The Multi-tool is both your weapon and the most basic mining tool. The Multi-tool you start with has 5 slots for upgrades, with 2 of them taken by mining beam. Inventory slots are a valuable commodity in No Man's Sky. The only way to get extra slots on your Multi-tool, though, is to exchange it for a. For No Man's Sky on the PlayStation 4, a GameFAQs message board topic titled " Multi tool slot increase".