browser-testing SKILL.md skillA
browser-testing from univers42/claude-deal-with-the-devil is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add univers42/claude-deal-with-the-devil/browser-testing@git:20260930.00e2d41Pins git:20260930.00e2d41 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- univers42/claude-deal-with-the-devil
- Path
skills/browser-testing/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260930.00e2d41, committed Sep 30, 2026
- First version recorded
- Sep 20, 2026
- Size
- 3,733 bytes
- Repository stars
- 4
- License
- none declared
Verifies a change in a real browser and returns the artifact: the steps, the viewport, the console. Use when a page is claimed to work but only a unit test says so, or when a flow must be clicked through. Auto-triggers on: "test in the browser", "does the page work", "check the console", "screenshot", "click through", "playwright", "verify the UI", "e2e test".
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 testing
A passing unit test says a function returns the right value. It does not say the page
renders, the button is reachable, or the console is clean. This closes that gap with
the only evidence that counts for a UI: the thing running.
Uses the Playwright MCP when it is available (`mcp__playwright__*`), and falls back to
Playwright in the repo otherwise.
## 1. Get it running
- `devil preflight` — a missing `.env` fails here, not after a browser is
open (`rules/run-safely.md`).
- Start the dev server **as a background task** so its log stays readable, and wait for
the port to actually answer. A fixed `sleep` is a flake generator.
- Never point a destructive flow at a real environment. Local or a disposable fixture,
always.
## 2. Drive it
```text
browser_navigate → browser_snapshot → browser_click / browser_type / browser_fill_form
→ browser_wait_for → browser_snapshot
```
- **`browser_snapshot` before `browser_click`.** The snapshot is the accessibility tree
with the refs you click by; guessing a selector is how this gets flaky.
- **Prefer role and accessible name** over CSS paths. `getByRole('button', {name:
…Read the whole file at its exact version.
How to install
mdr add univers42/claude-deal-with-the-devil/browser-testing@sha256:990519289b6269cdThe line at the top of this page pins the label git:20260930.00e2d41, 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_ul7mnsyx5433m4fs)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 20, 2026 and Sep 30, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260930.00e2d41 latest | 2026-09-30 | 00e2d41 | 3,733 B | A | view · diff |
| git:20260930.a77cb5e | 2026-09-30 | a77cb5e | 3,676 B | A | view · diff |
| git:20260930.445fa69 | 2026-09-30 | 445fa69 | 3,635 B | A | view · diff |
| git:20260926.44d1451 | 2026-09-26 | 44d1451 | 3,646 B | A | view · diff |
| git:20260920.16937ef | 2026-09-20 | 16937ef | 3,642 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3733 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
- pass: No link to a raw IP address
- pass: No script tag
Source
univers42/claude-deal-with-the-devil · 4 stars · license none declared · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ul7mnsyx5433m4fs GET https://markdownregistry.com/api/v1/resolve?ref=univers42/claude-deal-with-the-devil/browser-testing GET https://markdownregistry.com/api/v1/blob/990519289b6269cdb7eb43cd88bb5e75cfdc60f6aac56d5c2ed5f2ea30faca02
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.
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