export interface CircuitBreakerEntry {
    consecutiveFailures: number;
    lastFailureAt: number;
    lastExitCode: number | null;
    lastExitTail: string;
    open: boolean;
    openedAt: number;
    lastProbeAt: number;
}
export declare class CircuitBreaker {
    #private;
    constructor(opts?: {
        threshold?: number;
        cooldownMs?: number;
        maxKeys?: number;
        staleMs?: number;
    });
    static key(agentId: string, ticketId: string, role: string): string;
    static isTransientExit(code: number | null): boolean;
    record(key: string, exitCode: number | null, tailSnippet?: string, opts?: {
        forceOpen?: boolean;
    }): {
        justOpened: boolean;
        entry: CircuitBreakerEntry;
    };
    shouldBlock(key: string): string | null;
    reset(key: string): void;
    recordSuccess(key: string): void;
    resetAgent(agentId: string): void;
    sweep(now?: number): number;
    getOpenBreakers(): Array<{
        key: string;
        entry: CircuitBreakerEntry;
    }>;
    get size(): number;
}