export interface McpDiagnosticEvent {
    schemaVersion: 2;
    timestamp: string;
    service: 'token-optimizer';
    serviceVersion: string;
    event: string;
    outcome?: 'success' | 'failure';
    processId: number;
    client?: string | null;
    clientVersion?: string | null;
    toolName?: string;
    toolCount?: number;
    durationMs?: number;
    error?: {
        name: string;
        message: string;
    } | null;
    [key: string]: unknown;
}
export declare function recordMcpDiagnostic(event: Omit<McpDiagnosticEvent, 'schemaVersion' | 'timestamp' | 'service' | 'processId' | 'error'> & {
    error?: unknown;
}): void;
export declare function readMcpDiagnosticEvents(limit?: number, sinceMs?: number): McpDiagnosticEvent[];
export declare function summarizeMcpDiagnostics(sinceMs?: number): Record<string, unknown>;
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