2026-11-02
Will the AI invent a quote? The guardrails we actually ship
Asked for a year-one total, models love to multiply by twelve. One wrong product becomes a promise. So we do not let it multiply.
Copy, do not calculate
Each plan lists prices excl. and incl. VAT. Adding lines or annualising is forbidden. Combined totals go through the cart; checkout recomputes tax with the same function and ignores amounts sent from the browser.
Tests catch regressions
A test fails the build if the agent starts inventing totals. That is more reliable than asking the model to be careful.