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xlsx

Write a real Excel workbook (.xlsx) from JSON or CSV — several sheets, styled header, numbers, formulas, a SUM total row — or read an existing .xlsx back to…

Skill by metadist

IndexedApache-2.0★ 34
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Install

Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/metadist-xlsx

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

Write a real Excel workbook (.xlsx) from JSON or CSV — several sheets, styled header, numbers, formulas, a SUM total row — or read an existing .xlsx back to JSON/CSV. Standard library only, no Excel needed.

Use cases: spreadsheets, writing

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Permissions

What this skill can do and what it asks for, from its SKILL.md and code. Checked Oct 26, 2026.

Tools
No tools found
Secrets
None asked for
Install scripts
None found
Runs as
Python package

Network hosts it talks to 2

  • codeload.github.com · found in install command
  • schemas.openxmlformats.org · found in code

Files it touches

  • ~/.claude/skills/xlsx

What's inside

Skill name
xlsx
Description
Write a real Excel workbook (.xlsx) from JSON or CSV — several sheets, styled header, numbers, formulas, a SUM total row — or read an existing .xlsx back to JSON/CSV. Standard library only, no Excel needed.
License
Apache-2.0
Instructions
54 lines in SKILL.md · view on GitHub

Before installing

  • Ships executable scripts

Agent Skills spec issues

  • compatibility: must be text of at most 500 characters

Files (2)

  • SKILL.md
  • run.py

SKILL.md (first lines)

# xlsx

Create a `.xlsx` that opens in Excel, LibreOffice Calc and Google Sheets, or
read one so its numbers can be analysed, merged or re-shaped. No extra
packages: the script builds the OOXML package itself.

## When to use

- The user wants a spreadsheet: a summary table, merged data from several
  workbooks, a list with totals.
- The user has `.xlsx` files in an allowed folder and wants to combine or
  analyse them — **read** each one first, then **write** the result.

## How to run

Read (JSON contains every sheet; CSV takes the first sheet):

```
python3 <skill_dir>/run.py read <input.xlsx> <output.json>
```

Write: first save the spec with `write_file` into the out-box, then

```
python3 <skill_dir>/run.py write <spec.json> <output.xlsx>
python3 <skill_dir>/run.py write <input.csv> <output.xlsx>
```

- `<output.xlsx>` / `<output.json>` — paths **inside the out-box**.
- `<input.xlsx>` — a workbook in an allowed folder or in the out-box.

## Spec for write

```json
{
  "sheets": [
    {
      "name": "Summary",
      "columns": ["Region", "Units", "Revenue"],
      "rows": [["North", 120, 15400.5], ["South", 90, 10200]],
      "totals": true
    }
  ]
}
```

- Numbers stay numbers; a string starting with `=` is written as a formula
  (`"=C2*1.19"`). `"totals": true` adds a `SUM` row under numeric columns.
- The header row is bold and frozen, with a filter. Sheet names are trimmed
  to Excel's 31 characters.

Standard library only. After the script exits 0, tell the user the full path.

From metadist/synaplan-desktop, Apache-2.0.

More from metadist/synaplan-desktop

Signals

Stars
34
Forks
1
Open issues
2
Last commit (this folder)
Sep 16, 2026 (1 month ago)

From GitHub (fetched Oct 24, 2026).

Details

License
Apache-2.0
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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Cite this page

xlsx skill. Agent Mart. https://agentmart.dev/skills/metadist-xlsx (last updated 2026-10-24)