What it does
Websites can publish tools — named, described actions an AI agent
can call, like “search products” or “add to cart”. This is the WebMCP
proposal, and a site declares its tools either in JavaScript or as
annotated HTML forms.
Those tools are invisible: nothing on the page shows they exist. WebMCP
Inspector lists the ones the page you are viewing has published, shows the
arguments each expects, and lets you run them and see what comes back.
Getting started
- Install from the Mac App Store, then open Safari → Settings →
Extensions and switch on WebMCP Inspector.
- Safari will ask which sites it may read. It needs access to the site
you are testing to see that site’s tools.
- Open a page and click the WebMCP Inspector button in the toolbar.
Common questions
It says “No WebMCP tools” on every site.
That is usually correct. WebMCP is a new proposal and very few sites
publish tools yet. To confirm the extension works, try a site that does —
for example mcpixels.app, which
publishes six.
It says “Not inspected”.
The tab was open before the extension started watching it. Use the reload
button in the popup.
Does it work in other browsers?
This build is for Safari. Chrome has its own WebMCP inspectors, though
they need an experimental flag switched on; this one does not, because it
supplies the browser interface itself.
Does it send my data anywhere?
No. Nothing is collected, stored or transmitted. See the
privacy policy.
Contact
Questions, bug reports and feature requests:
filippapic97@gmail.com
Please include your macOS and Safari versions, and the site
you were looking at.