devsandbox-config

devsandbox-config is a skill for Claude Code from zekker6/devsandbox. It costs 208 tokens per session (2,228 once invoked), scanned A, original, MIT.

A documentation-based guide for configuring devsandbox, a sandbox that controls how an AI coding assistant accesses tools, files, and network services. It answers which TOML settings to use, where to put them, and how configuration files combine.

In plain words
What is it for?
It helps answer setup questions about proxy mode, HTTP filtering, credential injection, content redaction, isolation backends, and other documented options.
Why use it?
It prevents configuration mistakes caused by guessing setting names or values. This matters because devsandbox may silently ignore unknown settings.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions Claude Code; mentions Codex; built for aider.

Part of the devsandbox-config plugin — 1 skill shipped together

Good fit It helps answer setup questions about proxy mode, HTTP filtering, credential injection, content redaction, isolation backends, and other documented options.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zekker6/devsandbox/devsandbox-config
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 zekker6/devsandbox --skill devsandbox-config
Clone the repo
git clone --depth 1 https://github.com/zekker6/devsandbox

Made for: Claude Code.

Or install devsandbox-config, the plugin that ships this one along with the rest of its 1 skill.

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 devsandbox-config

README.md
[![agentmods](https://agentmods.dev/badge/skills/zekker6/devsandbox/devsandbox-config/github.svg)](https://agentmods.dev/skills/zekker6/devsandbox/devsandbox-config)
Your own site
<a href="https://agentmods.dev/skills/zekker6/devsandbox/devsandbox-config"><img src="https://agentmods.dev/badge/skills/zekker6/devsandbox/devsandbox-config/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 devsandbox-config

Your own site · 80×15
<a href="https://agentmods.dev/skills/zekker6/devsandbox/devsandbox-config"><img src="https://agentmods.dev/badge/skills/zekker6/devsandbox/devsandbox-config.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 208 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,228 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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 $0.00208 $0.02228
Opus 5.5 $0.00083 $0.00891
Sonnet 5.5 $0.00042 $0.00446
Haiku 4.5 $0.00021 $0.00223

Measured 1mo ago against content hash c90dca54f0c0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

devsandbox-config 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 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.

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.

.claude-plugin/devsandbox-config/skills/devsandbox-config/SKILL.md · 109 lines

How it starts

The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.

devsandbox configuration

Answer configuration questions from the devsandbox documentation, fetched at the time you answer.

The one rule

Every section, key and value you name must come from a source you read in this session.

devsandbox ignores a key it does not recognize rather than rejecting it, so an invented key produces a config that looks applied and does nothing. A guess here is worse than no answer. If you cannot find a setting, say it does not exist and name where you looked. Never derive a key from a similar one - keep_container has no keep_containers, and [tools.git] taking mode does not mean [tools.docker] does.

If the documentation cannot be fetched, say so and stop. No network means no grounding, and answering from memory is the failure this skill exists to prevent. Offer the local alternatives below instead.

Sources, most authoritative first

  1. A devsandbox checkout, if one is at hand. When the working directory is the devsandbox repository, read docs/*.md directly - those match the code in front of you, and grep -n 'toml:"' internal/config/config.go lists every key of the fixed schema. Prefer this over fetching.

  2. The user's own machine, for anything that depends on their setup rather than on what the software supports:

    devsandbox config path        # where the global config lives
    devsandbox config show        # the resolved configuration, after merging
    devsandbox doctor             # installation, backend, firewall and config health
    devsandbox tools list         # which tools are detected here
    devsandbox tools info <tool>  # what a tool binds and what it accepts
    devsandbox filter show        # active HTTP filter rules
    devsandbox trust list         # directories whose .devsandbox.toml is trusted
    devsandbox --version          # compare against the docs, see "Version skew"
    
  3. The published documentation, via WebFetch. This is the normal path.

Fetching the documentation

Read the full file on GitHub · 109 lines

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 · 109 lines · 208 tokens per session scan A c90dca54f0c0

Subscribe to this mod's changes

devsandbox-config is a skill published in the GitHub repository zekker6/devsandbox (13 stars, last pushed yesterday), licensed MIT. It adds 208 tokens to every session and 2,228 once invoked, about $0.0008 per session on Opus 5.5. 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 2026-08-31.

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