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faster-chrome-devtools-skill

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Updated 10-16 00:20

About this skill

faster-chrome-devtools-skill

Skill by ara.so — Devtools Skills collection.

An agent skill and CLI for controlling Chrome directly through the Chrome DevTools Protocol (CDP). Provides fast accessibility snapshots, element interaction, navigation with explicit timeouts, screenshot capture, and console/network inspection without heavy dependencies like Puppeteer or Playwright.

Installation

Install globally for all agents:

npx skills add zeke/faster-chrome-devtools-skill --global --all --yes

Requires Node.js installed. No additional dependencies needed.

Core Concepts

The tool uses a lightweight background daemon that holds the CDP WebSocket connection open for 20 minutes, avoiding repeated Chrome access prompts. Connection details are stored in an owner-readable temp file with a random auth token.

Three connection modes:

  1. Logged-in Chrome: Connect to your existing Chrome instance (requires enabling remote debugging at chrome://inspect/#remote-debugging)
  2. Anonymous Chromium: Launch a fresh temporary instance with --launch
  3. Remote/Cloud: Connect to Cloudflare Browser Run or other remote endpoints

CLI Commands

All commands use node scripts/cdp.mjs <command> format.

Navigation & Page Control

# Navigate to URL with explicit timeout
node scripts/cdp.mjs navigate https://example.com --timeout 10000

# Navigate and wait for specific text
node scripts/cdp.mjs navigate https://github.com --wait-text "Pull requests"

# Navigate and wait for selector
node scripts/cdp.mjs navigate https://example.com --wait-selector "#main-content"

# List all open tabs
node scripts/cdp.mjs list-tabs

# Open new tab
node scripts/cdp.mjs open-tab https://news.ycombinator.com

# Switch to existing tab by ID
node scripts/cdp.mjs switch-tab <tab-id>

# Close current tab
node scripts/cdp.mjs close-tab

Reading Page Content

# Get compact accessibility snapshot with stable element references
node scripts/cdp.mjs snapshot

# Get full page text content
node scripts/cdp.mjs get-text

# Capture screenshot (JPEG by default for compression)
node scripts/cdp.mjs screenshot --path screenshot.jpg

# Capture WebP screenshot
node scripts/cdp.mjs screenshot --path screenshot.webp --format webp

# Capture PNG screenshot
node scripts/cdp.mjs screenshot --path screenshot.png --format png

# Full page screenshot
node scripts/cdp.mjs screenshot --path full.jpg --full-page

Element Interaction

# Click by accessibility reference (from snapshot)
node scripts/cdp.mjs click --ref "button-login-123"

# Click by CSS selector
node scripts/cdp.mjs click --selector "button.submit"

# Fill input by accessibility reference
node scripts/cdp.mjs fill --ref "input-email-456" --value "user@example.com"

# Fill input by CSS selector
node scripts/cdp.mjs fill --selector "#email" --value "user@example.com"

# Type text (works in cross-origin frames via native CDP)
node scripts/cdp.mjs type "Hello world" --delay 50

Wait Operations

# Wait for text to appear (default 30s timeout)
node scripts/cdp.mjs wait-text "Success" --timeout 15000

# Wait for selector to exist
node scripts/cdp.mjs wait-selector ".results-loaded"

# Wait for specific duration
node scripts/cdp.mjs wait --duration 2000

Debugging & Inspection

# Get console messages
node scripts/cdp.mjs get-console

# Get failed network requests
node scripts/cdp.mjs get-failed-loads

# Evaluate JavaScript
node scripts/cdp.mjs eval "document.title"

# Execute multi-line JavaScript
node scripts/cdp.mjs eval "
const links = Array.from(document.querySelectorAll('a'));
return links.map(a => ({ text: a.textContent, href: a.href }));
"

# Call raw CDP method
node scripts/cdp.mjs raw Runtime.evaluate '{"expression": "navigator.userAgent"}'

Connection Management

# Launch anonymous Chrome instance
node scripts/cdp.mjs snapshot --launch

# Connect to specific WebSocket endpoint
node scripts/cdp.mjs snapshot --ws-endpoint ws://localhost:9222/devtools/browser/xyz

# Connect to HTTP endpoint (auto-discovers WebSocket)
node scripts/cdp.mjs snapshot --http-endpoint http://localhost:9222

# Stop the daemon
node scripts/cdp.mjs stop

# Stop specific daemon by ID
node scripts/cdp.mjs stop --id <daemon-id>

# Stop all running daemons
node scripts/cdp.mjs stop --all

# Stop daemon for specific endpoint
node scripts/cdp.mjs stop --ws-endpoint ws://localhost:9222/devtools/browser/xyz

Configuration

Using Your Logged-in Chrome

  1. Open Chrome and navigate to chrome://inspect/#remote-debugging
  2. Check "Discover network targets"
  3. Click "Configure" and ensure localhost:9222 is listed
  4. Launch Chrome with remote debugging:
# macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --remote-debugging-port=9222

# Linux
google-chrome --remote-debugging-port=9222

# Windows
"C:\Program Files\Google\Chrome\Application\chrome.exe" --remote-debugging-port=9222

Cloudflare Browser Run Setup

Set these environment variables:

export CLOUDFLARE_ACCOUNT_ID="your-account-id"
export CLOUDFLARE_API_TOKEN="your-api-token"

Then use:

node scripts/cdp.mjs snapshot --http-endpoint https://browser.run.cloudflare.com

The CLI automatically adds the required authentication headers.

