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browser-testing-with-devtools skillB

This file is byte-identical to the first copy the registry indexed, one of 6 copies on public GitHub. Same content hash, same audit grade.

browser-testing-with-devtools is agent-read markdown (skill) from nota-america/forgecat-agent-profiles: 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..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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

Latest version
mdr add nota-america/forgecat-agent-profiles/browser-testing-with-devtools@git:20260916.3a6b22e
Exact content
mdr add nota-america/forgecat-agent-profiles/browser-testing-with-devtools@sha256:4e3aacd6a380cd25

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

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Versions

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Audit of the latest version

B  16 of 17 checks passed. Deterministic, no model, same answer every run.
  • 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 (14539 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

Source

GitHub

nota-america/forgecat-agent-profiles · 85 stars · license Apache-2.0 · pushed 2026-09-23 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_esyrlsqfz6xejptk
GET https://markdownregistry.com/api/v1/resolve?ref=nota-america/forgecat-agent-profiles/browser-testing-with-devtools
GET https://markdownregistry.com/api/v1/blob/4e3aacd6a380cd25bc6c2d67fdd1c926a9b22535b8a62109ecd33cefd909e3d9

Your agent 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.

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