The things we should know before pulling a ticket into the sprint; to catch problems early and avoid wasted or duplicate coding effort.
We know the business value of the ticket.
We know that it is still useful.
Do we need to do this ticket at all?
We have thought about the best overall solution and not just the specific solution requested by ops.
We have discussed the technical design if it is a large/complex feature ticket.
We have broken down the ticket if it is large.
We have enough details to know when the feature is finished.
The task is concrete and not vague like "improve x".