Agent Sandboxes

Agent Sandboxes is a skill for Claude Code from disler/agent-sandbox-skill. It costs 0 tokens per session (4,849 once invoked), scanned D, original, no licence file.

A command-line skill for operating E2B agent sandboxes, which are isolated environments for running code and commands.

In plain words
What is it for?
Running code in isolation, testing packages, executing commands safely, and working with binary files.
Why use it?
It keeps experimental or untrusted work separate from the main system and repository.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

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.

agentmods
npx agentmods add skills/disler/agent-sandbox-skill/agent-sandboxes
Any agent
npx skills add disler/agent-sandbox-skill --skill agent-sandboxes
Clone the repo
git clone --depth 1 https://github.com/disler/agent-sandbox-skill

Made for: Claude Code.

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 Agent Sandboxes

README.md
[![agentmods](https://agentmods.dev/badge/skills/disler/agent-sandbox-skill/agent-sandboxes.svg)](https://agentmods.dev/skills/disler/agent-sandbox-skill/agent-sandboxes)
Your own site
<a href="https://agentmods.dev/skills/disler/agent-sandbox-skill/agent-sandboxes"><img src="https://agentmods.dev/badge/skills/disler/agent-sandbox-skill/agent-sandboxes.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,849 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 3 findings. Scan, not verified.
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 $0.00000 $0.04849
Opus 5 $0.00000 $0.02424
Sonnet 5 $0.00000 $0.00970
Haiku 4.5 $0.00000 $0.00485

Measured 6d ago against content hash ddb2fed12b7f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade D, and why

Agent Sandboxes scanned grade D with 3 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 6d ago.

The scan reads SKILL.md. This mod also ships 22 executable files (build_template.py, sandbox_cli/src/__init__.py, sandbox_cli/src/commands/__init__.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

--root Run as root user

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

uv run sbx exec <sandbox_id> "curl -LsSf https://astral.sh/uv/install.sh | sh" --shell --timeout 120

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

uv run sbx exec <sandbox_id> "curl -LsSf https://astral.sh/uv/install.sh | sh" --shell --timeout 120
.claude/skills/agent-sandboxes/SKILL.md · 505 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago First seen · 505 lines · 0 tokens per session scan D ddb2fed12b7f

Subscribe to this mod's changes

Agent Sandboxes is a skill published in the GitHub repository disler/agent-sandbox-skill (382 stars, last pushed 9mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 4,849 tokens. A static security scan graded it D with 3 findings (asks for root, downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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