diff --git a/tests/unit/types/test_types_utils.py b/tests/unit/types/test_types_utils.py
index c032e3f3ddf..84349300a17 100644
--- a/tests/unit/types/test_types_utils.py
+++ b/tests/unit/types/test_types_utils.py
@@ -1,9 +1,25 @@
 import json
-from typing import Final
+from typing import Final, Protocol, cast
 
 import pytest
 
-
+from litellm.litellm_core_utils.hidden_params import HIDDEN_PARAMS_ATTR
+from litellm.types.agents import (
+    AgentCreateResponse,
+    AgentDeleteResult,
+    AgentListResponse,
+    AgentVersionsResponse,
+    LiteLLMSendMessageResponse,
+)
+from litellm.types.containers.main import ContainerFileObject, ContainerObject
+from litellm.types.google_genai.main import GenerateContentResponse
+from litellm.types.interactions.generated import (
+    CancelInteractionResult,
+    DeleteInteractionResult,
+    InteractionsAPIResponse,
+    InteractionsAPIStreamingResponse,
+)
+from litellm.types.responses.main import DeleteResponseResult
 from litellm.types.utils import (
     EmbeddingResponse,
     HiddenParams,
@@ -16,6 +32,14 @@ from litellm.types.utils import (
 )
 
 
+class _DictHiddenParamsAccessor(Protocol):
+    @property
+    def hidden_params(self) -> dict[str, object]: ...
+
+    @hidden_params.setter
+    def hidden_params(self, hidden_params: dict[str, object]) -> None: ...
+
+
 def test_rust_is_a_known_litellm_param():
     assert "rust" in all_litellm_params
 
@@ -47,6 +71,35 @@ def test_hidden_params_public_accessor_preserves_identity_and_instance_isolation
     assert response.hidden_params is replacement
 
 
+@pytest.mark.parametrize(
+    "response",
+    (
+        AgentCreateResponse.model_construct(),
+        AgentDeleteResult.model_construct(),
+        AgentListResponse.model_construct(),
+        AgentVersionsResponse.model_construct(),
+        LiteLLMSendMessageResponse.model_construct(),
+        ContainerObject.model_construct(),
+        ContainerFileObject.model_construct(),
+        GenerateContentResponse(),
+        InteractionsAPIResponse.model_construct(),
+        InteractionsAPIStreamingResponse.model_construct(),
+        DeleteInteractionResult.model_construct(),
+        CancelInteractionResult.model_construct(),
+        DeleteResponseResult.model_construct(),
+    ),
+)
+def test_hidden_params_public_accessor_updates_its_backing_storage(
+    response: _DictHiddenParamsAccessor,
+) -> None:
+    current: Final = response.hidden_params
+    assert cast(object, getattr(response, HIDDEN_PARAMS_ATTR)) is current
+
+    replacement: Final = {"replacement": "visible"}
+    response.hidden_params = replacement
+    assert cast(object, getattr(response, HIDDEN_PARAMS_ATTR)) is replacement
+
+
 def test_chat_completion_delta_tool_call():
     from litellm.types.utils import ChatCompletionDeltaToolCall, Function