import type { LogLevel } from "./config.js";
export interface Logger {
    debug(msg: string, meta?: Record<string, unknown>): void;
    info(msg: string, meta?: Record<string, unknown>): void;
    warn(msg: string, meta?: Record<string, unknown>): void;
    error(msg: string, meta?: Record<string, unknown>): void;
}
/**
 * Minimal level-gated logger. Writes to **stderr** only — stdout is reserved for
 * the MCP JSON-RPC stream. Callers must never pass spec content, API keys, JWTs,
 * or request bodies as `msg`/`meta`; this logger does not attempt to parse specs
 * out of arbitrary strings, so the discipline lives at the call sites.
 */
export declare function createLogger(level?: LogLevel): Logger;