/**
 * Logging for a process that speaks JSON-RPC on stdout.
 *
 * Every message goes to stderr. Nothing in this project may ever call
 * console.log: a single stray line on stdout corrupts the MCP framing and the
 * client drops the session, which was the single most reported bug in 1.2.x.
 */
export type LogLevel = "debug" | "info" | "warn" | "error" | "silent";
export declare function setLogLevel(level: LogLevel): void;
export declare function getLogLevel(): LogLevel;
export interface Logger {
    debug(...args: unknown[]): void;
    info(...args: unknown[]): void;
    warn(...args: unknown[]): void;
    error(...args: unknown[]): void;
    child(scope: string): Logger;
}
export declare function createLogger(scope?: string): Logger;
export declare const logger: Logger;