Individual skill
storage-layout
EVM storage layout expertise for struct packing, proxy storage patterns, and collision avoidance. Use when designing data structures, working with upgradeable proxies, optimizing storage costs, or debugging storage-related issues.
skills/storage-layout/SKILL.md
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# Storage Layout
## EVM Storage Fundamentals
Each storage slot is 32 bytes (256 bits). State variables are assigned slots sequentially starting at slot 0. Multiple variables smaller than 32 bytes are packed into a single slot when possible.
```solidity
// Slot 0: addr (20 bytes) + isActive (1 byte) + role (1 byte) = 22 bytes — fits one slot
// Slot 1: balance (32 bytes) — full slot
// Slot 2: lastUpdate (8 bytes) — new slot (won't pack with previous full slot)
contract Packed {
address addr; // 20 bytes | slot 0
bool isActive; // 1 byte | slot 0
uint8 role; // 1 byte | slot 0