fix(a2a): preserve discovery name edit, default discovery headers, sync url on re-discover

- _build_merged_agent_card: prefer card-supplied name over agent_name so
  the discovery panel's editable 'Name (shown to API clients)' value is
  not silently overwritten by the internal identifier.
- async_safe_get call in fetch_well_known_card: pass headers or {} to
  avoid TypeError({**None, 'Host': ...}) when URL validation is enabled
  in production (default).
- agent_info handleApplyDiscoveredCard: set url: selection.upstream_url
  in fieldsToSet so re-discovery during edit refreshes the form's URL
  field for pure A2A agents (matches add_agent_form).

Co-authored-by: Yassin Kortam <yassin@berri.ai>

litellm/proxy/a2a/discovery.py

@@ -119,7 +119,12 @@ async def fetch_well_known_card(
             # redirect hop. Even though the discovery endpoint is admin-only,
             # we don't want a compromised admin key to be able to probe
             # internal infrastructure through this fetcher.
-            response = await async_safe_get(client, url, headers=headers)
+            # Pass ``headers or {}`` because ``async_safe_get`` (in the
+            # URL-validation path) uses ``kwargs.pop("headers", {})`` which
+            # returns ``None`` when the key is present-but-None, then crashes
+            # on ``{**None, "Host": ...}``. Default the kwarg to an empty
+            # dict so production (``user_url_validation=True``) doesn't 500.
+            response = await async_safe_get(client, url, headers=headers or {})
         except SSRFError as exc:
             last_error = f"{url}: {exc!s}"
             verbose_proxy_logger.debug(

litellm/proxy/agent_endpoints/endpoints.py

@@ -52,11 +52,16 @@ def _build_merged_agent_card(
 ) -> Dict[str, Any]:
     """Apply the LiteLLM-fronting merge to ``upstream_card`` for ``agent_id``."""
     proxy_base = _proxy_base_url(http_request)
+    # Prefer a card-supplied ``name`` (the discovery UI exposes an editable
+    # "Name (shown to API clients)" field that flows into
+    # ``agent_card_params.name``) over the internal ``agent_name`` identifier.
+    # Fall back to ``agent_name`` only when the card itself has no name.
+    card_name = upstream_card.get("name") if upstream_card else None
     return merge_agent_card(
         upstream_card,
         proxy_url=f"{proxy_base}/a2a/{agent_id}",
         proxy_base_url=proxy_base,
-        name=agent_name,
+        name=card_name or agent_name,
     )
 
 

ui/litellm-dashboard/src/components/agents/agent_info.tsx

@@ -131,6 +131,7 @@ const AgentInfoView: React.FC<AgentInfoViewProps> = ({
     const fieldsToSet: Record<string, any> = {
       name: selected_card.name,
       description: selected_card.description,
+      url: selection.upstream_url,
       streaming: Boolean(selected_card.capabilities?.streaming),
       skills,
       iconUrl: selected_card.iconUrl,