Shipped WebMCP on a live host (publish a page from the browser)

[Steve]

Hi all,

We registered https://stacktr.ee for the WebMCP origin trial and now run it live across our marketing site and dashboard, so I'm sharing a real-world implementation and a little feedback in case it is useful to the team or others here.

Context: Stacktree is a private host for the HTML that AI agents emit, so the fit with WebMCP is direct. Our headline tool, stacktree_publish_html, lets a browsing agent generate a page and publish it to a live link in one call, with no sign-in. The same tool catalog also backs an in-page natural-language client (bring-your-own-key), so a person can describe a page in plain English and watch the agent build and publish it.

A few notes from shipping it:

• The removal model tripped us up at first. We had code from an earlier draft calling unregisterTool, which the shipped API does not have. Moving to an AbortController passed at registerTool and aborting it is clean once you know.
• First-party registration plus the origin-trial token (with subdomain matching) was smooth and worked across our apex, dashboard, and published subdomains from one token.
• We kept the public tool set small and side-effect-light (anonymous, ephemeral, rate-limited publishing plus read-only navigation) given the prompt-injection surface that's been flagged here. Account-scoped actions stay behind sign-in.

Happy to be a live example if that's useful. Short writeup and the registration code, including the AbortController detail: https://stacktr.ee/webmcp

Thanks for shipping the trial. 

Steve