Agent skill

Sandbox XLSX

Read and write Excel workbooks in a Code node or CodeAct action, with exceljs running on the host

AGPL-3.0Auto-check passedDocuments & Office

Install Sandbox XLSX

skills CLI

$ npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-xlsx --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/sandbox-packs/sandbox-xlsx .claude/skills/sandbox-xlsx && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "sandbox-xlsx" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx into .claude/skills/sandbox-xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-xlsx", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-xlsx --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/sandbox-packs/sandbox-xlsx .agents/skills/sandbox-xlsx && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "sandbox-xlsx" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx into .agents/skills/sandbox-xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-xlsx", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-xlsx --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/sandbox-packs/sandbox-xlsx .cursor/skills/sandbox-xlsx && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "sandbox-xlsx" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx into .cursor/skills/sandbox-xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-xlsx", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nodetool-ai/nodetool.git --path packages/sandbox-packs/sandbox-xlsx

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-xlsx --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/sandbox-packs/sandbox-xlsx .gemini/skills/sandbox-xlsx && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "sandbox-xlsx" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx into .gemini/skills/sandbox-xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-xlsx", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-xlsx

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/sandbox-packs/sandbox-xlsx .github/skills/sandbox-xlsx && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "sandbox-xlsx" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx into .github/skills/sandbox-xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-xlsx", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-xlsx --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/sandbox-packs/sandbox-xlsx .opencode/skills/sandbox-xlsx && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "sandbox-xlsx" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-xlsx into .opencode/skills/sandbox-xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-xlsx", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: sandbox-xlsx
GitHub stars: 560
Token cost: ~681 tokens
SKILL.md length: 274 words
Files: 2
Skills in repo: 127
Repo updated: Oct 10, 2026
First seen: Oct 7, 2026
Licence: AGPL-3.0

At a glance

Read and write Excel workbooks in a Code node or CodeAct action, with exceljs running on the host

Tasks that involve Excel spreadsheets
SKILL.md covers parse — workbook bytes to…, write — records to workbook… and Gotchas
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Sandbox XLSX is an agent skill from nodetool-ai/nodetool. Read and write Excel workbooks in a Code node or CodeAct action, with exceljs running on the host

Its SKILL.md is about 680 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `package.json`).

It sits in Documents & Office, covering Excel spreadsheets. It works with Microsoft Excel. The repository describes itself as: Agent-first Creative Workspace. The licence is AGPL-3.0.

When your agent uses it

Tasks that involve Excel spreadsheets

Example prompts

“/sandbox-xlsx”

What it can do on your machine

Read from SKILL.md and the folder at commit 339f069. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Sandbox XLSX loads about 681 tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 274 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~28
When it runs · the whole SKILL.md, loaded when a task matches: ~681

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from nodetool-ai/nodetool at commit 339f069, republished under its AGPL-3.0 licence (© nodetool-ai). 274 words, ~681 tokens.

Download SKILL.mdSave it as .claude/skills/sandbox-xlsx/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: sandbox-xlsx
description: Read and write Excel workbooks in a Code node or CodeAct action, with exceljs running on the host

Excel workbooks in the sandbox

Specifier: @nodetool-ai/sandbox-xlsx. Import it at the top of the body.

exceljs is built on Node streams and ships its own zip layer; it will never be a guest module. This pack is a host module: the import resolves to a generated facade over NodeTool's own implementation.

parse — workbook bytes to records

import { parse } from "@nodetool-ai/sandbox-xlsx";

const bytes = await workspace.readBytes("report.xlsx");
const sheets = await parse(bytes);            // { "Sheet1": [...], "Costs": [...] }
const rows = await parse(bytes, { sheet: "Costs" });   // one sheet's rows
return { sheetNames: Object.keys(sheets), rows };

Options: sheet (name — returns that sheet's rows directly) and header (default true; false gives raw cell arrays). Formula cells yield their computed result, dates come back as ISO strings, and rich text is flattened.

Get the bytes from workspace.readBytes, or from a fetched body with await response.bytes().

write — records to workbook bytes

import { write } from "@nodetool-ai/sandbox-xlsx";

const bytes = await write({ Costs: inputs.rows, Notes: [{ note: "draft" }] });
await workspace.writeBytes("report.xlsx", bytes);

{sheetName: rows} is the short form. The long form is an array, one entry per sheet, which is where per-sheet options live:

const bytes = await write([
  {
    name: "Costs",
    rows: inputs.rows,
    columns: ["item", "usd"],                 // pin the column order
    styles: [
      { range: "A1:B1", bold: true, background: "FFE9A8" },
      { range: "B2:B999", numberFormat: "$#,##0.00" }
    ]
  }
]);

Rows are records by default, and the header is the union of their keys in first-seen order unless columns pins it. header: false takes arrays of cells instead and writes no header row. Column widths are fitted to the content; pass { autoFitColumns: false } to leave them alone. A style's range is A1 or A1:C20, and it takes bold, italic, size, color, background (hex, with or without #) and numberFormat.

