Function isRetryableStatusCode

pkg/modelerrors/modelerrors.go:332–345

isRetryableStatusCode determines if an HTTP status code is retryable. Retryable means we should retry the SAME model with exponential backoff. Retryable status codes: - 5xx (server errors): 500, 502, 503, 504 - 529 (Anthropic overloaded) - 408 (request timeout) Non-retryable status codes (skip to

(statusCode int)

// - 429 (rate limit) - provider is explicitly telling us to back off
// - 4xx client errors (400, 401, 403, 404) - won't get better with retry
func isRetryableStatusCode(statusCode int) bool {
	switch statusCode {
	case 500, 502, 503, 504: // Server errors
		return true
	case 529: // Anthropic overloaded
		return true
	case 408: // Request timeout
		return true
	case 429: // Rate limit - NOT retryable, skip to next model
		return false
	default:
		return false
	}
}

// transientStatusCodePatterns contains error message substrings that indicate
// a transient failure even when the HTTP status code would otherwise classify