fix: isolate startup tools and preview dialogs

backend/tests/test_brains.py

@@ -246,6 +246,55 @@ class DifyLLMServiceTests(unittest.IsolatedAsyncioTestCase):
 
 
 class PromptBrainTests(unittest.IsolatedAsyncioTestCase):
+    async def test_startup_only_tool_is_not_registered_with_llm(self):
+        startup_tool = RuntimeTool(
+            id="opening_message",
+            name="开场确认",
+            function_name="show_message",
+            type="client",
+        )
+        conversation_tool = RuntimeTool(
+            id="lookup_order",
+            name="查询订单",
+            function_name="lookup_order",
+            type="http",
+        )
+        cfg = AssistantConfig(
+            type="prompt",
+            tools=[startup_tool, conversation_tool],
+            llm_tool_ids=[conversation_tool.id],
+            startup={
+                "actions": [
+                    {
+                        "id": "opening_message",
+                        "phase": "opening",
+                        "tool_id": startup_tool.id,
+                        "required": True,
+                    }
+                ]
+            },
+        )
+        brain = build_brain(cfg)
+        llm = FakeLLM()
+        visible_schemas = []
+
+        await brain.setup(
+            cfg,
+            BrainRuntime(
+                context=LLMContext(messages=[]),
+                llm=llm,
+                queue_frame=noop_queue_frame,
+                set_system_prompt=lambda _prompt: None,
+                set_tools=visible_schemas.extend,
+                call_end=FakeCallEnd(),
+            ),
+        )
+
+        self.assertIn(startup_tool.id, brain._tool_by_id)
+        self.assertNotIn(startup_tool.function_name, llm.functions)
+        self.assertIn(conversation_tool.function_name, llm.functions)
+        self.assertEqual(len(visible_schemas), 1)
+
     async def test_preflight_runs_multiple_server_tools_in_order(self):
         tools = [
             RuntimeTool(