Gotchas

Both exports are async.
10 MB per workbook read. Larger input is refused by name.
A missing sheet name throws, and the error lists the sheets that exist.
write caps a workbook at 64 sheets and 250 000 cells.
Values that are not a number, string, boolean or date are stored as JSON text. A cell cannot hold bytes.
Nothing is saved for you. write returns bytes; workspace.writeBytes (or sandboxToAsset) is what puts them somewhere.

Files

SKILL.md and 1 other file in packages/sandbox-packs/sandbox-xlsx of nodetool-ai/nodetool.

SKILL.md
package.json

Open the folder on GitHubat commit 339f069

Compare with similar skills

Sandbox XLSX next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Sandbox XLSX compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Sandbox XLSX this skillnodetool-ai/nodetool	560	—	~681	Automated safety check: Pass	AGPL-3.0	yesterday
MarkitdownImCa0/just-laws	781	14 repos	~3.2k	Automated safety check: Notes	MIT	3 days ago
Data Table Managern8n-io/n8n	207k	—	~2.3k	Automated safety check: Pass	Custom licence	today
Docx4jplutext/docx4j	2.4k	—	~2.5k	Automated safety check: Pass	None	today
Instrument Data To Allotropeaws-samples/amazon-bedrock-agents-healthcare-lifesciences	274	2 repos	~2.7k	Automated safety check: Pass	Apache-2.0	9 days ago
Cyber Pptcrazyykhllc-bit/CyberPPT	1.8k	—	~10k	Automated safety check: Pass	MIT	2 mo ago

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Works with

Microsoft Excel

Questions about Sandbox XLSX

What does Sandbox XLSX do?

Read and write Excel workbooks in a Code node or CodeAct action, with exceljs running on the host. Sandbox XLSX is an agent skill from nodetool-ai/nodetool.

When should I use Sandbox XLSX?

Sandbox XLSX fits situations like: tasks that involve Excel spreadsheets.

How do I install Sandbox XLSX in Claude Code?

Run `npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a claude-code`. Or copy the skill folder (packages/sandbox-packs/sandbox-xlsx in nodetool-ai/nodetool) into .claude/skills/sandbox-xlsx in your project. Claude Code loads it when a task matches its description.

How do I install Sandbox XLSX in Codex?

Run `npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a codex`. Or copy the skill folder (packages/sandbox-packs/sandbox-xlsx in nodetool-ai/nodetool) into .agents/skills/sandbox-xlsx in your project. Codex loads it when a task matches its description.

Can I use Sandbox XLSX in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nodetool-ai/nodetool --skill sandbox-xlsx -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sandbox-xlsx, .gemini/skills/sandbox-xlsx, .github/skills/sandbox-xlsx and .opencode/skills/sandbox-xlsx in your project.

What does Sandbox XLSX need to run?

SKILL.md names no scripts, command-line tools or credentials: Sandbox XLSX is instructions for the agent only.

Does Sandbox XLSX access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Sandbox XLSX safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Sandbox XLSX use?

Sandbox XLSX is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Sandbox XLSX use?

About 681 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Sandbox XLSX?

Skills that share tags, products or a category with Sandbox XLSX: Markitdown (ImCa0/just-laws, 781 stars), Data Table Manager (n8n-io/n8n, 207k stars), Docx4j (plutext/docx4j, 2.4k stars) and Instrument Data To Allotrope (aws-samples/amazon-bedrock-agents-healthcare-lifesciences, 274 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sandbox XLSX?

nodetool-ai (a GitHub organization) maintains it in nodetool-ai/nodetool, which has 560 GitHub stars. The repository holds 127 skills in this directory. The repository was last updated on October 10, 2026.

Source: nodetool-ai/nodetool on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Sandbox XLSX

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Excel workbooks in the sandbox

parse — workbook bytes to records

write — records to workbook bytes

Gotchas

Files

Compare with similar skills

Similar skills

More from nodetool-ai/nodetool

Related

Questions about Sandbox XLSX