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Devin FoleyandClaude Opus 5.5
32b3648758
A workspace snapshot upload sends up to eight file-backed parts at once. The SDK never retries a part because its body is a stream, so a part that received 503 SlowDown had only the uploader's three fixed-delay attempts (0.5 s and 1 s). Under a request-rate limit the save failed and the run failed in setup. A rate-limited part now retries with exponential full-jitter backoff (up to eight attempts, at most 20 s per wait), and the upload halves the parts it admits, once per round of throttled requests. Other part failures keep the existing three attempts. Tests cover a real-client SlowDown recovery, the single halving, the attempt bound, cancellation during a wait, and the backoff schedule through its ceiling. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>