diff --git a/cmd/email_messages.go b/cmd/email_messages.go
index 6a4694a..aef60c9 100644
--- a/cmd/email_messages.go
+++ b/cmd/email_messages.go
@@ -442,6 +442,84 @@ var emailMessagesPreviewCmd = &cobra.Command{
 	},
 }
 
+func runEmailMessageGuardian(cfg *config.Config, id string) (*loops.EmailMessageGuardianResponse, error) {
+	return newAPIClient(cfg).GetEmailMessageGuardian(id)
+}
+
+var emailMessagesGuardianCmd = &cobra.Command{
+	Use:   "guardian <id>",
+	Short: "Run Guardian content validation on an email message",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		cfg, err := loadConfig()
+		if err != nil {
+			return err
+		}
+
+		resp, err := runEmailMessageGuardian(cfg, args[0])
+		if err != nil {
+			return err
+		}
+
+		if isJSONOutput() {
+			return printJSON(cmd.OutOrStdout(), resp)
+		}
+
+		return printGuardianResponse(cmd, resp)
+	},
+}
+
+func printGuardianResponse(cmd *cobra.Command, resp *loops.EmailMessageGuardianResponse) error {
+	out := cmd.OutOrStdout()
+	if len(resp.Errors) == 0 && len(resp.Warnings) == 0 {
+		fmt.Fprintln(out, "No guardian issues found.")
+		return nil
+	}
+
+	if err := printGuardianSection(cmd, "Errors", resp.Errors); err != nil {
+		return err
+	}
+	if len(resp.Errors) > 0 && len(resp.Warnings) > 0 {
+		fmt.Fprintln(out)
+	}
+	return printGuardianSection(cmd, "Warnings", resp.Warnings)
+}
+
+func printGuardianSection(cmd *cobra.Command, heading string, rules []loops.GuardianRule) error {
+	if len(rules) == 0 {
+		return nil
+	}
+	fmt.Fprintf(cmd.OutOrStdout(), "%s:\n", heading)
+	t := newStyledTable(cmd.OutOrStdout(), "RULE", "TITLE", "DESCRIPTION", "ITEMS")
+	for _, r := range rules {
+		t.Row(r.Rule, r.Title, r.Description, formatGuardianItems(r.Items))
+	}
+	return t.Render()
+}
+
+// formatGuardianItems summarizes a rule's items as a count plus a short,
+// comma-separated list of item labels (falling back to codeName when a label
+// is empty). Returns "0" when there are no items.
+func formatGuardianItems(items []loops.GuardianRuleItem) string {
+	if len(items) == 0 {
+		return "0"
+	}
+	labels := make([]string, 0, len(items))
+	for _, item := range items {
+		label := item.Label
+		if label == "" {
+			label = item.CodeName
+		}
+		if label != "" {
+			labels = append(labels, label)
+		}
+	}
+	if len(labels) == 0 {
+		return fmt.Sprintf("%d", len(items))
+	}
+	return fmt.Sprintf("%d (%s)", len(items), strings.Join(labels, ", "))
+}
+
 func printLmxWarnings(cmd *cobra.Command, warnings []loops.LmxWarning) {
 	if len(warnings) == 0 {
 		return
@@ -460,6 +538,8 @@ func printLmxWarnings(cmd *cobra.Command, warnings []loops.LmxWarning) {
 func init() {
 	emailMessagesCmd.AddCommand(emailMessagesGetCmd)
 
+	emailMessagesCmd.AddCommand(emailMessagesGuardianCmd)
+
 	addEmailMessageFieldFlags(emailMessagesUpdateCmd)
 	emailMessagesUpdateCmd.Flags().StringP("expected-revision-id", "r", "", "Last-seen contentRevisionId. Get this from a prior 'email-messages get'. Mutually exclusive with --force.")
 	emailMessagesUpdateCmd.Flags().BoolP("force", "f", false, "Fetch the current revision and use it (overwrites any concurrent edits). Mutually exclusive with --expected-revision-id.")
diff --git a/cmd/email_messages_guardian_test.go b/cmd/email_messages_guardian_test.go
new file mode 100644
index 0000000..9fc0344
--- /dev/null
+++ b/cmd/email_messages_guardian_test.go
@@ -0,0 +1,87 @@
+package cmd
+
+import (
+	"net/http"
+	"testing"
+
+	loops "github.com/loops-so/loops-go"
+)
+
+func TestRunEmailMessageGuardian(t *testing.T) {
+	body := `{
+		"errors": [
+			{
+				"rule": "missing-unsubscribe",
+				"title": "Missing unsubscribe link",
+				"description": "Marketing emails must include an unsubscribe link.",
+				"items": [
+					{"label": "Footer", "codeName": "footer"}
+				]
+			}
+		],
+		"warnings": [
+			{
+				"rule": "broken-link",
+				"title": "Broken link",
+				"description": "One or more links may be broken.",
+				"items": [
+					{"label": "https://example.com/a", "codeName": "link-a"},
+					{"label": "https://example.com/b", "codeName": "link-b"}
+				]
+			}
+		]
+	}`
+
+	t.Run("returns errors and warnings", func(t *testing.T) {
+		serveJSON(t, http.StatusOK, body)
+		resp, err := runEmailMessageGuardian(cfg(t), "em_abc123")
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if len(resp.Errors) != 1 {
+			t.Fatalf("Errors len = %d, want 1", len(resp.Errors))
+		}
+		if resp.Errors[0].Rule != "missing-unsubscribe" {
+			t.Errorf("Errors[0].Rule = %q, want missing-unsubscribe", resp.Errors[0].Rule)
+		}
+		if len(resp.Errors[0].Items) != 1 || resp.Errors[0].Items[0].Label != "Footer" {
+			t.Errorf("Errors[0].Items = %+v, want one item labeled Footer", resp.Errors[0].Items)
+		}
+		if len(resp.Warnings) != 1 {
+			t.Fatalf("Warnings len = %d, want 1", len(resp.Warnings))
+		}
+		if len(resp.Warnings[0].Items) != 2 {
+			t.Errorf("Warnings[0].Items len = %d, want 2", len(resp.Warnings[0].Items))
+		}
+	})
+
+	t.Run("returns error on non-200 response", func(t *testing.T) {
+		serveJSON(t, http.StatusNotFound, `{"success":false,"message":"Email message not found"}`)
+		_, err := runEmailMessageGuardian(cfg(t), "em_missing")
+		if err == nil {
+			t.Fatal("expected error, got nil")
+		}
+	})
+}
+
+func TestFormatGuardianItems(t *testing.T) {
+	tests := []struct {
+		name  string
+		items []loops.GuardianRuleItem
+		want  string
+	}{
+		{"no items", nil, "0"},
+		{"label", []loops.GuardianRuleItem{{Label: "Footer"}}, "1 (Footer)"},
+		{"codeName fallback", []loops.GuardianRuleItem{{CodeName: "footer"}}, "1 (footer)"},
+		{"empty label and codeName", []loops.GuardianRuleItem{{}}, "1"},
+		{"multiple", []loops.GuardianRuleItem{{Label: "A"}, {Label: "B"}}, "2 (A, B)"},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := formatGuardianItems(tc.items)
+			if got != tc.want {
+				t.Errorf("formatGuardianItems() = %q, want %q", got, tc.want)
+			}
+		})
+	}
+}