An agent inside Excel that audits the monthly management accounts workbook, finds formula errors and anomalies, updates assumptions without breaking links and shows every change as a highlighted cell before you accept it
The problem
The monthly management accounts live in a workbook that has grown for five years: one sheet links to another, someone overwrote a formula with a number in March, and the budget versus actual tab quietly stopped matching the P&L. The finance manager finds out when the owner asks why the margin jumped, and spends an evening tracing cells.
How the agent works
Before the management accounts go to the owner, the finance manager opens the workbook with the Claude for Excel add in and asks it to check the model: explain how the P&L, cash and budget versus actual sheets connect, find formula errors and anomalies, and list any assumption that drives the margin. Claude reads the workbook, answers with cell level citations the manager can jump to, and proposes fixes that preserve the structure and formula dependencies. When this month's actuals or an assumption change, the manager asks Claude to update them without breaking the links. Every proposed change shows up as highlighted cells and nothing is saved until the manager accepts, so the human stays the last check. The same conversation can then carry the updated figures into the board deck in PowerPoint or the memo in Word.
Worked example
Anthropic describes Claude for Excel as reading, analysing, modifying and creating workbooks: explaining how a spreadsheet works, modifying it while preserving structure and formula dependencies, debugging and fixing cell formulas, and tracking its changes with cell level citations you can jump to. Its financial services page adds that insurance teams use it to validate formulas and flag anomalies in actuarial workbooks while keeping sign off themselves. The add in is generally available on all paid Claude plans from the Claude for Microsoft 365 listing on AppSource, changes appear as highlighted cells, and nothing is saved until you say so. Citadel, Bain & Company and ServiceNow are quoted as users; no SMB figures are published.
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