Just Works

Definitions

A simpler shorthand for saying a tool or system behaves with satisfying reliability and low friction. In engineering slang, people love the phrase because truly reliable boring tools are rarer than flashy ones.
In plain English: Works smoothly and reliably without much hassle.
Example: "The internal secrets helper was beloved because it just works, even on the worst mornings when everything else in the environment seems to be arguing with reality."