diff --git a/ts/types.ts b/ts/types.ts
index 8f2f2cc..23eba5a 100644
--- a/ts/types.ts
+++ b/ts/types.ts
@@ -184,6 +184,9 @@ export type UINodeType =
 
 export interface UINode {
   type: UINodeType;
+  /** Surface 层节点级标注（Generative UI U2）：整页唯一稳定 id 与事实来源标识，旧路径不填。 */
+  id?: string;
+  source?: string[];
   title?: string;
   items?: string[];
   kv?: [string, string][];