Every single feature of an "agent" they have described is just...generic software development. Writing loops. if/else statements to branch execution paths. Waiting on input. Spawning child processes and communicating with them. Running CPU-bound operations (like parsing).

So every discussion about the "best" programming language is really you telling the world about your favorite language.

Use Go. Use Python. Use JavaScript. Use whatever the hell else you want. They are all good enough for the job. If you are held back it won't be because of the language itself.