diff --git a/providers/__init__.py b/providers/__init__.py
index 1648881e83..a8f8a777a8 100644
--- a/providers/__init__.py
+++ b/providers/__init__.py
@@ -47,11 +47,6 @@ _ALIASES: dict[str, str] = {}
 _PROVIDER_LIST_CACHE: list[ProviderProfile] | None = None
 _discovered = False
 
-# These APIs accept a ``vendor/model`` identifier while the request is sent to
-# the aggregator. A target provider can have stricter message-shape support
-# than the aggregator's generic OpenAI-compatible transport profile.
-_AGGREGATOR_MODEL_PREFIX_PROVIDERS = frozenset({"openrouter"})
-
 # Repo-root ``plugins/model-providers/`` — populated at discovery time.
 _BUNDLED_PLUGINS_DIR = (
     Path(__file__).resolve().parent.parent / "plugins" / "model-providers"
@@ -91,17 +86,21 @@ def get_provider_profile(name: str) -> ProviderProfile | None:
 def routed_model_rejects_vision_tool_messages(provider: str, model: str) -> bool:
     """Whether an active route or its aggregator-targeted model rejects image tool parts.
 
-    ``openrouter`` sends vendor-prefixed model IDs (for example,
-    ``xiaomi/mimo-v2.5``), but its own profile cannot describe every routed
-    provider's tool-message compatibility. Preserve the transport profile as
-    the default and consult a registered target profile only for known
-    aggregators. Missing or unrecognized identities deliberately fail open.
+    Routing aggregators such as ``openrouter`` send vendor-prefixed model IDs
+    (for example, ``xiaomi/mimo-v2.5``), but their own profile cannot describe
+    every routed provider's tool-message compatibility. Preserve the transport
+    profile as the default and consult a registered target profile only for
+    routing aggregators. Missing or unrecognized identities deliberately fail open.
     """
     provider_name = str(provider or "").strip().lower()
     profile = get_provider_profile(provider_name)
     if profile is not None and profile.supports_vision_tool_messages is False:
         return True
-    if provider_name not in _AGGREGATOR_MODEL_PREFIX_PROVIDERS:
+    # Routing aggregators accept a ``vendor/model`` identifier while the request is sent
+    # to the aggregator; the target provider can have stricter message-shape support than
+    # the aggregator's generic OpenAI-compatible transport profile.
+    from hermes_cli.providers import is_routing_aggregator
+    if not is_routing_aggregator(provider_name):
         return False
 
     target_name, separator, _ = str(model or "").strip().partition("/")