I don't know of any system that has a fantastic accountability mechanism around prorogation, to be honest. Some Westminster systems use what we call a cabinet manual. A cabinet manual is a non-binding document but it is something that a government can issue, usually in close collaboration with a Privy Council officer-equivalent. It is something that can lay out how the royal prerogative works. For instance, it's not going to bind the hand of the Prime Minister in terms of giving advice to the Governor General, but it can be something that lays out expectations. A prorogation occurs for a maximum of 30 days, for instance, or the Prime Minister should seek consensus in the House before advising prorogation. You can put that kind of language in a document like that to give a sense of how we use these things.
On January 28th, 2021. See this statement in context.