agent-browser

Overview

agent-browser is an open-source browser automation CLI from Vercel Labs, built for LLM interaction with a snapshot + refs system: instead of a full DOM, snapshot returns an accessibility tree of just the interactive elements (buttons, inputs, links) with semantic labels, each tagged with a stable @e1-style ref. Full DOM dumps run 5000+ nodes / 200KB of context; an accessibility-tree snapshot is 50-100 elements / ~10KB, roughly a 93% reduction. Refs also survive re-renders, so they don't need re-deriving after every DOM tweak the way CSS selectors do.

See When to Use vs Playwright for when this CLI beats DOM-based tools.

Installation

# macOS (preferred — managed by Homebrew)
brew install agent-browser

# Linux / fallback
npm install -g agent-browser

# Install browser binaries after either method
agent-browser install