diff --git a/wecom-message-processor.js b/wecom-message-processor.js
index 88df410..0f409eb 100755
--- a/wecom-message-processor.js
+++ b/wecom-message-processor.js
@@ -287,7 +287,9 @@
   const isGroupChat = chatType === "group" && chatId;
 
   const isAIBotStreamRequest = message.stream && message.stream.id; // AI Bot stream refresh
-  const isSelfBuiltAppRequest = !isAIBotStreamRequest && !message.responseUrl; // Heuristic: no stream id and no response_url means self-built
+  const isSelfBuiltAppRequest = message.isSelfBuiltAppRequest !== undefined 
+      ? message.isSelfBuiltAppRequest 
+      : (!isAIBotStreamRequest && !message.responseUrl); // Heuristic fallback
 
   const peerId = isGroupChat ? chatId : senderId;
   const peerKind = isGroupChat ? "group" : "dm";