Toolbox plugins

I couldn't find anything similar in the documentation. Are there any CLI plugins for Toolbox? For example, I have a script called `./my-plugin` that somehow extends Toolbox functionality. Can I make the script callable as `toolbox my-plugin`?

Sorry for my bad English

The issue names no files, tests, or entry points. Start by clarifying whether Toolbox should support executable plugins and what discovery and invocation rules are required. Done is a documented decision or a concrete implementation scope, including how ./my-plugin would be invoked.

Written by the indexing model from the issue text.