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The account and the two periods select which invoices are compared. The question
text shapes the wording of the explanation, not the arithmetic — the comparison is
computed by billing_compare_invoices, never by the model. Every figure is
validated against the evidence before it is shown; if validation fails the narration is
withheld and the computed ranking is shown instead.
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Switch role and ask the same question. The manifest changes, the answer changes, and a request for an account outside scope is denied and written to the audit log.