diff --git a/litellm/types/utils.py b/litellm/types/utils.py
index 5f66ba1fd0a..9fc6350dddc 100644
--- a/litellm/types/utils.py
+++ b/litellm/types/utils.py
@@ -40,7 +40,7 @@ from pydantic import (
     field_validator,
     model_validator,
 )
-from typing_extensions import Required, TypedDict
+from typing_extensions import NotRequired, Required, TypedDict
 
 from litellm._uuid import uuid
 from litellm.types.llms.base import (
@@ -164,7 +164,7 @@ class AgenticLoopParams(TypedDict, total=False):
     custom_llm_provider: str
     """The LLM provider name (e.g., 'bedrock', 'anthropic')"""
 
-    api_key: str
+    api_key: NotRequired[Optional[str]]
     """Deployment-specific API key resolved by get_llm_provider() (optional).
 
     Stored so agentic follow-up calls (e.g. websearch interception) reuse the
@@ -172,7 +172,7 @@ class AgenticLoopParams(TypedDict, total=False):
     provider env vars.
     """
 
-    api_base: str
+    api_base: NotRequired[Optional[str]]
     """Deployment-specific API base URL resolved by get_llm_provider() (optional)."""
 
 
diff --git a/tests/test_litellm/llms/anthropic/experimental_pass_through/messages/test_anthropic_experimental_pass_through_messages_handler.py b/tests/test_litellm/llms/anthropic/experimental_pass_through/messages/test_anthropic_experimental_pass_through_messages_handler.py
index cd9589eaa7d..0a179aab789 100644
--- a/tests/test_litellm/llms/anthropic/experimental_pass_through/messages/test_anthropic_experimental_pass_through_messages_handler.py
+++ b/tests/test_litellm/llms/anthropic/experimental_pass_through/messages/test_anthropic_experimental_pass_through_messages_handler.py
@@ -530,7 +530,7 @@ def test_agentic_loop_params_preserves_dynamic_api_key_and_api_base():
         ),
         patch("litellm.completion", return_value="test-response"),
     ):
-        try:
+        with pytest.raises(Exception):
             anthropic_messages_handler(
                 max_tokens=100,
                 messages=[{"role": "user", "content": "hi"}],
@@ -540,8 +540,6 @@ def test_agentic_loop_params_preserves_dynamic_api_key_and_api_base():
                 api_base="https://my-proxy.example.com/v1",
                 litellm_logging_obj=logging_obj,
             )
-        except (ValueError, TypeError, AttributeError):
-            pass
 
     agentic_loop_params = logging_obj.model_call_details.get("agentic_loop_params")
     assert agentic_loop_params is not None
@@ -572,7 +570,7 @@ def test_agentic_loop_params_omits_keys_when_dynamic_values_are_none():
         ),
         patch("litellm.completion", return_value="test-response"),
     ):
-        try:
+        with pytest.raises(Exception):
             anthropic_messages_handler(
                 max_tokens=100,
                 messages=[{"role": "user", "content": "hi"}],
@@ -580,8 +578,6 @@ def test_agentic_loop_params_omits_keys_when_dynamic_values_are_none():
                 custom_llm_provider="anthropic",
                 litellm_logging_obj=logging_obj,
             )
-        except (ValueError, TypeError, AttributeError):
-            pass
 
     agentic_loop_params = logging_obj.model_call_details.get("agentic_loop_params")
     assert agentic_loop_params is not None