sandbox-hardening

sandbox-hardening is a skill for Claude Code from itallstartedwithaidea/claude-googleadsagent. It costs 26 tokens per session (1,486 once invoked), scanned C, original, no licence file.

A set of controls for isolating coding-agent work in sandboxes, such as containers with limited permissions, resources, and network access.

In plain words
What is it for?
Use it to separate agent processes, limit CPU or memory use, control permissions, and segment network connections.
Why use it?
It reduces the damage an agent or its code could cause by restricting what the execution environment can access.

Skill for Claude Code

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

Part of the googleadsagent plugin — 77 skills, 7 commands, 7 agents, 2 hooks, 2 MCP servers shipped together

Good fit Use it to separate agent processes, limit CPU or memory use, control permissions, and segment network connections.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening
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 itallstartedwithaidea/claude-googleadsagent --skill sandbox-hardening
Clone the repo
git clone --depth 1 https://github.com/itallstartedwithaidea/claude-googleadsagent

Made for: Claude Code.

Or install googleadsagent, the plugin that ships this one along with the rest of its 77 skills, 7 commands, 7 agents, 2 hooks, 2 MCP servers.

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-hardening

README.md
[![agentmods](https://agentmods.dev/badge/skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening/github.svg)](https://agentmods.dev/skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening)
Your own site
<a href="https://agentmods.dev/skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening"><img src="https://agentmods.dev/badge/skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening/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-hardening

Your own site · 80×15
<a href="https://agentmods.dev/skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening"><img src="https://agentmods.dev/badge/skills/itallstartedwithaidea/claude-googleadsagent/sandbox-hardening.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,486 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 4 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 $0.00026 $0.01486
Opus 5.5 $0.00010 $0.00594
Sonnet 5.5 $0.00005 $0.00297
Haiku 4.5 $0.00003 $0.00149

Measured 1mo ago against content hash fedb3ee62184, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

sandbox-hardening scanned grade C with 4 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 1mo 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.

Asks for rootlowPrivilege escalation

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

"curl | sh", "wget | bash", "chmod 777",

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Downloads and executes remote codemediumSupply chain

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

"curl | sh", "wget | bash", "chmod 777",

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Recursive force deletemediumDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

"rm -rf /", "mkfs", "dd if=", "> /dev/sd",

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

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

"curl | sh", "wget | bash", "chmod 777",
skills/sandbox-hardening/SKILL.md · 170 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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. 1mo ago First seen · 170 lines · 26 tokens per session scan C fedb3ee62184

Subscribe to this mod's changes

sandbox-hardening is a skill published in the GitHub repository itallstartedwithaidea/claude-googleadsagent (2 stars, last pushed 3mo ago), with no licence file. It adds 26 tokens to every session and 1,486 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 4 findings (asks for root, downloads and executes remote code, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.