xlsx-author

mcp__office__excel_*

Output contract

• Write to

  ./out/<name>.xlsx

  . Create

  ./out/

  if it does not exist.
• Return the relative path in your final message so the orchestration layer can collect it.

How to build the workbook

openpyxl

from openpyxl import Workbook
from openpyxl.styles import Font, PatternFill

wb = Workbook()
ws = wb.active; ws.title = "Inputs"
ws["B2"] = "Revenue"; ws["C2"] = 1_250_000_000
ws["C2"].font = Font(color="0000FF")           # blue = hardcoded input
calc = wb.create_sheet("DCF")
calc["C5"] = "=Inputs!C2*(1+Inputs!C3)"        # black = formula
wb.save("./out/model.xlsx")

Conventions (mirror

audit-xls

)

• Blue / black / green. Blue = hardcoded input, black = formula, green = link to another sheet/file.
• No hardcodes in calc cells. Every calculation cell is a formula; every input lives on an Inputs tab.
• Named ranges for any value referenced from a deck or memo.
• Balance checks. Include a Checks tab that ties (BS balances, CF ties to cash, etc.) and surfaces TRUE/FALSE.
• One model per file. Do not append to an existing workbook unless explicitly asked.

When NOT to use

mcp__office__excel_*