Hey Levon,
The "WebMCP testing" flag is in Chrome 146.0.7672.0 or higher, which is Canary according to
https://chromiumdash.appspot.com/releases If you can't get Chrome 146.0.7672.0 somehow and you
really want to play with WebMCP now:
- Either download latest chromium build that does not auto-update at
https://download-chromium.appspot.com/- Enable the "Experimental Web Platform features" flag at chrome://flags/#enable-experimental-web-platform-features in your current Chrome Canary.
Let me know if that works for you.