feat: add session-scoped client tool waits

backend/tests/test_brains.py

@@ -518,6 +518,42 @@ class PromptBrainTests(unittest.IsolatedAsyncioTestCase):
 
 
 class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
+    def test_client_tool_session_wait_disables_flow_timeout(self):
+        brain = WorkflowBrain(
+            {
+                "specVersion": 3,
+                "settings": {},
+                "nodes": [{"id": "start", "type": "start", "data": {}}],
+                "edges": [],
+            }
+        )
+        timeout_tool = RuntimeTool(
+            id="client_timeout",
+            name="限时等待",
+            function_name="wait_with_timeout",
+            type="client",
+            definition={
+                "type": "client",
+                "config": {"timeout_seconds": 7},
+            },
+        )
+        session_tool = RuntimeTool(
+            id="client_session",
+            name="会话内等待",
+            function_name="wait_for_session",
+            type="client",
+            definition={
+                "type": "client",
+                "config": {
+                    "timeout_seconds": 7,
+                    "response_wait_mode": "session",
+                },
+            },
+        )
+
+        self.assertEqual(brain._flow_tool(timeout_tool, "start").timeout_secs, 7.0)
+        self.assertIsNone(brain._flow_tool(session_tool, "start").timeout_secs)
+
     async def test_session_update_refreshes_current_agent_without_routing(self):
         cfg = prepare_dynamic_config(
             AssistantConfig(