diff --git a/app/modules/wechatclawbot/wechatclawbot.py b/app/modules/wechatclawbot/wechatclawbot.py
index 7c0f65ed..d8282c06 100644
--- a/app/modules/wechatclawbot/wechatclawbot.py
+++ b/app/modules/wechatclawbot/wechatclawbot.py
@@ -1238,23 +1238,32 @@ class ILinkClient:
     def _extract_updates(
         self, payload: Dict[str, Any]
     ) -> Tuple[List[Dict[str, Any]], Optional[str]]:
-        """按官方 getupdates 协议提取顶层 msgs 与 get_updates_buf。"""
-        sync_buf = self._pick_present_value(payload, ["get_updates_buf"])
+        """
+        提取轮询结果中的消息列表与游标。
+
+        线上存在两种等价字段命名：较新的实现返回 `get_updates_buf`，
+        部分实例仍然返回 `sync_buf`。两者都表示下一轮轮询应携带的游标。
+        """
+        sync_buf = self._pick_present_value(
+            payload, ["get_updates_buf", "sync_buf", "syncBuf"]
+        )
         items = payload.get("msgs")
         if isinstance(items, list):
             return items, sync_buf
         return [], sync_buf
 
-    def _has_canonical_poll_shape(self, payload: Dict[str, Any]) -> bool:
+    @staticmethod
+    def _has_canonical_poll_shape(payload: Dict[str, Any]) -> bool:
         """官方响应至少应包含顶层 msgs 列表。"""
         return isinstance(payload.get("msgs"), list)
 
-    def _is_poll_success(self, payload: Dict[str, Any]) -> bool:
+    def _resolve_poll_success(self, payload: Dict[str, Any]) -> Optional[bool]:
         """
-        判断 getupdates 是否明确成功。
+        判断 getupdates 是否给出了明确的成功/失败信号。
 
         轮询接口不能沿用“只要没有明显报错就算成功”的宽松策略，否则服务端返回旧消息列表、
         但状态码其实失败时，会被误判为可消费响应，导致旧消息再次进入业务链路。
+        返回 `None` 表示响应里没有显式状态，需要交给协议结构继续判断。
         """
         if not payload:
             return False
@@ -1286,7 +1295,7 @@ class ILinkClient:
                 return True
             if lowered in {"failed", "fail", "error", "denied", "blocked"}:
                 return False
-        return False
+        return None
 
     def _build_poll_result(
         self,
@@ -1320,16 +1329,22 @@ class ILinkClient:
         if not self.bot_token:
             return [], self.sync_buf, {"success": False, "message": "bot token 未配置"}
         url = f"{self.base_url}/ilink/bot/getupdates"
-        payload = {}
         request_body = self._with_base_info({"get_updates_buf": self.sync_buf or ""})
         resp = RequestUtils(
             headers=self._headers(auth_required=True),
             timeout=timeout_seconds + 10,
         ).post(url, json=request_body)
         payload = self._json(resp)
-        success = bool(payload and self._is_poll_success(payload))
+        explicit_success = self._resolve_poll_success(payload)
+        has_canonical_shape = self._has_canonical_poll_shape(payload)
+        # 某些 iLink 部署不会返回 ret/success，但顶层 msgs + sync_buf 已经足够表明
+        # 这是一次有效的轮询响应；只有出现显式失败信号时才应拒绝消费。
+        success = bool(payload) and (
+            explicit_success is True
+            or (explicit_success is None and has_canonical_shape)
+        )
         last_message = None
-        if payload and not success:
+        if payload and explicit_success is False:
             last_message = self._find_first_value(
                 payload, ["errmsg", "message", "error", "error_msg", "detail"]
             ) or self._short_text(payload)
@@ -1344,7 +1359,7 @@ class ILinkClient:
                 payload=payload,
                 message=last_message or "轮询响应未明确成功",
             )
-        if not self._has_canonical_poll_shape(payload):
+        if not has_canonical_shape:
             logger.warning(
                 "getupdates 返回非官方结构，已拒绝消费: %s",
                 self._short_text(payload),
@@ -1592,7 +1607,8 @@ class WechatClawBot:
             return "image/gif"
         return "application/octet-stream"
 
-    def _load_remote_image(self, image: str) -> Optional[bytes]:
+    @staticmethod
+    def _load_remote_image(image: str) -> Optional[bytes]:
         image_url = str(image or "").strip()
         if not image_url:
             return None
diff --git a/tests/test_wechatclawbot.py b/tests/test_wechatclawbot.py
index e3d7cb9c..599fc369 100644
--- a/tests/test_wechatclawbot.py
+++ b/tests/test_wechatclawbot.py
@@ -108,6 +108,33 @@ class WechatClawBotTest(unittest.TestCase):
         self.assertEqual(client.sync_buf, "")
         self.assertEqual(len(messages), 1)
 
+    def test_ilink_poll_updates_accepts_canonical_payload_without_explicit_success_flag(self):
+        client = ILinkClient(
+            base_url="https://ilinkai.weixin.qq.com",
+            bot_token="token",
+            sync_buf="cursor-old",
+        )
+        response = MagicMock()
+        response.json.return_value = {
+            "sync_buf": "cursor-new",
+            "msgs": [
+                {
+                    "message_id": "msg-1002",
+                    "from_user_id": "wxid_user_2",
+                    "item_list": [{"type": 1, "text_item": {"text": "收到"}}],
+                }
+            ],
+        }
+
+        with patch("app.modules.wechatclawbot.wechatclawbot.RequestUtils.post", return_value=response):
+            messages, sync_buf, result = client.poll_updates()
+
+        self.assertTrue(result["success"])
+        self.assertEqual(sync_buf, "cursor-new")
+        self.assertEqual(client.sync_buf, "cursor-new")
+        self.assertEqual(len(messages), 1)
+        self.assertEqual(messages[0].text, "收到")
+
     def test_ilink_poll_updates_rejects_noncanonical_nested_success_payload(self):
         client = ILinkClient(
             base_url="https://ilinkai.weixin.qq.com",