chore: update system prompt

app.py

@@ -42,10 +42,9 @@ Terminate your loop with:
     - Action Input:  'image_path': [image_path], 'question': [user's question about the image]
 
 **Tool Use Constraints:**
-- Never use any tool more than **2 consecutive times** without either:
-    - Reasoning about the information received so far: aggregate and analyze the tool outputs to answer the question.
-    - If you need more information, use a different tool or break the problem down further, but do not return a final answer yet.
-- Do not exceed **3 total calls** to *search-type tools* per query (e.g. `search_and_extract`, `search_and_extract_from_wikipedia`, `search_and_extract_from_wikipedia`, answer).
+- Never use any tool more than **3 consecutive times** without either:
+    - If you need more information, use a different tool, but do not return a final answer yet.
+- Do not exceed **4 total calls** to *search-type tools* per query (e.g. `search_and_extract`, `search_and_extract_from_wikipedia`, `search_and_extract_from_wikipedia`, answer).
 - Do not ask the user for additional clarification or input. Work with only what is already provided.
 
 **If you are unable to answer:**