modified process_attachment

app.py

@@ -4,6 +4,7 @@ import requests
 import tempfile
 import mimetypes
 import base64
+import json
 import pandas as pd
 import datetime
 from langchain.tools import tool
@@ -270,14 +271,19 @@ def python_executor(code: str) -> str:
 
 # --- TOOL 15: Attachment Processing Tool ---
 @tool
-def process_attachment(file_bytes: bytes, filename: str) -> str:
+def process_attachment(input_str: str) -> str:
     """
-    Processes an input attachment (audio, image, or video) and returns extracted text or a summary suitable for LLM input.
-    - For audio: transcribes to text using Whisper.
-    - For image: encodes as base64 and returns a prompt for LLMs that support image input.
-    - For video: extracts audio, transcribes, and returns the transcript.
-    - For unsupported types: returns an error message.
+    Processes an input attachment (audio, image, or video) and returns extracted text or a summary suitable for LLM input. 
+    This function accepts a JSON string with keys: 'file_bytes' (base64), and 'filename'. For unsupported file types the function returns an error message.
     """
+
+    try:
+        data = json.loads(input_str)
+        file_bytes = base64.b64decode(data["file_bytes"])
+        filename = data["filename"]
+    except Exception as e:
+        return f"error: {e}"
+    
     # Detect file type
     mime_type, _ = mimetypes.guess_type(filename)
     if not mime_type: