Learning Design from Mature Coding Agents (7): Provider Retry Policy — From One 5xx to Bounded Retry and Fallback
Intermittent NVIDIA NIM 500s exposed Rivumi's early gap: classified errors with no retry consumer. SDK retries are now disabled; the harness gives each candidate up to five attempts with jittered exponential backoff and capped Retry-After handling, then can move to an explicitly configured fallback model. Both model.retry and model.fallback enter the event log.