It checks—
It sendsabout a dozen small requests
Your keysent only to this endpoint, never stored
It takesunder a minute, usually

Read the small print.

A gateway can serve the right model and still strip it down: no tool calling, a JSON mode that returns prose, an output cap that is ignored. Spec check sends a handful of small requests and writes down which promises are kept. What each test does.

§1Who to ask
AThe endpoint
BThe model

Some promises depend on the model, not the gateway. A model that cannot call tools will fail that test on any host, so read the result next to what the model's maker says it supports.

§2Run