{
  description = "Anthropic API proxy with OAuth key rotation";

  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.allowUnfree = true;
        };
      in
      {
        packages = {
          proxy = pkgs.callPackage ./package.nix {};
        };

        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            go
            gopls
            gotools
            go-tools
            delve
            curl
            jq
            claude-code
            opencode
            mitmproxy
          ];

          shellHook = ''
            export GOPATH="$PWD/.go"
            export PATH="$GOPATH/bin:$PATH"
          '';
        };
      }
    );
}