# Cairo Storage Optimization

> Explain Starknet storage cost optimization, packing values, and bitwise operations; use when a request involves reducing storage slots or implementing packed storage in Cairo.

- Skill: `teddyjfpender/cairo-storage-optimization` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add teddyjfpender/cairo-storage-optimization`
- Raw SKILL.md: https://api.skillmd.com/api/skills/teddyjfpender/cairo-storage-optimization/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: teddyjfpender (https://skillmd.com/u/teddyjfpender)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/teddyjfpender/cairo-storage-optimization

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# Cairo Storage Optimization

## Overview
Show how to reduce storage costs by packing multiple values into one slot and manipulating bits safely.

## Quick Use
- Read `references/storage-optimization.md` before answering.
- Use shift and mask operations with `core::integer::bitwise` or arithmetic.
- Mention StorePacking for automatic packing where appropriate.

## Response Checklist
- Ensure packed values fit within 251 bits total.
- Use explicit masks and shifts for extraction.
- Consider a custom struct with StorePacking for reusable packing logic.

## Example Requests
- "How do I pack two u128 values into one storage slot?"
- "What is StorePacking in Cairo?"
- "How do I unpack a packed storage value?"