New to this? Read it in simple words
- Cloudflare is building Kitesurf, a lighter web browser made for AI agents.
- It can now use WebMCP tools that websites choose to provide.
- This lets an agent call a clear function instead of copying a person’s clicks.
- Kitesurf is still a beta and Cloudflare has not released its source code yet.
- WebMCP
- A way for websites to offer clear tools that AI agents can call.
- Beta
- A test version that is available but may still have important limits.
- Open source
- Software whose code is public and can be studied or changed under its licence.
Most browsers were made for people. Cloudflare is building Kitesurf for agents that need page structure and tools more than perfect pictures. Its latest update lets agents call website functions directly.
WebMCP replaces fragile clicks
Cloudflare announced a major Kitesurf update on September 28. Kitesurf runs on Cloudflare Workers and is designed for AI agents. It is lighter than a full browser because it does not copy every feature people need.
The new version supports WebMCP. A website can expose a safe tool, such as searchFlights, and an agent can call it directly. The agent does not have to find a button, click it and hope the page behaves as expected.
Direct tools can be faster and easier to check. They also let the website owner define what actions exist. The site still needs clear permission and approval rules for sensitive steps.
Kitesurf remains a beta. Cloudflare says open-source release will come later.
More of the web now works
Cloudflare says Kitesurf now passes more than 730,000 Web Platform Test checks. That is about 500,000 more than at launch. These tests check whether browsers follow common web standards.
The update adds better support for page layout, custom elements, frames, fonts and JavaScript modules. Cloudflare also changed the browser engine to reduce repeated work and release unused memory.
Kitesurf now covers the full Browser Run API. Developers may control it through common browser tools or use simple actions for screenshots, HTML and PDF files.
Sources1
Useful beta, unfinished browser
Kitesurf remains free during its beta, with account limits. Cloudflare says it runs only on public Workers features. This lets the company test the same platform that customers use.
The company has not yet released Kitesurf as open source. It says this will happen, but gives no date. Some tasks that need video, WebGL or long saved sessions still fit a full browser better.
The bigger change is the move from agents copying human behaviour to websites offering machine-readable actions. That can improve reliability, but only if sites keep people informed and in control.
Sources
Every fact in this story comes from the sources below. Open them to check our work.
- 1
- 2
Test counts and performance statements are Cloudflare’s own measurements. Kitesurf is a beta and is not open source yet.
Cloudflare’s agent browser can now call website tools. Silicon AI News, September 29, 2026. https://siliconainews.com/stories/cloudflare-kitesurf-webmcp
Cloudflare’s agent browser gains website tool calls and wider web support, but it is still a beta and not yet open source. How we rate the mood
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