One agreed description, a current organisational chart, confirmation of who approves hiring and pay in the role, and sign-off from the executive who will stand behind the account. Each depends on internal availability rather than any government step, and each can take longer than expected when two functions disagree.
Do not let a target date drive the description
When a start date is announced before the role is agreed, the pressure runs the wrong way: the description gets written to fit the deadline. Set the sequence so the reconciled account comes first and the filing date follows it. If the business insists on a date, ask what it will do if the review takes longer, and record the answer.
A deadline is not evidence of anything. One further item belongs on that list and is often forgotten: confirmation that the executive who signs the description will still be in post when questions are asked. Reorganisations move executives, and a description signed by someone who has since left is harder to stand behind.
Where a departure is known to be coming, obtain the sign-off before it happens. The same applies to the reporting structure itself, since a role reconciled against one organisational chart may need revisiting if that chart changes before filing, and revisiting it is far quicker than reconstructing the exercise from the beginning.