/**
 * Logger — pino to stderr.
 *
 * MCP protocol uses stdout for JSON-RPC messages. Logs MUST go to stderr or
 * they corrupt the protocol stream. See MCP transport specification.
 *
 * Default level: `warn`. Override with the `LOG_LEVEL` env var (one of:
 * `trace`, `debug`, `info`, `warn`, `error`, `fatal`, `silent`). Example:
 *   LOG_LEVEL=debug npx tsx src/server.ts
 */
import pino from "pino";
export declare const logger: pino.Logger<never, boolean>;
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