> Pretty much any choice of tech stack will work well.

No, it won't.

I just tested gcloud (brand new install, modern "cli" version, not the old "sdk" version, although the "sdk" version was every bit as bad).

With a warm cache:

    $ time gcloud &>/dev/null
    
    real 0m1.215s
    user 0m0.954s
    sys 0m0.243s

It doesn't get faster if I give it a valid action instead of just getting the overview help screen. This is so slow that a remote LLM can get bored!

A CLI should be snappy. A CLI targeted at agents should be even snappier. We're note talking about massive throughput here -- we're talking about the latency added to a tool call for the mere fact that the tool call invokes the CLI. Google should be targeting two orders of magnitude of improvement here