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Agent skill

Extract Oci Archive

by coreos in coreos/chunkah

A skill your agent uses when you need to extract an OCI archive to inspect its contents, get the rootfs layer, or read the image config.

Apache-2.0Auto-check passed

Install Extract Oci Archive

skills CLI
$ npx skills add coreos/chunkah --skill extract-oci-archive -a claude-code

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

GitHub CLI
$ gh skill install coreos/chunkah extract-oci-archive --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/coreos/chunkah.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/extract-oci-archive .claude/skills/extract-oci-archive && 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
extract-oci-archive
GitHub stars
148
Token cost
~263 tokens
SKILL.md length
49 words
Files
1
Skills in repo
4
Repo updated
First seen
Licence
Apache-2.0

At a glance

A skill your agent uses when you need to extract an OCI archive to inspect its contents, get the rootfs layer, or read the image config.

  • You need to extract an OCI archive to inspect its contents
  • SKILL.md covers Extract the OCI archive…, Get the manifest digest from…, Extract a layer to get the… and Read the image config
  • Calls jq
  • Get the rootfs layer

What it does

Extract Oci Archive is an agent skill from coreos/chunkah. Use when you need to extract an OCI archive to inspect its contents, get the rootfs layer, or read the image config.

Its SKILL.md is about 260 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: An OCI building tool for content-based layers. The licence is Apache-2.0.

When your agent uses it

  • You need to extract an OCI archive to inspect its contents
  • Get the rootfs layer
  • Read the image config

Example prompts

  • “/extract-oci-archive”

What it can do on your machine

Read from SKILL.md and the folder at commit 780bcd2. 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:

    • jq

    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

Extract Oci Archive loads about 263 tokens when it runs. Until then it costs about 34 tokens; SKILL.md has 49 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~34
When it runs · the whole SKILL.md, loaded when a task matches
~263

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 coreos/chunkah at commit 780bcd2, republished under its Apache-2.0 licence (© coreos). 49 words, ~263 tokens.

Download SKILL.mdSave it as .claude/skills/extract-oci-archive/SKILL.md (or your agent's skills folder).
name
extract-oci-archive
description
Use when you need to extract an OCI archive to inspect its contents, get the rootfs layer, or read the image config.

Extract OCI Archive

Extract the OCI archive structure

bash
mkdir /tmp/oci-extracted
tar -xf /path/to/image.ociarchive -C /tmp/oci-extracted

Get the manifest digest from index.json

bash
MANIFEST=$(jq -r '.manifests[0].digest' /tmp/oci-extracted/index.json \
    | cut -d: -f2)

Extract a layer to get the rootfs

For a single-layer image:

bash
LAYER=$(jq -r '.layers[0].digest' \
    /tmp/oci-extracted/blobs/sha256/${MANIFEST} | cut -d: -f2)
mkdir /tmp/rootfs
tar -xf /tmp/oci-extracted/blobs/sha256/${LAYER} -C /tmp/rootfs

For multi-layer images, extract each layer in order and overlay them.

Read the image config

The config contains the created timestamp, entrypoint, labels, etc.:

bash
CONFIG=$(jq -r '.config.digest' \
    /tmp/oci-extracted/blobs/sha256/${MANIFEST} | cut -d: -f2)
jq . /tmp/oci-extracted/blobs/sha256/${CONFIG}

© coreos, 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

Just SKILL.md in .agents/skills/extract-oci-archive of coreos/chunkah.

Open the folder on GitHubat commit 780bcd2

Compare with similar skills

Extract Oci Archive 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.

Extract Oci Archive compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Extract Oci Archive this skillcoreos/chunkah148—~263Automated safety check: PassApache-2.0
Extractalirezarezvani/claude-skills28k—~1.4kAutomated safety check: PassMIT
Node Inspect Debuggeropenclaw/openclaw392k1 repos~894Automated safety check: PassMIT
Brand Extractnexu-io/open-design100k—~3.1kAutomated safety check: PassApache-2.0
Design Extractnexu-io/open-design100k—~549Automated safety check: PassApache-2.0
Kg Extractruvnet/ruflo74k—~751Automated safety check: NotesMIT

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Questions about Extract Oci Archive

What does Extract Oci Archive do?

A skill your agent uses when you need to extract an OCI archive to inspect its contents, get the rootfs layer, or read the image config. Extract Oci Archive is an agent skill from coreos/chunkah. Use when you need to extract an OCI archive to inspect its contents, get the rootfs layer, or read the image config.

When should I use Extract Oci Archive?

Extract Oci Archive fits situations like: you need to extract an OCI archive to inspect its contents; get the rootfs layer; read the image config.

How do I install Extract Oci Archive in Claude Code?

Run `npx skills add coreos/chunkah --skill extract-oci-archive -a claude-code`. Or copy the skill folder (.agents/skills/extract-oci-archive in coreos/chunkah) into .claude/skills/extract-oci-archive in your project. Claude Code loads it when a task matches its description.

How do I install Extract Oci Archive in Codex?

Run `npx skills add coreos/chunkah --skill extract-oci-archive -a codex`. Or copy the skill folder (.agents/skills/extract-oci-archive in coreos/chunkah) into .agents/skills/extract-oci-archive in your project. Codex loads it when a task matches its description.

Can I use Extract Oci Archive 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 coreos/chunkah --skill extract-oci-archive -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/extract-oci-archive, .gemini/skills/extract-oci-archive, .github/skills/extract-oci-archive and .opencode/skills/extract-oci-archive in your project.

What does Extract Oci Archive need to run?

Going by SKILL.md and its folder, Extract Oci Archive needs the command-line tools its instructions call (jq).

Does Extract Oci Archive 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 Extract Oci Archive 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 Extract Oci Archive use?

Extract Oci Archive 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 Extract Oci Archive use?

About 263 tokens (SKILL.md is roughly 1.1k 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 Extract Oci Archive?

Skills that share tags, products or a category with Extract Oci Archive: Extract (alirezarezvani/claude-skills, 28k stars), Node Inspect Debugger (openclaw/openclaw, 392k stars), Brand Extract (nexu-io/open-design, 100k stars) and Design Extract (nexu-io/open-design, 100k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Extract Oci Archive?

coreos (a GitHub organization) maintains it in coreos/chunkah, which has 148 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 5, 2026.

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