diff --git a/client/src/cmbuyer_client/pdd/sku_selection.py b/client/src/cmbuyer_client/pdd/sku_selection.py
index e69253b..210c6d2 100644
--- a/client/src/cmbuyer_client/pdd/sku_selection.py
+++ b/client/src/cmbuyer_client/pdd/sku_selection.py
@@ -44,6 +44,43 @@ class SkuSelectionError(RuntimeError):
     """已取证判据不成立时的脱敏停止。"""
 
 
+_SKU_ENTRY_FAILURE_STAGES = frozenset(
+    (
+        "sku_entry_pre_intent",
+        "sku_entry_discovery",
+        "sku_entry_click",
+        "sku_entry_panel_verify",
+    )
+)
+_SKU_ENTRY_FAILURE_MARKER = object()
+
+
+def _annotate_sku_entry_failure(error: BaseException, stage: str) -> None:
+    """把 Flow 实际经过的固定入口子阶段附到原异常，不改变异常类型。"""
+
+    if type(stage) is not str or stage not in _SKU_ENTRY_FAILURE_STAGES:
+        return
+    try:
+        # marker 最后写入：若第三方异常拒绝任一属性写入，就不能形成可信诊断。
+        setattr(error, "_cmbuyer_failure_stage", stage)
+        setattr(error, "_cmbuyer_sku_entry_failure_marker", _SKU_ENTRY_FAILURE_MARKER)
+    except BaseException:
+        pass
+
+
+def _safe_sku_entry_failure_stage(error: BaseException) -> str | None:
+    """只读取由本模块写入的入口子阶段；任意异常自报的值不可信。"""
+
+    try:
+        marker = getattr(error, "_cmbuyer_sku_entry_failure_marker", None)
+        stage = getattr(error, "_cmbuyer_failure_stage", None)
+        if marker is not _SKU_ENTRY_FAILURE_MARKER or type(stage) is not str:
+            return None
+        return stage if stage in _SKU_ENTRY_FAILURE_STAGES else None
+    except BaseException:
+        return None
+
+
 class SkuPanelDevice(Protocol):
     def app_info(self, package_name: str) -> dict[str, Any]: ...
     def app_current(self) -> dict[str, Any]: ...
@@ -89,19 +126,38 @@ class SkuSelectionFlow:
         self._pending: tuple[str, Callable[[list[_Node]], Any]] | None = None
 
     def open_sku_panel(self, product_url: str, pre_intent_hierarchy: str | None = None) -> None:
-        if parse_product_url(product_url).goods_id != EXPECTED_GOODS_ID:
-            raise SkuSelectionError("商品不是已取证目标，已停止操作。")
-        if pre_intent_hierarchy is not None:
-            previous_nodes = _parse_nodes(pre_intent_hierarchy)
-            # intent 前只判断旧页是否已经存在完整入口链；浮层或额外动作节点不能把旧商品
-            # 伪装成“不安全所以不存在”，否则 intent 后可能误把旧页当成新目标页。
-            if _physical_entries(previous_nodes):
-                raise SkuSelectionError("intent 前页面已出现规格入口，已拒绝旧商品误点。")
-        entry, before = self._wait_for_entry(pre_intent_hierarchy)
-        _action_bounds(entry.bounds)
-        self._pending = (before, _panel)
-        self._device.tap_sku_entry(entry.bounds)
-        self._wait_after_action(before, _panel)
+        try:
+            if parse_product_url(product_url).goods_id != EXPECTED_GOODS_ID:
+                raise SkuSelectionError("商品不是已取证目标，已停止操作。")
+            if pre_intent_hierarchy is not None:
+                previous_nodes = _parse_nodes(pre_intent_hierarchy)
+                # intent 前只判断旧页是否已经存在完整入口链；浮层或额外动作节点不能把旧商品
+                # 伪装成“不安全所以不存在”，否则 intent 后可能误把旧页当成新目标页。
+                if _physical_entries(previous_nodes):
+                    raise SkuSelectionError("intent 前页面已出现规格入口，已拒绝旧商品误点。")
+        except BaseException as error:
+            _annotate_sku_entry_failure(error, "sku_entry_pre_intent")
+            raise
+
+        try:
+            entry, before = self._wait_for_entry(pre_intent_hierarchy)
+            _action_bounds(entry.bounds)
+        except BaseException as error:
+            _annotate_sku_entry_failure(error, "sku_entry_discovery")
+            raise
+
+        try:
+            self._pending = (before, _panel)
+            self._device.tap_sku_entry(entry.bounds)
+        except BaseException as error:
+            _annotate_sku_entry_failure(error, "sku_entry_click")
+            raise
+
+        try:
+            self._wait_after_action(before, _panel)
+        except BaseException as error:
+            _annotate_sku_entry_failure(error, "sku_entry_panel_verify")
+            raise
 
