Borrowing it
Nothing to install: this file belongs to georgeLochner/playwright-mcp-mod. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/georgeLochner/playwright-mcp-mod/main/CLAUDE.mdgit clone --depth 1 https://github.com/georgeLochner/playwright-mcp-modWrote 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.
[](https://agentmods.dev/instructions/georgelochner/playwright-mcp-mod/claude-md)<a href="https://agentmods.dev/instructions/georgelochner/playwright-mcp-mod/claude-md"><img src="https://agentmods.dev/badge/instructions/georgelochner/playwright-mcp-mod/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.
<a href="https://agentmods.dev/instructions/georgelochner/playwright-mcp-mod/claude-md"><img src="https://agentmods.dev/badge/instructions/georgelochner/playwright-mcp-mod/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00641 | $0.00641 |
| Opus 5.5 | $0.00256 | $0.00256 |
| Sonnet 5.5 | $0.00128 | $0.00128 |
| Haiku 4.5 | $0.00064 | $0.00064 |
Grade A, and why
playwright-mcp-mod 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.
How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
Playwright MCP is a Model Context Protocol (MCP) server that provides browser automation capabilities using Playwright. It enables LLMs to interact with web pages through structured accessibility snapshots rather than screenshots.
Build and Test Commands
# Run all tests (Chrome by default)
npm test
# Run tests for specific browsers
npm run ctest # Chrome
npm run ftest # Firefox
npm run wtest # WebKit
# Run a single test file
npx playwright test tests/core.spec.ts
# Run a single test by name
npx playwright test -g "browser_navigate"
# Run tests in Docker
npm run dtest
# Lint/update README (generates tool docs from code)
npm run lint
# Copy config.d.ts from upstream Playwright repo
npm run copy-config
# Roll (copy-config + lint)
npm run roll
Architecture
This is a thin wrapper package around the MCP implementation in the main Playwright repository. The core MCP logic lives in playwright/lib/mcp/ - this package just re-exports it.
Entry points:
cli.js- CLI entry point that patches MCP Server before loading Playwright modules. Adds usage tracking (writes tousage.txt) and tool filtering via config file. Usesplaywright-core/lib/utilsBundlefor command parsing andplaywright/lib/mcp/programfor MCP commands.index.js- Library entry point, exportscreateConnectionfromplaywright/lib/mcp/indexconfig.d.ts- TypeScript configuration types (copied from main Playwright repo vianpm run copy-config)
Test structure:
tests/fixtures.ts- Custom Playwright test fixtures providing MCP client setup via@modelcontextprotocol/sdktests/testserver/- HTTP/HTTPS test server for testing browser automation- Tests use
StdioClientTransportto communicate with the MCP server spawned as a subprocess
Browser extension:
extension/- Chrome extension ("Playwright MCP Bridge") that allows connecting to existing browser tabs- Has its own build system (Vite), tests, and tsconfig
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 · 69 lines · 641 tokens per session scan A 57b5e09f2a60
playwright-mcp-mod CLAUDE.md is an instructions file published in the GitHub repository georgeLochner/playwright-mcp-mod (0 stars, last pushed 9mo ago), licensed Apache-2.0. It adds 641 tokens to every session, about $0.0026 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 2026-09-01.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.