diff --git a/lang_agent/graphs/react.py b/lang_agent/graphs/react.py
index 3cdf125..6282325 100644
--- a/lang_agent/graphs/react.py
+++ b/lang_agent/graphs/react.py
@@ -1,6 +1,7 @@
 from dataclasses import dataclass, field, is_dataclass
 from typing import Type, List, Callable, Any
 import tyro
+import jax
 
 from lang_agent.config import KeyConfig
 from lang_agent.tool_manager import ToolManager, ToolManagerConfig
@@ -49,7 +50,7 @@ class ReactGraph(GraphBase):
         tools = self.tool_manager.get_langchain_tools()
         self.agent = create_agent(self.llm, tools, checkpointer=memory)
     
-    def invoke(self, *nargs, as_stream:bool=False, **kwargs):
+    def invoke(self, *nargs, as_stream:bool=False, as_raw:bool=False, **kwargs):
         """
         as_stream (bool): for debug only, gets the agent to print its thoughts
         """
@@ -61,4 +62,7 @@ class ReactGraph(GraphBase):
         else:
             out = self.agent.invoke(*nargs, **kwargs)
 
-        return out
+        if as_raw:
+            return out
+        else:
+            return jax.tree.leaves(out)[-1].content
diff --git a/lang_agent/graphs/routing.py b/lang_agent/graphs/routing.py
index e303879..85948c1 100644
--- a/lang_agent/graphs/routing.py
+++ b/lang_agent/graphs/routing.py
@@ -61,7 +61,7 @@ class RoutingGraph(GraphBase):
         self.workflow = self._build_graph()
     
 
-    def invoke(self, *nargs, as_stream:bool=False, as_raw:bool=False, **kwargs):
+    def invoke(self, *nargs, as_stream:bool=False, as_raw:bool=False, **kwargs)->str:
         self._validate_input(*nargs, **kwargs)
 
         if as_stream:
@@ -81,7 +81,7 @@ class RoutingGraph(GraphBase):
         if as_raw:
             return msg_list
 
-        return msg_list[-1].content
+        return msg_list[-1].content 
     
     def _validate_input(self, *nargs, **kwargs):
         assert len(nargs[0]["messages"]) >= 2, "need at least 1 system and 1 human message"
diff --git a/lang_agent/pipeline.py b/lang_agent/pipeline.py
index 67de96b..12c72bc 100644
--- a/lang_agent/pipeline.py
+++ b/lang_agent/pipeline.py
@@ -117,7 +117,7 @@ class Pipeline:
         return f"ws://{self.config.host}:{self.config.port}"
     
 
-    def chat(self, inp:str, as_stream:bool=False)->str:
+    def chat(self, inp:str, as_stream:bool=False, as_raw:bool=False)->str:
         u = """
         你叫小盏，是一个点餐助手，你的回复要简洁明了，不需要给用户提供选择。对话过程中不要出现提示用户下一步的操作，用可爱的语气进行交流，根据用户的语言使用对应的语言回答
 
@@ -142,7 +142,7 @@ class Pipeline:
         inp = {"messages":[SystemMessage(u),
                            HumanMessage(inp)]}, {"configurable": {"thread_id": 3}}
 
-        out = self.invoke(*inp, as_stream=as_stream)
+        out = self.invoke(*inp, as_stream=as_stream, as_raw=as_raw)
 
         # return out['messages'][-1].content
         return out
\ No newline at end of file