Update app.py

app.py

@@ -62,14 +62,14 @@ def respond_to_input(user_input: str) -> str:
             "  1) web_search(query:str)\n"
             "  2) parse_excel(path:str,sheet_name:str)\n"
             "  3) ocr_image(path:str)\n\n"
-            "⚠️ **IMPORTANT** ⚠️: If (and only if) you need to call a tool, output exactly one\n"
-            "JSON object (no extra text). For example:\n"
+            "⚠️ **MANDATORY** ⚠️: If (and only if) you need to call a tool, your entire response MUST be exactly ONE JSON OBJECT and NOTHING ELSE.  \n"
+            "For example, if you want to call web_search, you must respond with exactly:\n"
             "```json\n"
-            '{"tool":"web_search","query":"Mercedes Sosa albums 2000-2009"}\n'
+            "{\"tool\":\"web_search\",\"query\":\"Mercedes Sosa studio albums 2000-2009\"}\n"
             "```\n"
-            "That JSON must start at the very first character of your response and end at the last\n"
-            "character—no quotes, no code fences, and no explanation.\n\n"
-            "If you do NOT need any tool, simply reply with your final answer as plain text."
+            "That JSON string must start at the very first character of your response and end at the very last character—"
+            "no surrounding quotes, no markdown fences, no explanatory text.  \n\n"
+            "If you do NOT need to call any tool, then you must respond with your final answer as plain text (no JSON)."
         )
     )