Most old SQL databases allow table and column-level descriptions as a core feature. For distributed teams, or agile teams prototyping an app, it would be useful to be able to document/describe fields, expected/allowed values etc straight in the UI.

I'd like a Definitions tab after Find/Indexes in the Collections view where I can indicate BSON type and add a title/description for each field in my schema.

The JSON Schema Validation mechanism could be used as a basis for storing this information, since it already has a properties definition with a description for each field name in a document.