{ pkgs, ... }:

{
  # mcp-nixos gives opencode + VS Code real NixOS package/option data instead of
  # hallucinated package names. Only installed on x1carbon (this module is only
  # imported from hosts/x1carbon), so it does not leak to other machines.
  home.packages = [
    pkgs.mcp-nixos
    # Gitea MCP server: browse/manage Gitea repos, issues, PRs from opencode.
    pkgs.gitea-mcp-server
  ];

  xdg.configFile."opencode/opencode.json".text = builtins.toJSON {
    "$schema" = "https://opencode.ai/config.json";
    provider = {
      # lmstudio = {
      #   npm = "@ai-sdk/openai-compatible";
      #   name = "LM Studio (local)";
      #   options = {
      #     baseURL = "http://127.0.0.1:1234/v1";
      #   };
      #   models = {
      #     "google/gemma-4-e4b" = {
      #       name = "Gemma 4 E4B (LM Studio)";
      #       limit = {
      #         context = 65536;
      #         output = 32768;
      #       };
      #     };
      #   };
      # };
      opencode-go = { };
    };
    model = "opencode-go/kimi-k2.6";
    lsp = {
      # nil (Nix language server, installed by nix-lsp.nix) as a custom LSP
      # server so the agent gets Nix diagnostics. Formatter: nixfmt (stdin).
      nil = {
        command = [ "${pkgs.nil}/bin/nil" ];
        extensions = [ ".nix" ];
        initialization = {
          nil = {
            formatting = {
              command = [
                "nixfmt"
                "-"
              ];
            };
          };
        };
      };
    };
    mcp = {
      # NixOS packages/options MCP server (stdlib CLI; binary provided by
      # pkgs.mcp-nixos). Use "the nix tool" to look up real package names,
      # options and versions while editing flake/host configs.
      nixos = {
        type = "local";
        command = [ "mcp-nixos" ];
        enabled = true;
      };
      # Gitea MCP server for the self-hosted instance (gitea.edley.me).
      # Token comes from the SOPS secret via $GITEA_ACCESS_TOKEN (exported in
      # zsh.nix) so it is never committed to the repo.
      gitea = {
        type = "local";
        command = [
          "gitea-mcp"
          "-t"
          "stdio"
          "-H"
          "https://gitea.edley.me"
          "-T"
          "{env:GITEA_ACCESS_TOKEN}"
        ];
        enabled = true;
      };
    };
  };
}