What problem does it solve? Spreadsheets silently drift from the systems they mirror — a hand-edited row, a stale export, a rollup formula pointing at an old range — and a vague "all match" claim hides the damage. This Skill performs a rigorous, read-only reconciliation that names both sides, cites every disagreement to its exact cell and source line, and never writes a fix without the owner's explicit approval. ## Core Features & Use Cases - Cited row-by-row comparison: Walks every join key on both sides and reports each mismatch with the side-A cell reference (Tab!A4:D4) and the side-B record (line number or record id). - Rollup verification: Recomputes summary cells from the detail ranges they claim to cover and flags stale or incorrect totals. - Read-only safety boundary: Proposes fixes as drafts only — it never writes, overwrites, appends, or deletes a cell, and quarantines unreadable values instead of forcing a verdict. - Use Case: Verify that a CRM export still matches the tracking sheet your team maintains, producing a mismatch table with verdicts (missing-A, missing-B, value-drift, stale-read, unreadable) and draft fixes for the owner to confirm cell by cell. ## Quick Start Ask the AI to reconcile the range Sheet1!A2:D200 in your workbook against the attached CRM export CSV and report every mismatch with cell citations.
