Should you expect designers to know your brand style from the start?

If you hire a designer, should they instantly get your brand style or is it your job to guide them?

I’ve seen people expect designers to just “get it” right away, but in reality, your brand style isn’t always clear unless you explain it. Fonts, colors, tone, and vibe, these all need direction unless you’ve already built a strong brand guide.

Curious how others handle this. Do you send references or brand docs? Or do you let the designer figure it out over time?