export interface Logger {
info(message: string, ...args: any[]): void;
error(message: string, ...args: any[]): void;
warn(message: string, ...args: any[]): void;
debug(message: string, ...args: any[]): void;
}
class ConsoleLogger implements Logger {
private shouldLog(level: string): boolean {
const levels = ['error', 'warn', 'info', 'debug'];
const currentLogLevel = process.env.LOG_LEVEL || 'info';
const currentLevelIndex = levels.indexOf(currentLogLevel);
const messageLogLevelIndex = levels.indexOf(level);
return messageLogLevelIndex <= currentLevelIndex;
}
info(message: string, ...args: any[]): void {
if (this.shouldLog('info')) {
// MCP servers use stdio for JSON-RPC, so log to stderr
console.error(`[INFO] ${message}`, ...args);
}
}
error(message: string, ...args: any[]): void {
if (this.shouldLog('error')) {
console.error(`[ERROR] ${message}`, ...args);
}
}
warn(message: string, ...args: any[]): void {
if (this.shouldLog('warn')) {
console.error(`[WARN] ${message}`, ...args);
}
}
debug(message: string, ...args: any[]): void {
if (this.shouldLog('debug')) {
console.error(`[DEBUG] ${message}`, ...args);
}
}
}
export const logger = new ConsoleLogger();
