/**
 * Server logger passed to FastMCP.
 *
 * With the stdio transport, stdout carries JSON-RPC frames only, so nothing
 * here may write to stdout. FastMCP reports through `debug`/`info` in some
 * sessions (e.g. "[FastMCP debug] listRoots method not supported by client");
 * `console.debug`/`console.info` write to stdout in Node, so every level is
 * routed to stderr. Debug output is dropped unless DEBUG or DEBUG_MCP is set.
 */
type LogFn = (...args: unknown[]) => void;
export interface ServerLogger {
    debug: LogFn;
    error: LogFn;
    info: LogFn;
    log: LogFn;
    warn: LogFn;
}
export declare function createServerLogger(env?: Record<string, string | undefined>, write?: LogFn): ServerLogger;
export {};
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