Stale usage statistic in the AfterModelCallEvent

[almyazin]

Problem

As a Strands Agent SDK user I'd like to have usage statistic for current execution loop via event.agent.event_loop_metrics.latest_agent_invocation property.

But according to the current implementation, the hook is invoked before the statistic is updated:
hook invocation:

sdk-python/src/strands/event_loop/event_loop.py

Lines 346 to 355 in e7d3eb9

	after_model_call_event = AfterModelCallEvent(
	agent=agent,
	invocation_state=invocation_state,
	stop_response=AfterModelCallEvent.ModelStopResponse(
	stop_reason=stop_reason,
	message=message,
	),
	)
	await agent.hooks.invoke_callbacks_async(after_model_call_event)

usage update:

sdk-python/src/strands/event_loop/event_loop.py

Lines 412 to 414 in e7d3eb9

	# Update metrics
	agent.event_loop_metrics.update_usage(usage)
	agent.event_loop_metrics.update_metrics(metrics)

Question

Is there a way to access used tokens count of the current loop from the callback?