using-exe-dev

using-exe-dev is a skill for Claude Code, Codex from jkomyno/.dotfiles. It costs 33 tokens per session (453 once invoked), scanned C, original, MIT.

A skill for managing exe.dev, a service that provides Linux virtual machines with persistent storage, HTTPS addresses, and built-in authentication. It uses SSH, a secure command-line connection method, to create, list, connect to, configure, and delete those machines.

In plain words
What is it for?
Use it when creating or managing exe.dev virtual machines, connecting to them, transferring files, or accessing their HTTPS addresses.
Why use it?
It gives the agent a documented way to work with exe.dev machines from command-line or restricted environments.

Skill for Claude CodeCodex

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/jkomyno/.dotfiles/using-exe-dev
Any agent
npx skills add jkomyno/.dotfiles --skill using-exe-dev
Clone the repo
git clone --depth 1 https://github.com/jkomyno/.dotfiles

Made for: Claude Code, Codex.

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 using-exe-dev

README.md
[![agentmods](https://agentmods.dev/badge/skills/jkomyno/.dotfiles/using-exe-dev.svg)](https://agentmods.dev/skills/jkomyno/.dotfiles/using-exe-dev)
Your own site
<a href="https://agentmods.dev/skills/jkomyno/.dotfiles/using-exe-dev"><img src="https://agentmods.dev/badge/skills/jkomyno/.dotfiles/using-exe-dev.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 453 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
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 $0.00033 $0.00453
Opus 5 $0.00016 $0.00227
Sonnet 5 $0.00007 $0.00091
Haiku 4.5 $0.00003 $0.00045

Measured 5d ago against content hash bea637a5e35b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

using-exe-dev scanned grade C with 1 finding 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 5d 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.

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.

IdentityFile ~/.ssh/id_ed25519
target/home/.agents/skills/using-exe-dev/SKILL.md · 51 lines

What it actually says

About

exe.dev provides Linux VMs with persistent disks, instant HTTPS, and built-in auth. All management is via SSH.

Documentation

The index is organized for progressive discovery: start there and follow links as needed.

Quick reference

ssh exe.dev help             # show commands
ssh exe.dev help <command>   # show command details
ssh exe.dev new --json       # create VM
ssh exe.dev ls --json        # list VMs
ssh exe.dev rm <vm>          # delete VM
ssh <vm>.exe.xyz             # connect to VM
scp file.txt <vm>.exe.xyz:~/ # transfer file

Every VM gets https://<vm>.exe.xyz/ with automatic TLS.

A tale of two SSH destinations

  • ssh exe.dev <command> — the exe.dev lobby. A REPL for VM lifecycle, sharing, and configuration. Does not support scp, sftp, or arbitrary shell commands.
  • ssh <vm>.exe.xyz — a direct connection to a VM. Full SSH: shell, scp, sftp, port forwarding, everything.

Working in non-interactive and sandboxed environments

Coding agents often run SSH in non-interactive shells or sandboxes. Common issues and workarounds:

scp/sftp failures: Ensure you're targeting <vm>.exe.xyz rather than exe.dev. Use ssh-based workarounds.

Hung connections: Non-interactive SSH can block on host key prompts with no visible output. Use -o StrictHostKeyChecking=accept-new on first connection to a new VM.

SSH config: Check whether both destinations are configured to use the right key:

Host exe.dev *.exe.xyz
  IdentitiesOnly yes
  IdentityFile ~/.ssh/id_ed25519
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. 5d ago First seen · 51 lines · 33 tokens per session scan C bea637a5e35b

Subscribe to this mod's changes

using-exe-dev is a skill published in the GitHub repository jkomyno/.dotfiles (5 stars, last pushed yesterday), licensed MIT. It adds 33 tokens to every session and 453 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (reaches for credential files). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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