The biggest danger is not the client itself but . A malicious version of Tuff Client could contain keyloggers, steal your browser cookies, or use your computer to mine cryptocurrency. Always scan the HTML file with a tool like VirusTotal before running it.
Unlike the standard Eaglercraft launcher, the Tuff Client bundles dozens of cheats and enhancements directly into the game menu. It is primarily used on anarchy servers, kitpvp arenas, and survival servers where rules are loose or nonexistent. tuff client eaglercraft link