diff --git a/src/api_specs/dtos/memory.py b/src/api_specs/dtos/memory.py
index 4b5a6f57..2b46e994 100644
--- a/src/api_specs/dtos/memory.py
+++ b/src/api_specs/dtos/memory.py
@@ -284,6 +284,10 @@ class MemorizeRequest(BaseModel):
     # Optional extraction control parameters
     enable_foresight_extraction: bool = True  # Whether to extract foresight
     enable_event_log_extraction: bool = True  # Whether to extract event logs
+    force_boundary: bool = Field(
+        default=False,
+        description="Force the extraction of a new memcell",
+    )
 
     model_config = {"arbitrary_types_allowed": True}
 
@@ -340,6 +344,10 @@ class MemorizeMessageRequest(BaseModel):
         description="List of referenced message IDs",
         examples=[["msg_000"]],
     )
+    force_boundary: bool = Field(
+        default=False,
+        description="Force the extraction of a new memcell",
+    )
 
     @model_validator(mode="after")
     def validate_role(self):
diff --git a/src/api_specs/request_converter.py b/src/api_specs/request_converter.py
index b59438f0..d602ce91 100644
--- a/src/api_specs/request_converter.py
+++ b/src/api_specs/request_converter.py
@@ -420,4 +420,5 @@ async def convert_simple_message_to_memorize_request(
         group_id=group_id,
         group_name=group_name,
         current_time=timestamp,
+        force_boundary=message_data.get("force_boundary", False),
     )
diff --git a/src/biz_layer/mem_memorize.py b/src/biz_layer/mem_memorize.py
index e951a13c..068e245b 100644
--- a/src/biz_layer/mem_memorize.py
+++ b/src/biz_layer/mem_memorize.py
@@ -1317,6 +1317,8 @@ async def memorize(request: MemorizeRequest) -> int:
         request.group_id,
         request.group_name,
         request.user_id_list,
+        old_memory_list=None,
+        force_boundary=request.force_boundary,
     )
     record_extraction_stage(
         space_id=space_id,
diff --git a/src/memory_layer/memcell_extractor/conv_memcell_extractor.py b/src/memory_layer/memcell_extractor/conv_memcell_extractor.py
index 881628e4..96b821b3 100644
--- a/src/memory_layer/memcell_extractor/conv_memcell_extractor.py
+++ b/src/memory_layer/memcell_extractor/conv_memcell_extractor.py
@@ -49,7 +49,7 @@ class BoundaryDetectionResult:
 
 @dataclass
 class ConversationMemCellExtractRequest(MemCellExtractRequest):
-    pass
+    force_boundary: bool = False
 
 
 class ConvMemCellExtractor(MemCellExtractor):
@@ -478,7 +478,15 @@ async def extract_memcell(
             )
 
         # === Normal LLM-based boundary detection ===
-        if request.smart_mask_flag:
+        if getattr(request, 'force_boundary', False):
+            boundary_detection_result = BoundaryDetectionResult(
+                should_end=True,
+                should_wait=False,
+                reasoning="Force boundary requested by API client payload",
+                confidence=1.0,
+                topic_summary="",
+            )
+        elif request.smart_mask_flag:
             boundary_detection_result = await self._detect_boundary(
                 conversation_history=history_message_dict_list[:-1],
                 new_messages=new_message_dict_list,
diff --git a/src/memory_layer/memory_manager.py b/src/memory_layer/memory_manager.py
index e1af421e..14350b40 100644
--- a/src/memory_layer/memory_manager.py
+++ b/src/memory_layer/memory_manager.py
@@ -81,6 +81,7 @@ async def extract_memcell(
         group_name: Optional[str] = None,
         user_id_list: Optional[List[str]] = None,
         old_memory_list: Optional[List[BaseMemory]] = None,
+        force_boundary: bool = False,
     ) -> tuple[Optional[MemCell], Optional[StatusResult]]:
         """
         Extract MemCell (boundary detection + raw data)
@@ -115,6 +116,7 @@ async def extract_memcell(
             group_name=group_name,
             old_memory_list=old_memory_list,
             smart_mask_flag=smart_mask_flag,
+            force_boundary=force_boundary,
         )
 
         extractor = ConvMemCellExtractor(self.llm_provider)