Forbidden function evaluation: 'print' is not among the explicitly allowed tools

[Artem535]

Hi!
I'm currently working on creating an MCP server to execute Python code, primarily focusing on running code that uses pandas. However, I’m encountering errors like:

Code execution failed at line 'print(header_preview.to_string())' due to: InterpreterError: Forbidden function evaluation: 'print' is not among the explicitly allowed tools or defined/imported in the preceding code

This seems strange, since print is included in BASE_PYTHON_TOOLS. I've also faced similar issues with functions like int() and range, which are also listed in BASE_PYTHON_TOOLS.

Could you help me troubleshoot this? Please let me know if you need any additional information.
Thank you!

[Artem535]

Solved this by using: executor.send_tools({})

[albertvillanova]

Thanks for sharing the solution!

I agree that having to explicitly call executor.send_tools({}) isn't very intuitive. It might be worth considering a change in behavior here.