diff --git a/python/packages/ag-ui/agent_framework_ag_ui/_endpoint.py b/python/packages/ag-ui/agent_framework_ag_ui/_endpoint.py
index ba6e9f5ddd..d1baad5561 100644
--- a/python/packages/ag-ui/agent_framework_ag_ui/_endpoint.py
+++ b/python/packages/ag-ui/agent_framework_ag_ui/_endpoint.py
@@ -91,4 +91,4 @@ async def event_generator():
             )
         except Exception as e:
             logger.error(f"Error in agent endpoint: {e}", exc_info=True)
-            return {"error": str(e)}
+            return {"error": "An internal error has occurred."}
diff --git a/python/packages/ag-ui/tests/test_endpoint.py b/python/packages/ag-ui/tests/test_endpoint.py
index b5846bbbf8..1ae364f818 100644
--- a/python/packages/ag-ui/tests/test_endpoint.py
+++ b/python/packages/ag-ui/tests/test_endpoint.py
@@ -154,7 +154,7 @@ async def test_endpoint_error_handling():
     assert response.status_code == 200
     content = json.loads(response.content)
     assert "error" in content
-    assert "Expecting value" in content["error"]
+    assert content["error"] == "An internal error has occurred."
 
 
 async def test_endpoint_multiple_paths():