A little nit here, bash isn't the most elegant language, but shell languages have a very nice feature that makes them easier for Agents to write: they're executed left to right, in the same order the tokens are generated. Python/Javascript can execute out of token order (e.g. foo(bar(baz(bak(bat))))), which is more error prone. Additionally, shell is very terse and designed for duct-taping things together.

I think something like nushell is probably a better direction than trying to use python/javascript as a shell.