diff --git a/README.md b/README.md
index 5a61c05..b3b0208 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,19 @@ These tools are essential for a capable openclaw instance - screen capture, came
 - **Fresh**: CI keeps tools and skills at latest automatically
 - **Integrated**: Skills teach your bot how to use each tool
 
+## Pure Nix and Home Manager design
+
+This repo is meant to be consumable directly from Nix flakes, Darwin, and Home
+Manager configs. Packages should stay pinned and reproducible, and optional
+Home Manager modules should expose normal `programs.<name>` options instead of
+requiring downstream users to hand-write app bundle or launchd glue.
+
+For macOS app bundles, prefer a Nix package plus Home Manager integration. Home
+Manager can expose app bundles from `home.packages` through its Darwin app
+targets, and modules can opt into `launchd.agents` when Home Manager should own
+startup. Homebrew casks are still useful, but they belong in a nix-darwin
+Homebrew configuration, not in these pure Nix package/module definitions.
+
 ## What's included
 
 | Tool | What it does |
@@ -31,6 +44,7 @@ These tools are essential for a capable openclaw instance - screen capture, came
 | [**poltergeist**](https://github.com/steipete/poltergeist) | Universal file watcher with auto-rebuild |
 | [**sag**](https://github.com/steipete/sag) | Command-line ElevenLabs TTS with mac-style flags |
 | [**imsg**](https://github.com/steipete/imsg) | iMessage/SMS CLI |
+| [**CodexBar**](https://github.com/steipete/CodexBar) | macOS menu bar app for Codex, Claude, and other provider usage |
 
 ## Usage (as openclaw plugins)
 
@@ -63,6 +77,7 @@ inputs.nix-steipete-tools.packages.aarch64-darwin.camsnap
 inputs.nix-steipete-tools.packages.aarch64-darwin.discrawl
 inputs.nix-steipete-tools.packages.aarch64-darwin.peekaboo
 inputs.nix-steipete-tools.packages.aarch64-darwin.wacrawl
+inputs.nix-steipete-tools.packages.aarch64-darwin.codexbar-app
 # etc.
 
