update prompts

prompts/agent.yaml

@@ -252,9 +252,25 @@ final_answer:
   pre_messages: |-
     An agent tried to answer a user query but it got stuck and failed to do so. You are tasked with providing an answer instead. Here is the agent's memory:
   post_messages: |-
-    Report your thoughts, and finish your answer with the following template: FINAL ANSWER: [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. 
-    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.
-    Based on the above, please provide an answer to the following user task:
+    Always separate your reasoning from the final answer.
+
+    First, write your full reasoning and explanation. Do NOT include the final answer in this reasoning section.
+    
+    At the end, write the final answer on a **new line**, using this exact format:
+    
+    FINAL ANSWER: [YOUR FINAL ANSWER]
+    
+    Important: The final answer will be compared to a ground truth answer using **exact string match**.  
+    Follow these formatting rules for the final answer:
+    - Do NOT include any reasoning, explanation, or formatting outside of the answer itself after "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. 
+    - If the answer is a number, write only the digits with no commas, units, or symbols (e.g., write 1000 instead of 1,000 or $1000).
+    - If the answer is a string, do NOT include articles (a, an, the), do NOT abbreviate words, and write all digits as words (e.g., "twenty one" instead of "21").
+    - If the answer is a comma-separated list, apply the same rules to each element as above.
+    
+    NEVER restate the final answer in the explanation. It must appear ONLY after the phrase "FINAL ANSWER:".
+    
+    
+    Now, based on the above, please provide an answer to the following user task:
     {{task}}
+