diff --git a/backend/package/yuxi/channels/application/transport/puller_worker.py b/backend/package/yuxi/channels/application/transport/puller_worker.py
index 76982a2c..17dc64a2 100644
--- a/backend/package/yuxi/channels/application/transport/puller_worker.py
+++ b/backend/package/yuxi/channels/application/transport/puller_worker.py
@@ -176,6 +176,26 @@ class PullerWorker(BaseTransportWorker):
                 continue
 
             if not result.messages:
+                # 适配器可能过滤了消息（如 wechat_woc 过滤本账号发送的回复），
+                # 此时 next_cursor 已基于全量消息前进。若不持久化，下次仍用旧
+                # cursor 拉取被过滤的消息，导致 cursor 卡死形成静默死循环
+                # （不触发 AgentRun 但无限轮询，且阻塞后续用户消息）。仅当
+                # next_cursor 非空且前进时持久化；无消息且 cursor 不变时保持
+                # 原行为（不写 DB），避免空轮询频繁持久化。
+                if result.next_cursor is not None and result.next_cursor != cursor:
+                    persisted = await self._saveCursor(
+                        channel_type,
+                        account_id,
+                        result.next_cursor,
+                        last_persisted_cursor,
+                        error_trace_id,
+                        expected_version=account_version,
+                    )
+                    if persisted:
+                        cursor = result.next_cursor
+                        last_persisted_cursor = result.next_cursor
+                    # 持久化失败时不进入退避重试（无消息非错误），用旧 cursor
+                    # 下次重新拉取，保证 at-least-once 语义。
                 task_info.backoff_attempt = 0
                 task_info.consecutive_successes += 1
                 if task_info.consecutive_successes == 1:
diff --git a/backend/package/yuxi/channels/plugins/wechat_woc/adapters/puller_adapter.py b/backend/package/yuxi/channels/plugins/wechat_woc/adapters/puller_adapter.py
index a3a35a4d..b5ff1a3e 100644
--- a/backend/package/yuxi/channels/plugins/wechat_woc/adapters/puller_adapter.py
+++ b/backend/package/yuxi/channels/plugins/wechat_woc/adapters/puller_adapter.py
@@ -180,6 +180,23 @@ class WeChatWocPullerAdapter:
             # create_time"严格区分，后者必须前进）
             next_cursor = cursor
 
+        # 过滤本账号发送的消息（is_sender 真值）。bridge /api/messages/since
+        # 返回会话内全部消息，含系统经 outbound 发送的回复；若不过滤，这些
+        # 回复会被当作用户消息重新拉入，触发 AgentRun → 新回复 → 再被回拉，
+        # 形成无限循环。游标已基于全量消息计算，过滤不影响前进（C-1）。
+        original_count = len(messages)
+        messages = [m for m in messages if not _is_self_sent(m)]
+        skipped_self = original_count - len(messages)
+        if skipped_self > 0:
+            await self._logger.debug(
+                "woc poll filtered self-sent messages",
+                account_id=account_id,
+                trace_id=trace_id,
+                original_count=original_count,
+                filtered_count=skipped_self,
+                remaining_count=len(messages),
+            )
+
         await self._logger.debug(
             "woc poll completed",
             account_id=account_id,
@@ -286,4 +303,26 @@ class WeChatWocPullerAdapter:
             raise DependencyError(dep="config", cause=exc) from exc
 
 
+def _is_self_sent(msg: dict) -> bool:
+    """判断消息是否为本账号发送（``is_sender`` 真值）。
+
+    bridge 契约返回 int ``0``/``1``（``0``=对方发送，``1``=本账号发送）。
+    兼容 bool 与 string 真值，显式排除 ``0``/``"0"``/``False`` 避免字符串
+    误判导致用户消息被丢弃（消息丢失比循环更严重）。
+
+    非 dict 输入返回 False（透传下游保持原有单条失败语义，避免在 poll
+    列表推导中抛异常导致整批消息丢失）。
+
+    @consistency: 无状态，纯函数。
+    """
+    if not isinstance(msg, dict):
+        return False
+    is_sender = msg.get("is_sender")
+    if is_sender is None or is_sender is False or is_sender == 0:
+        return False
+    if isinstance(is_sender, str):
+        return is_sender.strip().lower() in {"1", "true", "yes"}
+    return bool(is_sender)
+
+
 __all__ = ["WeChatWocPullerAdapter"]
diff --git a/backend/package/yuxi/channels/plugins/wechat_woc/adapters/stream_connector_adapter.py b/backend/package/yuxi/channels/plugins/wechat_woc/adapters/stream_connector_adapter.py
index d8115ba6..5aa61f6b 100644
--- a/backend/package/yuxi/channels/plugins/wechat_woc/adapters/stream_connector_adapter.py
+++ b/backend/package/yuxi/channels/plugins/wechat_woc/adapters/stream_connector_adapter.py
@@ -180,7 +180,14 @@ class WeChatWocStreamConnectorAdapter:
             while True:
                 # 缓冲队列有消息时优先返回，避免阻塞在读事件上
                 if not buffer.empty():
-                    return await buffer.get()
+                    msg = await buffer.get()
+                    # 过滤本账号发送的消息（is_sender 真值）。bridge SSE 推送
+                    # 含系统经 outbound 发送的回复；若不过滤，这些回复会被
+                    # 当作用户消息重新处理，触发 AgentRun → 新回复 → 再被
+                    # 推送，形成无限循环。游标由 sync 全局游标驱动，不受影响。
+                    if _is_self_sent(msg):
+                        continue
+                    return msg
 
                 try:
                     event = await anext(events_iter)
@@ -512,4 +519,24 @@ class WeChatWocStreamConnectorAdapter:
             raise DependencyError(dep="config", cause=exc) from exc
 
 
+def _is_self_sent(msg: dict) -> bool:
+    """判断消息是否为本账号发送（``is_sender`` 真值）。
+
+    bridge 契约返回 int ``0``/``1``（``0``=对方发送，``1``=本账号发送）。
+    兼容 bool 与 string 真值，显式排除 ``0``/``"0"``/``False`` 避免字符串
+    误判导致用户消息被丢弃。与 ``puller_adapter._is_self_sent`` 同逻辑
+    （跨模块不 import 私有函数，各自内联）。
+
+    @consistency: 无状态，纯函数。
+    """
+    if not isinstance(msg, dict):
+        return False
+    is_sender = msg.get("is_sender")
+    if is_sender is None or is_sender is False or is_sender == 0:
+        return False
+    if isinstance(is_sender, str):
+        return is_sender.strip().lower() in {"1", "true", "yes"}
+    return bool(is_sender)
+
+
 __all__ = ["WeChatWocStreamConnectorAdapter"]