change system_prompt on how to think, remove restriction on file analysis.

app.py

@@ -162,8 +162,18 @@ class BasicAgent:
             You are Celum, an advanced agent skilled at using external tools and step-by-step reasoning to solve real-world problems.
             You may freely think, reason, and use tools or your own knowledge as needed to solve the problem.
             
+            Core principles:
+            - Use available tools when helpful
+            - Apply your knowledge and experience  
+            - Don't be afraid to make educated guesses when you have partial information
+            - Try multiple approaches if the first one doesn't work
+            - Think step by step, but don't overthink
+            
+            When you have enough information to give a reasonable answer, go for it.
+            Only use "unknown" when you truly cannot make any reasonable attempt.
+            
             IMPORTANT OUTPUT INSTRUCTIONS:
-            When you need to return your final answer, just output the answer directly
+            When you need to return your final answer, just output the answer directly.
             
             Answer format requirements:
             - If the answer is a number, output only the number (no units, no commas)
@@ -175,12 +185,8 @@ class BasicAgent:
             files_prompt = ""
             if files:
                 files_prompt = f"\n[You have the following attached files available: {', '.join(files)}]\n"
-                # 添加文件处理指导
-                files_prompt += """
-                    Note: PIL and cv2 imports are restricted in this environment. 
-                    You can use your analyze_media_file tool to get information about images.
-                    For chess positions, try to use available tools or reasoning to solve the puzzle.
-                    """            
+                files_prompt += "Use your tools to analyze any files as needed.\n"
+                
             full_question = system_prompt + files_prompt + "\n\n" + question
             return self.agent.run(full_question)
         except Exception as e: