diff --git a/config/.tmux-setup b/config/.tmux-setup
new file mode 100644
index 0000000..84674b0
--- /dev/null
+++ b/config/.tmux-setup
@@ -0,0 +1,4 @@
+tmux new-window -dn claude claude
+tmux new-window -dn scratch
+tmux rename-window editor
+nvim .
diff --git a/home/default.nix b/home/default.nix
index ee0e151..7b47758 100644
--- a/home/default.nix
+++ b/home/default.nix
@@ -33,6 +33,9 @@
     # AI
     claude-code
 
+    # Custom packages
+    (pkgs.callPackage ../pkgs/ax {})
+
     # Unstable packages (if needed)
     # pkgs-unstable.some-package
   ];
diff --git a/home/modules/tmux.nix b/home/modules/tmux.nix
index afa5bba..2c4d9ef 100644
--- a/home/modules/tmux.nix
+++ b/home/modules/tmux.nix
@@ -1,6 +1,11 @@
 { config, lib, pkgs, ... }:
 
 {
+  xdg.configFile.".tmux-setup" = {
+    source = ../../config/.tmux-setup;
+    executable = true;
+  };
+
   programs.tmux = {
     enable = true;
 
diff --git a/pkgs/ax/default.nix b/pkgs/ax/default.nix
new file mode 100644
index 0000000..5712425
--- /dev/null
+++ b/pkgs/ax/default.nix
@@ -0,0 +1,16 @@
+{ pkgs }:
+
+pkgs.buildGoModule {
+  pname = "ax";
+  version = "0.1.3";
+
+  src = pkgs.fetchgit {
+    url = "https://g.eliaskohout.de/eliaskohout/ax";
+    rev = "v0.1.3";
+    hash = "sha256-IlQMAynwthzcu9YaHgelEEk9KEubmDWBtyp+bkys99M=";
+  };
+
+  sourceRoot = "ax/src";
+
+  vendorHash = "sha256-+ZC1pQJzt7Cv7whzJ2r8OjWZ1C5MMGgmYYk0BEbPyJU=";
+}