The Sitecore Instance Manager (SIM) tool introduced local NuGet support, eliminating the need to manually manage library folders and track DLL versions. However, users implementing this feature encountered a problem: when I used the new DLLs, all my intellisense went away.

The Solution

Thanks to Jammy Kam via the Sitecore Slack community, the solution involves a straightforward configuration change:

Adjust each Sitecore DLL’s properties within Visual Studio, setting CopyLocal to true.

This simple modification restores intellisense functionality.

Important Note

If using Team Development for Sitecore (TDS) for package management, these DLLs must be excluded from the deployment package to prevent duplication.