diff --git a/metagpt/actions/di/detect_intent.py b/metagpt/actions/di/detect_intent.py
index 8f56f4ae8..d41317321 100644
--- a/metagpt/actions/di/detect_intent.py
+++ b/metagpt/actions/di/detect_intent.py
@@ -90,6 +90,8 @@ You should follow the following Standard Operating Procedure:
 
 class DetectIntent(Action):
     async def run(self, user_requirement: str) -> Tuple[str, str]:
+        if not isinstance(user_requirement, str):
+            raise ValueError(f"str type error: {user_requirement}")
         intentions = "\n".join([f"{si.type_name}: {si.value.description}" for si in SOPItem])
         prompt = DETECT_PROMPT.format(user_requirement=user_requirement, intentions=intentions)
 
diff --git a/metagpt/roles/di/mgx.py b/metagpt/roles/di/mgx.py
index b2caa930b..33377e5f1 100644
--- a/metagpt/roles/di/mgx.py
+++ b/metagpt/roles/di/mgx.py
@@ -16,7 +16,8 @@ class MGX(DataInterpreter):
 
     async def _detect_intent(self, user_msgs: List[Message] = None, **kwargs):
         todo = DetectIntent(context=self.context)
-        request_with_sop, sop_type = await todo.run(user_msgs)
+        user_requirement = "\n".join([f"> {i.role}: {i.content}" for i in user_msgs])
+        request_with_sop, sop_type = await todo.run(user_requirement)
         logger.info(f"{sop_type} {request_with_sop}")
         return request_with_sop