diff --git a/run_agent.py b/run_agent.py
index d76894cf05b..34d591e59a8 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -3213,8 +3213,16 @@ class AIAgent:
             cfg = load_config()
             provider = (getattr(self, "provider", "") or "").strip()
             model = (getattr(self, "model", "") or "").strip()
-            for keys in (("model", "supports_vision"),
-                         ("providers", provider, "models", model, "supports_vision")):
+            # self.provider is the runtime-resolved value, which is rewritten
+            # to "custom" for named custom providers (see
+            # hermes_cli/runtime_provider.py:_resolve_named_custom_runtime),
+            # while the config still holds the user-declared name (e.g.
+            # "my-vllm") under model.provider. Try both as provider keys.
+            config_provider = str(cfg_get(cfg, "model", "provider") or "").strip()
+            candidates = [("model", "supports_vision")]
+            for p in dict.fromkeys(filter(None, (provider, config_provider))):
+                candidates.append(("providers", p, "models", model, "supports_vision"))
+            for keys in candidates:
                 override = cfg_get(cfg, *keys)
                 if override is not None:
                     return bool(override)
diff --git a/tests/run_agent/test_vision_aware_preprocessing.py b/tests/run_agent/test_vision_aware_preprocessing.py
index 08fe6502e96..056754862cc 100644
--- a/tests/run_agent/test_vision_aware_preprocessing.py
+++ b/tests/run_agent/test_vision_aware_preprocessing.py
@@ -186,6 +186,21 @@ class TestModelSupportsVision:
              patch("agent.models_dev.get_model_capabilities", return_value=None):
             assert agent._model_supports_vision() is True
 
+    def test_named_custom_provider_resolved_via_config_provider(self):
+        # Named custom providers get runtime self.provider rewritten to
+        # "custom" while the config keeps the original name under
+        # model.provider. The override must still resolve.
+        agent = _make_agent()
+        agent.provider = "custom"
+        agent.model = "my-llava"
+        cfg = {
+            "model": {"provider": "my-vllm", "default": "my-llava"},
+            "providers": {"my-vllm": {"models": {"my-llava": {"supports_vision": True}}}},
+        }
+        with patch("hermes_cli.config.load_config", return_value=cfg), \
+             patch("agent.models_dev.get_model_capabilities", return_value=None):
+            assert agent._model_supports_vision() is True
+
     def test_override_false_disables_vision_for_models_dev_models(self):
         agent = _make_agent()
         fake_caps = MagicMock()