diff --git a/src/codeinterpreterapi/brain/brain.py b/src/codeinterpreterapi/brain/brain.py
index 8a0d40bb..72482326 100644
--- a/src/codeinterpreterapi/brain/brain.py
+++ b/src/codeinterpreterapi/brain/brain.py
@@ -97,11 +97,16 @@ def prepare_input(self, input: Input):
                 del input['intermediate_steps']
 
         # set agent_results
-        input['agent_executor_result'] = self.agent_executor_result
-        input['plan_list'] = self.plan_list
-        input['supervisor_result'] = self.supervisor_result
-        input['thought_result'] = self.thought_result
-        input['crew_result'] = self.crew_result
+        if isinstance(input, list):
+            last_input = input[-1]
+        else:
+            last_input = input
+
+        last_input['agent_executor_result'] = self.agent_executor_result
+        last_input['plan_list'] = self.plan_list
+        last_input['supervisor_result'] = self.supervisor_result
+        last_input['thought_result'] = self.thought_result
+        last_input['crew_result'] = self.crew_result
         return input
 
     def run(self, input: Input, runnable_config: Optional[RunnableConfig] = None) -> Output:
diff --git a/src/codeinterpreterapi/crew/crew_agent.py b/src/codeinterpreterapi/crew/crew_agent.py
index eae7159f..1190ca4a 100644
--- a/src/codeinterpreterapi/crew/crew_agent.py
+++ b/src/codeinterpreterapi/crew/crew_agent.py
@@ -1,4 +1,4 @@
-from typing import Dict, List
+from typing import Dict, List, Union
 
 from crewai import Agent, Crew, Task
 
@@ -69,15 +69,26 @@ def create_task(self, final_goal: str, plan: CodeInterpreterPlan) -> Task:
         print("WARN: no task found plan.agent_name=", plan.agent_name)
         return None
 
-    def run(self, inputs: Dict, plan_list: CodeInterpreterPlanList):
+    def run(self, inputs: Union[Dict, List[Dict]], plan_list: CodeInterpreterPlanList):
         # update task description
         if plan_list is None:
             return {}
-        tasks = self.create_tasks(final_goal=inputs["input"], plan_list=plan_list)
-        crew_inputs = {"input": inputs.get("input", "")}
+
+        if isinstance(inputs, list):
+            last_input = inputs[-1]
+        else:
+            last_input = inputs
+        if "input" in inputs:
+            final_goal = last_input["input"]
+        elif "content" in inputs:
+            final_goal = last_input["content"]
+        else:
+            final_goal = "ユーザの指示に従って最終的な回答をしてください"
+
+        tasks = self.create_tasks(final_goal=final_goal, plan_list=plan_list)
         my_crew = Crew(agents=self.agents, tasks=tasks)
-        print("CodeInterpreterCrew.kickoff() crew_inputs=", crew_inputs)
-        result = my_crew.kickoff(inputs=crew_inputs)
+        print("CodeInterpreterCrew.kickoff() crew_inputs=", inputs)
+        result = my_crew.kickoff(inputs=inputs)
         return result
 
 
diff --git a/src/codeinterpreterapi/session.py b/src/codeinterpreterapi/session.py
index 85f6947b..0f9e24b0 100644
--- a/src/codeinterpreterapi/session.py
+++ b/src/codeinterpreterapi/session.py
@@ -19,7 +19,6 @@
 
 from codeinterpreterapi.brain.brain import CodeInterpreterBrain
 from codeinterpreterapi.brain.params import CodeInterpreterParams
-from codeinterpreterapi.callbacks.markdown.callbacks import MarkdownFileCallbackHandler
 from codeinterpreterapi.chains import aremove_download_link
 from codeinterpreterapi.chat_history import CodeBoxChatMessageHistory
 from codeinterpreterapi.config import settings
@@ -27,6 +26,8 @@
 from codeinterpreterapi.schema import CodeInterpreterResponse, File, SessionStatus, UserRequest
 from codeinterpreterapi.utils.multi_converter import MultiConverter
 
+BaseMessageContent = Union[str, List[Union[str, Dict]]]
+
 
 def _handle_deprecated_kwargs(kwargs: dict) -> None:
     settings.MODEL = kwargs.get("model", settings.MODEL)
@@ -105,7 +106,8 @@ def __init__(
         configurable = {"session_id": init_session_id}  # TODO: set session_id
         runnable_config = RunnableConfig(
             configurable=configurable,
-            callbacks=[AgentCallbackHandler(self._output_handler), MarkdownFileCallbackHandler("langchain_log.md")],
+            callbacks=[],
+            # callbacks=[AgentCallbackHandler(self._output_handler), MarkdownFileCallbackHandler("langchain_log.md")],
         )
 
