Use this skill when running headless (managed-agent / CMA mode) and you need to deliver an Excel workbook as a file artifact rather than editing a live workbook via 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
Write a short Python script and run it with Bash. Use 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
If `mcp__office__excel_*` tools are available (Cowork plugin mode), use those instead — they drive the user's live workbook with review checkpoints. This skill is the file-producing fallback for headless runs.