Spreadsheets

Use this skill when the user wants to create or modify workbooks with the artifacts tool.

Tool Contract

• Use the artifacts tool.
• Send raw JavaScript only. Do not send JSON objects, quoted code, or markdown fences.
• This tool runs plain JavaScript in Node, not TypeScript. Do not use type annotations, type, interface, or import type.
• Do not write import { ... } from "@oai/artifact-tool". The package surface is already preloaded.
• Named exports such as Workbook, SpreadsheetFile, and FileBlob are available directly.
• The full module is also available as artifactTool, artifacts, and codexArtifacts.
• Save outputs under a user-visible path such as artifacts/revenue-model.xlsx.

Quick Start

const workbook = Workbook.create();
const sheet = workbook.worksheets.add("Revenue");

sheet.getRange("A1:C1").values = [["Month", "Bookings", "ARR"]];
sheet.getRange("A2:C4").values = [
  ["Jan", 120000, 1440000],
  ["Feb", 135000, 1620000],
  ["Mar", 142000, 1704000],
];

sheet.getRange("E1").values = [["Quarter ARR"]];
sheet.getRange("E2").formulas = [["=SUM(C2:C4)"]];

workbook.recalculate();

const xlsxBlob = await SpreadsheetFile.exportXlsx(workbook);
await xlsxBlob.save("artifacts/revenue-model.xlsx");

Common Patterns

• Create a workbook with Workbook.create().
• Import an existing workbook with await SpreadsheetFile.importXlsx(await FileBlob.load("book.xlsx")).
• Add sheets with workbook.worksheets.add(name).
• Address cells and ranges with A1 notation via sheet.getRange("A1:C10").
• Set range.values and range.formulas, then call workbook.recalculate() before reading computed values.
• For charts, prefer creating the chart first, then populating it directly on the returned object. In practice, the reliable pattern is const chart = sheet.charts.add("line"); chart.setPosition("A10", "H24"); chart.title = "..."; chart.categories = [...]; const series = chart.series.add("Name"); series.values = [...];. Some other chart-construction styles can produce workbook objects that look valid in memory but export to empty or hidden charts in the final .xlsx.
• For worksheet images, prefer sheet.images.add({ blob, contentType, anchor: { from: ..., to: ... } }). The blob payload shape is the reliable path.
• Export an .xlsx with await SpreadsheetFile.exportXlsx(workbook).

Workflow

• Model the workbook structure first: sheets, headers, and key formulas.
• Use formulas instead of copying computed values when the sheet should remain editable.
• Recalculate before exporting or reading formula results.
• If the workbook includes charts or images, verify layout after export, not just in memory. A sheet-level render pass such as await workbook.render({ sheet: index, format: "png" }) is a good QA step before handoff.
• Check where drawings land on the actual sheet. Merged cells and very tall autofit rows can push visible content far below the fold, so QA should confirm not only that a chart exists, but that it appears in an obvious on-sheet location.
• When editing an existing workbook, load it first and preserve unaffected sheets.

Reference Map

• references/workbook.md for workbook lifecycle and worksheet basics.
• references/ranges.md for A1 addressing, values, formulas, and formatting.