When using Step by Step run (similar to "Run agents one step at a time" form documentation) in combination with a custom tool "operator_tool", an authorization error is raised:
response = operator_tool("Hi") due to: InterpreterError: Forbidden function evaluation: 'operator_tool' is not among the explicitly allowed tools or defined/imported in the preceding code

Adding it to additional_authorized_imports did not help.
When running using .run() everything works well.