Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add zaryab2000/decipher-gas-optimizoor --skill storage-layoutgit clone --depth 1 https://github.com/zaryab2000/decipher-gas-optimizoorWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/zaryab2000/decipher-gas-optimizoor/storage-layout)<a href="https://agentmods.dev/skills/zaryab2000/decipher-gas-optimizoor/storage-layout"><img src="https://agentmods.dev/badge/skills/zaryab2000/decipher-gas-optimizoor/storage-layout/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/zaryab2000/decipher-gas-optimizoor/storage-layout"><img src="https://agentmods.dev/badge/skills/zaryab2000/decipher-gas-optimizoor/storage-layout.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00130 | $0.02431 |
| Opus 5 | $0.00065 | $0.01215 |
| Sonnet 5 | $0.00026 | $0.00486 |
| Haiku 4.5 | $0.00013 | $0.00243 |
Grade A, and why
storage-layout scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Purpose
Identify storage slot inefficiencies in Solidity contracts and recommend layout changes that reduce SSTORE and SLOAD costs. Storage operations are the most expensive EVM instructions: a cold SSTORE costs 22,100 gas and a cold SLOAD costs 2,100 gas. Every eliminated slot and every avoided redundant storage access compounds across all callers for the life of the contract.
This skill covers 10 techniques (SL-001 through SL-010) derived from the gas optimization knowledge base. It does not invent new rules.
When to Use This Skill
- Writing or reviewing a
structdefinition with mixed-size fields - Reviewing state variable declarations at the contract level
- Auditing functions that read or write the same storage variable multiple times
- Reviewing reentrancy guards (check for SSTORE-based lock patterns)
- Reviewing flash-loan or callback patterns that use persistent storage flags
- Reviewing constructors that push static data into storage arrays
- Reviewing contracts that use arrays for key-based lookup instead of mappings
When NOT to Use This Skill
- Upgradeable contracts (proxy pattern): Never reorder existing state variables. Storage layout is immutable across upgrades. Only append at the end, using gaps.
- Frozen/deployed contracts: If the contract is already deployed and not upgradeable, storage layout cannot be changed. Report findings as informational only.
- Separately accessed fields: If struct fields are always read in separate transactions, packing into shared slots adds masking overhead without reducing SLOAD count.
- Chains without Cancun support: Do not recommend transient storage (SL-005, SL-006) on chains that do not yet support EIP-1153 (e.g., some L2s before their Cancun upgrade).
- Mutable large data: Do not recommend SSTORE2 (SL-007) for data that changes after deployment — bytecode is immutable.
Rationalizations to Reject
| Rationalization | Why It's Wrong | Required Action |
|---|---|---|
| "The struct looks fine as-is" | Unpacked slots cost 22,100 gas per write, silently | Run the packing check regardless of visual appearance |
| "It's only one extra slot" | At 10,000 tx/day, 1 extra slot = 221M gas/day wasted | Eliminate every eliminable slot |
| "I'll optimize later" | Storage layout cannot be changed after deployment without a migration | Fix during development, not after |
| "The compiler handles this" | Solidity packs within consecutive declarations only; cross-declaration gaps are not packed | Always verify with forge inspect |
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 236 lines · 130 tokens per session scan A 85dd177d8594
storage-layout is a skill published in the GitHub repository zaryab2000/decipher-gas-optimizoor (7 stars, last pushed 6mo ago), licensed MIT. It adds 130 tokens to every session and 2,431 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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