Yeah, I use Slime in vim to drive programs (like psql) via their stdin/stdout, so an "agent" that does stdin/stdout only for UI is perfect.

If I ever write my own agent, it will be in this fashion.

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[1] I have a `scratchpad.sql` file filled with whatever sql snippets I am testing and have `psql mydbname` in a vertical split. Doing C-c C-c in the scratchpad sends the paragraph to the psql instance.