browser-preview SKILL.md skillC
browser-preview from starchild-ai-agent/official-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add starchild-ai-agent/official-skills/browser-preview@v1.1.2Pins v1.1.2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- C, 15 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- starchild-ai-agent/official-skills
- Path
browser-preview/SKILL.md- Versions recorded
- 4
- Latest version
- v1.1.2, committed Jul 24, 2026
- First version recorded
- Mar 13, 2026
- Size
- 9,631 bytes
- Repository stars
- 32
- License
- none declared
Preview panel and iframe diagnostics: registry, ports, paths, blank screens. Use when a preview tab is broken or missing (e.g. white screen, tab disappeared, 404 on assets, preview not loading, list running services).
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
# Browser Preview
You already know `preview_serve` and `preview_stop`. This skill fills the gap: what happens **after** preview_serve returns a URL — how the user actually sees it.
## What is the Preview Panel
The frontend has a right-side panel with two tabs: **Files** and **Preview**. The Preview tab renders preview URLs inside an iframe. When you call `preview_serve`, the frontend automatically opens a Preview tab loading that URL. (Jobs are now managed in a standalone modal accessible from the left sidebar, not in the right panel.)
Key facts:
- Each `preview_serve` call creates one Preview tab
- URL format: `https://<host>/preview/{id}/`
- Preview panel has a **⋮ menu** (top-right) showing "RUNNING SERVICES" list
- Preview tab can be **closed by the user** without stopping the backend service
- Backend service stopping → Preview tab shows an error page
## ⚠️ CRITICAL: Never Tell Users to Access localhost
**The user's browser CANNOT access `localhost` or `127.0.0.1`.** These addresses point to the server container, not the user's machine. The preview architecture uses a **reverse proxy**:
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…Read the whole file at its exact version.
How to install
mdr add starchild-ai-agent/official-skills/browser-preview@sha256:a4d3bbfbcc460c23The line at the top of this page pins the label v1.1.2, 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_lamynrtfyej6n6mq)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Mar 13, 2026 and Jul 24, 2026, about one every 44 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.1.2 latest | 2026-07-24 | 11d3911 | 9,631 B | C | view · diff |
| v1.1.1 | 2026-05-21 | 868b4d4 | 9,541 B | C | view · diff |
| v1.1.0 | 2026-04-14 | eb226a9 | 9,587 B | C | view · diff |
| v1.0.0 | 2026-03-13 | 2142113 | 9,562 B | C | view |
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1)
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9631 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 curl or wget piped into a shell
- 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
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
starchild-ai-agent/official-skills · 32 stars · license none declared · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lamynrtfyej6n6mq GET https://markdownregistry.com/api/v1/resolve?ref=starchild-ai-agent/official-skills/browser-preview GET https://markdownregistry.com/api/v1/blob/a4d3bbfbcc460c236a4e9e8bd1fb0674fa0cdb9e2a8e6cef2dcc2f0d4d777da0
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.