{
  description = "HermesControl - Android app for Hermes agent";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          config = {
            android_sdk.accept_license = true;
            allowUnfree = true;
          };
        };

        buildToolsVersion = "35.0.0";
        androidComposition = pkgs.androidenv.composeAndroidPackages {
          # Command-line & platform tools
          cmdLineToolsVersion = "11.0";
          platformToolsVersion = "35.0.2";

          # Build tools
          buildToolsVersions = [ buildToolsVersion "34.0.0" ];

          # Target platforms (36 required by AGP 9.0.1 / compileSdk 36)
          platformVersions = [ "36" "35" "34" ];

          # For the emulator (optional, remove if not needed)
          includeEmulator = false;
          includeSystemImages = false;

          # NDK (not needed for this project, but handy)
          includeNDK = false;

          # Extra packages
          extraLicenses = [
            "android-googletv-license"
            "android-sdk-arm-dbt-license"
            "android-sdk-license"
            "android-sdk-preview-license"
            "google-gdk-license"
            "intel-android-extra-license"
            "intel-android-sysimage-license"
            "mips-android-sysimage-license"
          ];
        };

        androidSdk = androidComposition.androidsdk;

      in {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            # Java 17 (required for AGP 8.x / Gradle 8.x)
            jdk17

            # Android SDK (platforms, build-tools, platform-tools)
            androidSdk

            # Kotlin compiler
            kotlin

            # Gradle
            gradle

            # Useful utilities
            ktlint        # Kotlin linter
          ];

          # Point everything at the Nix-managed SDK
          ANDROID_HOME = "${androidSdk}/libexec/android-sdk";
          ANDROID_SDK_ROOT = "${androidSdk}/libexec/android-sdk";
          JAVA_HOME = "${pkgs.jdk17}";

          # Gradle needs a writable home
          GRADLE_USER_HOME = "$PWD/.gradle-home";

          shellHook = ''
            echo "🤖 HermesControl Android dev shell"
            echo "   Java:        $(java -version 2>&1 | head -1)"
            echo "   Kotlin:      $(kotlin -version 2>&1)"
            echo "   Gradle:      $(gradle --version 2>&1 | grep '^Gradle' || echo 'available')"
            echo "   ANDROID_HOME: $ANDROID_HOME"
            echo ""

            # Make sure the android CLI from ~/.local/bin is on PATH
            export PATH="$HOME/.local/bin:$PATH"

            # Writable gradle home
            mkdir -p "$GRADLE_USER_HOME"
          '';
        };
      }
    );
}