Explains how Chrome DevTools Protocol works under the hood and shows how to drive a browser via raw WebSocket messages, giving agent builders the low-level knowledge needed to debug or extend tools like Puppeteer, Playwright, and browser-use agents.
This explainer traces Chrome DevTools Protocol from its origins as WebKit's remote debugging plumbing to its role as the JSON-over-WebSocket interface that tools like Puppeteer, Playwright, and browser agents use to control Chromium.
It walks through launching Chrome with remote debugging enabled and writing a minimal WebSocket client that navigates a page and listens for lifecycle events via CDP domains like Page, Network, and Runtime.
