/**
 * Shared request guards for AI providers.
 */
export declare class RateLimiter {
    private tokens;
    private lastRefill;
    private readonly maxTokens;
    private readonly refillRate;
    constructor(maxTokens?: number, refillRate?: number);
    acquire(): Promise<void>;
    private refill;
}
export declare class CircuitBreaker {
    private failures;
    private lastFailureTime;
    private state;
    private readonly threshold;
    private readonly resetTimeout;
    execute<T>(fn: () => Promise<T>): Promise<T | null>;
    getState(): string;
}
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