     def select_sku_options(self, selection: SkuSelection) -> None:
         if selection not in {SkuSelection(*item) for item in TASK_TO_UI_SELECTION.values()}:
diff --git a/client/src/cmbuyer_client/pdd/sku_selection_runner.py b/client/src/cmbuyer_client/pdd/sku_selection_runner.py
index c0f118a..2509143 100644
--- a/client/src/cmbuyer_client/pdd/sku_selection_runner.py
+++ b/client/src/cmbuyer_client/pdd/sku_selection_runner.py
@@ -30,7 +30,10 @@ from .sku_selection import (
     SkuPanelDevice,
     SkuSelectionError,
     SkuSelectionFlow,
+    _SKU_ENTRY_FAILURE_STAGES,
     _action_bounds,
+    _annotate_sku_entry_failure,
+    _safe_sku_entry_failure_stage,
     resolve_task_selection,
 )
 
@@ -48,6 +51,7 @@ _FAILURE_STAGES = frozenset(
         "device_session",
         "product_open",
         "sku_entry",
+        *_SKU_ENTRY_FAILURE_STAGES,
         "sku_selection",
         "price_verification",
         "screenshot_capture",
@@ -85,7 +89,11 @@ def safe_failure_stage(error: BaseException) -> str:
         stage = getattr(error, "_cmbuyer_failure_stage", None)
         # exact str 避免恶意 str 子类在 hash/eq 中执行任意异常；诊断路径
         # 自己也必须失败闭合，不能让异常正文越过 CLI 的统一脱敏出口。
-        return stage if type(stage) is str and stage in _FAILURE_STAGES else "unknown"
+        if type(stage) is not str or stage not in _FAILURE_STAGES:
+            return "unknown"
+        if stage in _SKU_ENTRY_FAILURE_STAGES:
+            return stage if _safe_sku_entry_failure_stage(error) == stage else "unknown"
+        return stage
     except BaseException:
         return "unknown"
 
@@ -101,6 +109,21 @@ def _annotate_failure(error: BaseException, stage: str) -> None:
         pass
 
 
+def _failure_stage_for(error: BaseException, runner_stage: str) -> str:
+    if runner_stage == "sku_entry":
+        flow_stage = _safe_sku_entry_failure_stage(error)
+        if flow_stage is not None:
+            return flow_stage
+    return runner_stage
+
+
+def _annotate_mapped_failure(mapped: BaseException, source: BaseException, runner_stage: str) -> None:
+    stage = _failure_stage_for(source, runner_stage)
+    if stage in _SKU_ENTRY_FAILURE_STAGES:
+        _annotate_sku_entry_failure(mapped, stage)
+    _annotate_failure(mapped, stage)
+
+
 @dataclass(frozen=True)
 class SkuSelectionRunResult:
     """已发布的截图和无页面正文 manifest 摘要。"""
@@ -299,22 +322,22 @@ class SkuSelectionRunner:
             staging = None
         except (DeviceConnectionError, ProductUrlError, SkuSelectionRunError, SkuSelectionError) as error:
             _clean_staging(staging)
-            _annotate_failure(error, stage)
+            _annotate_failure(error, _failure_stage_for(error, stage))
             raise
         except (AdbTimeout, HTTPTimeoutError, TimeoutError) as error:
             _clean_staging(staging)
             mapped = SkuSelectionRunTimeoutError("规格面板运行超时，未发布任何证据产物。")
-            _annotate_failure(mapped, stage)
+            _annotate_mapped_failure(mapped, error, stage)
             raise mapped from error
         except OSError as error:
             _clean_staging(staging)
             mapped = SkuSelectionRunError("规格面板证据目录无法创建或发布，未发布任何证据产物。")
-            _annotate_failure(mapped, stage)
+            _annotate_mapped_failure(mapped, error, stage)
             raise mapped from error
         except Exception as error:
             _clean_staging(staging)
             mapped = SkuSelectionRunError("规格面板运行未完成，未发布任何证据产物。")
-            _annotate_failure(mapped, stage)
+            _annotate_mapped_failure(mapped, error, stage)
             raise mapped from error
         finally:
             # 失败路径只能复用 Flow 的版本、前台和面板证明；证明不了便停止，绝不盲目返回。
diff --git a/client/tests/pdd/test_sku_selection.py b/client/tests/pdd/test_sku_selection.py
index b780077..68a5135 100644
--- a/client/tests/pdd/test_sku_selection.py
+++ b/client/tests/pdd/test_sku_selection.py
@@ -605,14 +605,17 @@ class SkuSelectionRunnerTests(unittest.TestCase):
                     return ""
                 return super().jsonrpc_call(method, params, timeout)
 
