diff --git a/services/core-ai/main.py b/services/core-ai/main.py
index a029edf..ae02506 100644
--- a/services/core-ai/main.py
+++ b/services/core-ai/main.py
@@ -46,7 +46,7 @@ async def chat_completions(request):
 
         # Extract relevant fields from the request
         messages = data.get("messages")
-        model = data.get("model", "pydantic")
+        model = data.get("model", "Tatlock")
         stream = data.get("stream", False)
         conversation_id = data.get("conversation_id")
         enable_tools = data.get("enable_tools", True)
@@ -249,16 +249,11 @@ async def list_models(request):
         "object": "list",
         "data": [
             {
-                "id": "pydantic",
+                "id": "Tatlock",
                 "object": "model",
                 "created": int(time.time()),
-                "owned_by": "core-ai"
-            },
-            {
-                "id": "simple",
-                "object": "model",
-                "created": int(time.time()),
-                "owned_by": "core-ai"
+                "owned_by": "core-ai",
+                "description": "PydanticAI agent with full tool support - your British butler assistant"
             }
         ]
     })
@@ -295,10 +290,9 @@ async def health_check(request):
         "status": "ok",
         "service": "core-ai",
         "agents": {
-            "simple": True,
-            "pydantic": PYDANTIC_AI_AVAILABLE
+            "Tatlock": PYDANTIC_AI_AVAILABLE
         },
-        "default_agent": "pydantic" if PYDANTIC_AI_AVAILABLE else "simple",
+        "default_agent": "Tatlock" if PYDANTIC_AI_AVAILABLE else None,
         "tools_count": len(get_all_tools())
     })