Update app.py

app.py

@@ -374,14 +374,15 @@ def summarise_tool(query: str) -> str:
         
 def _calc_tool(query: str) -> str:
     import math
+    import re
     try:
-        # ✅ 優先處理純算式（只有數字與符號）
+        # 處理純算式（只有數字與符號）
         if re.fullmatch(r"[0-9\.\+\-\*/%\^\(\)\s]+", query.strip()):
             cleaned = query.strip().replace("^", "**")
             result = ne.evaluate(cleaned)
             return f"The result is: {result}"
 
-        # ✅ 對有 sin/cos/log/sqrt 的輸入，自動加 radians 並用 eval 處理
+        # 有 sin/cos/log 等字詞，自動套 math + radians
         expr = query.lower()
         expr = re.sub(r'sin\(([^)]+)\)', r'sin(math.radians(\1))', expr)
         expr = re.sub(r'cos\(([^)]+)\)', r'cos(math.radians(\1))', expr)
@@ -396,12 +397,15 @@ def _calc_tool(query: str) -> str:
         return f"The result is: {result}"
     
     except Exception:
-        # ✅ fallback：若 eval 也無法處理，交給 GPT 幫忙自然語言理解與回覆
         try:
-            response = llm_gpt4.invoke(query)
-            return response.content if isinstance(response, AIMessage) else response
+            # ✅ fallback 給 GPT，自然語言清楚回答（避免亂符號）
+            response = llm_gpt4.invoke(f"Please calculate this and explain briefly in plain English: {query}. Avoid math symbols like $ or \\n or \\(.")
+            result = response.content if isinstance(response, AIMessage) else response
+            result = re.sub(r"\\\[.*?\\\]", "", result)  # 清除 \[...\]
+            result = re.sub(r"\\\(.*?\\\)", "", result)  # 清除 \(...\)
+            return result.strip()
         except Exception as e:
-            return f"Natural language math error: {e}"
+            return f"Natural language fallback error: {e}"
         
 @tool("python_calc")
 def python_calc_tool(query: str) -> str:
@@ -499,7 +503,7 @@ router_task = Task(
 Based on the user's query, decide which agent or tool is best suited to handle it:
 - If the query is related to the content of an uploaded file (e.g., 'what is this document about?'), send it to the **Document QA Agent**.
 - If the query contains words like 'summarize', 'summary', or 'main points', use the **Summarizer Agent**.
-- If the query involves any kind of math, calculation, percentage, angle, log, sqrt, cos, sin, arithmetic expressions, or includes phrases like "how much", "calculate", "what is X + Y", send it to the **Math Agent**.
+- If the query involves any kind of math, calculation, percentage, angle, log, sqrt, cos, sin, arithmetic expressions, or includes phrases like "how much", "calculate", "what is X + Y", "x^2 + y^2", send it to the **Math Agent**.
 - If the user uploaded a CSV file and asks about table content, data trends, or uses words like 'data', 'table', 'csv', 'column', or 'row', send it to the **CSV Agent**.
 - If the user asks about current events, trending topics, or online information (e.g., 'What is LangChain?', 'latest news'), send it to the **Search Agent**.
 - If the query is about current date, time, or day of week (e.g., 'what is today\\'s date?', 'what time is it?', 'what day is it?'), send it to the **Search Agent** instead of the General Agent.