Function scope_session_key 

pub async fn scope_session_key<F>(
    session_key: Option<String>,
    future: F,
) -> F::Output
where
    F: Future,

Run a future with the session key in task-local storage and log attribution. The scope wraps the entire agent turn, so all tools invoked during the turn (including nested calls) see the same session key. SessionsCurrentTool reads this to identify the active session.