         # ci_params = {}
@@ -199,34 +201,61 @@ def _history_backend(self) -> BaseChatMessageHistory:
             )
         )
 
-    def _input_handler(self, request: UserRequest) -> None:
+    def _input_message_prepare(self, request: UserRequest) -> None:
+        # set return input_message
+        if isinstance(request.content, str):
+            input_message = {"input": request.content, "agent_scratchpad": ""}
+        else:
+            input_message = request.content
+        return input_message
+
+    def _input_handler_common(self, request: UserRequest, add_content_str: str) -> None:
         """Callback function to handle user input."""
+        # TODO: variables as context to the agent
+        # TODO: current files as context to the agent
         if not request.files:
-            return
+            return self._input_message_prepare(request)
         if not request.content:
-            request.content = "I uploaded, just text me back and confirm that you got the file(s)."
-        assert isinstance(request.content, str), "TODO: implement image support"
-        request.content += "\n**The user uploaded the following files: **\n"
+            add_content_str = "I uploaded, just text me back and confirm that you got the file(s).\n" + add_content_str
+        assert isinstance(request.content, BaseMessageContent)  # "TODO: implement image support"
+
+        # set request.content
+        if isinstance(request.content, str):
+            request.content += add_content_str
+        elif isinstance(request.content, list):
+            last_content = request.content[-1]
+            if isinstance(last_content, str):
+                last_content += add_content_str
+            else:
+                pass
+                # TODO impl it.
+                # last_content["input"] += add_content_str
+        else:
+            # Dict
+            pass
+            # TODO impl it.
+            # request.content["input"] += add_content_str
+        return self._input_message_prepare(request)
+
+    def _input_handler(self, request: UserRequest) -> None:
+        """Callback function to handle user input."""
+        add_content_str = "\n**The user uploaded the following files: **\n"
         for file in request.files:
             self.input_files.append(file)
-            request.content += f"[Attachment: {file.name}]\n"
+            add_content_str += f"[Attachment: {file.name}]\n"
             self.ci_params.codebox.upload(file.name, file.content)
-        request.content += "**File(s) are now available in the cwd. **\n"
+        add_content_str += "**File(s) are now available in the cwd. **\n"
+        return self._input_handler_common(request, add_content_str)
 
     async def _ainput_handler(self, request: UserRequest) -> None:
-        # TODO: variables as context to the agent
-        # TODO: current files as context to the agent
-        if not request.files:
-            return
-        if not request.content:
-            request.content = "I uploaded, just text me back and confirm that you got the file(s)."
-        assert isinstance(request.content, str), "TODO: implement image support"
-        request.content += "\n**The user uploaded the following files: **\n"
+        """Callback function to handle user input."""
+        add_content_str = "\n**The user uploaded the following files: **\n"
         for file in request.files:
             self.input_files.append(file)
-            request.content += f"[Attachment: {file.name}]\n"
+            add_content_str += f"[Attachment: {file.name}]\n"
             await self.ci_params.codebox.aupload(file.name, file.content)
-        request.content += "**File(s) are now available in the cwd. **\n"
+        add_content_str += "**File(s) are now available in the cwd. **\n"
+        return self._input_handler_common(request, add_content_str)
 
     def _output_handler_pre(self, response: Any) -> str:
         print("_output_handler_pre response(type)=", type(response))
@@ -304,7 +333,7 @@ async def _aoutput_handler(self, response: str) -> CodeInterpreterResponse:
 
     def generate_response_sync(
         self,
-        user_msg: str,
+        user_msg: BaseMessageContent,
         files: list[File] = [],
     ) -> CodeInterpreterResponse:
         print("DEPRECATION WARNING: Use generate_response for sync generation.\n")
@@ -315,16 +344,16 @@ def generate_response_sync(
 
     def generate_response(
         self,
-        user_msg: str,
-        files: list[File] = [],
+        user_msg: BaseMessageContent,
+        files: list[File] = None,
     ) -> CodeInterpreterResponse:
         """Generate a Code Interpreter response based on the user's input."""
+        if files is None:
+            files = []
         user_request = UserRequest(content=user_msg, files=files)
         try:
-            self._input_handler(user_request)
+            input_message = self._input_handler(user_request)
             print("generate_response type(user_request.content)=", type(user_request.content))
-            agent_scratchpad = ""
-            input_message = {"input": user_request.content, "agent_scratchpad": agent_scratchpad}
             # ======= ↓↓↓↓ LLM invoke ↓↓↓↓ #=======
             response = self.brain.invoke(input=input_message)
             # ======= ↑↑↑↑ LLM invoke ↑↑↑↑ #=======
@@ -348,15 +377,15 @@ def generate_response(
 
     async def agenerate_response(
         self,
-        user_msg: str,
+        user_msg: BaseMessageContent,
         files: list[File] = None,
     ) -> CodeInterpreterResponse:
         """Generate a Code Interpreter response based on the user's input."""
         if files is None:
-            files = None
+            files = []
         user_request = UserRequest(content=user_msg, files=files)
         try:
-            await self._ainput_handler(user_request)
+            input_message = await self._ainput_handler(user_request)
             agent_scratchpad = ""
             input_message = {"input": user_request.content, "agent_scratchpad": agent_scratchpad}
             # ======= ↓↓↓↓ LLM invoke ↓↓↓↓ #=======
@@ -380,7 +409,7 @@ async def agenerate_response(
 
     def generate_response_stream(
         self,
-        user_msg: str,
+        user_msg: BaseMessageContent,
         files: list[File] = None,
     ) -> Iterator[str]:
         """Generate a Code Interpreter response based on the user's input."""
@@ -388,10 +417,7 @@ def generate_response_stream(
             files = []
         user_request = UserRequest(content=user_msg, files=files)
         try:
-            self._input_handler(user_request)
-            agent_scratchpad = ""
-            input_message = {"input": user_request.content, "agent_scratchpad": agent_scratchpad}
-            print("generate_response_stream type(user_request.content)=", user_request.content)
+            input_message = self._input_handler(user_request)
             # ======= ↓↓↓↓ LLM invoke ↓↓↓↓ #=======
             response_stream = self.brain.stream(input=input_message)
             # ======= ↑↑↑↑ LLM invoke ↑↑↑↑ #=======
@@ -417,7 +443,7 @@ def generate_response_stream(
 
     async def agenerate_response_stream(
         self,
-        user_msg: str,
+        user_msg: BaseMessageContent,
         files: list[File] = None,
     ) -> AsyncGenerator[CodeInterpreterResponse, None]:
         """Generate a Code Interpreter response based on the user's input."""