What is sandbox-exe-dev?

A command-line workflow for operating persistent Linux virtual machines through SSH or HTTPS for code execution and file work.

Use it to create and manage persistent development VMs, run code, transfer files, share web services, access the environment through SSH, resize or snapshot it, and use its authenticated HTTPS proxy.

It provides a reusable remote development environment whose disks remain available between sessions, instead of relying only on temporary sandboxes.

How disler/inkwell-agent-sandboxes-and-software-factory configures Cla

Reuse

Borrowing it

Nothing to install: this file belongs to disler/inkwell-agent-sandboxes-and-software-factory. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/disler/inkwell-agent-sandboxes-and-software-factory/main/.claude/skills/sandbox-exe-dev/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/disler/inkwell-agent-sandboxes-and-software-factory

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/disler/inkwell-agent-sandboxes-and-software-factory/sandbox-exe-dev/github.svg)](https://agentmods.dev/skills/disler/inkwell-agent-sandboxes-and-software-factory/sandbox-exe-dev)

Your own site

<a href="https://agentmods.dev/skills/disler/inkwell-agent-sandboxes-and-software-factory/sandbox-exe-dev"><img src="https://agentmods.dev/badge/skills/disler/inkwell-agent-sandboxes-and-software-factory/sandbox-exe-dev/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/disler/inkwell-agent-sandboxes-and-software-factory/sandbox-exe-dev"><img src="https://agentmods.dev/badge/skills/disler/inkwell-agent-sandboxes-and-software-factory/sandbox-exe-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,416 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00064	$0.05416
Opus 5	$0.00032	$0.02708
Sonnet 5	$0.00013	$0.01083
Haiku 4.5	$0.00006	$0.00542

Measured 11d ago against content hash 61bd9644ca43, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade C, and why

sandbox-exe-dev scanned grade C with 2 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 11d ago.

The scan reads SKILL.md. This mod also ships 13 executable files (exedev_cli/src/__init__.py, exedev_cli/src/commands/__init__.py, exedev_cli/src/commands/browser.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.

Reaches for credential fileshighPrivilege escalation

SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.

- Permission denied? Make sure your SSH public key is registered: `cat ~/.ssh/id_ed25519.pub | ssh exe.dev ssh-key add`.

Makes network callslowCapability

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

curl https://<vm_name>.exe.xyz/

.claude/skills/sandbox-exe-dev/SKILL.md · 343 lines

How it starts

The opening of the file, as written. The whole thing — 343 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Sandboxes (exe.dev)

This skill is the persistent-VM cousin of /agent-sandboxes (the E2B skill, installed globally at ~/.claude/skills/agent-sandboxes/). It gives an agent the same ergonomic CLI surface (exedev init, exedev exec, exedev files, exedev share, exedev browser) but backs it with exe.dev's persistent VMs over SSH instead of E2B's ephemeral sandboxes.

If you already know /agent-sandboxes, the sbx → exedev mapping below covers 90% of the muscle memory. The 10% that doesn't translate is documented honestly — pause, extend-lifetime, and template registries don't exist on exe.dev; in exchange you get persistent disks, live resize, whole-VM snapshot, and an auth-gated HTTPS proxy.

Variables

EXEDEV_CLI_PATH: .claude/skills/sandbox-exe-dev/exedev_cli/
LOCAL_WORKSPACE: tmp/<workflow_id>/ — local staging for files to upload/download. Create when needed.
WORKFLOW_ID: kebab-case identifier for the current task. Generate as <task>-<YYYYMMDD>-<short-uuid> if the user doesn't provide one (e.g. todo-app-20260508-7f3a). The VM name should derive from this.
TIMEOUT_DURATION_IN_SECONDS: N/A on exe.dev — VMs are persistent and never auto-expire. Tear down with exedev vm kill <name> when truly done.

Prerequisites

Before using this skill, validate the environment:

Check SSH access to exe.dev:
```
cd EXEDEV_CLI_PATH
uv run exedev doctor
```
Expected output ends with doctor: OK. If it doesn't:
- First-ever SSH? Verify the host-key fingerprint matches SHA256:JJOP/lwiBGOMilfONPWZCXUrfK154cnJFXcqlsi6lPo (source: ai_docs/exedev/faq-host-key.md).
- Permission denied? Make sure your SSH public key is registered: cat ~/.ssh/id_ed25519.pub | ssh exe.dev ssh-key add.
- Wrong key picked up? Add a stanza to ~/.ssh/config:
```
Host exe.dev *.exe.xyz
  IdentitiesOnly yes
  IdentityFile ~/.ssh/id_ed25519_exe
```

Verify the CLI is installed:

cd EXEDEV_CLI_PATH
uv sync --quiet
uv run exedev --help

Read the full file on GitHub · 343 lines

Files

What ships with it

19 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.

11d ago First seen · 343 lines · 64 tokens per session scan C 61bd9644ca43

Subscribe to this mod's changes

sandbox-exe-dev is a skill published in the GitHub repository disler/inkwell-agent-sandboxes-and-software-factory (154 stars, last pushed 1mo ago), licensed MIT. It adds 64 tokens to every session and 5,416 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (reaches for credential files, 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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inkwell-agent-sandboxes-and-software-factory: Skill for Claude Code