the file you have shown at begin has no description in the header (before globs). Thats why it shows no description in MDC editor. As with any code editing it may need rules for what the requirements for Cursors MDC are…
Sample header (not complete, just edit one MDC file manually in MDC editor and then see the structure in text editor_
---
name: My Awesome Document
description: An example of MDC file
glob:
---
rest of content