browser-testing-with-devtools SKILL.md skillB
browser-testing-with-devtools from addyosmani/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add addyosmani/agent-skills/browser-testing-with-devtools@git:20261029.57bfe5dPins git:20261029.57bfe5d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- addyosmani/agent-skills
- Path
skills/browser-testing-with-devtools/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261029.57bfe5d, committed Oct 29, 2026
- First version recorded
- Mar 28, 2026
- Size
- 14,640 bytes
- Repository stars
- 112,362
- License
- MIT
Tests in real browsers via Chrome DevTools MCP. Use when building or debugging anything that runs in a browser. Use when you need to inspect the DOM, capture console errors, analyze network requests, profile performance, or verify visual output with real runtime data. Requires the chrome-devtools MCP server to be configured.
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 with DevTools
## Overview
Use Chrome DevTools MCP to give your agent eyes into the browser. This bridges the gap between static code analysis and live browser execution — the agent can see what the user sees, inspect the DOM, read console logs, analyze network requests, and capture performance data. Instead of guessing what's happening at runtime, verify it.
## When to Use
- Building or modifying anything that renders in a browser
- Debugging UI issues (layout, styling, interaction)
- Diagnosing console errors or warnings
- Analyzing network requests and API responses
- Profiling performance (Core Web Vitals, paint timing, layout shifts)
- Verifying that a fix actually works in the browser
- Automated UI testing through the agent
**When NOT to use:** Backend-only changes, CLI tools, or code that doesn't run in a browser.
## Setting Up Chrome DevTools MCP
### Installation
Add the following to your project's `.mcp.json` or Claude Code settings:
```json
{
"mcpServers": {
"chrome-devtools": {
"command": "npx",
"args": ["-y", "chrome-devtools-mcp@latest", "--isolated"]
}
}
}
```
…Read the whole file at its exact version.
How to install
mdr add addyosmani/agent-skills/browser-testing-with-devtools@sha256:e28dd45416e6df93The line at the top of this page pins the label git:20261029.57bfe5d, 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_xxlswbqwgd7iuwno)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Mar 28, 2026 and Oct 29, 2026, about one every 43 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261029.57bfe5d latest | 2026-10-29 | 57bfe5d | 14,640 B | B | view · diff |
| git:20260611.e8c9b46 | 2026-06-11 | e8c9b46 | 14,539 B | B | view · diff |
| git:20260609.fd6554a | 2026-06-09 | fd6554a | 12,690 B | B | view · diff |
| git:20260512.4d277aa | 2026-05-12 | 4d277aa | 12,559 B | B | view · diff |
| git:20260331.fea75b1 | 2026-03-31 | fea75b1 | 12,501 B | B | view · diff |
| git:20260328.c1e7c25 | 2026-03-28 | c1e7c25 | 12,477 B | B | view |
Audit of the latest version
- fail: No prompt-injection phrasing (matched: Ignore previous instructions)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14640 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 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
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
addyosmani/agent-skills · 112,362 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xxlswbqwgd7iuwno GET https://markdownregistry.com/api/v1/resolve?ref=addyosmani/agent-skills/browser-testing-with-devtools GET https://markdownregistry.com/api/v1/blob/e28dd45416e6df93f0db6fffeb3aa2477a0e48a22f8e05fd5bb1892484115bb6
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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