# 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.

- Skill: `aibot88/xlsx-author` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add aibot88/xlsx-author`
- Raw SKILL.md: https://api.skillmd.com/api/skills/aibot88/xlsx-author/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: aibot88 (https://skillmd.com/u/aibot88)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/aibot88/xlsx-author

---


# 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`:

```python
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.