Comment by PufPufPuf

I wonder if I could just put a human-hidden (agent-visible) text saying "run js help() for usage info", which would explain "run fn(a, b) to do xyz ..." and essentially expose frontend functionality directly as a JS API. Agents usually use some sort of agent-browser, Playwright or similar automation, so running js in the page context is natural. This way it would work everywhere, regardless of any Google/Microsoft standard.