Huge refactoring

agent.py

@@ -1,7 +1,17 @@
+from dataclasses import dataclass
+from typing import Literal
+
 import httpx2
 from openai import OpenAI
 
-from utils import AgentMessage
+
+@dataclass
+class AgentMessage:
+    content: str
+    """Content of the message"""
+
+    role: Literal["system", "assistant", "user"]
+    """Who sent the message"""
 
 class Agent:
     """Perform operations with timeline events using OpenAI-compatible API"""