type Level = 'debug' | 'info' | 'warn' | 'error';
export interface LogFields {
    event: string;
    level?: Level;
    sessionId?: string | null;
    port?: number;
    pid?: number;
    requestId?: string;
    runId?: string;
    outcome?: string;
    durationMs?: number;
    errorClass?: string;
    retryCount?: number;
    pidAlive?: boolean;
    detail?: string;
    [k: string]: unknown;
}
/** Emit one structured event. Best-effort; never throws. */
export declare function rlog(fields: LogFields): void;
/** The engineer-grade log file path for this MCP process (for surfacing to the user). */
export declare function rlogPath(): string | null;
export {};