export interface HookDiagnosticEvent {
    event?: string;
    invocationId?: string;
    timestamp?: string;
    client?: string;
    hookEvent?: string;
    outcome?: string;
    reason?: string;
    durationMs?: number;
    [key: string]: unknown;
}
export declare function hookDiagnosticDirectory(): string;
export declare function readHookDiagnosticEvents(limit?: number, sinceMs?: number, includeLifecycle?: boolean): HookDiagnosticEvent[];
export declare function summarizeHookDiagnostics(sinceMs?: number): Record<string, unknown>;
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