The FOAM language server lives in its own repo: https://github.com/foam-foundation/FOAM-LSP
./build.sh lsp-install:<editor> # clone it into ~/.foam/lsp and set up an editor or MCP agent
./build.sh lsp-auto-update:false # stop builds updating the clone (saved)
./build.sh lsp-auto-update:true # turn it back on
./build.sh lsp-update # update by hand
An editor set up before the move still points at foam3/tools/lsp-start.js; run ./build.sh lsp-install:<editor> again to repoint it.