Currently the requirements for a repository are set out as:

Ensure your contribution is useful and relevant, with sufficient content and a clear, concise description for each item.Make sure your contribution is useful and relevant before submitting. That implies it has enough content and every item has a good succinct description.

This is a good description, but isn't very specific, meaning different reviewers and contributors may have different understandings of the requirements.

I propose that some formal requirements be established to help ensure the longevity of this repository, as they will make it easier for maintainers to evaluate requests and justify turning some down as well.

Finally, well defined requirements will help with automation efforts, giving better guides on what should be marked invalid and what not to.