Yes, you are right that for a model that wants to use tools, the environment was wrong. I didn't do that on purpose. I was simply interested in seeing what the answer to my question would be. The fact Gemma 4 wanted to use tools was a bit of a surprise to me - the Qwen model also can use tools, but it opted not to.

I think it is interesting to see, that when forced to derive the value on its own, Gemma gets it wrong while Qwen gets it right (although in a very costly way).

I also think that not using tools is better than hallucinating using them.