fix(types): correct type for InputSchema (#498)

src/anthropic/types/beta/tools/tool_param.py

@@ -2,18 +2,21 @@
 
 from __future__ import annotations
 
-from typing import Optional
+from typing import Dict, Union, Optional
 from typing_extensions import Literal, Required, TypedDict
 
 __all__ = ["ToolParam", "InputSchema"]
 
 
-class InputSchema(TypedDict, total=False):
+class InputSchemaTyped(TypedDict, total=False):
     type: Required[Literal["object"]]
 
     properties: Optional[object]
 
 
+InputSchema = Union[InputSchemaTyped, Dict[str, object]]
+
+
 class ToolParam(TypedDict, total=False):
     input_schema: Required[InputSchema]
     """[JSON schema](https://json-schema.org/) for this tool's input.