What is browser-tools?

A browser-automation skill for controlling Chrome through its debugging connection.

It helps test websites, navigate pages, run page scripts, select elements, scrape information, and capture screenshots.

It gives an agent a way to inspect and interact with web pages when ordinary code inspection is not enough.

browser-tools — Skill for Claude Code by lttr

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add lttr/claude-marketplace --skill browser-tools

Clone the repo

git clone --depth 1 https://github.com/lttr/claude-marketplace

Made for: Claude Code.

Or install browser-tools, the plugin that ships this one along with the rest of its 1 skill, 1 command.

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/lttr/claude-marketplace/browser-tools/github.svg)](https://agentmods.dev/skills/lttr/claude-marketplace/browser-tools)

Your own site

<a href="https://agentmods.dev/skills/lttr/claude-marketplace/browser-tools"><img src="https://agentmods.dev/badge/skills/lttr/claude-marketplace/browser-tools/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/lttr/claude-marketplace/browser-tools"><img src="https://agentmods.dev/badge/skills/lttr/claude-marketplace/browser-tools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,219 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. 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	$0.00060	$0.01219
Opus 5	$0.00030	$0.00609
Sonnet 5	$0.00012	$0.00244
Haiku 4.5	$0.00006	$0.00122

Measured 10d ago against content hash 38162166b1bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

browser-tools scanned grade A with 0 findings 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 10d ago.

The scan reads SKILL.md. This mod also ships 7 executable files (scripts/browser-console.js, scripts/browser-cookies.js, scripts/browser-eval.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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

_archived/browser-tools/skills/browser-tools/SKILL.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Browser Tools

Chrome DevTools Protocol automation for agent-assisted web testing and interaction. Uses Chrome running on :9222 with remote debugging.

Prerequisites

Run /browser-tools:setup once after plugin installation - This installs dependencies and creates global symlinks for all browser scripts.

Usage

When user asks to test, verify, or interact with web pages using browser tools:

Start Chrome - Launch with debugging enabled
Navigate & interact - Use scripts to navigate, evaluate JS, take screenshots
Return results - Show output/screenshots to user

IMPORTANT: Use command names directly (e.g., browser-start), NOT full paths (e.g., ~/bin/browser-start). Commands are in PATH after setup.

Available Scripts

All scripts located in ${CLAUDE_SKILL_DIR}/scripts/:

browser-start

By default use the persistent profile at /tmp/chrome-profile-browser-tools.

browser-start --profile    # Persistent profile
browser-start              # Fresh profile

Launch Chrome with remote debugging on port 9222. Use --profile to maintain login state between sessions.

browser-nav

browser-nav https://example.com
browser-nav https://example.com --new

Navigate to URLs. Use --new to open in new tab instead of current tab.

browser-eval

browser-eval 'document.title'
browser-eval 'document.querySelectorAll("a").length'
browser-eval 'Array.from(document.querySelectorAll("h1")).map(h => h.textContent)'

Execute JavaScript in active tab. Runs in async context. Use for:

Extract data from pages
Inspect page state
Manipulate DOM
Test page functionality

browser-screenshot

browser-screenshot

Capture current viewport, returns temp file path. Use Read tool to show screenshot to user.

browser-pick

browser-pick                      # Uses default message "Select element(s)"
browser-pick "Select the submit button"

Interactive element picker - Launches UI overlay for user to click and select elements. Returns element details (tag, id, class, text, html, parent hierarchy). Message parameter is optional.

Read the full file on GitHub · 174 lines

Files

What ships with it

8 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.

10d ago First seen · 174 lines · 60 tokens per session scan A 38162166b1bd

Subscribe to this mod's changes

browser-tools is a skill published in the GitHub repository lttr/claude-marketplace (2 stars, last pushed 3d ago), licensed MIT. It adds 60 tokens to every session and 1,219 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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