from Hacker News

RunJS is an MCP server written in C# that let's an LLM generate and execute JavaScript "safely".

It uses the excellent Jint library (https://github.com/sebastienros/jint) which is a .NET JavaScript interpreter that provides a sandboxed runtime for arbitrary JavaScript.

Using Jint also allows for extensibility by allowing JS modules to be loaded as well as providing interop with .NET object instances.