CNPC: Dangerous Script Extension

The extension gives scripts in the native CustomNPCs scripting environment access to a set of methods that act on the player's game window: one shakes the window, one rapidly hides and shows it to create a flashing effect, and one resizes it. Each method takes the player as a parameter, so a script can target a specific player on the map. The functions work directly inside CNPC scripts once the mod is installed, with no separate setup.

The mod depends on CustomNPCs Unofficial 1.20.1, which must be installed on the server and every player, and it is built on Java.type imports. Its stated purpose is to provide system-level operations that CNPC scripts cannot otherwise perform. The author notes that some features are potentially risky: the mod involves methods that resemble malware, and it is strongly recommended to grant scripting permissions only to people trusted in CustomNPCs Unofficial. The original purpose of a restriction in the base mod was to stop misuse by importing system classes to create external shell scripts, and this extension runs shell operations, which pose security risks.

The mod is published for Forge only, across six game versions 1.20.1 – 1.20.6, and it is licensed as All rights reserved, so it is not open source. It runs on the client and the server, so both need it. The latest Forge file is 1.0.5 for 1.20.1, dated 2026-05-23.