TehRiehlDeal
4939122cf2
The model was producing lines like "you've saved $755.21 ($18,952.39 - $83,276.19)" — pulling net worth and total debt from the snapshot and subtracting them as if that yielded monthly savings. The figures had no relationship to each other, and the parenthetical math didn't even equate to the dollar number it cited. Two fixes in the system prompt: - Pre-compute "Saved this month" = income - expense (and the same for last month) so the model never has to derive it. - Section the numbers into "Standing balance (point-in-time)" and "This month (flow)" with an explicit rule that standing-balance figures are not flow and must not be subtracted from each other. - Add a guardrail forbidding invented equations and parenthetical arithmetic in the narrative. Also formats every dollar figure with thousands separators so the model sees and echoes "$15,000.00" instead of "$15000". Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>