Update agent.py

agent.py

@@ -34,7 +34,8 @@ def search_arxiv(query: str) -> str:
         ])
     return {"arxiv_results": formatted_search_docs}
 
-from tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception
+from
+ tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception
 import requests
 
 
@@ -111,7 +112,8 @@ class SpeechToTextTool(Tool):
 class ExcelReaderTool(Tool):
     name = "excel_reader"
     description = """
-    Reads and returns a pandas DataFrame from an Excel file (.xlsx, .xls).
+    Reads an Excel file (.xlsx, .xls) and returns its content as a CSV string.
+    Use pandas.read_csv(StringIO(data)) to parse the output into a DataFrame.
     """
     inputs = {
         "excel_path": {
@@ -124,9 +126,9 @@ class ExcelReaderTool(Tool):
             "nullable": True
         }
     }
-    output_type = "pandas.DataFrame"
+    output_type = "string"
     
-    def forward(self, excel_path: str, sheet_name: str = None) -> pd.DataFrame:
+    def forward(self, excel_path: str, sheet_name: str = None) -> str:
         try:
             if not os.path.exists(excel_path):
                 return f"Error: Excel file not found at {excel_path}"
@@ -134,10 +136,11 @@ class ExcelReaderTool(Tool):
                 df = pd.read_excel(excel_path, sheet_name=sheet_name)
             else:
                 df = pd.read_excel(excel_path)
-            return df
+            return df.to_csv(index=False)
         except Exception as e:
             return f"Error reading Excel file: {str(e)}"
 
+
 class PythonCodeReaderTool(Tool):
     name = "read_python_code"
     description = "Reads a Python (.py) file and returns its content as a string."