Cloudflare launches Kitesurf, a browser built for AI agents
Cloudflare launches Kitesurf, a browser built for AI agents
Cloudflare 发布 Kitesurf：一款专为 AI 智能体打造的浏览器
Cloudflare is the latest company to join the race to build a new web browser. But instead of pitching a Chrome alternative to consumers, the internet infrastructure provider launched Kitesurf, a cloud-hosted browser designed specifically for AI agents. Cloudflare 是最新加入构建新型网络浏览器竞赛的公司。但这家互联网基础设施提供商并没有向消费者推销 Chrome 的替代品，而是推出了 Kitesurf——一款专门为 AI 智能体（AI agents）设计的云托管浏览器。
AI software is evolving from chatbots that answer questions to agents that can complete tasks on users’ behalf. Browsers are a critical part of this transition, as they’ll need to navigate the web and use websites, as humans do. AI 软件正在从回答问题的聊天机器人演变为能够代表用户完成任务的智能体。浏览器是这一转变的关键部分，因为它们需要像人类一样浏览网页并使用网站。
Unlike traditional web browsers built for humans, a browser built for AI agents doesn’t care about visual elements, like themes, tabs, or browser extensions, Cloudflare explained in its announcement. A browser designed for AI agents needs to manage context windows, performance, token costs, and scalability. It also faces a different threat model because an AI browser could be subject to vulnerabilities like prompt injection attacks and more, the company noted. Cloudflare 在公告中解释称，与为人类构建的传统网络浏览器不同，为 AI 智能体构建的浏览器并不关心主题、标签页或浏览器扩展等视觉元素。专为 AI 智能体设计的浏览器需要管理上下文窗口、性能、Token 成本和可扩展性。该公司还指出，它面临着不同的威胁模型，因为 AI 浏览器可能会受到提示词注入攻击等漏洞的影响。
With Kitesurf, AI developers will be able to build software that can navigate websites, fill out forms, and complete other browser-based tasks, without having to build their own browser software. Cloudflare says it decided to build Kitesurf just 12 weeks ago, and it runs entirely on top of the company’s serverless platform, called Workers. 有了 Kitesurf，AI 开发人员将能够构建能够浏览网站、填写表单并完成其他基于浏览器任务的软件，而无需自行开发浏览器软件。Cloudflare 表示，他们是在 12 周前才决定构建 Kitesurf 的，它完全运行在公司名为 Workers 的无服务器平台上。
Kitesurf is available for free while in beta in Browser Run, which lets developers programmatically control and interact with headless browser instances on Cloudflare’s network. For developers, Cloudflare’s pitch is that this enables AI agents to use the web more efficiently while using less computing power than Chromium, which keeps costs down. Kitesurf 目前在 Browser Run 中提供免费测试版，允许开发人员以编程方式控制 Cloudflare 网络上的无头浏览器实例并与之交互。对于开发人员，Cloudflare 的卖点在于，这使得 AI 智能体能够更高效地使用网络，同时比 Chromium 消耗更少的计算能力，从而降低了成本。
“Kitesurf is significantly more efficient in CPU and memory consumption than Chromium for common agentic tasks like screenshots and HTML extraction,” according to the company. 该公司表示：“对于截图和 HTML 提取等常见的智能体任务，Kitesurf 在 CPU 和内存消耗方面比 Chromium 高效得多。”
The browser itself was built from other technologies, including a modular rendering engine from Blitz; Firefox’s CSS parser, Stylo; and Boa JS, a Rust ECMAScript engine. Everything else runs inside Cloudflare Workers. 该浏览器本身由其他技术构建而成，包括来自 Blitz 的模块化渲染引擎、Firefox 的 CSS 解析器 Stylo，以及 Rust ECMAScript 引擎 Boa JS。其余所有组件均在 Cloudflare Workers 内部运行。
Although still new, Cloudflare says Kitesurf already passes around 215,000+ web platform tests, and it’s adding hundreds more, passing tests every week. Cloudflare also credited the open source Rust headless engine, Obscura, for inspiring it to develop Kitesurf, noting that the first proof of concept was a port of Obscura to Workers. 尽管还很新，但 Cloudflare 表示 Kitesurf 已经通过了约 215,000 多项 Web 平台测试，并且每周都在增加数百项测试并顺利通过。Cloudflare 还将 Kitesurf 的开发灵感归功于开源 Rust 无头引擎 Obscura，并指出其第一个概念验证就是将 Obscura 移植到 Workers 上。
The company said the browser correctly renders pages like TodoMVC, a popular benchmark application for comparing JavaScript frameworks, along with Wikipedia, Hacker News, the Cloudflare Blog, and much of the Cloudflare dashboard. 该公司表示，该浏览器可以正确渲染诸如 TodoMVC（用于比较 JavaScript 框架的流行基准测试应用程序）、维基百科、Hacker News、Cloudflare 博客以及大部分 Cloudflare 控制面板等页面。