prompt change

gemini_agent.py

@@ -554,7 +554,7 @@ Focus on:
 TOOLS:
 ------
 You have access to the following tools:"""
-
+# Tightened format instructions: when giving a final answer, output exactly one line with the answer.
         FORMAT_INSTRUCTIONS = """To use a tool, use the following format:
 
 Thought: Do I need to use a tool? Yes
@@ -562,7 +562,7 @@ Action: the action to take, should be one of [{tool_names}]
 Action Input: the input to the action
 Observation: the result of the action
 
-When you have a response to say to the Human, or if you do not need to use a tool, you MUST use the format:
+When you have the final answer, you MUST use exactly one line with this format (no extra text, no lists):
 
 Thought: Do I need to use a tool? No
 Final Answer: [your response here]