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Feature•Sep 28, 2026

Browser Run adds WebMCP to Kitesurf and moves to document.modelContext

Browser RunCloudflare · Developer platform

WebMCP now works in Kitesurf sessions as well as Lab sessions. Both backends use the document.modelContext API from the WebMCP Community Group draft. Lab sessions no longer expose navigator.modelContextTesting.

To list and run page tools:

  • Chrome DevTools: Use the Application > WebMCP panel in the live view of a Lab session or in the Kitesurf playground.
  • AI agents: Start Chrome DevTools MCP with the --category-experimental-webmcp flag to add the list_webmcp_tools and execute_webmcp_tool tools.
  • CDP clients: Use the WebMCP CDP domain.

Read the original announcement↗

More from Browser Run

All Browser Run updates →

  1. Connect multiple clients to one Browser Run session

    Browser Run sessions now accept multiple concurrent connections. Before, a session accepted only one connection at a time, and other Workers had to wait until that connection closed. Now multiple Workers can connect to the same browser at the same time.

    Browser Run•Feature•Sep 29, 2026

  2. Subscribe to Browser Run crawl events

    Browser Run crawl jobs can publish lifecycle events to Cloudflare Queues. Subscribe to started, updated, and finished events to track progress or trigger downstream processing without polling.

    Browser Run•Feature•Sep 25, 2026

  3. Browser Run adds session and DevTools methods to browser bindings

    Browser Run browser bindings now provide typed methods for session management and DevTools operations. You can acquire a session, connect a browser client, create Live View URLs, manage targets, and close sessions without constructing HTTP requests.

    Browser Run•Feature•Sep 21, 2026

  4. Inspect logs, network requests, and DOM in Session Recordings

    Browser Run Session Recordings now include an Inspect panel, giving you more context to understand what happened during a browser session without having to reproduce it.

    Browser Run•Feature•Sep 18, 2026

  5. Control which hostnames Browser Run sessions can access

    Browser Run now supports guardrails, which limit a browser session's HTTP and HTTPS requests to permitted hostnames.

    Browser Run•Feature•Sep 14, 2026