feat(opencode): add opencode configuration

users/modules/dev/ai/default.nix

@@ -2,7 +2,6 @@
   config,
   lib,
   pkgs,
-  inputs,
   ...
 }:
 with lib; let
@@ -12,6 +11,7 @@ in {
   imports = [
     ./claude.nix
     ./ollama.nix
+    ./opencode.nix
   ];
 
   options.home.dev.ai = {
@@ -29,8 +29,9 @@ in {
           mcpServers = mkDefault cfg.mcpServers;
         };
         ollama.enable = mkDefault cfg.enable;
+        opencode.enable = mkDefault cfg.enable;
       };
-      packages = [pkgs.lmstudio pkgs.opencode];
+      packages = [pkgs.lmstudio];
     };
     programs.mcp = mkIf (cfg.mcpServers != {}) {
       enable = true;

users/modules/dev/ai/opencode.nix

@@ -0,0 +1,85 @@
+{
+  config,
+  lib,
+  inputs,
+  pkgs,
+  ...
+}:
+with lib; let
+  inherit (pkgs.stdenv.hostPlatform) system;
+  cfg = config.home.dev.ai.opencode;
+  defaultPackageCli = inputs.opencode.packages.${system}.opencode;
+  defaultPackageDesktop = inputs.opencode.packages.${system}.desktop;
+  corsList = domains: lists.remove "" (lists.forEach (strings.splitString "," domains) trim);
+in {
+  options.home.dev.ai.opencode = {
+    enable = mkEnableOption "Enables OpenCode";
+    package = mkOption {
+      type = types.package;
+      default = defaultPackageCli;
+      description = "The CLI package for OpenCode";
+    };
+    settings = mkOption {
+      type = types.json;
+      default = {};
+    };
+    tui = mkOption {
+      type = types.json;
+      default = {};
+    };
+    desktop = {
+      enable = mkEnableOption "Enables the desktop app";
+      package = mkOption {
+        type = types.package;
+        default = defaultPackageDesktop;
+        description = "The desktop package for OpenCode";
+      };
+    };
+    web = {
+      enable = mkEnableOption "Enables OpenCode web";
+      extraArgs = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        example = [
+          "--hostname"
+          "0.0.0.0"
+        ];
+      };
+      cors = mkOption {
+        type = types.nullOr (types.either types.str types.path);
+        default = null;
+        example = "opencode.example.com,code.example.com";
+        description = ''
+          Either a string containing the domain allowed to connect to OpenCode’s web instance, or a file containing the target value. The latter is useful when using secret management if you don’t want to publicize the hostname of your OpenCode instance.
+
+          If you want to use multiple domains, you can separate them with a comma.
+        '';
+      };
+      mdns = {
+        enable = mkEnableOption "Enables mDNS with OpenCode";
+        hostname = mkOption {
+          type = types.nullOr types.str;
+          default = null;
+          example = "opencode.local";
+        };
+      };
+    };
+  };
+  config.programs.opencode = mkIf cfg.enable {
+    inherit (cfg) enable tui;
+    enableMcpIntegration = true;
+    extraPackages = with pkgs; [uv];
+    settings =
+      {
+        server = mkIf cfg.web.mdns.enable {
+          mdns = true;
+          mdnsDomain = mkIf (cfg.web.mdns.hostname != null) cfg.web.mdns.hostname;
+          cors = corsList cfg.web.cors;
+        };
+      }
+      // cfg.settings;
+    web = {
+      inherit (cfg.web) enable extraArgs;
+    };
+  };
+}