feat(hooks): add TypedEvent

Author: Ratish1

src/strands/agent/agent.py

@@ -56,7 +56,14 @@
 from ..tools.registry import ToolRegistry
 from ..tools.structured_output._structured_output_context import StructuredOutputContext
 from ..tools.watcher import ToolWatcher
-from ..types._events import AgentResultEvent, InitEventLoopEvent, ModelStreamChunkEvent, ToolInterruptEvent, TypedEvent
+from ..types._events import (
+    AgentResultEvent,
+    EventLoopStopEvent,
+    InitEventLoopEvent,
+    ModelStreamChunkEvent,
+    ToolInterruptEvent,
+    TypedEvent,
+)
 from ..types.agent import AgentInput
 from ..types.content import ContentBlock, Message, Messages, SystemContentBlock
 from ..types.exceptions import ContextWindowOverflowException
@@ -763,7 +770,7 @@ async def _run_loop(
                 yield event
 
             # Capture the result from the final event if available
-            if hasattr(event, "__getitem__") and "stop" in event:
+            if isinstance(event, EventLoopStopEvent):
                 agent_result = AgentResult(*event["stop"])
 
         finally: