diff --git a/litellm/llms/anthropic/chat/transformation.py b/litellm/llms/anthropic/chat/transformation.py
index 18c53b696..47264b8f0 100644
--- a/litellm/llms/anthropic/chat/transformation.py
+++ b/litellm/llms/anthropic/chat/transformation.py
@@ -7,6 +7,7 @@ from litellm.types.llms.anthropic import (
     AllAnthropicToolsValues,
     AnthropicComputerTool,
     AnthropicHostedTools,
+    AnthropicInputSchema,
     AnthropicMessageRequestBase,
     AnthropicMessagesRequest,
     AnthropicMessagesTool,
@@ -159,15 +160,19 @@ class AnthropicConfig:
         returned_tool: Optional[AllAnthropicToolsValues] = None
 
         if tool["type"] == "function" or tool["type"] == "custom":
+            _input_function_parameters: dict = (
+                tool["function"].get("parameters", None) or {}
+            )
+            _tool_input_schema: AnthropicInputSchema = AnthropicInputSchema(
+                type=_input_function_parameters.get("type", "object"),
+                properties=_input_function_parameters.get("properties", {}),
+                additionalProperties=_input_function_parameters.get(
+                    "additionalProperties", True
+                ),
+            )
             _tool = AnthropicMessagesTool(
                 name=tool["function"]["name"],
-                input_schema=tool["function"].get(
-                    "parameters",
-                    {
-                        "type": "object",
-                        "properties": {},
-                    },
-                ),
+                input_schema=_tool_input_schema,
             )
 
             _description = tool["function"].get("description")
@@ -304,17 +309,10 @@ class AnthropicConfig:
                 - You should set tool_choice (see Forcing tool use) to instruct the model to explicitly use that tool
                 - Remember that the model will pass the input to the tool, so the name of the tool and description should be from the model’s perspective.
                 """
-                _tool_choice = None
                 _tool_choice = {"name": "json_tool_call", "type": "tool"}
-
-                _tool = AnthropicMessagesTool(
-                    name="json_tool_call",
-                    input_schema={
-                        "type": "object",
-                        "properties": {"values": json_schema},  # type: ignore
-                    },
+                _tool = self._create_json_tool_call_for_response_format(
+                    json_schema=json_schema,
                 )
-
                 optional_params["tools"] = [_tool]
                 optional_params["tool_choice"] = _tool_choice
                 optional_params["json_mode"] = True
@@ -341,6 +339,34 @@ class AnthropicConfig:
 
         return optional_params
 
+    def _create_json_tool_call_for_response_format(
+        self,
+        json_schema: Optional[dict] = None,
+    ) -> AnthropicMessagesTool:
+        """
+        Handles creating a tool call for getting responses in JSON format.
+
+        Args:
+            json_schema (Optional[dict]): The JSON schema the response should be in
+
+        Returns:
+            AnthropicMessagesTool: The tool call to send to Anthropic API to get responses in JSON format
+        """
+        _input_schema: AnthropicInputSchema = AnthropicInputSchema(
+            type="object",
+        )
+
+        if json_schema is None:
+            # Anthropic raises a 400 BadRequest error if properties is passed as None
+            # see usage with additionalProperties (Example 5) https://github.com/anthropics/anthropic-cookbook/blob/main/tool_use/extracting_structured_json.ipynb
+            _input_schema["additionalProperties"] = True
+            _input_schema["properties"] = {}
+        else:
+            _input_schema["properties"] = json_schema
+
+        _tool = AnthropicMessagesTool(name="json_tool_call", input_schema=_input_schema)
+        return _tool
+
     def is_cache_control_set(self, messages: List[AllMessageValues]) -> bool:
         """
         Return if {"cache_control": ..} in message content block
diff --git a/litellm/types/llms/anthropic.py b/litellm/types/llms/anthropic.py
index b0a3780b8..55e37ad97 100644
--- a/litellm/types/llms/anthropic.py
+++ b/litellm/types/llms/anthropic.py
@@ -12,10 +12,16 @@ class AnthropicMessagesToolChoice(TypedDict, total=False):
     disable_parallel_tool_use: bool  # default is false
 
 
+class AnthropicInputSchema(TypedDict, total=False):
+    type: Optional[str]
+    properties: Optional[dict]
+    additionalProperties: Optional[bool]
+
+
 class AnthropicMessagesTool(TypedDict, total=False):
     name: Required[str]
     description: str
-    input_schema: Required[dict]
+    input_schema: Optional[AnthropicInputSchema]
     type: Literal["custom"]
     cache_control: Optional[Union[dict, ChatCompletionCachedContent]]