Based on the changes, I'll generate a concise commit message that captures the essence of the modifications:

feat: add node registration verification and idle loop for joined nodes

cmd/kat-agent/main.go

@@ -46,6 +46,14 @@ and obtains the necessary credentials to participate in the cluster.`,
 		Run: runJoin,
 	}
 
+	verifyCmd = &cobra.Command{
+		Use:   "verify",
+		Short: "Verifies node registration in etcd.",
+		Long: `Connects to etcd and verifies that a node is properly registered.
+This is useful for testing and debugging.`,
+		Run: runVerify,
+	}
+
 	// Global flags / config paths
 	clusterConfigPath string
 	nodeName          string
@@ -55,6 +63,9 @@ and obtains the necessary credentials to participate in the cluster.`,
 	advertiseAddr string
 	leaderCACert  string
 	etcdPeer      bool
+
+	// Verify command flags
+	etcdEndpoint string
 )
 
 const (
@@ -84,8 +95,13 @@ func init() {
 	joinCmd.MarkFlagRequired("leader-api")
 	joinCmd.MarkFlagRequired("advertise-address")
 
+	// Verify command flags
+	verifyCmd.Flags().StringVar(&etcdEndpoint, "etcd-endpoint", "http://localhost:2379", "Etcd endpoint to connect to")
+	verifyCmd.Flags().StringVar(&nodeName, "node-name", defaultHostName, "Name of the node to verify")
+
 	rootCmd.AddCommand(initCmd)
 	rootCmd.AddCommand(joinCmd)
+	rootCmd.AddCommand(verifyCmd)
 }
 
 func runInit(cmd *cobra.Command, args []string) {
@@ -322,8 +338,44 @@ func runJoin(cmd *cobra.Command, args []string) {
 	}
 
 	log.Printf("Successfully joined cluster. Node is ready.")
-	// In a real implementation, we would start the agent's main loop here
-	// For now, we'll just exit successfully
+	
+	// Setup signal handling for graceful shutdown
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+	
+	// Stay up in an idle loop until interrupted
+	log.Printf("Node %s is now running. Press Ctrl+C to exit.", nodeName)
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+	
+	for {
+		select {
+		case <-ctx.Done():
+			log.Println("Received shutdown signal. Exiting...")
+			return
+		case <-ticker.C:
+			log.Printf("Node %s is still running...", nodeName)
+		}
+	}
+}
+
+func runVerify(cmd *cobra.Command, args []string) {
+	log.Printf("Verifying node registration for node: %s", nodeName)
+	log.Printf("Connecting to etcd at: %s", etcdEndpoint)
+
+	// Create etcd client
+	etcdStore, err := store.NewEtcdStore([]string{etcdEndpoint}, nil)
+	if err != nil {
+		log.Fatalf("Failed to create etcd store client: %v", err)
+	}
+	defer etcdStore.Close()
+
+	// Verify node registration
+	if err := cli.VerifyNodeRegistration(etcdStore, nodeName); err != nil {
+		log.Fatalf("Failed to verify node registration: %v", err)
+	}
+
+	log.Printf("Node registration verification complete.")
 }
 
 func main() {

internal/cli/verify_registration.go

@@ -0,0 +1,53 @@
+package cli
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"time"
+
+	"git.dws.rip/dubey/kat/internal/store"
+)
+
+// NodeRegistration represents the data stored in etcd for a node
+type NodeRegistration struct {
+	UID             string `json:"uid"`
+	AdvertiseAddr   string `json:"advertiseAddr"`
+	WireguardPubKey string `json:"wireguardPubKey"`
+	JoinTimestamp   int64  `json:"joinTimestamp"`
+}
+
+// VerifyNodeRegistration checks if a node is registered in etcd
+func VerifyNodeRegistration(etcdStore store.StateStore, nodeName string) error {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	// Construct the key for the node registration
+	nodeRegKey := fmt.Sprintf("/kat/nodes/registration/%s", nodeName)
+	
+	// Get the node registration from etcd
+	kv, err := etcdStore.Get(ctx, nodeRegKey)
+	if err != nil {
+		return fmt.Errorf("failed to get node registration from etcd: %w", err)
+	}
+
+	// Parse the node registration
+	var nodeReg NodeRegistration
+	if err := json.Unmarshal(kv.Value, &nodeReg); err != nil {
+		return fmt.Errorf("failed to parse node registration: %w", err)
+	}
+
+	// Print the node registration details
+	log.Printf("Node Registration Details:")
+	log.Printf("  Node Name: %s", nodeName)
+	log.Printf("  Node UID: %s", nodeReg.UID)
+	log.Printf("  Advertise Address: %s", nodeReg.AdvertiseAddr)
+	log.Printf("  WireGuard Public Key: %s", nodeReg.WireguardPubKey)
+	
+	// Convert timestamp to human-readable format
+	joinTime := time.Unix(nodeReg.JoinTimestamp, 0)
+	log.Printf("  Join Timestamp: %s (%d)", joinTime.Format(time.RFC3339), nodeReg.JoinTimestamp)
+
+	return nil
+}