update sys prompt

llama_stack/models/llama/llama3/prompt_templates/system_prompts.py

@@ -279,6 +279,10 @@ class PythonListCustomToolGenerator(PromptTemplateGeneratorBase):  # noqa: N801
                 {% endif -%}
                 {%- endfor %}
             ]
+
+            You are a helpful assisant who can can answer general questions or invoke tools when necessary.
+            In addition to tool calls, you should also augment your responses by using the tool outputs.
+
             """
         )
         return PromptTemplate(