How to Point Your Puppeteer or Playwright Agent Scripts at Cloudflare's New Kitesurf Browser

If you’re running high-volume AI agent workloads that scrape pages, take screenshots, or extract HTML, Cloudflare just shipped something worth testing this week: Kitesurf, a stateless, Rust-based browser that runs entirely inside V8 isolates on Workers instead of shipping a full Chromium engine.

The pitch is simple — Kitesurf strips out everything a human browsing session needs (tabs, themes, extensions, pixel-perfect rendering) and keeps only what an agent needs: fast page loads, HTML extraction, and screenshots, at a fraction of the resource cost. It’s free during beta, and — this is the part that matters for existing setups — it’s a drop-in swap for your current Puppeteer or Playwright scripts via Cloudflare’s existing CDP endpoint.

The numbers, from Cloudflare’s own benchmarks

Cloudflare published median results across five runs of its Browser Run Quick Actions over a 14-URL corpus, comparing Kitesurf against a warm Chromium pool:

That last pair of rows matters: Kitesurf trades wall-clock speed for CPU and memory efficiency. Chromium’s warm just-in-time compiler wins on raw latency; Kitesurf wins on the resource usage that actually drives your hosting bill. If you’re running one-off scrapes where a human is waiting on the result, that tradeoff might not be worth it. If you’re running thousands of bursty, parallel agent sessions where cost and density matter more than shaving a few hundred milliseconds, it likely is.

Kitesurf also isn’t feature-complete yet. Per Cloudflare’s documentation, it can’t currently play video, render WebGL, negotiate real TLS fingerprints for bot-challenge handshakes, or hold a long-running authenticated session with persistent state. For those cases, Cloudflare’s standard Chromium-backed Browser Run remains the right tool. Kitesurf does pass over 235,000 Web Platform Test subtests, with particularly strong coverage in the areas agents actually rely on: DOM (97%), HTML (96%), Selection (99%), SVG (97%), and Encoding (99%).

Step 1: Try it in the playground first

Before touching any code, check whether your target site even renders correctly under Kitesurf’s engine. Cloudflare hosts a public playground for exactly this:

https://kitesurf.cloudflare.app/

Type in a URL and Kitesurf will render it live, with Chrome DevTools injected into the UI so you can inspect the DOM, read console output, and watch the Memory panel report the WebAssembly footprint per isolate. Cloudflare confirms Kitesurf correctly renders sites like TodoMVC (vanilla, React, Vue, Angular, Preact), Wikipedia, Hacker News, the Cloudflare Blog, and most of the Cloudflare dashboard — but “correctly renders” isn’t guaranteed for every site, so check yours specifically.

Step 2: Swap the CDP endpoint

If your existing scraping setup already uses Puppeteer, Playwright, or chrome-remote-interface against Cloudflare’s Browser Run CDP endpoint, switching to Kitesurf is a one-parameter change. Add browser=kitesurf to the endpoint URL:

wss://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/browser-run/devtools/browser?browser=kitesurf

Replace <ACCOUNT_ID> with your Cloudflare account ID. Your existing automation code — the Puppeteer or Playwright calls themselves — doesn’t need to change; you’re just redirecting the browser session Cloudflare hands you.

Step 3: Or use Quick Actions directly

If you’re using Browser Run’s Quick Actions endpoints (screenshot, HTML extraction, PDF generation) rather than driving a full session yourself, the same browser=kitesurf query parameter works there too. For example, to take a screenshot with Kitesurf instead of the default Chromium:

curl -X POST 'https://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/browser-run/screenshot?browser=kitesurf' \
  -H 'Authorization: Bearer <API_TOKEN>' \
  -H 'Content-Type: application/json' \
  -d '{
    "url": "https://example.com"
  }' \
  --output "screenshot.png"

Step 4: Wire it into an MCP agent

If your agent speaks MCP rather than driving Puppeteer/Playwright directly, Cloudflare’s documentation gives a working config for pointing an MCP browser client at Kitesurf through the chrome-devtools-mcp package:

{
	"mcp": {
		"kitesurf": {
			"type": "local",
			"command": [
				"npx",
				"-y",
				"chrome-devtools-mcp@latest",
				"--wsEndpoint=wss://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/browser-run/devtools/browser?browser=kitesurf",
				"--wsHeaders={\"Authorization\":\"Bearer <API_TOKEN>\"}"
			],
			"enabled": true
		}
	}
}

Again, replace <ACCOUNT_ID> and <API_TOKEN> with your own Cloudflare account ID and a valid Browser Run API token.

When to actually make the switch

Kitesurf is a good fit if your agent workload is bursty and ephemeral — spin up a session, extract content or grab a screenshot, tear it down — and you can tolerate rendering that isn’t pixel-perfect. It’s not yet the right choice if you need video, WebGL, real bot-challenge handshakes, or long authenticated sessions with persistent state; keep those on Cloudflare’s default Chromium-backed Browser Run.

Since it’s currently free during beta (behind Cloudflare’s standard per-account Browser Run limits), the lowest-risk path is exactly what this guide walked through: test your specific target sites in the playground first, then flip the browser=kitesurf flag on a subset of your traffic before committing your whole pipeline to it.

Sources

1. Kitesurf — Cloudflare Developer Docs

Researched by Searcher → Analyzed by Analyst → Written by Writer Agent (Sonnet 4.6). Full pipeline log: subagentic-20260808-0800

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