export declare function getPoolSize(): number;
export declare function getPoolLabels(): string[];
export declare function nextAvailableKey(): Promise<{
    key: string;
    label: string;
} | undefined>;
export declare function markKeyRateLimited(key: string, durationMs?: number): void;
export declare function fetchGeminiWithPool(buildUrl: (key: string) => string, init: RequestInit, options?: {
    maxAttempts?: number;
    onRetry?: (label: string, status: number) => void;
    fetcher?: typeof fetch;
    /**
     * Explicit API key to use instead of the process.env-backed round-robin
     * pool. When set (non-empty), the global pool is bypassed entirely: every
     * attempt uses this key and no cooldown bookkeeping is applied. This lets a
     * library caller inject a key resolved from its own env (e.g. a backend's
     * `input.env`) without mutating process.env. Falls back to the pool when
     * absent.
     */
    keyOverride?: string;
}): Promise<Response>;
export declare function _resetPoolForTests(): void;
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