sandbox-claude-inside

sandbox-claude-inside is a skill for Claude Code from arbiterForge/codeArbiter. It costs 148 tokens per session (2,444 once invoked), scanned A, original, AGPL-3.0.

A way to run Claude Code inside an isolated, temporary Docker sandbox instead of on the host machine. Claude Code is a command-line coding assistant.

In plain words
What is it for?
Use it to run an agent loop against code inside a sandbox with controlled access and temporary storage.
Why use it?
It limits the assistant's access to the host filesystem while it works with an untrusted repository.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the ca-sandbox plugin — 2 skills, 5 commands shipped together

Good fit Use it to run an agent loop against code inside a sandbox with controlled access and temporary storage.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/arbiterforge/codearbiter/sandbox-claude-inside
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add arbiterForge/codeArbiter --skill sandbox-claude-inside
Clone the repo
git clone --depth 1 https://github.com/arbiterForge/codeArbiter

Made for: Claude Code.

Or install ca-sandbox, the plugin that ships this one along with the rest of its 2 skills, 5 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for sandbox-claude-inside

README.md
[![agentmods](https://agentmods.dev/badge/skills/arbiterforge/codearbiter/sandbox-claude-inside/github.svg)](https://agentmods.dev/skills/arbiterforge/codearbiter/sandbox-claude-inside)
Your own site
<a href="https://agentmods.dev/skills/arbiterforge/codearbiter/sandbox-claude-inside"><img src="https://agentmods.dev/badge/skills/arbiterforge/codearbiter/sandbox-claude-inside/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for sandbox-claude-inside

Your own site · 80×15
<a href="https://agentmods.dev/skills/arbiterforge/codearbiter/sandbox-claude-inside"><img src="https://agentmods.dev/badge/skills/arbiterforge/codearbiter/sandbox-claude-inside.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 148 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,444 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00148 $0.02444
Opus 5 $0.00074 $0.01222
Sonnet 5 $0.00030 $0.00489
Haiku 4.5 $0.00015 $0.00244

Measured 9d ago against content hash 56db335f22ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

sandbox-claude-inside scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/ca-sandbox/skills/sandbox-claude-inside/SKILL.md · 167 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 167 lines · 148 tokens per session scan A 56db335f22ab

Subscribe to this mod's changes

sandbox-claude-inside is a skill published in the GitHub repository arbiterForge/codeArbiter (144 stars, last pushed 2d ago), licensed AGPL-3.0. It adds 148 tokens to every session and 2,444 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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