Comment by jmcodes

I don't maintain this anymore but I experimented with this a while back: https://github.com/jx-codes/lootbox

Essentially you give the agent a way to run code that calls MCP servers, then it can use them like any other API.

Nowadays small bash/bun scripts and an MCP gateway proxy gets me the same exact thing.

So yeah at some level you do have to build out your own custom functionality.