What
When an artifact upload gets rejected with a 429 error ("too many requests"), the server can include a retry-after header telling Claude Code how long to wait before trying again. Previously, Claude Code always retried, capping that wait at 30000 milliseconds even if the server asked for longer. Now, a new helper only returns the server's suggested delay if it's under a set threshold; if the server asks for a longer wait, Claude Code gives up and returns immediately instead of retrying.
Why
This avoids Claude Code sitting around retrying an upload when the server has signaled it needs a long cooldown, failing faster instead of blocking on a lengthy wait.
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The exact threshold value and what happens after the immediate return (e.g. whether the upload is reported as failed) aren't stated.