/**
 * Structured logging to stderr.
 * MCP protocol requires stdout for JSON-RPC only — all logs go to stderr.
 *
 * @module logger
 */
export type LogLevel = "debug" | "info" | "warn" | "error";
/** Set minimum log level. Messages below this level are suppressed. */
export declare function setLogLevel(level: LogLevel): void;
/** Get current log level. */
export declare function getLogLevel(): LogLevel;
/**
 * Write a structured log entry to stderr.
 * Format: JSON with timestamp, level, message, and optional data.
 */
export declare function log(level: LogLevel, msg: string, data?: Record<string, unknown>): void;
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