diff --git a/hosts/common/configs/system/btrfs/default.nix b/hosts/common/configs/system/btrfs/default.nix
index b0447e1..d561c6e 100644
--- a/hosts/common/configs/system/btrfs/default.nix
+++ b/hosts/common/configs/system/btrfs/default.nix
@@ -5,7 +5,5 @@
     interval = "weekly";
   };
 
-  environment.systemPackages = with pkgs; [
-    compsize
-  ];
+  environment.systemPackages = with pkgs; [ compsize ];
 }
diff --git a/hosts/common/configs/user/console/nix-develop/default.nix b/hosts/common/configs/user/console/nix-develop/default.nix
index 3b0d485..384d0bc 100644
--- a/hosts/common/configs/user/console/nix-develop/default.nix
+++ b/hosts/common/configs/user/console/nix-develop/default.nix
@@ -35,7 +35,16 @@
           done
 
           if [[ -z "$devshell" ]]; then
-            if [ ! -f flake.nix ]; then cp "${./template.nix}" flake.nix; fi
+            if [ ! -f flake.nix ]; then
+              cp "${./template.nix}" flake.nix
+              chmod 755 flake.nix
+            fi
+
+            if [ ! treefmt.nix ]; then
+              cp "${./treefmt.nix}" treefmt.nix
+              chmod 755 treefmt.nix
+            fi
+
             nix develop -c "$SHELL"
           else
             nix develop self#"$devshell" -c "$SHELL"
diff --git a/hosts/common/configs/user/console/nix-develop/template.nix b/hosts/common/configs/user/console/nix-develop/template.nix
index a5519d0..31c4790 100644
--- a/hosts/common/configs/user/console/nix-develop/template.nix
+++ b/hosts/common/configs/user/console/nix-develop/template.nix
@@ -8,21 +8,35 @@
     };
 
     flake-utils = {
-      url = "github:numtide/flake-utils";
+      type = "github";
+      owner = "numtide";
+      repo = "flake-utils";
+      ref = "main";
+    };
+
+    treefmt-nix = {
+      type = "github";
+      owner = "numtide";
+      repo = "treefmt-nix";
+      ref = "main";
+
+      inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
   outputs =
-    { nixpkgs, ... }@inputs:
+    { self, nixpkgs, ... }@inputs:
     inputs.flake-utils.lib.eachDefaultSystem (
       system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
+        treefmt = inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
       in
       {
-        devShells.default = pkgs.mkShell { packages = [ ]; };
+        devShells.default = pkgs.mkShell { packages = with pkgs; [ ]; };
 
-        formatter = pkgs.nixfmt-rfc-style;
+        formatter = treefmt.config.build.wrapper;
+        checks.formatting = treefmt.config.build.check self;
       }
     );
 }
diff --git a/hosts/common/configs/user/console/nix-develop/treefmt.nix b/hosts/common/configs/user/console/nix-develop/treefmt.nix
new file mode 100644
index 0000000..2819e9f
--- /dev/null
+++ b/hosts/common/configs/user/console/nix-develop/treefmt.nix
@@ -0,0 +1,19 @@
+{ ... }:
+{
+  projectRootFile = "flake.nix";
+
+  programs = {
+    nixfmt = {
+      enable = true;
+      strict = true;
+    };
+  };
+
+  settings = {
+    global = {
+      excludes = [
+        ".envrc"
+      ];
+    };
+  };
+}
diff --git a/hosts/common/configs/user/console/nix-direnv/default.nix b/hosts/common/configs/user/console/nix-direnv/default.nix
index e5f808d..c3c0795 100644
--- a/hosts/common/configs/user/console/nix-direnv/default.nix
+++ b/hosts/common/configs/user/console/nix-direnv/default.nix
@@ -49,8 +49,21 @@
               done
 
               if [[ -z "$devshell" ]]; then
-                echo "use flake" > .envrc
-                if [ ! -f flake.nix ]; then cp "${../nix-develop/template.nix}" flake.nix; fi
+                if "$hide"; then
+                  echo "use flake path:." > .envrc;
+                else
+                  echo "use flake" > .envrc;
+                fi
+
+                if [ ! -f flake.nix ]; then
+                  cp "${../nix-develop/template.nix}" flake.nix
+                  chmod 755 flake.nix
+                fi
+
+                if [ ! -f treefmt.nix ]; then
+                  cp "${../nix-develop/treefmt.nix}" treefmt.nix
+                  chmod 755 treefmt.nix
+                fi
               else
                 echo "use flake self#$devshell" > .envrc
               fi
@@ -62,6 +75,7 @@
                 if [ -z "$devshell" ]; then
                   if ! grep -q "^flake.nix$" "$top/.gitignore" "$top/.git/info/exclude"; then echo "flake.nix" >> "$top/.git/info/exclude"; fi
                   if ! grep -q "^flake.lock$" "$top/.gitignore" "$top/.git/info/exclude"; then echo "flake.lock" >> "$top/.git/info/exclude"; fi
+                  if ! grep -q "^treefmt.nix$" "$top/.gitignore" "$top/.git/info/exclude"; then echo "treefmt.nix" >> "$top/.git/info/exclude"; fi
                 fi
               fi