diff --git a/robot-server/robot_server/runs/router/labware_router.py b/robot-server/robot_server/runs/router/labware_router.py
index 7eba96afa0e..16924fd4ae8 100644
--- a/robot-server/robot_server/runs/router/labware_router.py
+++ b/robot-server/robot_server/runs/router/labware_router.py
@@ -16,7 +16,6 @@
     RequestModel,
     SimpleBody,
     PydanticResponse,
-    ResponseList,
 )
 
 from ..run_models import Run, LabwareDefinitionSummary
@@ -86,7 +85,7 @@ async def add_labware_offset(
     ),
     status_code=status.HTTP_201_CREATED,
     responses={
-        status.HTTP_201_CREATED: {"model": SimpleBody[Run]},
+        status.HTTP_201_CREATED: {"model": SimpleBody[LabwareDefinitionSummary]},
         status.HTTP_404_NOT_FOUND: {"model": ErrorBody[RunNotFound]},
         status.HTTP_409_CONFLICT: {"model": ErrorBody[Union[RunStopped, RunNotIdle]]},
     },
@@ -134,14 +133,14 @@ async def add_labware_definition(
         " Repeated definitions will be deduplicated."
     ),
     responses={
-        status.HTTP_200_OK: {"model": SimpleBody[Run]},
+        status.HTTP_200_OK: {"model": SimpleBody[list[SD_LabwareDefinition]]},
         status.HTTP_409_CONFLICT: {"model": ErrorBody[RunStopped]},
     },
 )
 async def get_run_loaded_labware_definitions(
     runId: str,
     run_data_manager: Annotated[RunDataManager, Depends(get_run_data_manager)],
-) -> PydanticResponse[SimpleBody[ResponseList[SD_LabwareDefinition]]]:
+) -> PydanticResponse[SimpleBody[list[SD_LabwareDefinition]]]:
     """Get a run's loaded labware definition by the run ID.
 
     Args:
@@ -155,8 +154,7 @@ async def get_run_loaded_labware_definitions(
     except RunNotCurrentError as e:
         raise RunStopped(detail=str(e)).as_error(status.HTTP_409_CONFLICT) from e
 
-    labware_definitions_result = ResponseList.construct(__root__=labware_definitions)
     return await PydanticResponse.create(
-        content=SimpleBody.construct(data=labware_definitions_result),
+        content=SimpleBody.construct(data=labware_definitions),
         status_code=status.HTTP_200_OK,
     )
diff --git a/robot-server/robot_server/service/json_api/__init__.py b/robot-server/robot_server/service/json_api/__init__.py
index 2680c99049f..78a9deeaa4d 100644
--- a/robot-server/robot_server/service/json_api/__init__.py
+++ b/robot-server/robot_server/service/json_api/__init__.py
@@ -14,7 +14,6 @@
     DeprecatedResponseDataModel,
     ResourceModel,
     PydanticResponse,
-    ResponseList,
     NotifyRefetchBody,
     NotifyUnsubscribeBody,
 )
@@ -44,7 +43,6 @@
     "DeprecatedResponseDataModel",
     "DeprecatedResponseModel",
     "DeprecatedMultiResponseModel",
-    "ResponseList",
     # notify models
     "NotifyRefetchBody",
     "NotifyUnsubscribeBody",
diff --git a/robot-server/robot_server/service/json_api/response.py b/robot-server/robot_server/service/json_api/response.py
index e1e422f255c..8764d8edd53 100644
--- a/robot-server/robot_server/service/json_api/response.py
+++ b/robot-server/robot_server/service/json_api/response.py
@@ -278,12 +278,6 @@ class DeprecatedMultiResponseModel(
     )
 
 
-class ResponseList(BaseModel, Generic[ResponseDataT]):
-    """A response that returns a list resource."""
-
-    __root__: List[ResponseDataT]
-
-
 class NotifyRefetchBody(BaseResponseBody):
     """A notification response that returns a flag for refetching via HTTP."""
 
diff --git a/robot-server/tests/runs/router/test_labware_router.py b/robot-server/tests/runs/router/test_labware_router.py
index 9a38ce6cd0f..1e3b929446d 100644
--- a/robot-server/tests/runs/router/test_labware_router.py
+++ b/robot-server/tests/runs/router/test_labware_router.py
@@ -169,7 +169,7 @@ async def test_get_run_labware_definition(
         runId="run-id", run_data_manager=mock_run_data_manager
     )
 
-    assert result.content.data.__root__ == [
+    assert result.content.data == [
         SD_LabwareDefinition.construct(namespace="test_1"),  # type: ignore[call-arg]
         SD_LabwareDefinition.construct(namespace="test_2"),  # type: ignore[call-arg]
     ]