Chrome Devtools

What it does

When your agent uses it

• Automating browsers
• Taking screenshots
• Analyzing performance
• Monitoring network traffic

Example prompts

• “/chrome-devtools”

Requirements

• Node.js
• A Bash shell

Workflow steps

2 steps, taken from the step headings in SKILL.md.

1. 1Install System Dependencies (Linux/WSL only)
2. 2Install Node Dependencies

What it can do on your machine

Read from SKILL.md and the folder at commit c6c0686. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 14 files in scripts/ (JavaScript and Shell, from the files we listed), which the agent can run.

  Shell commands in SKILL.md call:

  • node
  • npm
  • jq
  • apt-get
  • npx

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • pptr.dev
  • chromedevtools.github.io

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Chrome Devtools loads about 1.6k tokens when it runs, and up to ~16k if it reads all its reference files. Until then it costs about 64 tokens; SKILL.md has 396 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~64

When it runs · the whole SKILL.md, loaded when a task matches

~1.6k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~16k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteRuns commands with sudoSKILL.md:167

  - Manual install: `sudo apt-get install -y libnss3 libnspr4 libasound2t64 libatk1.0-0 libatk-bridge2.0-0 libcups2 libdrm

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from einverne/dotfiles at commit c6c0686, republished under its Apache-2.0 licence (© einverne). 396 words, ~1,562 tokens.

name

chrome-devtools

description

Browser automation, debugging, and performance analysis using Puppeteer CLI scripts. Use for automating browsers, taking screenshots, analyzing performance, monitoring network traffic, web scraping, form automation, and JavaScript debugging.

license

Apache-2.0

cd .claude/skills/chrome-devtools/scripts
./install-deps.sh  # Auto-detects OS and installs required libs

npm install  # Installs puppeteer, debug, yargs

node navigate.js --url https://example.com
# Output: {"success": true, "url": "https://example.com", "title": "Example Domain"}

cd .claude/skills/chrome-devtools/scripts
node screenshot.js --url https://example.com --output ./docs/screenshots/page.png

# Keep browser open with --close false
node navigate.js --url https://example.com/login --close false
node fill.js --selector "#email" --value "user@example.com" --close false
node fill.js --selector "#password" --value "secret" --close false
node click.js --selector "button[type=submit]"

# Extract specific fields with jq
node performance.js --url https://example.com | jq '.vitals.LCP'

# Save to file
node network.js --url https://example.com --output /tmp/requests.json

node evaluate.js --url https://example.com --script "
  Array.from(document.querySelectorAll('.item')).map(el => ({
    title: el.querySelector('h2')?.textContent,
    link: el.querySelector('a')?.href
  }))
" | jq '.result'

PERF=$(node performance.js --url https://example.com)
LCP=$(echo $PERF | jq '.vitals.LCP')
if (( $(echo "$LCP < 2500" | bc -l) )); then
  echo "✓ LCP passed: ${LCP}ms"
else
  echo "✗ LCP failed: ${LCP}ms"
fi

node fill.js --url https://example.com --selector "#search" --value "query" --close false
node click.js --selector "button[type=submit]"

node console.js --url https://example.com --types error,warn --duration 5000 | jq '.messageCount'

{
  "success": true,
  "url": "https://example.com",
  ... // script-specific data
}

{
  "success": false,
  "error": "Error message"
}

node snapshot.js --url https://example.com | jq '.elements[] | {tagName, text, selector}'

import { getBrowser, getPage, closeBrowser, outputJSON } from './lib/browser.js';
// Your automation logic

const client = await page.createCDPSession();
await client.send('Emulation.setCPUThrottlingRate', { rate: 4 });

© einverne, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 19 other files (scripts, references) in claude/skills/chrome-devtools of einverne/dotfiles.

• SKILL.md
• references/cdp-domains.md
• references/performance-guide.md
• references/puppeteer-reference.md
• scripts/.gitignore
• scripts/README.md
• scripts/click.js
• scripts/console.js
• scripts/evaluate.js
• scripts/fill.js
• scripts/install-deps.sh
• scripts/install.sh
• scripts/lib/browser.js
• scripts/navigate.js
• scripts/network.js
• scripts/package-lock.json
• scripts/package.json
• scripts/performance.js
• … and 2 more

Open the folder on GitHubat commit c6c0686

Used in 1 other repository

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in einverne/dotfiles, which our catalogue first saw on October 7, 2026.

• Microck/ordinary-claude-skillsskills_all/chrome-devtoolsskills_categorized/security/chrome-devtools