diff --git a/tests/manual.py b/tests/manual.py
index a39802b..d59754c 100644
--- a/tests/manual.py
+++ b/tests/manual.py
@@ -2,33 +2,24 @@ import asyncio
 import traceback
 
 from lambda_agent_api.agent_api import AgentApi
-from lambda_agent_api.server import MsgEventTextChunk, MsgEventToolCallChunk, MsgEventToolResult
+from lambda_agent_api.server import MsgEventTextChunk
 
 
+def my_callback(message):
+    print(f"Callback: {message}")
+
 
 async def main():
-    api = AgentApi("agent-1", "ws://localhost:8000/agent_ws/")
+    api = AgentApi("agent-1", "ws://localhost:8000/agent_ws/", callback=my_callback)
 
     await api.connect()
     while True:
         try:
             prompt = await asyncio.get_event_loop().run_in_executor(None, input, ">>> ")
             print("Agent: ", end="")
-            is_tool = False
             async for chunk in api.send_message(prompt):
-                match chunk:
-                    case MsgEventTextChunk():
-                        is_tool = False
-                        print(chunk.text, end="", flush=True)
-                    case MsgEventToolCallChunk():
-                        if not is_tool:
-                            print(f"\n\n### TOOL CALL: ({chunk.tool_name}) ", end="", flush=True)
-                            is_tool = True
-                        print(chunk.args_chunk, end="", flush=True)
-                    case MsgEventToolResult():
-                        is_tool = False
-                        print(f"\nResult: {chunk.result}\n\n", end="", flush=True)
-
+                if isinstance(chunk, MsgEventTextChunk):
+                    print(chunk.text, end="", flush=True)
             print("\n")
         except KeyboardInterrupt:
             break