diff --git a/backend/middlewares.py b/backend/middlewares.py
index 5f699d2..b6ccfa2 100644
--- a/backend/middlewares.py
+++ b/backend/middlewares.py
@@ -115,8 +115,8 @@ async def on_model_call(
                 logger.error("[ModelRetry] Fallback model also failed: %s", fallback_exc)
                 raise fallback_exc from last_exc
 
-        # 无回退模型，抛出最后一个异常
-        raise last_exc  # type: ignore[misc]
+        # 无回退模型，抛出最后一个异常（or 兜底满足静态分析：循环至少执行一次时 last_exc 必非 None）
+        raise last_exc or RuntimeError("ModelRetry: model call failed before any attempt was made")
 
 
 # ---------------------------------------------------------------------------
diff --git a/backend/services/orchestrator.py b/backend/services/orchestrator.py
index 78418d3..73e6d23 100644
--- a/backend/services/orchestrator.py
+++ b/backend/services/orchestrator.py
@@ -740,15 +740,13 @@ async def execute(
                 spec = spec_map[sid]
                 dep_outputs = [completed_outputs[dep] for dep in resolved_deps[sid]]
 
-                # 依赖传递由 Leader 控制：摘要而非原文
-                task_input = user_input
+                # 依赖传递由 Leader 控制：摘要而非原文；无依赖时直接用任务描述
+                task_input = spec.description
                 if dep_outputs:
                     summarized = await self._summarize_dependency_output(
                         dep_outputs, spec.description
                     )
                     task_input = f"## Background Context\n{summarized}\n\n## Your Task\n{spec.description}"
-                else:
-                    task_input = spec.description
 
                 ready_tasks.append((subtask, task_input))
 
diff --git a/backend/tests/services/test_team_tools.py b/backend/tests/services/test_team_tools.py
index a5ea70b..3d93c12 100644
--- a/backend/tests/services/test_team_tools.py
+++ b/backend/tests/services/test_team_tools.py
@@ -12,14 +12,15 @@
 
 class TestTeamEventType:
     def test_all_values_are_str(self):
-        for e in TeamEventType:
+        # 通过 __members__ 显式取成员，规避 CodeQL 无法识别 Enum 类可迭代的误报
+        for e in TeamEventType.__members__.values():
             assert isinstance(e.value, str)
             assert e == e.value  # str enum
 
     def test_expected_members(self):
         expected = {"team_created", "team_dissolved", "worker_spawned",
                     "worker_message", "worker_completed", "worker_dismissed"}
-        assert {e.value for e in TeamEventType} == expected
+        assert {e.value for e in TeamEventType.__members__.values()} == expected
 
 
 class TestTeamEventPayload: