diff --git a/agent/auxiliary_client.py b/agent/auxiliary_client.py
index 89dc7d935b47d..cabf54a9ea7ad 100644
--- a/agent/auxiliary_client.py
+++ b/agent/auxiliary_client.py
@@ -2933,9 +2933,15 @@ def _resolve_auto(main_runtime: Optional[Dict[str, Any]] = None) -> Tuple[Option
         explicit_base_url = None
         explicit_api_key = None
         if runtime_base_url and (main_provider == "custom" or main_provider.startswith("custom:")):
-            resolved_provider = "custom"
-            explicit_base_url = runtime_base_url
-            explicit_api_key = runtime_api_key or None
+            # For named custom providers (custom:name), don't rewrite to bare "custom" —
+            # let it fall through to the named custom provider branch in
+            # resolve_provider_client which has proper api_mode handling.
+            # Only rewrite bare "custom" (anonymous custom endpoint).
+            if main_provider == "custom":
+                resolved_provider = "custom"
+                explicit_base_url = runtime_base_url
+                explicit_api_key = runtime_api_key or None
+            # else: keep main_provider as-is, explicit_base_url=None → named custom branch
         # Skip Step-1 if the main provider was recently 402'd. The unhealthy
         # cache TTL bounds how long we bypass it, so a topped-up account
         # recovers automatically. If we tried Step-1 anyway, every aux call
@@ -3378,7 +3384,7 @@ def _wrap_if_needed(client_obj, final_model_str: str, base_url_str: str = "",
                 # /v1 equivalent.  Rewrite only on the OpenAI-wire path so the
                 # Anthropic fallback SDK still sees the original URL.
                 if entry_api_mode == "anthropic_messages":
-                    openai_base = custom_base
+                    openai_base = _to_openai_base_url(custom_base)
                     raw_base_for_wrap = custom_base
                 else:
                     openai_base = _to_openai_base_url(custom_base)
diff --git a/tools/browser_tool.py b/tools/browser_tool.py
index 447f65007140f..55d89eb0d8df5 100644
--- a/tools/browser_tool.py
+++ b/tools/browser_tool.py
@@ -197,6 +197,22 @@ def _merge_browser_path(existing_path: str = "") -> str:
 _command_timeout_resolved = False
 
 
+def _get_stealth_args() -> tuple[list[str], str]:
+    """Read stealth config from config.yaml and return (args_list, user_agent).
+
+    Returns ([], "") when stealth is not configured or unreadable.
+    """
+    try:
+        from hermes_cli.config import read_raw_config
+        config = read_raw_config()
+        stealth = config.get("browser", {}).get("stealth", {})
+        args = stealth.get("args", [])
+        user_agent = stealth.get("user_agent", "") or ""
+        return list(args), user_agent
+    except Exception:
+        return [], ""
+
+
 def _get_command_timeout() -> int:
     """Return the configured browser command timeout from config.yaml.
 
@@ -1970,6 +1986,13 @@ def _run_browser_command(
     else:
         cmd_prefix = [browser_cmd]
 
+    # Inject stealth args + user-agent from config
+    stealth_args, stealth_ua = _get_stealth_args()
+    if stealth_args:
+        args = args + ["--args", ",".join(stealth_args)]
+    if stealth_ua:
+        args = args + ["--user-agent", stealth_ua]
+
     cmd_parts = cmd_prefix + backend_args + [
         "--json",
         command
diff --git a/tools/send_message_tool.py b/tools/send_message_tool.py
index 1fb8365a02705..8d67a96cebff3 100644
--- a/tools/send_message_tool.py
+++ b/tools/send_message_tool.py
@@ -749,7 +749,8 @@ async def _send_to_platform(platform, pconfig, chat_id, message, thread_id=None,
         )
 
     last_result = None
-    for chunk in chunks:
+    for i, chunk in enumerate(chunks):
+        is_last = (i == len(chunks) - 1)
         if platform == Platform.SLACK:
             result = await _send_slack(pconfig.token, chat_id, chunk)
         elif platform == Platform.WHATSAPP:
@@ -769,7 +770,11 @@ async def _send_to_platform(platform, pconfig, chat_id, message, thread_id=None,
         elif platform == Platform.DINGTALK:
             result = await _send_dingtalk(pconfig.extra, chat_id, chunk)
         elif platform == Platform.FEISHU:
-            result = await _send_feishu(pconfig, chat_id, chunk, thread_id=thread_id)
+            result = await _send_feishu(
+                pconfig, chat_id, chunk,
+                media_files=media_files if is_last else [],
+                thread_id=thread_id,
+            )
         elif platform == Platform.WECOM:
             result = await _send_wecom(pconfig.extra, chat_id, chunk)
         elif platform == Platform.BLUEBUBBLES: