Playwright Development Guide

Table of Contents

• Library Architecture — client/server/dispatcher structure, protocol layer, DEPS rules
• 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.