Apple Container
sickn33/agentic-awesome-skills
Build, run, and manage OCI/Linux containers as lightweight per-container VMs on Apple-silicon macOS using Apple's open-source container CLI, no Docker daemon required.
Reference the Tar/USTAR/PAX/GNU tar archive container format.
MITAuto-check passed
Install Tar Format
$ npx skills add adamhathcock/sharpcompress --skill tar-format -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install adamhathcock/sharpcompress tar-format --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/adamhathcock/sharpcompress.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/tar-format .claude/skills/tar-format && rm -rf skills-srcUse ~/.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/
Install the "tar-format" agent skill from https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-format into .claude/skills/tar-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tar-format", 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 install https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-formatType 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.
$ npx skills add adamhathcock/sharpcompress --skill tar-format -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install adamhathcock/sharpcompress tar-format --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/adamhathcock/sharpcompress.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/tar-format .agents/skills/tar-format && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "tar-format" agent skill from https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-format into .agents/skills/tar-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tar-format", 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.
$ npx skills add adamhathcock/sharpcompress --skill tar-format -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install adamhathcock/sharpcompress tar-format --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/adamhathcock/sharpcompress.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/tar-format .cursor/skills/tar-format && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "tar-format" agent skill from https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-format into .cursor/skills/tar-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tar-format", 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 https://github.com/adamhathcock/sharpcompress.git --path .agents/skills/tar-format--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add adamhathcock/sharpcompress --skill tar-format -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install adamhathcock/sharpcompress tar-format --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/adamhathcock/sharpcompress.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/tar-format .gemini/skills/tar-format && rm -rf skills-srcUse ~/.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/
Install the "tar-format" agent skill from https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-format into .gemini/skills/tar-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tar-format", 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.
$ gh skill install adamhathcock/sharpcompress tar-formatInstalls 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).
$ npx skills add adamhathcock/sharpcompress --skill tar-format -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/adamhathcock/sharpcompress.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/tar-format .github/skills/tar-format && rm -rf skills-srcUse ~/.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/
Install the "tar-format" agent skill from https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-format into .github/skills/tar-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tar-format", 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.
$ npx skills add adamhathcock/sharpcompress --skill tar-format -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install adamhathcock/sharpcompress tar-format --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/adamhathcock/sharpcompress.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/tar-format .opencode/skills/tar-format && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "tar-format" agent skill from https://github.com/adamhathcock/sharpcompress/tree/master/.agents/skills/tar-format into .opencode/skills/tar-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tar-format", 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
tar-format- GitHub stars
- 2.6k
- Token cost
- ~499 tokens
- SKILL.md length
- 201 words
- Files
- 2 (incl. references)
- Skills in repo
- 5
- Repo updated
- First seen
- Licence
- MIT
At a glance
Reference the Tar/USTAR/PAX/GNU tar archive container format.
- Works in 5 steps: Identify which layer is involved: raw… → Open the relevant section in… → For parsing changes, cross-check… → …
- An AI agent needs to answer questions
- SKILL.md covers Reference and Workflow
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Tar Format is an agent skill from adamhathcock/sharpcompress. Reference the Tar/USTAR/PAX/GNU tar archive container format. Use when an AI agent needs to answer questions or make code changes involving tar headers, 512-byte blocks, checksums, typeflags, USTAR prefixes, PAX local/global extended headers, GNU long names/links, sparse entries, wrapper compression, or SharpCompress Tar parsing and writing behavior.
Its SKILL.md is about 500 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/tar-format.md`).
The repository describes itself as: SharpCompress is a fully managed C library to deal with many compression types and formats. The licence is MIT.
When your agent uses it
- An AI agent needs to answer questions
- Make code changes involving tar headers
- 512-byte blocks
- PAX local/global extended headers
Example prompts
- “/tar-format”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Identify which layer is involved: raw tar block/header parsing, POSIX USTAR fields, POSIX PAX metadata, GNU tar extensions, wrapper…
- Open the relevant section in references/tar-format.md and use the source-file pointers before changing code.
- For parsing changes, cross-check TarHeader.cs, TarHeader.Async.cs, EntryType.cs, and matching sync/async tests.
- For writer changes, verify both sync and async file/directory paths and TarWriterOptions.HeaderFormat behavior.
- For support claims, keep unsupported features explicit: PAX write, sparse reconstruction, device/FIFO semantics, link-writing APIs, and…
What it can do on your machine
Read from SKILL.md and the folder at commit eab8154. 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.
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
Tar Format loads about 499 tokens when it runs, and up to ~4k if it reads all its reference files. Until then it costs about 91 tokens; SKILL.md has 201 words of instructions outside code blocks.
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 adamhathcock/sharpcompress at commit eab8154, republished under its MIT licence (© adamhathcock). 201 words, ~499 tokens.
Download SKILL.mdSave it as
.claude/skills/tar-format/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- tar-format
- description
- Reference the Tar/USTAR/PAX/GNU tar archive container format. Use when an AI agent needs to answer questions or make code changes involving tar headers, 512-byte blocks, checksums, typeflags, USTAR prefixes, PAX local/global extended headers, GNU long names/links, sparse entries, wrapper compression, or SharpCompress Tar parsing and writing behavior.
