Agent skill

Use Fsutil

by marin-community in marin-community/marin

Use Marin's fsutil CLI for local object-storage operations across GCS, CoreWeave S3, R2, and local paths.

Apache-2.0Auto-check passedBackend & APIs

Install Use Fsutil

skills CLI
$ npx skills add marin-community/marin --skill use-fsutil -a claude-code

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

GitHub CLI
$ gh skill install marin-community/marin use-fsutil --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/marin-community/marin.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/use-fsutil .claude/skills/use-fsutil && 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/

Facts

Skill name
use-fsutil
GitHub stars
3.9k
Token cost
~242 tokens
SKILL.md length
82 words
Files
2
Skills in repo
41
Repo updated
First seen
Licence
Apache-2.0

At a glance

Use Marin's fsutil CLI for local object-storage operations across GCS, CoreWeave S3, R2, and local paths.

  • A task needs to list
  • Calls uv
  • Remove data at gs://
  • S3:// URLs from a checkout

What it does

Use Fsutil is an agent skill from marin-community/marin. Use Marin's fsutil CLI for local object-storage operations across GCS, CoreWeave S3, R2, and local paths. Use whenever a task needs to list, inspect, read, size, find, copy, move, synchronize, hash, browse, or remove data at gs:// or s3:// URLs from a checkout. Do not launch an Iris job solely to access object storage.

Its SKILL.md is about 240 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Backend & APIs, covering File uploads and storage. The repository describes itself as: Open-source framework for the research and development of foundation models. The licence is Apache-2.0.

When your agent uses it

  • A task needs to list
  • Remove data at gs://
  • S3:// URLs from a checkout

Example prompts

  • “/use-fsutil”

Requirements

  • Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit c468793. 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

    Shell commands in SKILL.md call:

    • uv

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.

    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

Use Fsutil loads about 242 tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 82 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~83
When it runs · the whole SKILL.md, loaded when a task matches
~242

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 marin-community/marin at commit c468793, republished under its Apache-2.0 licence (© marin-community). 82 words, ~242 tokens.

Download SKILL.mdSave it as .claude/skills/use-fsutil/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
use-fsutil
description
Use Marin's fsutil CLI for local object-storage operations across GCS, CoreWeave S3, R2, and local paths. Use whenever a task needs to list, inspect, read, size, find, copy, move, synchronize, hash, browse, or remove data at gs:// or s3:// URLs from a checkout. Do not launch an Iris job solely to access object storage.

Use fsutil

Use uv run fsutil from the Marin checkout for operations on gs:// and s3:// paths. It routes each declared bucket to the backend and endpoint in config/*.yaml.

Read docs/references/fsutil.md for commands, behavior, and safety constraints. Let the task determine which command and verification are appropriate.

Use this interface before provider-specific CLIs, hand-built S3 endpoints, custom transfer scripts, or Iris jobs. Do not launch Iris solely to access object storage. For Python code that needs the same bucket routing, use rigging.filesystem.buckets.filesystem_for(url).

© marin-community, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in .agents/skills/use-fsutil of marin-community/marin.

  • SKILL.md
  • agents/openai.yaml

Open the folder on GitHubat commit c468793

Compare with similar skills

Use Fsutil 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.

Use Fsutil compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Use Fsutil this skillmarin-community/marin3.9k—~242Automated safety check: PassApache-2.0
Stripe Projectsfossasia/eventyay1.7k5 repos~2kAutomated safety check: NotesApache-2.0
FoundatioFoundatioFx/Foundatio2.1k—~3.9kAutomated safety check: PassApache-2.0
Spatialduckdb/duckdb-skills6031 repos~1kAutomated safety check: NotesMIT
R Oopab604/claude-code-r-skills2072 repos~1.9kAutomated safety check: PassMIT
Edgestore Setupedgestorejs/edgestore454—~1.8kAutomated safety check: PassMIT

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Categories

Questions about Use Fsutil

What does Use Fsutil do?

Use Marin's fsutil CLI for local object-storage operations across GCS, CoreWeave S3, R2, and local paths. Use Fsutil is an agent skill from marin-community/marin. Use Marin's fsutil CLI for local object-storage operations across GCS, CoreWeave S3, R2, and local paths.

When should I use Use Fsutil?

Use Fsutil fits situations like: A task needs to list; remove data at gs://; S3:// URLs from a checkout.

How do I install Use Fsutil in Claude Code?

Run `npx skills add marin-community/marin --skill use-fsutil -a claude-code`. Or copy the skill folder (.agents/skills/use-fsutil in marin-community/marin) into .claude/skills/use-fsutil in your project. Claude Code loads it when a task matches its description.

How do I install Use Fsutil in Codex?

Run `npx skills add marin-community/marin --skill use-fsutil -a codex`. Or copy the skill folder (.agents/skills/use-fsutil in marin-community/marin) into .agents/skills/use-fsutil in your project. Codex loads it when a task matches its description.

Can I use Use Fsutil 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 marin-community/marin --skill use-fsutil -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/use-fsutil, .gemini/skills/use-fsutil, .github/skills/use-fsutil and .opencode/skills/use-fsutil in your project.

What does Use Fsutil need to run?

Going by SKILL.md and its folder, Use Fsutil needs the command-line tools its instructions call (uv). Our summary lists: Python 3.

Does Use Fsutil access the network?

SKILL.md contains no URLs. Its commands use uv, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Use Fsutil 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 Use Fsutil use?

Use Fsutil is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Use Fsutil use?

About 242 tokens (SKILL.md is roughly 968 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 Use Fsutil?

Skills that share tags, products or a category with Use Fsutil: Stripe Projects (fossasia/eventyay, 1.7k stars), Foundatio (FoundatioFx/Foundatio, 2.1k stars), Spatial (duckdb/duckdb-skills, 603 stars) and R Oop (ab604/claude-code-r-skills, 207 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Use Fsutil?

marin-community (a GitHub organization) maintains it in marin-community/marin, which has 3,921 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 10, 2026.

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