{
  description = "bug - a simplified CLI to git-bug";

  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 = nixpkgs.legacyPackages.${system};

        # Read the version from go.mod or use a default
        version = "1.5.0";

        # Build the bug CLI tool
        bug = pkgs.buildGoModule {
          pname = "bug";
          inherit version;
          src = ./.;

          # This is the vendor hash - update it when go.mod/go.sum changes
          # Run: nix build 2>&1 | grep "got:" | sed 's/.*got: *//'
          vendorHash = "sha256-CO/ynoBpljqysvljoEZP/Y1in5gRp+RHzTRVwZ9B9QQ=";

          # Build flags
          ldflags = [
            "-s" # Strip symbol table
            "-w" # Strip debug info
            "-X main.version=${version}"
          ];

          # Sub-packages to build (build all in root directory)
          subPackages = [ "." ];

          # Tests require git in PATH which isn't available in the sandbox
          # Run tests separately with: go test ./...
          doCheck = false;

          # Ship the agent skill with the binary so they always match;
          # devkit's enterShell copies it into ~/.agents/skills
          postInstall = ''
            install -Dm644 SKILL.md $out/share/bug/skills/working-with-bug/SKILL.md
          '';

          meta = with pkgs.lib; {
            description = "Simplified CLI to git-bug";
            homepage = "https://tangled.org/rtw.run/bug";
            license = licenses.mit;
            mainProgram = "bug";
            platforms = platforms.all;
          };
        };
      in
      {
        # Default package builds the bug CLI
        packages.default = bug;

        # Also expose the bug package directly
        packages.bug = bug;

        # Development shell with Go tooling
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            go
            gopls
            golangci-lint
          ];

          shellHook = ''
            echo "bug dev shell"
            echo "  Go version: $(go version)"
            echo "  Run 'make build' to build with nix"
            echo "  Run 'make test' to run tests"
          '';
        };

        # App for running directly
        apps.default = flake-utils.lib.mkApp {
          drv = bug;
          exePath = "/bin/bug";
        };
      });
}