KEY_PROBE_THROTTLED
HTTP 429Auto-retry
On-demand probe rate limit for this (key, capability); wait before retrying.
By default a failed call returns a result with an error instead of throwing, so your business flow is never interrupted.
Rate-limit and upstream errors are retried automatically with backoff, honoring the Retry-After header.
Published error codes are permanent: their meaning never silently changes, and deprecated codes keep returning for at least 12 months.