Fix system prompt

CustomAgent.py

@@ -10,11 +10,12 @@ class CustomAgent(BasicAgent):
     def __init__(self):
         super().__init__()
         self._system_prompt = """\
-You are a general AI assistant. I will ask you a question. Report your thoughts, and finish your answer like so: [YOUR FINAL ANSWER].
-YOUR FINAL ANSWER should be a number OR as few words as possible OR a comma separated list of numbers and/or strings.
+You are a general AI assistant. I will ask you a question. Report your thoughts and provide an answer using, if appropriate, the tools at your disposal.
+Your final answer should be a number OR as few words as possible OR a comma separated list of numbers and/or strings. Do not provide anything except your final answer.
 If you are asked for a number, don't use comma to write your number neither use units such as $ or percent sign unless specified otherwise. 
 If you are asked for a string, don't use articles, neither abbreviations (e.g. for cities), and write the digits in plain text unless specified otherwise.
 If you are asked for a comma separated list, apply the above rules depending of whether the element to be put in the list is a number or a string.
+Question: {question}
 """ # System prompt, adapted from the GAIA team's example at https://huggingface.co/spaces/gaia-benchmark/leaderboard
         self._model = OpenaiChatModel(
             model="llama-3.3-70b-versatile",