Removed cruft

tools/persona_tool.py

@@ -1,11 +1,13 @@
+import os
 import openai
 import json
 from tools.base_tool import BaseTool
 
 class PersonaTool(BaseTool):
-    def __init__(self, api_key: str):
+    def __init__(self):
         super().__init__()
-        openai.api_key = api_key
+        
+        self.api_key = os.environ.get("OPENAI_API_KEY")
 
     def generate_response(self, persona_description: str, query: str) -> str:
         """