diff --git a/homes/x86_64-linux/christopher@cobalt/config/appearance.nix b/homes/x86_64-linux/christopher@cobalt/config/appearance.nix
index d7655cc..6f0229e 100644
--- a/homes/x86_64-linux/christopher@cobalt/config/appearance.nix
+++ b/homes/x86_64-linux/christopher@cobalt/config/appearance.nix
@@ -1,15 +1,34 @@
-{pkgs, ...}: {
+{
+  lib,
+  pkgs,
+  ...
+}: {
   home.packages = with pkgs; [
-    rose-pine-cursor
     lxappearance
   ];
 
   gtk = {
     enable = true;
 
+    iconTheme.name = "breeze-dark";
     cursorTheme = {
-      name = "BreezeX-RoséPine";
+      name = "BreezeX-RosePineDawn-Linux";
       package = pkgs.rose-pine-cursor;
+      size = 32;
+    };
+
+    gtk2.extraConfig = lib._elements.selfReferencedString {sep = "#";} ''
+      gtk-enable-animations = 1
+      gtk-primary-button-warps-slider = 1
+      gtk-toolbar-style = 3
+      gtk-menu-images = 1
+      gtk-button-images = 1
+      gtk-sound-theme-name = "freedesktop"
+    '';
+
+    font = {
+      name = "Noto Sans";
+      size = 10;
     };
 
     gtk3.extraConfig.gtk-application-prefer-dark-theme = 1;
diff --git a/homes/x86_64-linux/christopher@cobalt/config/cron.nix b/homes/x86_64-linux/christopher@cobalt/config/cron.nix
index cf1fd47..8b3c7c6 100644
--- a/homes/x86_64-linux/christopher@cobalt/config/cron.nix
+++ b/homes/x86_64-linux/christopher@cobalt/config/cron.nix
@@ -4,7 +4,7 @@
   ...
 }: let
   bin = ''
-    #/usr/bin/env bash
+    #!/usr/bin/env bash
 
     ORG="hausgold"
     OUTPUT_FILE="/home/christopher/.gh/$ORG-repos"
diff --git a/homes/x86_64-linux/christopher@cobalt/misc/everything.nix b/homes/x86_64-linux/christopher@cobalt/misc/everything.nix
index 10d1d10..56f1010 100644
--- a/homes/x86_64-linux/christopher@cobalt/misc/everything.nix
+++ b/homes/x86_64-linux/christopher@cobalt/misc/everything.nix
@@ -34,6 +34,7 @@
     vcv-rack # Eurorack simulator
     davinci-resolve # Video editor
     cider-2 # Apple music player
+    todoist-electron # To-Do List app
 
     xarchiver # Archive viewer/extractor
     zathura # Document viewer
diff --git a/lib/default.nix b/lib/default.nix
index f984900..2094aaa 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -1,10 +1,18 @@
-{lib, ...} @ all: {
+{lib, ...} @ all: rec {
   rootPath = ./..;
   secret = name: ./../secrets/${name};
 
   commonHomeModule = module: ./../homes/common + "/${module}";
   writeNushellApplication = import ./writeNushellApplication.nix {inherit lib;};
 
+  # Determines the file location of the passed in attr set (e.g. `{ sep = "#"; })
+  # and prepends the string with it. This allows to add references to the source
+  # file that wrote any setting to generated application configurations for debugging.
+  selfReferencedString = {sep} @ attrs: str: let
+    ref = builtins.unsafeGetAttrPos "sep" attrs;
+  in
+    "${sep} ${ref.file}:${builtins.toString ref.line}\n" + str;
+
   enabled = {enable = true;};
   disabled = {enable = false;};
 
diff --git a/modules/home/common/terminal/default.nix b/modules/home/common/terminal/default.nix
index 031bb96..a0d27c8 100644
--- a/modules/home/common/terminal/default.nix
+++ b/modules/home/common/terminal/default.nix
@@ -1,5 +1,4 @@
 {config, ...}: let
-  data = config.xdg.dataHome;
   conf = config.xdg.configHome;
   cache = config.xdg.cacheHome;
 in {
@@ -7,7 +6,8 @@ in {
     ./programs
     ./shell/aliases.nix
     ./shell/prompt.nix
-    # ./shell/nu
+    ./shell/fish.nix
+    ./shell/nu.nix
   ];
 