Common Patterns

Scrape Structured Data

// 1. Navigate and wait for content
// node scripts/cdp.mjs navigate https://news.ycombinator.com --wait-selector ".itemlist"

// 2. Get accessibility snapshot to find element references
// node scripts/cdp.mjs snapshot

// 3. Extract data with JavaScript
// node scripts/cdp.mjs eval "
const stories = Array.from(document.querySelectorAll('.athing')).slice(0, 5);
return stories.map(story => ({
  title: story.querySelector('.titleline > a')?.textContent,
  url: story.querySelector('.titleline > a')?.href
}));
// "

Login Flow

# Navigate to login page
node scripts/cdp.mjs navigate https://example.com/login --wait-selector "#username"

# Fill credentials
node scripts/cdp.mjs fill --selector "#username" --value "$USERNAME"
node scripts/cdp.mjs fill --selector "#password" --value "$PASSWORD"

# Submit form
node scripts/cdp.mjs click --selector "button[type=submit]"

# Wait for redirect
node scripts/cdp.mjs wait-text "Dashboard" --timeout 10000

# Take screenshot to verify
node scripts/cdp.mjs screenshot --path logged-in.jpg

Multi-tab Workflow

# List current tabs
node scripts/cdp.mjs list-tabs

# Open new tab
node scripts/cdp.mjs open-tab https://github.com

# Work in new tab
node scripts/cdp.mjs snapshot

# Switch back to first tab
node scripts/cdp.mjs switch-tab <first-tab-id>

# Close current tab when done
node scripts/cdp.mjs close-tab

Monitor Page for Changes

# Navigate to page
node scripts/cdp.mjs navigate https://example.com/status

# Take initial snapshot
node scripts/cdp.mjs snapshot > before.txt

# Wait some time
node scripts/cdp.mjs wait --duration 5000

# Take second snapshot
node scripts/cdp.mjs snapshot > after.txt

# Compare with diff tool
diff before.txt after.txt

Debugging Failed Loads

# Navigate to page
node scripts/cdp.mjs navigate https://example.com

# Check for failed network requests
node scripts/cdp.mjs get-failed-loads

# Check console errors
node scripts/cdp.mjs get-console

# Take screenshot for visual inspection
node scripts/cdp.mjs screenshot --path debug.jpg

Accessibility Snapshot Format

The snapshot command returns a compact tree with stable references:

{
  "role": "WebArea",
  "name": "Example Page",
  "ref": "page-1",
  "children": [
    {
      "role": "button",
      "name": "Submit",
      "ref": "button-submit-42",
      "focusable": true
    },
    {
      "role": "textbox",
      "name": "Email",
      "ref": "input-email-43",
      "focusable": true,
      "value": ""
    }
  ]
}

Use the ref values with --ref flags in click and fill commands for reliable element targeting.

Troubleshooting

"Connection refused" when connecting to Chrome

  • Ensure Chrome is running with --remote-debugging-port=9222
  • Check that no firewall is blocking localhost:9222
  • Verify chrome://inspect/#remote-debugging shows the debugging port

"Target closed" or connection drops

  • The daemon times out after 20 minutes of inactivity
  • Restart with any command that reconnects
  • Use node scripts/cdp.mjs stop to clean up stale daemons

Screenshots are empty or broken

  • Wait for page to fully load before capturing
  • Use --wait-selector or --wait-text with navigate
  • Try --full-page flag if content is below fold
  • Check console/failed loads for rendering errors

Elements not found by selector

  • Use snapshot first to get stable accessibility references
  • Prefer --ref over --selector for reliability
  • Use wait-selector before clicking/filling
  • Check that selector syntax is correct for the page's structure

Cloudflare Browser Run authentication fails

  • Verify CLOUDFLARE_ACCOUNT_ID and CLOUDFLARE_API_TOKEN are set
  • Check token has Browser Rendering permissions
  • Ensure endpoint URL is https://browser.run.cloudflare.com

Commands hang or timeout

  • Increase --timeout values for slow pages
  • Check network connectivity to target site
  • Use get-console and get-failed-loads to diagnose page errors
  • Try navigating to simpler test page first to verify connection