What is chrome-devtools?

A guide to controlling Chrome with Puppeteer, a tool that lets scripts operate a web browser, while also debugging pages and measuring performance.

Use it for browser automation, form filling, web scraping, screenshots, JavaScript debugging, network inspection, and performance analysis.

It removes repetitive manual browser work and helps investigate page behavior, network traffic, screenshots, and slow JavaScript.

chrome-devtools — Skill for Claude Code and Codex by VoDaiLocz

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/VoDaiLocz/kilo-kit-mcp

agentmods

npx agentmods add skills/vodailocz/kilo-kit-mcp/chrome-devtools

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vodailocz/kilo-kit-mcp/chrome-devtools/github.svg)](https://agentmods.dev/skills/vodailocz/kilo-kit-mcp/chrome-devtools)

Your own site

<a href="https://agentmods.dev/skills/vodailocz/kilo-kit-mcp/chrome-devtools"><img src="https://agentmods.dev/badge/skills/vodailocz/kilo-kit-mcp/chrome-devtools/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/vodailocz/kilo-kit-mcp/chrome-devtools"><img src="https://agentmods.dev/badge/skills/vodailocz/kilo-kit-mcp/chrome-devtools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,012 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00045	$0.03012
Opus 5.5	$0.00018	$0.01205
Sonnet 5.5	$0.00009	$0.00602
Haiku 4.5	$0.00005	$0.00301

Measured 1mo ago against content hash 1df9c6666632, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

chrome-devtools scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

The scan reads SKILL.md. This mod also ships 16 executable files (scripts/__tests__/selector.test.js, scripts/click.js, scripts/close-persistent.js, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo apt-get install imagemagick

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

chrome-devtools — 88% identical, 50 lines differ
chrome-devtools — 83% identical, 115 lines differ

skills/operations/chrome-devtools/SKILL.md · 393 lines

How it starts

The opening of the file, as written. The whole thing — 393 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Chrome DevTools Agent Skill

Browser automation via executable Puppeteer scripts. All scripts output JSON for easy parsing.

Quick Start

CRITICAL: Always check pwd before running scripts.

Installation

Step 1: Install System Dependencies (Linux/WSL only)

On Linux/WSL, Chrome requires system libraries. Install them first:

pwd  # Should show current working directory
cd .claude/skills/chrome-devtools/scripts
./install-deps.sh  # Auto-detects OS and installs required libs

Supports: Ubuntu, Debian, Fedora, RHEL, CentOS, Arch, Manjaro

macOS/Windows: Skip this step (dependencies bundled with Chrome)

Step 2: Install Node Dependencies

npm install  # Installs puppeteer, debug, yargs

Step 3: Install ImageMagick (Optional, Recommended)

ImageMagick enables automatic screenshot compression to keep files under 5MB:

macOS:

brew install imagemagick

Ubuntu/Debian/WSL:

sudo apt-get install imagemagick

Verify:

magick -version  # or: convert -version

Without ImageMagick, screenshots >5MB will not be compressed (may fail to load in Gemini/Claude).

Test

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

Available Scripts

All scripts are in .claude/skills/chrome-devtools/scripts/

CRITICAL: Always check pwd before running scripts.

Script Usage

./scripts/README.md

Core Automation

navigate.js - Navigate to URLs
screenshot.js - Capture screenshots (full page or element)
click.js - Click elements
fill.js - Fill form fields
evaluate.js - Execute JavaScript in page context

Analysis & Monitoring

snapshot.js - Extract interactive elements with metadata
console.js - Monitor console messages/errors
network.js - Track HTTP requests/responses
performance.js - Measure Core Web Vitals + record traces

Usage Patterns

Single Command

pwd  # Should show current working directory
cd .claude/skills/chrome-devtools/scripts
node screenshot.js --url https://example.com --output ./docs/screenshots/page.png

Important: Always save screenshots to ./docs/screenshots directory.

Read the full file on GitHub · 393 lines

Files

What ships with it

25 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 393 lines · 45 tokens per session scan B 1df9c6666632

Subscribe to this mod's changes

chrome-devtools is a skill published in the GitHub repository VoDaiLocz/kilo-kit-mcp (28 stars, last pushed 5d ago), licensed Apache-2.0. It adds 45 tokens to every session and 3,012 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Browser automation Claude Code Debugging agent-skills agentic-workflow ai-agent ai-workflows skill-md

chrome-devtools