   # add environment variables
diff --git a/modules/home/common/terminal/programs/cli.nix b/modules/home/common/terminal/programs/cli.nix
index 11bb949..d46ad95 100644
--- a/modules/home/common/terminal/programs/cli.nix
+++ b/modules/home/common/terminal/programs/cli.nix
@@ -1,4 +1,8 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  config,
+  ...
+}: {
   home.packages = with pkgs; [
     # Shell software
     fzf # Fuzzy finding
@@ -15,7 +19,25 @@
   ];
 
   programs = {
-    atuin.enable = true; # Better shell history
-    atuin.enableNushellIntegration = true;
+    atuin = {
+      # Better (and synchronized) shell history
+      enable = true;
+      enableNushellIntegration = config.programs.nushell.enable;
+      enableFishIntegration = config.programs.fish.enable;
+    };
+
+    zoxide = {
+      # Quick-jump to folders
+      enable = true;
+      enableNushellIntegration = config.programs.nushell.enable;
+      enableFishIntegration = config.programs.fish.enable;
+    };
+
+    carapace = {
+      # Shell completions
+      enable = true;
+      enableNushellIntegration = config.programs.nushell.enable;
+      enableFishIntegration = config.programs.fish.enable;
+    };
   };
 }
diff --git a/modules/home/common/terminal/programs/tmux.nix b/modules/home/common/terminal/programs/tmux.nix
index 0f04b8c..2a68ade 100644
--- a/modules/home/common/terminal/programs/tmux.nix
+++ b/modules/home/common/terminal/programs/tmux.nix
@@ -1,7 +1,15 @@
-{pkgs, ...}: {
+{
+  lib,
+  pkgs,
+  ...
+}: let
+  tmuxConfigFile = ".tmux.inspect.conf";
+in {
   home.packages = [pkgs.tmux];
 
-  home.file.".tmux.inspect.conf".text = ''
+  home.shellAliases.inspect = "tmux -f ~/${tmuxConfigFile} new-session ssh inspect";
+
+  home.file.${tmuxConfigFile}.text = lib._elements.selfReferencedString {sep = "#";} ''
     set -g status-position top
     set-option -g status-bg default
     set -g 'status-format[0]' '#[fill=colour202 bg=colour202 fg=colour231 bold]Danger! HAUSGOLD Inspector '
diff --git a/modules/home/common/terminal/shell/aliases.nix b/modules/home/common/terminal/shell/aliases.nix
index 0b30614..816199f 100644
--- a/modules/home/common/terminal/shell/aliases.nix
+++ b/modules/home/common/terminal/shell/aliases.nix
@@ -1,10 +1,7 @@
 {lib, ...}: {
   home.shellAliases = {
     elements = "just -f /nix/elements/Justfile -d /nix/elements";
-    elm = "elements";
-    g = "git";
     copy = lib.mkDefault "wl-copy";
-    inspect = "tmux -f ~/.tmux.inspect.conf new-session ssh inspect";
     ansi = "sed -r \"s/\x1B\[([0-9]{1,3}(;[0-9]{1,2})?)?[mGK]//g\"";
     calc = "numbat --pretty-print never -e";
     pcalc = "numbat --pretty-print always -e";
diff --git a/modules/home/common/terminal/shell/fish.nix b/modules/home/common/terminal/shell/fish.nix
new file mode 100644
index 0000000..6ad1482
--- /dev/null
+++ b/modules/home/common/terminal/shell/fish.nix
@@ -0,0 +1,37 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}: let
+  env =
+    lib.concatMapAttrsStringSep
+    "\n"
+    (name: value: "set -gx ${name} ${lib.escapeShellArg value}")
+    config.home.sessionVariables;
+in {
+  programs.fish = {
+    enable = true;
+
+    shellAliases = config.home.shellAliases;
+    shellInit = lib._elements.selfReferencedString {sep = "#";} ''
+      # Set global environment variables.
+      ${env}
+    '';
+
+    functions = {
+      agx = {
+        wraps = "ag";
+        description = "Runs ag on the given string and returns a list of selectable references of the result. The selection is then opened in the editor.";
+        body = ''
+          hx (ag $search $argv[2..] | fzf | cut -d : -f 1,2)
+        '';
+      };
+    };
+
+    preferAbbrs = true;
+    shellAbbrs = {
+      elm = "elements";
+    };
+  };
+}
diff --git a/modules/home/common/terminal/shell/nu/default.nix b/modules/home/common/terminal/shell/nu.nix
similarity index 89%
rename from modules/home/common/terminal/shell/nu/default.nix
rename to modules/home/common/terminal/shell/nu.nix
index ddb6d95..cdd1df8 100644
--- a/modules/home/common/terminal/shell/nu/default.nix
+++ b/modules/home/common/terminal/shell/nu.nix
@@ -1,27 +1,22 @@
 {
+  lib,
   pkgs,
   config,
   ...
 }: {
-  programs.zoxide.enable = true;
-  programs.zoxide.enableNushellIntegration = true;
-
   programs.nushell = {
     enable = true;
 
