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Well, SaaS don't do CLIs for extension APIs.

Plus the performance issues to restarting processes all the time.

Neither of those things are true?

Also you are seriously comparing process startup time with the latency of a network call, or worse an llm call?

Yes, if the SaaS application needs to fork subprocesses for every little step of agentic workflows.

Welcome to CGIs, a great 1990's technology for Web applications.

We do that, and the cost of forking the cli vs the llm or network call is very small. It works really well.