Playwright Development Guide

Table of Contents

• Adding and Modifying APIs — define API docs, implement client/server, add tests
• MCP Tools and CLI Commands — add MCP tools, CLI commands, config options
• Vendoring Dependencies — bundle third-party npm packages into playwright-core or playwright

Build

• Assume watch is running and everything is up to date.
• If not, run

  npm run build

  .

Lint

• Run

  npm run flint

  to lint everything before commit.