, "a".repeat(HOST_BRIDGE_LOCAL_NOTIFICATION_TITLE_MAX_LENGTH));
+        assert_eq!(body.as_deref(), Some(expected_body.as_str()));
+    }
+
     #[test]
     fn local_notification_success_result_reports_system_delivery() {
         assert_eq!(