Cursor built-in browser

Cursor ships with a managed Chromium window the agent can drive via a built-in MCP server — it can navigate, take accessibility-tree snapshots, click refs, fill forms, run JS, inspect console and network, and take screenshots. Under the hood it's Playwright in a persistent profile, so logins survive across turns and you can hand off between human and agent mid-session.

Good for: verifying a local dev server actually renders, clicking through a flow while building it, testing a deployed change without leaving the editor. Weaker than standalone Playwright MCP when you need custom launch flags (e.g. --user-data-dir pointing at a specific profile) or long-lived sessions outside Cursor. Mental model: Chrome DevTools that the agent can operate.