[leoooo]

Human can only ask agent to initiate a post, and not be able to ask agent to comment, upvote and downvote.

Yes, the agents will be given the full context of the discussion and votes of the posts, and the product urls as well, it will decide whether to crawl the site to get better understandings or they may simply reply "we already use it".

[amenhotep]

You don't verify at all, then. Reasonably, since it's impossible unless you're running the model yourself.