 # Linux examples:
@@ -73,6 +88,41 @@ inputs.nix-steipete-tools.packages.x86_64-linux.summarize
 inputs.nix-steipete-tools.packages.x86_64-linux.wacrawl
 ```
 
+### Home Manager modules
+
+Some packages also ship Home Manager modules so they can be enabled directly
+without hand-writing install and launchd wiring. For CodexBar:
+
+```nix
+{
+  imports = [ inputs.nix-steipete-tools.homeManagerModules.codexbar ];
+
+  programs.codexbar.enable = true;
+}
+```
+
+That adds the CodexBar app package to `home.packages`. Home Manager can then
+expose the app bundle through its Darwin app targets. If you want Home Manager
+to own startup too, enable the launchd agent explicitly:
+
+```nix
+{
+  programs.codexbar = {
+    enable = true;
+    launchd.enable = true;
+    launchd.keepAlive = false;
+  };
+}
+```
+
+### macOS app bundles
+
+If you only want the raw app package, use the package output directly:
+
+```nix
+inputs.nix-steipete-tools.packages.aarch64-darwin.codexbar-app
+```
+
 ## Skills syncing
 
 Skills are vendored from [openclaw/openclaw](https://github.com/openclaw/openclaw) main branch. No pinning - we track latest.
diff --git a/flake.nix b/flake.nix
index 08241bb..6fb9b3d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,6 +22,7 @@
         poltergeist = [ "aarch64-darwin" ];
         sag = [ "aarch64-darwin" "x86_64-linux" ];
         imsg = [ "aarch64-darwin" ];
+        codexbar-app = [ "aarch64-darwin" ];
       };
     in {
       packages = forAllSystems (system:
@@ -66,8 +67,16 @@
           // (lib.optionalAttrs (supports "imsg") {
             imsg = pkgs.callPackage ./nix/pkgs/imsg.nix {};
           })
+          // (lib.optionalAttrs (supports "codexbar-app") {
+            codexbar-app = pkgs.callPackage ./nix/pkgs/codexbar-app.nix {};
+          })
       );
 
+      homeManagerModules = {
+        codexbar = import ./nix/modules/home-manager/codexbar.nix { inherit self; };
+        default = self.homeManagerModules.codexbar;
+      };
+
       checks = forAllSystems (system: self.packages.${system});
     };
 }
diff --git a/nix/modules/home-manager/codexbar.nix b/nix/modules/home-manager/codexbar.nix
new file mode 100644
index 0000000..8dfa2c6
--- /dev/null
+++ b/nix/modules/home-manager/codexbar.nix
@@ -0,0 +1,88 @@
+{ self }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit (lib) mkEnableOption mkIf mkOption types;
+  cfg = config.programs.codexbar;
+  system = pkgs.stdenv.hostPlatform.system;
+  defaultPackage =
+    if self.packages ? ${system} && self.packages.${system} ? codexbar-app then
+      self.packages.${system}.codexbar-app
+    else
+      null;
+in
+{
+  options.programs.codexbar = {
+    enable = mkEnableOption "CodexBar macOS menu bar app";
+
+    package = mkOption {
+      type = types.nullOr types.package;
+      default = defaultPackage;
+      defaultText = lib.literalExpression "inputs.nix-steipete-tools.packages.\${pkgs.system}.codexbar-app";
+      description = "CodexBar app package.";
+    };
+
+    launchd = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Configure a launchd agent to manage the CodexBar process.
+
+          CodexBar can also manage launch-at-login from inside the app. Enable this
+          option when you want Home Manager and launchd to own startup instead.
+        '';
+      };
+
+      keepAlive = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether launchd should restart CodexBar after it exits.";
+      };
+
+      environmentVariables = mkOption {
+        type = types.attrsOf types.str;
+        default = {
+          PATH = "${config.home.profileDirectory}/bin:/usr/bin:/bin:/usr/sbin:/sbin";
+        };
+        defaultText = lib.literalExpression ''
+          {
+            PATH = "\${config.home.profileDirectory}/bin:/usr/bin:/bin:/usr/sbin:/sbin";
+          }
+        '';
+        description = "Environment variables passed to the CodexBar launchd agent.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "programs.codexbar" pkgs lib.platforms.darwin)
+      {
+        assertion = cfg.package != null;
+        message = "programs.codexbar.package must be set on this platform.";
+      }
+      {
+        assertion = !cfg.launchd.enable || config.launchd.enable;
+        message = "programs.codexbar.launchd.enable requires launchd.enable.";
+      }
+    ];
+
+    home.packages = lib.mkIf (cfg.package != null) [ cfg.package ];
+
+    launchd.agents.codexbar = mkIf cfg.launchd.enable {
+      enable = true;
+      config = {
+        ProgramArguments = [ "${cfg.package}/Applications/CodexBar.app/Contents/MacOS/CodexBar" ];
+        ProcessType = "Interactive";
+        RunAtLoad = true;
+        KeepAlive = cfg.launchd.keepAlive;
+        EnvironmentVariables = cfg.launchd.environmentVariables;
+      };
+    };
+  };
+}
diff --git a/nix/pkgs/codexbar-app.nix b/nix/pkgs/codexbar-app.nix
new file mode 100644
index 0000000..c5ab0ef
--- /dev/null
+++ b/nix/pkgs/codexbar-app.nix
@@ -0,0 +1,37 @@
+{
+  lib,
+  stdenvNoCC,
+  fetchzip,
+}:
+
+stdenvNoCC.mkDerivation {
+  pname = "codexbar-app";
+  version = "0.23";
+
+  src = fetchzip {
+    url = "https://github.com/steipete/CodexBar/releases/download/v0.23/CodexBar-0.23.zip";
+    hash = "sha256-4LtZZzoP9tofNhy8jVkaopE+aivn0PRBEeJBGpDnbE8=";
+    stripRoot = false;
+  };
+
+  dontUnpack = true;
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p "$out/Applications"
+    app_path="$(find "$src" -maxdepth 2 -name 'CodexBar.app' -print -quit)"
+    if [ -z "$app_path" ]; then
+      echo "CodexBar.app not found in $src" >&2
+      exit 1
+    fi
+    cp -R "$app_path" "$out/Applications/CodexBar.app"
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "CodexBar macOS menu bar app bundle";
+    homepage = "https://github.com/steipete/CodexBar";
+    license = licenses.mit;
+    platforms = [ "aarch64-darwin" ];
+  };
+}