The guardrails' judge has its own command, and its trouble is shown

llmgw ctl guard judge status lists each judge model the policies ask:
in the catalog, as a judge, replicas ready, its last failure to answer, and
what is wrong in words. enable serves the missing one through model serve -
Llama Guard 3 1B on CPUs, role guard, under the name the policies give it -
with --replace for a model of that name that is not a judge; the console has
it under Do. GET /api/v1/guard/judges, and the summary's judges, put the
problem on ctl status and the console's Overview.

A Llama Guard file served from the mirror page is added as a judge, under
the name the policies ask, rather than as a model clients use the policies
never find. ctl says plainly when the API answers with a page.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/cli/ctl.go

@@ -116,6 +116,13 @@ func (c *ctlClient) do(ctx context.Context, method, path string, body, out any)
 	if out == nil {
 		return nil
 	}
+	// An older control plane answers a path it does not know with its
+	// dashboard: a page, which read as JSON said only "invalid character '<'".
+	if strings.HasPrefix(resp.Header.Get("Content-Type"), "text/html") {
+		return fmt.Errorf("%s %s answered with a page, not the API: the control plane answering "+
+			"(the leader, through a standby) does not know it — is it on an older release? "+
+			"llmgw ctl status says which it runs", method, path)
+	}
 	return json.NewDecoder(resp.Body).Decode(out)
 }