Overlayfs Runtime Isolation

Q: What is a Claude Code skill and how does the Overlayfs Runtime Isolation skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Overlayfs Runtime Isolation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-06-04

Isolate agent file-system writes using OverlayFS and bubblewrap (bwrap). Core directories mounted read-only; all agent writes go to RAM-backed tmpfs. Zero persistence on session end. Anti-graffiti immutable surface pattern.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Mount core infrastructure as read-only (lowerdir) and redirect all agent writes to ephemeral RAM (upperdir = tmpfs). On session close, tmpfs is discarded — disk never touched.

What this skill does

Overlayfs Runtime Isolation is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/overlayfs-runtime-isolation/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Overlayfs Runtime Isolation Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 174,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/overlayfs-runtime-isolation
curl -L https://claudskills.com/skills/overlayfs-runtime-isolation/SKILL.md \
  -o ~/.claude/skills/overlayfs-runtime-isolation/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/overlayfs-runtime-isolation/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/overlayfs-runtime-isolation/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\overlayfs-runtime-isolation\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Overlayfs Runtime Isolation Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/overlayfs-runtime-isolation/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Overlayfs Runtime Isolation skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Overlayfs Runtime Isolation skill?

Use Overlayfs Runtime Isolation when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Overlayfs Runtime Isolation" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Overlayfs Runtime Isolation skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Overlayfs Runtime Isolation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/phamlongh230-lgtm/yamtam-engine/blob/HEAD/.claude/skills/overlayfs-runtime-isolation/SKILL.md
Author: phamlongh230-lgtm

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

phamlongh230-lgtm. (2026). Overlayfs Runtime Isolation [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/overlayfs-runtime-isolation/

BibTeX

@misc{overlayfs-runtime-isolation-2026,
  author    = {phamlongh230-lgtm},
  title     = {Overlayfs Runtime Isolation [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/overlayfs-runtime-isolation/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/overlayfs-runtime-isolation.svg)](https://claudskills.com/skills/overlayfs-runtime-isolation/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-08-02 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/overlayfs-runtime-isolation/#security)

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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