+        adb = _FakeAdb()
+        device = NoPanelAfterEntry("<hierarchy />")
+        adb.on_intent = lambda: setattr(device, "hierarchy", _PRODUCT_PAGE)
         with TemporaryDirectory() as temporary, self.assertRaises(SkuSelectionError) as raised:
-            self._runner(_FakeAdb(), NoPanelAfterEntry()).run(
+            SkuSelectionRunner(adb, lambda serial: device, 0.03).run(
                 "device-1", _TARGET_URL, _TASK_COLOR, _TASK_SIZE, Path(temporary) / "result"
             )
-        self.assertEqual(safe_failure_stage(raised.exception), "sku_entry")
+        self.assertEqual(safe_failure_stage(raised.exception), "sku_entry_panel_verify")
 
         forged = SkuSelectionError("<hierarchy>private</hierarchy>")
-        setattr(forged, "_cmbuyer_failure_stage", "<private-stage>")
+        setattr(forged, "_cmbuyer_failure_stage", "sku_entry_click")
         self.assertEqual(safe_failure_stage(forged), "unknown")
 
         class HostileSetterError(DeviceConnectionError):
@@ -629,6 +632,45 @@ class SkuSelectionRunnerTests(unittest.TestCase):
             )
         self.assertEqual(safe_failure_stage(hostile.exception), "unknown")
 
+    def test_failure_stage_identifies_sku_entry_pre_intent(self) -> None:
+        device = _RawDevice(_PRODUCT_PAGE)
+        with TemporaryDirectory() as temporary, self.assertRaises(SkuSelectionError) as raised:
+            SkuSelectionRunner(_FakeAdb(), lambda serial: device, 0.03).run(
+                "device-1", _TARGET_URL, _TASK_COLOR, _TASK_SIZE, Path(temporary) / "result"
+            )
+
+        self.assertEqual(safe_failure_stage(raised.exception), "sku_entry_pre_intent")
+        self.assertEqual(_actions(device, "click"), [])
+
+    def test_failure_stage_identifies_sku_entry_discovery(self) -> None:
+        device = _RawDevice("<hierarchy />")
+        with TemporaryDirectory() as temporary, self.assertRaises(SkuSelectionError) as raised:
+            SkuSelectionRunner(_FakeAdb(), lambda serial: device, 0.01).run(
+                "device-1", _TARGET_URL, _TASK_COLOR, _TASK_SIZE, Path(temporary) / "result"
+            )
+
+        self.assertEqual(safe_failure_stage(raised.exception), "sku_entry_discovery")
+        self.assertEqual(_actions(device, "click"), [])
+
+    def test_failure_stage_identifies_sku_entry_click(self) -> None:
+        class ClickFailureDevice(_RawDevice):
+            def jsonrpc_call(self, method: str, params: object = None, timeout: float = 10) -> str:
+                if method == "click":
+                    self.calls.append(("jsonrpc", method, params, timeout))
+                    raise TimeoutError("private device detail")
+                return super().jsonrpc_call(method, params, timeout)
+
+        adb = _FakeAdb()
+        device = ClickFailureDevice("<hierarchy />")
+        adb.on_intent = lambda: setattr(device, "hierarchy", _PRODUCT_PAGE)
+        with TemporaryDirectory() as temporary, self.assertRaises(SkuSelectionRunError) as raised:
+            SkuSelectionRunner(adb, lambda serial: device, 0.03).run(
+                "device-1", _TARGET_URL, _TASK_COLOR, _TASK_SIZE, Path(temporary) / "result"
+            )
+
+        self.assertEqual(safe_failure_stage(raised.exception), "sku_entry_click")
+        self.assertEqual(len(_actions(device, "click")), 1)
+
     def test_target_created_during_publish_is_preserved_without_staging_residue(self) -> None:
         with TemporaryDirectory() as temporary:
             target = Path(temporary) / "result"