diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..57095db
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# Watch & reload direnv on change
+watch_file devshell.toml
+
+if [[ $(type -t use_flake) != function ]]; then
+  echo "ERROR: use_flake function missing."
+  echo "Please update direnv to v2.30.0 or later."
+  exit 1
+fi
+
+use flake
diff --git a/.gitignore b/.gitignore
index 8b2e868..4a10075 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,3 +33,4 @@
 
 /build/
 /bazel-*
+/.direnv
diff --git a/WORKSPACE b/WORKSPACE
index e69de29..442239c 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -0,0 +1 @@
+workspace(name = "cosmos-cli")
diff --git a/devshell.toml b/devshell.toml
new file mode 100644
index 0000000..9458329
--- /dev/null
+++ b/devshell.toml
@@ -0,0 +1,7 @@
+[env]
+FOO = "barh"
+
+[devshell]
+packages = [
+    "bazel",
+]
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..957aebb
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,57 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "ref": "main",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "revCount": 87,
+        "type": "git",
+        "url": "https://github.com/numtide/flake-utils"
+      },
+      "original": {
+        "ref": "main",
+        "type": "git",
+        "url": "https://github.com/numtide/flake-utils"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "narHash": "sha256-IIqmex9yVlfdy0+DSx0fqMhprDTEV6ZMFskW4GI4KK0=",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/23.05/nixos-23.05.861.d3bb401dcfc/nixexprs.tar.xz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/23.05/nixos-23.05.861.d3bb401dcfc/nixexprs.tar.xz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..4af23b3
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,48 @@
+{
+  description = "Cosmos CLI";
+
+  inputs = {
+    nixpkgs.url = "https://releases.nixos.org/nixos/23.05/nixos-23.05.861.d3bb401dcfc/nixexprs.tar.xz";
+    flake-utils.url = "git+https://github.com/numtide/flake-utils?ref=main";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+        nativeBuildInputs = with pkgs;
+        [
+          bazel_6
+          bazel-buildtools
+        ];
+        cosmos = pkgs.stdenv.mkDerivation {
+          name = "cosmos";
+          version = "0.0.1";
+          src = self;
+          nativeBuildInputs = nativeBuildInputs;
+          buildPhase = ''
+            bazel build //src:hello-world;
+          '';
+
+          installPhase = ''
+            mkdir -p $out/bin;
+            cp -r bazel-bin/src/hello-world $out/bin;
+          '';
+        };
+      in rec
+      {
+        defaultPackage = cosmos;
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = nativeBuildInputs ++ [
+            cosmos
+          ];
+        };
+
+        # default = pkgs.devshell.mkShell {
+        #   imports = [ (pkgs.devshell.importTOML ./devshell.toml) ];
+        # };
+
+      });
+}
diff --git a/result b/result
new file mode 120000
index 0000000..2f74c99
--- /dev/null
+++ b/result
@@ -0,0 +1 @@
+/nix/store/922i6v34m2r5r8q2qhb8gqflav3zry87-cosmos
\ No newline at end of file
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..8745f50
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1 @@
+(builtins.getFlake ("git+file://" + toString ./.)).devShells.${builtins.currentSystem}.default
diff --git a/tools/nix.sh b/tools/nix.sh
new file mode 100755
index 0000000..6f7c3b2
--- /dev/null
+++ b/tools/nix.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+nix flake lock --update-input nixpkgs
+nix flake update
diff --git a/tools/setup.sh b/tools/setup.sh
index 0418248..6290279 100755
--- a/tools/setup.sh
+++ b/tools/setup.sh
@@ -4,6 +4,8 @@
 
 brew install bazelisk
 
+# sh <(curl -L https://nixos.org/nix/install)
+
 # for linting
 brew install clang-format
 brew install buildifier