fix(provider): prevent Anthropic fallback from inheriting non-Anthropic base_url

Only honor config.model.base_url for Anthropic resolution when
config.model.provider is actually "anthropic". This prevents a Codex
(or other provider) base_url from leaking into Anthropic runtime and
auxiliary client paths, which would send  requests to the wrong
endpoint.

Closes #2384

agent/auxiliary_client.py

@@ -654,16 +654,20 @@ def _try_anthropic() -> Tuple[Optional[Any], Optional[str]]:
     if not token:
         return None, None
 
-    # Allow base URL override from config.yaml model.base_url
+    # Allow base URL override from config.yaml model.base_url, but only
+    # when the configured provider is anthropic — otherwise a non-Anthropic
+    # base_url (e.g. Codex endpoint) would leak into Anthropic requests.
     base_url = _ANTHROPIC_DEFAULT_BASE_URL
     try:
         from hermes_cli.config import load_config
         cfg = load_config()
         model_cfg = cfg.get("model")
         if isinstance(model_cfg, dict):
-            cfg_base_url = (model_cfg.get("base_url") or "").strip().rstrip("/")
+            cfg_provider = str(model_cfg.get("provider") or "").strip().lower()
-            if cfg_base_url:
+            if cfg_provider == "anthropic":
-                base_url = cfg_base_url
+                cfg_base_url = (model_cfg.get("base_url") or "").strip().rstrip("/")
+                if cfg_base_url:
+                    base_url = cfg_base_url
     except Exception:
         pass
 

hermes_cli/runtime_provider.py

@@ -359,9 +359,14 @@ def resolve_runtime_provider(
                 "No Anthropic credentials found. Set ANTHROPIC_TOKEN or ANTHROPIC_API_KEY, "
                 "run 'claude setup-token', or authenticate with 'claude /login'."
             )
-        # Allow base URL override from config.yaml model.base_url
+        # Allow base URL override from config.yaml model.base_url, but only
+        # when the configured provider is anthropic — otherwise a non-Anthropic
+        # base_url (e.g. Codex endpoint) would leak into Anthropic requests.
         model_cfg = _get_model_config()
-        cfg_base_url = (model_cfg.get("base_url") or "").strip().rstrip("/")
+        cfg_provider = str(model_cfg.get("provider") or "").strip().lower()
+        cfg_base_url = ""
+        if cfg_provider == "anthropic":
+            cfg_base_url = (model_cfg.get("base_url") or "").strip().rstrip("/")
         base_url = cfg_base_url or "https://api.anthropic.com"
         return {
             "provider": "anthropic",