Function classifyByStatus

packages/providers/src/retry.ts:61–85

(status: number, err: unknown, wire?: WireApi)

]);

function classifyByStatus(status: number, err: unknown, wire?: WireApi): RetryDecision | undefined {
  if (status === 429) {
    const retryAfterMs = extractRetryAfterMs(err);
    const decision: RetryDecision = { retry: true, reason: 'rate-limited (429)' };
    if (retryAfterMs !== undefined) decision.retryAfterMs = retryAfterMs;
    return decision;
  }
  if (status >= 500 && status <= 599) {
    // Third-party Anthropic relays (sub2api, claude2api, anyrouter…) often
    // return 5xx + "not implemented" for POST /v1/messages even though their
    // /v1/models endpoint works. Retrying wastes 3 rounds of exponential
    // backoff on an endpoint that will never respond; short-circuit so the
    // user sees the actionable error immediately. Only applies to
    // anthropic-wire endpoints — OpenAI/Google wires can emit the same text
    // for unrelated reasons and should retry normally.
    if (wire === 'anthropic' && looksLikeGatewayMissingMessagesApi(err)) {
      return { retry: false, reason: 'gateway does not implement Messages API' };
    }
    return { retry: true, reason: `server error (${status})` };
  }
  if (status >= 400 && status <= 499) {
    return { retry: false, reason: `client error (${status})` };
  }
  return undefined;
}

function normalizeErrorText(errorMessage: string): string {
  let out = '';