When using renv in conjunction with VSCode, ìnteractions will the R terminal will not work properly unless languageserver and some other libraries are made available.
A smart way to fix this (i.e. avoiding having to install them in every single project) is by creating a "minimal" renv project and then linking its library as an external library to every other project via renv::settings$external.libraries().
Credit goes to Grant McDermott for figuring this out. [source]
This repo is my personal version of such a minimal library. Beyond VSCode-related libraries it also holds package development-related libraries that I often use. It is set to snapshot.type == "explicit" so the exact list can be found in the DESCRIPTION file.