diff --git a/litellm/llms/anthropic/chat/transformation.py b/litellm/llms/anthropic/chat/transformation.py
index 44ca229be77..144cccfa4d0 100644
--- a/litellm/llms/anthropic/chat/transformation.py
+++ b/litellm/llms/anthropic/chat/transformation.py
@@ -479,7 +479,12 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                 optional_params = self._add_tools_to_optional_params(
                     optional_params=optional_params, tools=[_tool]
                 )
-            if param == "user":
+            if (
+                param == "user"
+                and value is not None
+                and isinstance(value, str)
+                and _valid_user_id(value)  # anthropic fails on emails
+            ):
                 optional_params["metadata"] = {"user_id": value}
             if param == "thinking":
                 optional_params["thinking"] = value
diff --git a/litellm/proxy/_new_secret_config.yaml b/litellm/proxy/_new_secret_config.yaml
index d339856116d..7ea414d262d 100644
--- a/litellm/proxy/_new_secret_config.yaml
+++ b/litellm/proxy/_new_secret_config.yaml
@@ -82,6 +82,10 @@ model_list:
     litellm_params:
       model: "openai/*"
       api_key: os.environ/OPENAI_API_KEY_TEST
+  - model_name: "anthropic-claude"
+    litellm_params:
+      model: "anthropic/claude-3-5-sonnet-latest"
+      api_key: os.environ/ANTHROPIC_API_KEY
 
 general_settings:
   store_model_in_db: true