PromptArchitect MCP

/** * Logger utility for MCP server * Logs to stderr to keep stdout clean for MCP protocol */ export type LogLevel = 'debug' | 'info' | 'warn' | 'error'; const LOG_LEVELS: Record<LogLevel, number> = { debug: 0, info: 1, warn: 2, error: 3, }; let currentLevel: LogLevel = (process.env.LOG_LEVEL as LogLevel) || 'info'; export function setLogLevel(level: LogLevel): void { currentLevel = level; } function shouldLog(level: LogLevel): boolean { return LOG_LEVELS[level] >= LOG_LEVELS[currentLevel]; } function formatMessage(level: LogLevel, message: string, meta?: Record<string, unknown>): string { const timestamp = new Date().toISOString(); const metaStr = meta ? ` ${JSON.stringify(meta)}` : ''; return `[${timestamp}] [${level.toUpperCase()}] ${message}${metaStr}`; } export const logger = { debug(message: string, meta?: Record<string, unknown>): void { if (shouldLog('debug')) { console.error(formatMessage('debug', message, meta)); } }, info(message: string, meta?: Record<string, unknown>): void { if (shouldLog('info')) { console.error(formatMessage('info', message, meta)); } }, warn(message: string, meta?: Record<string, unknown>): void { if (shouldLog('warn')) { console.error(formatMessage('warn', message, meta)); } }, error(message: string, meta?: Record<string, unknown>): void { if (shouldLog('error')) { console.error(formatMessage('error', message, meta)); } }, }; export default logger;