Marker parameter for objects that tools can return directly.
If a custom BaseTool is invoked with a ToolCall and the output of custom code is
not an instance of DirectToolOutput, the output will automatically be coerced to
a string and wrapped in a ToolMessage.
Marker parameter for objects that tools can return directly.
If a custom BaseTool is invoked with a ToolCall and the output of custom code is not an instance of DirectToolOutput, the output will automatically be coerced to a string and wrapped in a ToolMessage.