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04 / Assistant
The model asks, the code calculates
The assistant reads the question and fills in the fields. The number comes from tested code, never from the model.
Language models are good at understanding a sentence like "I cancelled my gym membership after two months" and bad at the arithmetic that follows. A confident wrong refund is worse than no answer.
So the assistant only decides which calculator you mean and extracts the amounts and dates. Anything it cannot find in your own words is dropped, and the calculation runs in the same tested code the calculator page uses, with a link back to that page so you can check the inputs.