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Sandbox Claude Inside

Category: General  ·  Sub-category: general-misc  ·  Last updated:
ai:claude
Run Claude Code INSIDE a ca-sandbox box (`--with-claude`). Routed to when the user wants an agent loop running against an isolated, ephemeral sandbox rather than the host. Authenticates via an env-injected CLAUDE_CODE_OAUTH_TOKEN with no host bind of ~/.claude; the image pins the CLI and disables the autoupdater; HOME is backed by a named volume so the .claude state persists across restart. Five gated phases — posture, image, token, run, teardown. The hard default is offline or Anthropic-domains-only egress, and the token volume is NEVER co-mounted with an untrusted-code run; both are enforced, not advised.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Put Claude Code in the box, not the box on your machine. --with-claude runs the CLI inside a host-FS-isolated ca-sandbox container, authenticating from an env-injected token with no host bind of ~/.claude — the mechanism proven by Spike B (.codearbiter/spikes/ca-sandbox-claude-auth.md, CONFIRM-07). It is the deliberately-hardened lane: a token in a box is stealable, so the posture is locked down by construction (offline or Anthropic-only egress, token volume never shared with untrusted code), never left to operator discipline.

What this skill does

Sandbox Claude Inside 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/sandbox-claude-inside/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Sandbox Claude Inside 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 196,000+ 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/sandbox-claude-inside
curl -L https://claudskills.com/skills/sandbox-claude-inside/SKILL.md \
  -o ~/.claude/skills/sandbox-claude-inside/SKILL.md

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

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

Telegram

📱 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 Sandbox Claude Inside Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/sandbox-claude-inside/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Sandbox Claude Inside skill do?
Run Claude Code INSIDE a ca-sandbox box (`--with-claude`). Routed to when the user wants an agent loop running against an isolated, ephemeral sandbox rather than the host. Authenticates via an env-injected CLAUDE_CODE_OAUTH_TOKEN with no host bind of ~/.claude; the image pins the CLI and disables the autoupdater; HOME is backed by a named volume so the .claude state persists across restart. Five gated phases — posture, image, token, run, teardown. The hard default is offline or Anthropic-domains-only egress, and the token volume is NEVER co-mounted with an untrusted-code run; both are enforced, not advised.
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 Sandbox Claude Inside skill?
Use Sandbox Claude Inside 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 Sandbox Claude Inside" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Sandbox Claude Inside 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. Sandbox Claude Inside 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

Cite this skill

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

APA
arbiterForge. (2026). Sandbox Claude Inside [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/sandbox-claude-inside/
BibTeX
@misc{sandbox-claude-inside-2026,
  author    = {arbiterForge},
  title     = {Sandbox Claude Inside [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/sandbox-claude-inside/}
}

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Security scan

Grade A · scanned 2026-09-28 — 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 ›

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