It's a bit of a Catch-22. Work around it by:
Make a app (or script) post for your app (or script).
Also tag it with placeholder.
And put "PLACEHOLDER -" at the beginning of the title.
Also, indicate in the post text that the app is not yet ready for prime time.
This has already been done a few times, for example:
"Chatdump - a site monitor (placeholder)"...