feat: implement hgctl agent & mcp add subcommand (#3051)

hgctl/pkg/agent/agent.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2025 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package agent
+
+import (
+	"io"
+
+	"github.com/spf13/cobra"
+	cmdutil "k8s.io/kubectl/pkg/cmd/util"
+)
+
+func NewAgentCmd() *cobra.Command {
+	agentCmd := &cobra.Command{
+		Use:   "agent",
+		Short: "start the interactive agent window",
+		Run: func(cmd *cobra.Command, args []string) {
+			cmdutil.CheckErr(handleAgentInvoke(cmd.OutOrStdout()))
+		},
+	}
+
+	return agentCmd
+}
+
+func handleAgentInvoke(w io.Writer) error {
+
+	return getAgent().Start()
+}
+
+// Sub-Agent1:
+// 1. Parse the url provided by user to MCP server configuration.
+// 2. Publish the parsed MCP Server to Higress
+func addPrequisiteSubAgent() error {
+	return nil
+}