They must do, surely? I've been vibe coding my own harness, in particular for use with Ox Alpha. The 429 downtime when Ox Alpha was at the height of popularity quickly gave me a refresher crash course on backoff strategies, like adding jitter to the backoff. At least the major harnesses must have exponential backoff & jitter?

You did this when you ran into an issue with a third party. The developers building this tool, throwing them at their own APIs are significantly less likely to run into a similar issue that may inspire similar action.