v1.1.1 — React DevTools integration

Fast headless browser for AI agents

The CLI that lets AI agents browse the web. 2.4x fewer tokens than alternatives. ~100ms per command.

$npx @ulpi/browse

terminal

2.4x

fewer tokens

vs browser-use and @playwright/mcp

~100ms

ms per command

After initial startup

121

commands

Navigation, interaction, extraction, and more

MIT

MIT License

Free and open source

Built for AI agents

Token efficient

Selective snapshot loading means agents only request accessibility trees when needed — not on every action.

Blazing fast

Persistent daemon architecture. First command starts the server, subsequent commands execute in ~100ms.

@ref system

No CSS selectors needed. Snapshot assigns numbered refs (@e1, @e2) to elements. Click @e3, fill @e5.

Works everywhere

Claude Code, Cursor, Cline, Windsurf — any AI agent that can run bash commands.

Model Context Protocol

Native MCP integration

Run browse as an MCP server. Cursor, Claude Desktop, and Windsurf call browse tools directly — no shell commands, no wrappers. Same 121 commands, same ~100ms speed.

CursorClaude DesktopWindsurf

View MCP setup guide

.cursor/mcp.json

{
  "mcpServers": {
    "browse": {
      "command": "browse",
      "args": ["--mcp"]
    }
  }
}

Local or cloud. Your choice.

Switch browser engines on the fly or offload to cloud providers. Same commands work everywhere.

Local

Playwright (default)

Full-featured Chromium with auto-install. All 121 commands, most tested and stable. The default for local development.

Local

Rebrowser (stealth)

Patched Chromium that evades bot detection. Passes Cloudflare, DataDome, and more. Same API, drop-in replacement.

Local

LightPanda (lightweight)

Zig-based browser engine. 10x faster page loads, ~10MB memory. Ideal for static content extraction and simple scraping.

Cloud

Browserbase

Managed cloud Chromium for CI/CD and serverless. Spin up sessions on demand — no local browser needed.

Cloud

Browserless

Connect to Browserless for scalable headless browsing. API keys encrypted at rest, never visible to agents.

Explore runtimes & providers

Terminal

$ browse react-tree
# App > Layout > Dashboard
#   <UserProfile name="Alice">
#   <DataTable rows=142 loading=false>

$ browse react-props @e12
# { rows: 142, onSort: fn, filter: "active" }

$ browse react-state @e12
# { sortCol: "date", page: 3 }

React DevTools

Your agent can debug React — on the fly

Inspect component trees, read props and state, find Suspense boundaries, and measure render timing. Your AI agent can now diagnose UI bugs without you lifting a finger.