Question 1

Which agents work with it?

Accepted Answer

Any agent that reads skills from a directory. Claude Code, Codex and Gemini CLI read it natively; Cursor and VS Code connect over MCP.

Question 2

Why is it free?

Accepted Answer

The voice runs on your own machine, so there is nothing to meter. The first run downloads it, about 340 MB.

Question 3

Is it open source?

Accepted Answer

Yes. The skill is MIT-licensed and the authoring format is public.

steffenfritz/mxcheck