Individual skill
library-patterns
Library design patterns for reusable Solidity code. Use when creating shared utilities, math libraries, or type-safe operations. Covers internal vs external libraries, using-for, deployment patterns, and common math libraries.
skills/library-patterns/SKILL.md
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# Library Patterns
## Internal vs External Libraries
| Feature | Internal (embedded) | External (deployed) |
|---------|-------------------|-------------------|
| Deployment | Inlined into calling contract | Deployed separately, linked |
| Call type | JUMP (cheap) | DELEGATECALL (expensive) |
| State access | Reads caller's storage | Reads caller's storage via delegatecall |
| Gas cost | Lower per call | Higher per call, lower deploy if shared |
| Use case | Small utilities, math | Large shared code across many contracts |
```solidity
// Internal library — inlined at compile time