diff --git a/tests/test_dispatcher.py b/tests/test_dispatcher.py
index 8ddc865..4ed66e9 100644
--- a/tests/test_dispatcher.py
+++ b/tests/test_dispatcher.py
@@ -184,10 +184,12 @@ class TestDispatch:
 
 class TestConcurrencyControl:
     def test_counter_busy_skips(self, dispatcher, task_pending):
-        """Agent 忙 → skip"""
-        mock_counter = MagicMock()
-        mock_counter.can_acquire = AsyncMock(return_value=False)
-        dispatcher.counter = mock_counter
+        """Agent 忙 → skip（v2.8 #07: AgentBusyError 从 spawn_full_agent 抛出）"""
+        mock_spawner = MagicMock()
+        mock_spawner.spawn_full_agent = AsyncMock(
+            side_effect=AgentBusyError("zhangfei-dev", reason="counter_blocked")
+        )
+        dispatcher.spawner = mock_spawner
 
         result = asyncio.run(dispatcher.dispatch(task_pending))
         assert result["status"] == "skipped"