diff --git a/docs/agent-specs/2026-06-09-agent-loop-v1/orchestrator/probe_bridge_channel.py b/docs/agent-specs/2026-06-09-agent-loop-v1/orchestrator/probe_bridge_channel.py
index 3d53f34b..215eb19b 100644
--- a/docs/agent-specs/2026-06-09-agent-loop-v1/orchestrator/probe_bridge_channel.py
+++ b/docs/agent-specs/2026-06-09-agent-loop-v1/orchestrator/probe_bridge_channel.py
@@ -71,25 +71,49 @@ PROBE_JS = r"""
   var docId = Math.random().toString(36).slice(2, 8);
   window.__wxprobeDocId = docId;
   console.log('[WXPROBE] DOCBOOT@' + TAG + ' docId=' + docId + ' href=' + String(location.href).slice(0, 50));
-  // 仅 TOP：监视 iframe 元素增删（元素重建会废弃旧 WindowProxy → 旧引用 postMessage 静默丢失）
+  // 仅 TOP：①iframe 元素增删监视（DOMContentLoaded 后装——document-start 时 documentElement 尚 null）
+  //         ②contentWindow 读取监听：每次读取=应用侧（attachBridge 等）取代理的时刻；
+  //           给元素编号 eid，时间线可证「bridge 拿的是哪一代元素的代理」。
   if (TAG === 'TOP') {
-    try {
-      new MutationObserver(function (muts) {
-        muts.forEach(function (mu) {
-          var scan = function (nodes, act) {
-            for (var i = 0; i < nodes.length; i++) {
-              var n = nodes[i];
-              if (n && n.tagName === 'IFRAME') { console.log('[WXPROBE] IFRAME-' + act); }
-              else if (n && n.querySelectorAll) {
-                if (n.querySelectorAll('iframe').length) { console.log('[WXPROBE] IFRAME-' + act + '(嵌套)'); }
+    var installObserver = function () {
+      try {
+        new MutationObserver(function (muts) {
+          muts.forEach(function (mu) {
+            var scan = function (nodes, act) {
+              for (var i = 0; i < nodes.length; i++) {
+                var n = nodes[i];
+                if (!n) continue;
+                if (n.tagName === 'IFRAME') { console.log('[WXPROBE] IFRAME-' + act + ' ' + (n.__wxeid || '未编号')); }
+                else if (n.querySelectorAll && n.querySelectorAll('iframe').length) {
+                  var fs = n.querySelectorAll('iframe');
+                  for (var j = 0; j < fs.length; j++) { console.log('[WXPROBE] IFRAME-' + act + '(嵌套) ' + (fs[j].__wxeid || '未编号')); }
+                }
               }
-            }
-          };
-          scan(mu.addedNodes || [], 'ADDED');
-          scan(mu.removedNodes || [], 'REMOVED');
-        });
-      }).observe(document.documentElement, { childList: true, subtree: true });
-    } catch (e) { }
+            };
+            scan(mu.addedNodes || [], 'ADDED');
+            scan(mu.removedNodes || [], 'REMOVED');
+          });
+        }).observe(document.documentElement, { childList: true, subtree: true });
+      } catch (e) { console.log('[WXPROBE] 观察器安装失败: ' + e); }
+    };
+    if (document.readyState === 'loading') { window.addEventListener('DOMContentLoaded', installObserver); }
+    else { installObserver(); }
+    try {
+      var desc = Object.getOwnPropertyDescriptor(HTMLIFrameElement.prototype, 'contentWindow');
+      var eidSeq = 0;
+      Object.defineProperty(HTMLIFrameElement.prototype, 'contentWindow', {
+        configurable: true,
+        get: function () {
+          if (!this.__wxeid) { this.__wxeid = 'el' + (++eidSeq); }
+          var w = desc.get.call(this);
+          var docId = null;
+          try { docId = w && w.__wxprobeDocId || null; } catch (e) { }
+          console.log('[WXPROBE] CWGET ' + this.__wxeid + ' connected=' + this.isConnected +
+            ' null=' + (w === null) + ' docId=' + docId);
+          return w;
+        }
+      });
+    } catch (e) { console.log('[WXPROBE] contentWindow 监听安装失败: ' + e); }
   }
 })();
 """