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Xlsx Author

Produce a .xlsx file on disk (headless) instead of driving a live Excel workbook — for managed-agent sessions with no open Office app.

Used by (9)

Manifest

{
  "name": "xlsx-author",
  "category": "investment-framework",
  "description": "Produce a .xlsx file on disk (headless) instead of driving a live Excel workbook — for managed-agent sessions with no open Office app."
}

Entry Markdown

xlsx-author

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.

Files (1)

tree_hash: b3022006c2b6ff0c60d3e4e6188226b9889a2799d0b821f579a869ecac135d10
created_at: 2026-05-11T20:47:25.091488+00:00
file_count: 1
size_bytes: 1,807