If you're playing the newest snapshot, you're probably confused with the new anvil. Luckily, I made a quick guide on how it works. Here's my guide:

Job | Works?

Rename | Yes

Repair | Yes

Combine | Yes

Repair & | Yes
Combine

Repair/ | Not always
Combine
and rename

All Three | No

From here on out, "tool" means tool, weapon, or armor.

Target(no enchants) Xp needed

Any Tool, Rename | 15

Any Normal Item | 5 each item, max 6 at a time

Any Tool, Repair/Combine | 17

Any, Rename and
Combine/Repair | 32

For enchanted tools, the level varies depending on enchants.

I will make a download of a chart soon, so be ready.
Thanks for reading,
-G