endpoint.session() forwards to start_endpoint_session, which is async
def — so the call returns a coroutine, not a Session, despite the
SDK's return-type annotation. Use 'async with await endpoint.session(...)'
so the coroutine resolves to a Session before entering the context.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Rob Ballantyne
d51f04a176