See the link in my post. It asks you to run the tool. You run the tool and tell it the result... And then it uses the result of the tool to decide to reply to the user.
The link talks about tools that 'lie' - ie. a calculator which deliberately tries to trick GPT-4 into giving the wrong answer. It turns out that GPT-4 only trusts the tools to a certain extent - if the answer the tool gives is too unbelievable, then GPT-4 will either re-run the tool or give a hallucinated answer instead.
It's always giving a hallucinated answer. GPT doesn't 'run' anything. It sees an input string of text asking for the result of fibonacci(100) and finds from its immense training set a response that's closely related to training data that had the result of fibonacci(100) (an extremely common programming exercise with results all over the internet and presumably its training data).
Again, GPT is not running a tool or arbitrary python code. It's not applying trust to a tool response. It has no reasoning or even a concept of what a tool is--you're projecting that on it. It is only generating text from an input stream of text.
The link talks about tools that 'lie' - ie. a calculator which deliberately tries to trick GPT-4 into giving the wrong answer. It turns out that GPT-4 only trusts the tools to a certain extent - if the answer the tool gives is too unbelievable, then GPT-4 will either re-run the tool or give a hallucinated answer instead.