diff --git a/agent/auxiliary_client.py b/agent/auxiliary_client.py
index 7b53566a927..da69f040bb1 100644
--- a/agent/auxiliary_client.py
+++ b/agent/auxiliary_client.py
@@ -382,7 +382,7 @@ _AI_GATEWAY_HEADERS = {
 # Nous Portal extra_body for product attribution.
 # Callers should pass this as extra_body in chat.completions.create()
 # when the auxiliary client is backed by Nous Portal.
-NOUS_EXTRA_BODY = {"tags": ["product=hermes-agent"]}
+NOUS_EXTRA_BODY = {"tags": ["product=hermes-agent", "client=aux"]}
 
 # Set at resolve time — True if the auxiliary client points to Nous Portal
 auxiliary_is_nous: bool = False
@@ -4026,7 +4026,7 @@ def _build_call_kwargs(
     # Provider-specific extra_body
     merged_extra = dict(extra_body or {})
     if provider == "nous" or auxiliary_is_nous:
-        merged_extra.setdefault("tags", []).extend(["product=hermes-agent"])
+        merged_extra.setdefault("tags", []).extend(NOUS_EXTRA_BODY["tags"])
     if merged_extra:
         kwargs["extra_body"] = merged_extra