https://github.com/10gen/mongo/blob/7a04db83624d912d03bcbb4b2110416fb126b219/.vscode_defaults/linux-virtual-workstation.code-workspace#L9 should probably be --query-driver=/opt/mongodbtoolchain//bin/. The most pressing issue for me was that it wasn't correctly indexing WT code because it used clang rather than clang++. But rather than fixing just that problem we should just bless all binaries from all versions of the toolchain. If you really want to only bless clangs, then use /bin/clang.