Cloudflare Open-Sources Kitesurf, a Stateless Browser Engine for AI Agents
Cloudflare has released Kitesurf, its stateless browser engine for AI agents running on Workers, as open source under the Apache 2.0 license.
US cloud computing company Cloudflare announced on November 13, 2026, that it has open-sourced Kitesurf, its stateless browser engine designed specifically for AI agents, on GitHub under the Apache 2.0 license. This fulfills the company's promise since the tool's initial release in August, allowing developers to inspect the code, run it locally, modify it, and deploy their own instances to the Cloudflare Workers platform.
Kitesurf aims to provide AI agents with a lightweight, efficient browser environment that runs entirely on Cloudflare Workers without traditional browser containers. It supports HTML parsing, CSS application, page JavaScript execution, and screenshot rendering, and is compatible with the Chrome DevTools Protocol (CDP), enabling connections with clients like Puppeteer. Compared to full browsers like Chromium, Kitesurf uses less CPU and memory and scales on demand across Cloudflare's global network.
The engine is built on Cloudflare's Developer Platform and a series of open-source Rust packages compiled to WebAssembly. Core components include Blitz for HTML parsing and layout, Stylo for CSS processing, Boa for running JavaScript inside WebAssembly, and Linebender libraries and Krilla for text layout and graphics generation. Kitesurf consists of three main parts: the Engine managing sessions, PageScript running page scripts, and PageRenderer drawing results.
Developers can clone the repository to start the engine locally for testing or deploy it to their own Cloudflare account to replace the Browser Run managed APIs. Note that deployment requires a paid Workers plan because Kitesurf uses Dynamic Workers to create isolated page workers. Although the project remains under heavy development with a focus on improving compatibility, reliability, and efficiency, its open-sourcing marks a significant advancement in server-side infrastructure for AI agents.