Is reservations required for 5 adults?

I have not been in a little while but to be safe I would get one.

Vagabond does not take reservations for tables of less than 10. Below 10 and its first come first serve.

I agree, it gets pretty busy

Vagabond only takes reservations for parties of 10 or more, rest is first come first serve.

Reservations are a good idea but be warned it doesn't mean that your food will get out in a timely manner

Not "required" per se, but required if you want to guarantee a table.

No but it helps.