diff --git a/slop_with_models.py b/slop_with_models.py
index 23560ef..bf7bdad 100644
--- a/slop_with_models.py
+++ b/slop_with_models.py
@@ -114,12 +114,18 @@ def initialize_model_map():
 tools = {
     "calculator": {
         "id": "calculator",
-        "description": "Basic math",
+        "description": "Basic math calculator",
+        "arguments": [
+            { "name": "expression", "type": "str", "description": "the math expression to evaluate."}
+        ],
         "execute": lambda params: {"result": eval(params["expression"])},
     },
     "greet": {
         "id": "greet",
         "description": "Says hello",
+        "arguments": [
+            { "name": "name", "type": "str", "description": "name of person to greet"}
+        ],
         "execute": lambda params: {"result": f"Hello, {params['name']}!"},
     },
 }