Tar Format
Use this skill for tar container-format work. It provides a local, SharpCompress-oriented reference for POSIX USTAR, POSIX PAX, GNU tar extensions, and the current SharpCompress Tar implementation.
Reference
- Read references/tar-format.md when the task depends on tar binary layout, header field offsets, typeflag behavior, checksum rules, PAX records, GNU long-name/link records, wrapper compression support, or current SharpCompress Tar support boundaries.
- Treat the reference as an implementation guide, not a standards replacement. It cites POSIX and GNU tar sources, but it also documents SharpCompress-specific behavior and limitations.
- Prefer the SharpCompress support matrix in the reference over generic tar assumptions when changing code. Tar dialect support is intentionally partial in some areas.
Workflow
- Identify which layer is involved: raw tar block/header parsing, POSIX USTAR fields, POSIX PAX metadata, GNU tar extensions, wrapper compression, reader/archive/writer API behavior, or tests.
- Open the relevant section in
references/tar-format.mdand use the source-file pointers before changing code. - For parsing changes, cross-check
TarHeader.cs,TarHeader.Async.cs,EntryType.cs, and matching sync/async tests. - For writer changes, verify both sync and async file/directory paths and
TarWriterOptions.HeaderFormatbehavior. - For support claims, keep unsupported features explicit: PAX write, sparse reconstruction, device/FIFO semantics, link-writing APIs, and writing
tar.xz,tar.zst, ortar.Z.
© adamhathcock, MIT. 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 (references) in .agents/skills/tar-format of adamhathcock/sharpcompress.
- SKILL.md
- references/tar-format.md
Open the folder on GitHubat commit eab8154
Compare with similar skills
Tar Format 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Tar Format this skilladamhathcock/sharpcompress | 2.6k | — | ~499 | Automated safety check: Pass | MIT | |
| Apple Containersickn33/agentic-awesome-skills | 47k | 1 repos | ~2.5k | Automated safety check: Pass | Apache-2.0 | |
| Container Security Hardeningsickn33/agentic-awesome-skills | 47k | 1 repos | ~1k | Automated safety check: Notes | MIT | |
| Container Queriesthedaviddias/Front-End-Checklist | 74k | — | ~526 | Automated safety check: Pass | MIT | |
| CSS Containmentthedaviddias/Front-End-Checklist | 74k | — | ~512 | Automated safety check: Pass | MIT | |
| Detecting Container Escape Attemptsmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~2.9k | Automated safety check: Pass | Apache-2.0 |
Similar skills
Container Security Hardening
sickn33/agentic-awesome-skills
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Container Queries
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use container queries for component-level responsiveness.
CSS Containment
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope.
Detecting Container Escape Attempts
mukul975/Anthropic-Cybersecurity-Skills
Detects container escape at runtime across tooling - namespace manipulation, capability abuse, kernel exploits, sensitive host mounts, and anomalous syscalls - and explains which signals matter…
Performing Container Escape Detection
mukul975/Anthropic-Cybersecurity-Skills
Audits container and pod configuration for escape-enabling misconfiguration using the Kubernetes Python client - privileged flags, dangerous capability grants, host path mounts, shared namespaces…
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Xz Lzma Format
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Zip Format
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Reference the ZIP/ZIP64/PKWARE APPNOTE archive container format.
Sevenzip Format
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Questions about Tar Format
What does Tar Format do?
Reference the Tar/USTAR/PAX/GNU tar archive container format. Tar Format is an agent skill from adamhathcock/sharpcompress. Reference the Tar/USTAR/PAX/GNU tar archive container format.
When should I use Tar Format?
Tar Format fits situations like: an AI agent needs to answer questions; make code changes involving tar headers; 512-byte blocks; PAX local/global extended headers.
How do I install Tar Format in Claude Code?
Run `npx skills add adamhathcock/sharpcompress --skill tar-format -a claude-code`. Or copy the skill folder (.agents/skills/tar-format in adamhathcock/sharpcompress) into .claude/skills/tar-format in your project. Claude Code loads it when a task matches its description.
How do I install Tar Format in Codex?
Run `npx skills add adamhathcock/sharpcompress --skill tar-format -a codex`. Or copy the skill folder (.agents/skills/tar-format in adamhathcock/sharpcompress) into .agents/skills/tar-format in your project. Codex loads it when a task matches its description.
Can I use Tar Format 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 adamhathcock/sharpcompress --skill tar-format -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tar-format, .gemini/skills/tar-format, .github/skills/tar-format and .opencode/skills/tar-format in your project.
What does Tar Format need to run?
SKILL.md names no scripts, command-line tools or credentials: Tar Format is instructions for the agent only.
Does Tar Format 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 Tar Format 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 Tar Format use?
Tar Format is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Tar Format use?
About 499 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. Its references folder adds about 3.5k tokens, read only when the agent opens those files.
What are the alternatives to Tar Format?
Skills that share tags, products or a category with Tar Format: Apple Container (sickn33/agentic-awesome-skills, 47k stars), Container Security Hardening (sickn33/agentic-awesome-skills, 47k stars), Container Queries (thedaviddias/Front-End-Checklist, 74k stars) and CSS Containment (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Tar Format?
adamhathcock (a GitHub user) maintains it in adamhathcock/sharpcompress, which has 2,589 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 9, 2026.
Source: adamhathcock/sharpcompress on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.