export interface ApprovalRequest {
    id: string;
    timestamp: number;
    duckName: string;
    mcpServer: string;
    toolName: string;
    arguments: Record<string, unknown>;
    status: 'pending' | 'approved' | 'denied' | 'expired' | 'consumed';
    approvedBy?: string;
    deniedReason?: string;
    expiresAt: number;
}
export type ApprovalStatus = 'pending' | 'approved' | 'denied' | 'expired' | 'consumed';
export declare class ApprovalService {
    private pendingApprovals;
    private approvalTimeout;
    private cleanupInterval;
    private approvedToolsForSession;
    constructor(approvalTimeoutSeconds?: number);
    createApprovalRequest(duckName: string, mcpServer: string, toolName: string, args: Record<string, unknown>): ApprovalRequest;
    getApprovalRequest(id: string): ApprovalRequest | undefined;
    getApprovalStatus(id: string): ApprovalStatus | undefined;
    approveRequest(id: string, approvedBy?: string): boolean;
    /**
     * Consume an approved request, transitioning it to the terminal `consumed`
     * status. Single-use: returns true only on a valid approved→consumed
     * transition; returns false if the request is missing or not in the
     * `approved` state (e.g. already consumed).
     */
    consumeApproval(id: string): boolean;
    denyRequest(id: string, reason?: string): boolean;
    getPendingApprovals(): ApprovalRequest[];
    getAllApprovals(): ApprovalRequest[];
    getApprovalsByDuck(duckName: string): ApprovalRequest[];
    cleanupExpired(): number;
    private startCleanupTimer;
    shutdown(): void;
    private createSessionKey;
    isToolApprovedForSession(principal: string, mcpServer: string, toolName: string, args: Record<string, unknown>): boolean;
    markToolAsApprovedForSession(principal: string, mcpServer: string, toolName: string, args: Record<string, unknown>): void;
    clearSessionApprovals(): void;
    getSessionApprovals(): string[];
    getStats(): {
        total: number;
        pending: number;
        approved: number;
        denied: number;
        expired: number;
        consumed: number;
    };
}
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