feat: support filter_hidden query param in trajectory endpoint

- Add filter_hidden query parameter support to /trajectory endpoint
- Add hidden property to Event class
- Add hidden to serialization keys for proper serialization/deserialization

openhands/events/event.py

@@ -107,3 +107,13 @@ def tool_call_metadata(self) -> ToolCallMetadata | None:
     @tool_call_metadata.setter
     def tool_call_metadata(self, value: ToolCallMetadata) -> None:
         self._tool_call_metadata = value
+
+    @property
+    def hidden(self) -> bool:
+        if hasattr(self, '_hidden'):
+            return self._hidden  # type: ignore[attr-defined]
+        return False
+
+    @hidden.setter
+    def hidden(self, value: bool) -> None:
+        self._hidden = value

openhands/events/serialization/event.py

@@ -20,8 +20,9 @@
     'action',
     'observation',
     'tool_call_metadata',
+    'hidden',
 ]
-UNDERSCORE_KEYS = ['id', 'timestamp', 'source', 'cause', 'tool_call_metadata']
+UNDERSCORE_KEYS = ['id', 'timestamp', 'source', 'cause', 'tool_call_metadata', 'hidden']
 
 DELETE_FROM_TRAJECTORY_EXTRAS = {
     'screenshot',

openhands/server/routes/trajectory.py

@@ -22,8 +22,13 @@ async def get_trajectory(request: Request):
         events.
     """
     try:
+        filter_hidden = True
+        if hasattr(request, 'query_params') and 'filter_hidden' in request.query_params:
+            filter_hidden = request.query_params['filter_hidden'].lower() == 'true'
+
         async_stream = AsyncEventStreamWrapper(
-            request.state.conversation.event_stream, filter_hidden=True
+            request.state.conversation.event_stream,
+            filter_hidden=filter_hidden,
         )
         trajectory = []
         async for event in async_stream: