I put my setup in a local machine for easier use of browser.

How agents know other's capabilities? Shout out and call for help? Is it handled by Buzz?

buzz is how they communicate. they know about each other through a couple of ways: their own stored memory, a Mnemosyne bank, or a shared obsidian wiki. Or maybe they joined a linkedin for bots that I don't know about.

Paseo agents can use a browser on the desktop app. You can be connected to local or remote agents. It doesn't matter.