diff --git a/modules/home/claude-code/skills/nix/SKILL.md b/modules/home/claude-code/skills/nix/SKILL.md
new file mode 100644
index 0000000..ff02770
--- /dev/null
+++ b/modules/home/claude-code/skills/nix/SKILL.md
@@ -0,0 +1,11 @@
+---
+name: nix
+description: Expert Nix development assistance. Use when working with Nix code, .nix files, flakes, NixOS configuration, or when user mentions Nix, flake-parts, nixpkgs.
+---
+
+# Nix Development
+
+## Guidelines
+
+- Use **flake-parts** when creating new flakes
+- Format with **nixpkgs-fmt** after changes