What problem does it solve? When an agent extracts or calculates numbers from documents (invoice totals, sums, counts, derived dates), it can silently trust a wrong declared value or quietly overwrite it with its own calculation. This Skill enforces a numeric cross-check between the stated value and the deterministically recomputed value, emitting a typed mismatch flag with both values and the delta instead of silently correcting, so billing, accounting, and tax pipelines never approve a plausible hallucination. ## Core Features & Use Cases - Stated vs computed cross-check: Extracts the declared value and recalculates the value in code, comparing them with abs(stated - computed) > epsilon. - Typed mismatch output: Returns stated_total, computed_total, delta, mismatch, and needs_human_review, preserving both values and never choosing one unilaterally. - Domain-aware epsilon: Zero tolerance for integer counts, a justified cent-rounding epsilon for currency amounts. - Use Case: An invoice declares a total of 1,900.00 USD but its line items sum to 1,800.00 USD; the Skill emits mismatch=true with the 100.00 delta and routes the case to human review instead of approving payment. ## Quick Start Ask the agent to extract the total from the attached invoice and verify that the declared total matches the sum of its line items, flagging any mismatch for human review.
