Agent skill

Sandbox Zip

Read and write zip archives in a Code node or CodeAct action, with fflate running on the host under a 50 MB inflation cap

AGPL-3.0Auto-check passedDocuments & Office

Install Sandbox Zip

skills CLI

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

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

GitHub CLI

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

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-zip -a codex

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

GitHub CLI

$ gh skill install nodetool-ai/nodetool sandbox-zip --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-zip .agents/skills/sandbox-zip && 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-zip" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-zip into .agents/skills/sandbox-zip/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-zip", 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-zip -a cursor

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

GitHub CLI

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

--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-zip -a gemini-cli

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

GitHub CLI

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

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-zip -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-zip .github/skills/sandbox-zip && 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-zip" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-zip into .github/skills/sandbox-zip/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-zip", 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-zip -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-zip --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-zip .opencode/skills/sandbox-zip && 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-zip" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-zip into .opencode/skills/sandbox-zip/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-zip", 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-zip
GitHub stars: 560
Token cost: ~492 tokens
SKILL.md length: 215 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 zip archives in a Code node or CodeAct action, with fflate running on the host under a 50 MB inflation cap

Documents & Office work in your project
SKILL.md covers Why this one runs on the host, unzip — extract an archive, zip — build one and Gotchas
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Sandbox Zip is an agent skill from nodetool-ai/nodetool. Read and write zip archives in a Code node or CodeAct action, with fflate running on the host under a 50 MB inflation cap

Its SKILL.md is about 490 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. The repository describes itself as: Agent-first Creative Workspace. The licence is AGPL-3.0.

When your agent uses it

Documents & Office work in your project

Example prompts

“/sandbox-zip”

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 Zip loads about 492 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 215 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~33
When it runs · the whole SKILL.md, loaded when a task matches: ~492

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). 215 words, ~492 tokens.

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

name: sandbox-zip
description: Read and write zip archives in a Code node or CodeAct action, with fflate running on the host under a 50 MB inflation cap

Zip archives in the sandbox

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

Why this one runs on the host

fflate is pure JavaScript and the sandbox compiler admits it, so this pack could have shipped as a guest module — and an earlier version did. It does not, because of the cap: a zip bomb is a policy question, and a policy enforced inside the guest is enforced by code the guest can simply not call. The guest's 64 MB heap does not replicate it either — fflate inflates into host memory first. So the library stays on the host, with unzip refusing anything that inflates past 50 MB, and there is no second route around that number.

unzip — extract an archive

import { unzip } from "@nodetool-ai/sandbox-zip";

const files = await unzip(inputs.archive);          // { "a/b.txt": Uint8Array }
const readme = new TextDecoder().decode(files["README.md"]);
return { names: Object.keys(files), readme };

Entry values arrive as real Uint8Arrays. Decode text with TextDecoder.

zip — build one

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

const archive = await zip({
  "report.md": inputs.markdown,                     // strings are UTF-8 encoded
  "data.json": JSON.stringify(inputs.rows)
});
await workspace.writeBytes("out.zip", archive);
return { bytes: archive.length };

Entry values are Uint8Array or string.

Gotchas

Both exports are async.
10 MB in, 50 MB out. The archive itself is capped at 10 MB; the sum of the entries unzip produces — and the sum of what zip is handed — is capped at 50 MB, checked as the entries are walked so a bomb stops part way.
No streaming. The whole archive is materialized. For a payload near the cap, write entries to the workspace as you go instead.

Files

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

SKILL.md
package.json

Open the folder on GitHubat commit 339f069

Compare with similar skills

Sandbox Zip 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 Zip compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Sandbox Zip this skillnodetool-ai/nodetool	560	—	~492	Automated safety check: Pass	AGPL-3.0	today
Markdown Article FormatterJimLiu/baoyu-skills	27k	6 repos	~3.5k	Automated safety check: Pass	MIT	29 days ago
MarkitdownImCa0/just-laws	781	14 repos	~3.2k	Automated safety check: Notes	MIT	2 days ago
Obsidian MarkdownAtmosphere/atmosphere	3.8k	20 repos	~1.3k	Automated safety check: Pass	Apache-2.0	yesterday
DOCXrvdbreemen/OTGW-firmware	207	33 repos	~4.3k	Automated safety check: Pass	Proprietary	3 days ago
Word Document Reader and WriterHKUDS/DeepTutor	41k	—	~2.5k	Automated safety check: Pass	Apache-2.0	2 days ago

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Questions about Sandbox Zip

What does Sandbox Zip do?

Read and write zip archives in a Code node or CodeAct action, with fflate running on the host under a 50 MB inflation cap. Sandbox Zip is an agent skill from nodetool-ai/nodetool.

When should I use Sandbox Zip?

Sandbox Zip fits situations like: documents & Office work in your project.

How do I install Sandbox Zip in Claude Code?

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

How do I install Sandbox Zip in Codex?

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

Can I use Sandbox Zip 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-zip -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-zip, .gemini/skills/sandbox-zip, .github/skills/sandbox-zip and .opencode/skills/sandbox-zip in your project.

What does Sandbox Zip need to run?

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

Does Sandbox Zip 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 Zip 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 Zip use?

Sandbox Zip 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 Zip use?

About 492 tokens (SKILL.md is roughly 2k 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 Zip?

Skills that share tags, products or a category with Sandbox Zip: Markdown Article Formatter (JimLiu/baoyu-skills, 27k stars), Markitdown (ImCa0/just-laws, 781 stars), Obsidian Markdown (Atmosphere/atmosphere, 3.8k stars) and DOCX (rvdbreemen/OTGW-firmware, 207 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sandbox Zip?

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 Zip

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

Zip archives in the sandbox

Why this one runs on the host

unzip — extract an archive

zip — build one

Gotchas

Files

Compare with similar skills

Similar skills

More from nodetool-ai/nodetool

Related

Questions about Sandbox Zip