code2mcp

/** * Structured logging utility * * CRITICAL: All logs must go to stderr, NEVER stdout * stdout is reserved for MCP JSON-RPC protocol */ import winston from 'winston'; const logLevel = process.env.LOG_LEVEL || 'info'; export const logger = winston.createLogger({ level: logLevel, format: winston.format.combine( winston.format.timestamp(), winston.format.errors({ stack: true }), winston.format.json() ), transports: [ new winston.transports.Console({ stderrLevels: ['error', 'warn', 'info', 'debug'], consoleWarnLevels: [], }), ], }); /** * Log to stderr only (safe for MCP protocol) */ export function logError(message: string, meta?: any): void { logger.error(message, meta); } export function logInfo(message: string, meta?: any): void { logger.info(message, meta); } export function logDebug(message: string, meta?: any): void { logger.debug(message, meta); } export function logWarn(message: string, meta?: any): void { logger.warn(message, meta); }