To clarify, are you requesting CalibreSpy to support "The calibre:// URL scheme" as defined in
https://manual.calibre-ebook.com/url_scheme.html ?
If so, that is a big ask, since CalibreSpy does
not use Calibre's gui or guidb or gprefs or server or any other "live" part of Calibre.
CalibreSpy is explicitly designed to run when Calibre is not running at all, anywhere, in any way, since CalibreSpy was intended to be run from a .bat file multiple times simultaneously using only Calibre's metadata.db as a stand-alone SQLite database.
Could you clarify your request, and explain exactly how and when you would theoretically use what was copied to the OS clipboard from CalibreSpy?
Also, how that is not redundant with performing CalibreSpy multi-Library searches for matching books using "Clipboard Search Queries" while simultaneously viewing multiple Libraries in CalibreSpy as shown in this video example from 2018:
https://www.mobileread.com/forums/attachment.php?attachmentid=166302&d=1536956413
As well, CalibreSpy has my Drop Search Results plugin embedded with the DSR icon shown in the CS window. Simply Drag a book's textual path from any source that supports Dragging to the CS DSR icon.
Or, simply copy a books partial path found anywhere into the CalibreSpy Regular Expression Search box, click the binocular icons for "path", and it will filter based on that search.
Or,...
DaltonST