export type Provider = 'anthropic' | 'openai' | 'google';
export declare class AuthError extends Error {
    provider: Provider;
    constructor(provider: Provider, message: string);
}
export declare class APIError extends Error {
    provider: Provider;
    statusCode: number;
    retryable: boolean;
    retryAfterMs?: number | undefined;
    constructor(provider: Provider, statusCode: number, message: string, retryable?: boolean, retryAfterMs?: number | undefined);
}
export declare class ToolError extends Error {
    toolName: string;
    constructor(toolName: string, message: string);
}
export declare class BudgetExceededError extends Error {
    budgetUsd: number;
    spentUsd: number;
    constructor(budgetUsd: number, spentUsd: number);
}
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