Under the hood
Claude Code's internal async response tracker now records when each response was settled, not just its value
What
Claude Code has an internal store used to match up asynchronous responses from the server with the code waiting on them. That store now records a settledAt timestamp for each entry alongside the value it resolves to, with a new accessor to look up that timestamp.
Why
This is internal bookkeeping; recording when a response was settled makes it possible to reason about timing (such as staleness or latency) for these async exchanges, though the finding doesn't show a specific new consumer of that timestamp.