How to append events (state_delta) to a deployed agent?

[alekzan]

I have a deployed agent in Vertex AI. I can access to it with

remote_app = agent_engines.get(RESOURCE_NAME)

If I want to create a session, I do it like this:

session_service = remote_app.create_session(user_id=f"u_{uuid.uuid4().hex[:8]}")

And usually if I want to add something to the state through my backend I pass the new state as EventAction like this:

# 1. Assign the keys to update in the state:
delta    = {key_to_update: new_key_value}

# 2. Pass them as Event
event = Event(
    invocation_id=str(uuid.uuid4()),
    author="system",                 # or the agent’s name
    actions=EventActions(state_delta=delta),
    timestamp=time.time(),           # optional but good practice
)

# 3. Append the event to your state
session_service.append_event(session=end_session, event=event)

But the append_event method doesn't seem to be available when the Agent is deployed.

Any idea on how to inject new values to the state of a session in a deployed agent?