The road to the agentic browser: A Kitesurf update

Kitesurf, Cloudflare’s browser designed for AI agents, now supports WebMCP, enabling direct function calls like searchFlights() instead of pixel-based interactions. This allows agents to programmatically interact with websites such as Cloudflare Radar, which exposes tools like navigate-to and set-location in its DevTools panel. Users can test this in the public Kitesurf playground by enabling WebMCP in the Application tab of DevTools.

Kitesurf has expanded its support for browser standards, adding URL-based module resolution, JSON modules, import map handling, and improved iframe behavior. These updates enhance compatibility with modern JavaScript-heavy sites and improve rendering across languages and encodings. The browser now passes over 730,000 Web Platform Tests subtests, a significant increase from its launch benchmarks.

To optimize agentic workflows, Cloudflare has reduced latency in Kitesurf’s internals, focusing on lightweight DOM traversals, timers, and font fetches. Despite adding new standards, Kitesurf maintains performance close to its launch benchmarks, with some improvements in wall-clock time and CPU usage. Browser Run now offers full API coverage for Kitesurf, supporting tools like CDP, Playwright, Puppeteer, and MCP.

Kitesurf’s architecture separates PageScript and PageRenderer, allowing rendering logic to be offloaded to clients or other Workers while keeping security-critical code server-side. A demonstration moves PageRenderer to a Playground Worker, rendering pages in terminals via the Kitty protocol or ANSI text mode, enabling terminal-based browsing and agent-like page interaction.