What is browser-mcp CLAUDE.md?

Project-specific instructions for browser-mcp, a server that automates web browsers with Playwright. Playwright is a tool for controlling browsers to browse, click, take screenshots, and extract information.

Use them when developing or maintaining browser-mcp, including its command-line entry point, structured responses, and local or HTTP operation.

They give developers the project's entry points, response format, transport options, and key files so changes follow its established conventions.

How The-Syntax-Slayer/browser-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to The-Syntax-Slayer/browser-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/The-Syntax-Slayer/browser-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/The-Syntax-Slayer/browser-mcp

Made for: Claude Code.

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/instructions/the-syntax-slayer/browser-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/the-syntax-slayer/browser-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/the-syntax-slayer/browser-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/the-syntax-slayer/browser-mcp/claude-md/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/instructions/the-syntax-slayer/browser-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/the-syntax-slayer/browser-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 193 This file is loaded in full into every session.

When invoked 193 The same file — it is already loaded in full.

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	$0.00193	$0.00193
Opus 5.5	$0.00077	$0.00077
Sonnet 5.5	$0.00039	$0.00039
Haiku 4.5	$0.00019	$0.00019

Measured 2mo ago against content hash 5a8e20a0ff7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

browser-mcp CLAUDE.md 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 2mo ago.

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.

CLAUDE.md · 19 lines

What it actually says

browser-mcp — Claude Code Guide

Overview

FastMCP 3.2 server for Playwright browser automation — browse, click, screenshot, extract

Entry Points

uv run browser-mcp → browser_mcp.__main__:main

Standards

FastMCP 3.2+ portmanteau tool pattern — tools use operation enum param
Responses: structured dicts with success, message, domain-specific fields
Dual transport: stdio (Claude Desktop) + HTTP (MCP_TRANSPORT=http)
See mcp-central-docs for fleet-wide coding standards

Key Files

README.md — full documentation
pyproject.toml — build config and entry points
AGENTS.md — OpenAI Codex agent context (if present)

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.

2mo ago First seen · 19 lines · 193 tokens per session scan A 5a8e20a0ff7e

Subscribe to this mod's changes

browser-mcp CLAUDE.md is an instructions file published in the GitHub repository The-Syntax-Slayer/browser-mcp (1 stars, last pushed 4mo ago), licensed MIT. It adds 193 tokens to every session, about $0.0008 per session on Opus 5.5. 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.

browser-automation mcp mcp-server playwright react-dashboard

browser-mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
browser-mcp CLAUDE.mdThe-Syntax-Slayer/browser-mcp	Instructions file	1	4mo ago	MIT	A	193	Claude Code
qmax-mcp copilot-instructions.mdQuality-Max/qmax-mcp	Instructions file	4	4d ago	MIT	A	451	GitHub Copilot
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot

browser-mcp: Instructions file for Claude Code