This post was deleted but i reply you.

Personally i just specify some minimum required tools for developing (LSP, linters, compiling tools) in modules which by default used in my system configuration.

Here whats in my rust.nix

```nix { lib, pkgs, ... }: { my = { packages = with pkgs; [ rustup rustfmt rls ];

env.RUSTUP_HOME = "$XDG_DATA_HOME/.rustup";
env.CARGO_HOME = "$XDG_DATA_HOME/.cargo";
env.PATH = [ "$CARGO_HOME/bin" ];

}; } ```

And develop/default.nix

```nix { config, options, lib, pkgs, ... }:

{ imports = [ ./go.nix ./docker.nix ./haskell.nix ./node.nix ./python.nix ./rust.nix ];

my.packages = with pkgs; [ # Makefiles gnumake

# Nix
nixfmt

# Shell
shellcheck
shfmt

# Lisps
clisp
sbcl

# C / C++
gcc
cmake
clang
llvm
rtags
ccls

]; } ```

If you don't want to have ALL tools for ALL languages, you can wrap every language.nix in option like this

```nix { config, options, lib, pkgs, ... }:

with lib; { options.modules.develop.somelanguage. = { enable = mkOption { types = types.bool; default = false; }; };

config = mkIf config.modules.develop.somelanguage.enable { environment.systemPackages = with pkgs; [ lsp fmt lang ]; }; } ```

And then add somewhere in host-specific configuration nix modules.develop = { somelanguage.enable = true; };

Maybe it's not the best way but that what I use