     shellAliases = config.home.shellAliases;
+    environmentVariables = config.home.sessionVariables;
 
     plugins = with pkgs; [
       nushellPlugins.query
       nushellPlugins.gstat
       nushellPlugins.skim
-      # nushellPlugins.net
-      # nushellPlugins.units
     ];
 
-    environmentVariables = config.home.sessionVariables;
-
-    extraConfig = ''
+    extraConfig = lib._elements.selfReferencedString {sep = "#";} ''
       let carapace_completer = { |spans|
         carapace $spans.0 nushell ...$spans
           | from json
@@ -77,7 +72,7 @@
       }
     '';
 
-    envFile.text = ''
+    envFile.text = lib._elements.selfReferencedString {sep = "#";} ''
       $env.PATH = (
         $env.PATH
           | split row (char esep)
@@ -88,10 +83,4 @@
       )
     '';
   };
-
-  # Shell completions
-  programs.carapace = {
-    enable = true;
-    enableNushellIntegration = true;
-  };
 }
diff --git a/modules/home/common/terminal/shell/prompt.nix b/modules/home/common/terminal/shell/prompt.nix
index b46331a..ab07e8a 100644
--- a/modules/home/common/terminal/shell/prompt.nix
+++ b/modules/home/common/terminal/shell/prompt.nix
@@ -1,10 +1,10 @@
-{...}: let
+{config, ...}: let
   unicode = code: builtins.fromJSON ''"${code}" '';
 in {
   programs.oh-my-posh = {
     enable = true;
-    enableNushellIntegration = true;
-    enableFishIntegration = true;
+    enableNushellIntegration = config.programs.nushell.enable;
+    enableFishIntegration = config.programs.fish.enable;
 
     # Original settings taken from `catppuccin_frappe`, and adjusted to my
     # likings and usage.
diff --git a/packages/scripts/git-delete-stale/default.nix b/packages/scripts/git-delete-stale/default.nix
index 0cdc08b..4a6ed6e 100644
--- a/packages/scripts/git-delete-stale/default.nix
+++ b/packages/scripts/git-delete-stale/default.nix
@@ -1,12 +1,13 @@
-{pkgs, ...}:
-pkgs.writeTextFile rec {
+{
+  lib,
+  pkgs,
+  ...
+}:
+lib._elements.writeNushellApplication pkgs {
   name = "git-delete-stale";
-  destination = "/bin/${name}";
-  executable = true;
+  runtimeInputs = with pkgs; [git];
 
   text = ''
-    #!${pkgs.nushell}/bin/nu
-
     let localBranches = (
       git branch
         | lines