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Hi Onn,
Either the ExcelFunction attribute or the Description attribute can be used to add a description for your function. You can confirm that the description is picked up by opening the "Function Arguments" dialog (from the fx button when entering a formula), and you'll see the registered description there.
For the additional in-sheet IntelliSense support, you either need to install the Excel-DNA IntelliSense add-in from here:
Releases · Excel-DNA/IntelliSense (github.com)or you must reference the ExcelDna.IntelliSense library from youir add-in, and load it with a call to IntelliSenseServer.Install() in your add-in's AutoOpen handler.
If you're trying these and it's still not working
-Govert