export declare enum FailoverReason {
    AUTH = "auth",
    AUTH_PERMANENT = "auth_permanent",
    BILLING = "billing",
    RATE_LIMIT = "rate_limit",
    OVERLOADED = "overloaded",
    SERVER_ERROR = "server_error",
    TIMEOUT = "timeout",
    CONTEXT_OVERFLOW = "context_overflow",
    PAYLOAD_TOO_LARGE = "payload_too_large",
    MODEL_NOT_FOUND = "model_not_found",
    PROVIDER_POLICY_BLOCKED = "provider_policy_blocked",
    FORMAT_ERROR = "format_error",
    THINKING_SIGNATURE = "thinking_signature",
    LONG_CONTEXT_TIER = "long_context_tier",
    UNKNOWN = "unknown"
}
export interface ClassifiedError {
    reason: FailoverReason;
    statusCode?: number;
    provider?: string;
    model?: string;
    message: string;
    retryable: boolean;
    shouldCompress: boolean;
    shouldRotateCredential: boolean;
    shouldFallback: boolean;
}
export declare function classifyApiError(error: unknown, provider?: string, model?: string, approxTokens?: number, contextLength?: number): ClassifiedError;
export declare function formatUserFriendlyError(classified: ClassifiedError): string;
export declare function extractRetryDelaySeconds(message: string): number | null;
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