What sqlmc is

sqlmc is SQL Multicast without a window. It is not a reimplementation: every verb is a thin adapter — parse arguments, make one call into the shared operations layer, render the answer. The desktop app's editor, this command line, and the MCP server all call that same layer.

That is the rule worth carrying into everything below: what the app refuses, sqlmc refuses, for the same reason and with the same wording behind it. A guardrail present in one face and absent in another is worse than no guardrail, because it teaches people to trust the wrong thing.