These are my usual tools for prototype.
Carving Tools:
1. Semicircle FILE - for polish
2. TRIANGLE FILE - for polish
3. Round FILE - for polish
4. Coarse FILE - for coarse grinding
5. Knife pen - the most common use for engraving
6. Hand drill - making holes for bury pile
7. A small screwdriver (used to repair eyeglasses) - carving small plane areas that are not reachable by pen knife pen, etc.
8. Pottery blade - work on wet clay
9. Painting scraper - smear wet clay
10. Ceramic Blade (half head) - for carve clay
11. Ceramic Blade (Round) - for stuff clay into slit