# XLSX Author

> Produce a .xlsx workbook file on disk for headless sessions or artifact-based workflows instead of driving a live Excel workbook. Use when the user needs a workbook artifact created or updated from data and instructions.

- Skill: `openinterpreter/xlsx-author` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add openinterpreter/xlsx-author`
- Raw SKILL.md: https://api.skillmd.com/api/skills/openinterpreter/xlsx-author/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: openinterpreter (https://skillmd.com/u/openinterpreter)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/openinterpreter/xlsx-author

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# XLSX Author

Use this skill when running headless or when the user needs an Excel workbook delivered as a file artifact rather than editing a live workbook.

Use this skill for file-producing workflows. A configured document engine may
provide a live embedded editor or visual export, but workbook authoring remains
code-driven and works without that optional integration.

## Output Contract

- Write to `./out/<name>.xlsx` unless the user provides a different path.
- Create `./out/` if it does not exist.
- Return the relative path in the final message.

## How To Build The Workbook

Write a short script and run it. Prefer `openpyxl` for Python-based workbook authoring.

```python
from openpyxl import Workbook
from openpyxl.styles import Font

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)"  # formula cell

wb.save("./out/model.xlsx")
```

## Conventions

- Blue cells are hardcoded inputs.
- Black cells are formulas.
- Green cells are links to another sheet or file.
- Do not hardcode values in calculation cells.
- Put assumptions on an Inputs tab.
- Use named ranges for values referenced from a deck or memo.
- Include a Checks tab for balance checks, cash tie-outs, and other TRUE/FALSE controls.
- Keep one model per file unless the user explicitly asks to append to an existing workbook.