expose-localhost-tunnel SKILL.md skillB
expose-localhost-tunnel from ariana-dot-dev/cloud-sandbox-vm-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ariana-dot-dev/cloud-sandbox-vm-skills/expose-localhost-tunnel@git:20261109.2f1d005Pins git:20261109.2f1d005 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ariana-dot-dev/cloud-sandbox-vm-skills
- Path
skills/expose-localhost-tunnel/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261109.2f1d005, committed Nov 9, 2026
- First version recorded
- Jun 13, 2026
- Size
- 2,007 bytes
- Repository stars
- 3
- License
- MIT
Tunnel/expose a localhost service to the internet from inside a cloud VM — get a stable public HTTPS URL (https://<box>-<port>.on.ascii.dev) with TLS and token-gating built in, no separate daemon or account like ngrok. Raw TCP/UDP ports open on the VM's own IP address (IPv6 on some sandboxes). Use to share a preview, expose a webhook target, or open a port.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Expose / tunnel localhost (Box) Use this when a service running in a Box must be **reachable from outside**: sharing a dev preview, receiving webhooks, or demoing. Because the service already runs *inside* the VM, exposing it is one command — no `ngrok`-style sidecar, no extra account, no cert setup. ## Recipe ```bash box ssh "$box_id" -- "cd /app && PORT=3000 npm start &" # MUST bind 0.0.0.0 box ssh "$box_id" -- "host 3000 --title preview" box ssh "$box_id" -- "host url 3000" # -> https://<box>-3000.on.ascii.dev?_token=... box ssh "$box_id" -- "host list" # manage; host hide <port> to revoke ``` Ascii terminates TLS for `on.ascii.dev` and proxies to the box. URLs are **token-gated by default** (`--public` drops the token, `--private` enforces it). Up to 50 public HTTPS URLs per box. ## Why Box beats a tunnel tool - No separate daemon/account — the route lives with the VM. - TLS + auth handled; URL stable across the box's life, also after resume. …
Read the whole file at its exact version.
How to install
mdr add ariana-dot-dev/cloud-sandbox-vm-skills/expose-localhost-tunnel@sha256:d2edaf251490d0b5The line at the top of this page pins the label git:20261109.2f1d005, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ej2rxz4q5xskn2lc)
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Versions
The registry has recorded 2 versions of this file, between Jun 13, 2026 and Nov 9, 2026, about one every 149 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261109.2f1d005 latest | 2026-11-09 | 2f1d005 | 2,007 B | B | view · diff |
| git:20260613.95ab83b | 2026-06-13 | 95ab83b | 1,766 B | B | view |
Audit of the latest version
- fail: No curl or wget piped into a shell (matched: curl -fsSL https://box.ascii.dev/install | sh)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2007 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
ariana-dot-dev/cloud-sandbox-vm-skills · 3 stars · license MIT · pushed 2026-11-09 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_ej2rxz4q5xskn2lc GET https://markdownregistry.com/api/v1/resolve?ref=ariana-dot-dev/cloud-sandbox-vm-skills/expose-localhost-tunnel GET https://markdownregistry.com/api/v1/blob/d2edaf251490d0b5c2fc491936c680c5981bea93e20c819cf5b351ae40a2b6f9
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.