Add GH Copilot cli

modules/home/copilot-cli/default.nix

@@ -0,0 +1,94 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.modules.home.copilot-cli;
+  jsonFormat = pkgs.formats.json { };
+in
+{
+  options = {
+    modules.home.copilot-cli = {
+      enable = lib.mkEnableOption "copilot-cli" // {
+        description = "Enable Copilot CLI";
+        default = false;
+      };
+      package = lib.mkOption {
+        type = lib.types.nullOr lib.types.package;
+        default = pkgs.github-copilot-cli;
+        description = "Package to use (null to skip installing)";
+      };
+
+      configDir = lib.mkOption {
+        type = lib.types.str;
+        default = "${config.home.homeDirectory}/.copilot";
+        description = "Directory holding configuration files";
+      };
+
+      enableMcpIntegration = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = "Whether to integrate MCP servers from programs.mcp.servers";
+      };
+
+      settings = lib.mkOption {
+        inherit (jsonFormat) type;
+        default = { };
+        description = "JSON configuration written to config.json";
+      };
+
+      context = lib.mkOption {
+        type = lib.types.either lib.types.lines lib.types.path;
+        default = "";
+        description = ''
+          Global instructions, written to copilot-instructions.md.
+          Either inline content as a string or a path to a file.
+        '';
+      };
+
+      mcpServers = lib.mkOption {
+        type = lib.types.attrsOf jsonFormat.type;
+        default = { };
+        description = "MCP (Model Context Protocol) servers configuration";
+      };
+
+      lspServers = lib.mkOption {
+        type = lib.types.attrsOf jsonFormat.type;
+        default = { };
+        description = "LSP (Language Server Protocol) servers configuration";
+      };
+
+      agents = lib.mkOption {
+        type = lib.types.either (lib.types.attrsOf (lib.types.either lib.types.lines lib.types.path)) lib.types.path;
+        default = { };
+        description = "Custom agents (attrset or path to directory)";
+      };
+
+      skills = lib.mkOption {
+        type = lib.types.either (lib.types.attrsOf (lib.types.either lib.types.lines lib.types.path)) lib.types.path;
+        default = { };
+        description = "Custom skills (attrset or path to directory)";
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.github-copilot-cli = {
+      enable = true;
+      inherit (cfg)
+        package
+        configDir
+        enableMcpIntegration
+        settings
+        context
+        mcpServers
+        lspServers
+        agents
+        skills
+        ;
+    };
+  };
+}

modules/home/default.nix

@@ -8,6 +8,7 @@
     ./awscli
     ./bash
     ./claude-code
+    ./copilot-cli
     ./delta
     ./direnv
     ./distrobox