Fix: Add post_messages template for final_answer

prompts.yaml

@@ -194,6 +194,13 @@ prompt_templates:
       2. Directly addresses the original question
       3. Based on the information gathered
       4. Uses the final_answer tool correctly
+    post_messages: |-
+      You have submitted your final answer. The answer should now be complete and ready for evaluation.
+      Remember that your answer should be:
+      1. Based on the information you gathered
+      2. Directly addressing the original question
+      3. Clear and well-structured
+      4. Using the final_answer tool correctly
 
   planning:
     initial_facts: |-