Looking for Definition of Ready for UX and UI Stories [on hold]

We are struggling very hard with getting requirements. We have several documents that are in draft state or are summaries of what go into product. But when we ask for clear direction and WHAT is meant to be in the product and what is clearly confirmed or approved, we get static.

We got a suggestion to post a clear definition of ready as to what we need to do our work.

I thought we had been clear by stating that whatever a screen might need as far as content, form fields, needs for gathering or displaying data, all that...we need that detailed out.

Still, no one seems to be able to tell us what to prototype.

Anyone have any definition or ready that might be helpful in this situation?

Thanks!