ycmd

Note if YouCompleteMe Vim plugin complains with;

ImportError: Python version mismatch: module was compiled for Python 3.13, but the interpreter version is incompatible: 3.10.18

... then set something similar to following in programs.vim.extraConfig;

let g:ycm_server_python_interpreter = "/nix/store/829wb290i87wngxlh404klwxql5v18p4-python3-3.13.7/bin/python3.13"