What is smart-contract-auditor?

A guide to reviewing Ethereum smart contracts written in Solidity for security problems. It covers automated code checks, fuzzing, formal verification, upgradeable contracts, financial-application attacks, gas use, and audit reports.

Use it to audit Solidity contracts, investigate reentrancy and price-feed problems, check proxy and access-control safety, run security tests, and write findings.

It helps find bugs that could let attackers steal funds, bypass permissions, or break contract upgrades before deployment. It also keeps the review aligned with the project's actual compiler version.

smart-contract-auditor — Skill for Codex by san-npm/skills-ws

Install

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.

Any agent

npx skills add san-npm/skills-ws --skill smart-contract-auditor

Clone the repo

git clone --depth 1 https://github.com/san-npm/skills-ws

Made for: Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/san-npm/skills-ws/smart-contract-auditor/github.svg)](https://agentmods.dev/skills/san-npm/skills-ws/smart-contract-auditor)

Your own site

<a href="https://agentmods.dev/skills/san-npm/skills-ws/smart-contract-auditor"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/smart-contract-auditor/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/san-npm/skills-ws/smart-contract-auditor"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/smart-contract-auditor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 652 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00089	$0.00652
Opus 5.5	$0.00036	$0.00261
Sonnet 5.5	$0.00018	$0.00130
Haiku 4.5	$0.00009	$0.00065

Measured 2mo ago against content hash 55dc6e36977f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

smart-contract-auditor 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 2mo 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.

skills/smart-contract-auditor/SKILL.md · 35 lines

How it starts

The opening of the file, as written. The whole thing — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Smart Contract Auditor

Sibling skills: for entry-point enumeration use entry-point-analyzer; for differential PR review use differential-review; for property-based fuzzing depth see property-based-testing.

Pin the compiler to the project, never to this doc. Every --solv / symbolic-exec command below uses $SOLC as a placeholder. Read the real version from the project before running any tool:

# Foundry projects
SOLC=$(grep -E '^\s*solc(_version)?' foundry.toml | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' | head -1)
# Hardhat projects: check the `solidity:` block in hardhat.config.{js,ts}
# Fallback: read the pragma of the file under audit
SOLC=$(grep -oE 'pragma solidity[^;]*[0-9]+\.[0-9]+\.[0-9]+' src/Vault.sol | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' | tail -1)
echo "Auditing against solc $SOLC"

Safety gate

Before executing commands or changing external systems, confirm scope, credentials, target environment, rollback, and required approval. Pin and verify third-party artifacts; never expose secrets to client code or logs.

Reference guide

Read only the references needed for the current request:

1. Tooling Setup: references/1-tooling-setup.md
2. Vulnerability Checklist: references/2-vulnerability-checklist.md
3. Proxy / Upgrade Safety: references/3-proxy-upgrade-safety.md
4. DeFi-Specific Audit: references/4-defi-specific-audit.md
5. Gas Optimization Patterns: references/5-gas-optimization-patterns.md
6. Audit Report Template: references/6-audit-report-template.md
7. Tool Commands Reference: references/7-tool-commands-reference.md
8. Test Coverage & Fuzzing Strategy: references/8-test-coverage-fuzzing-strategy.md

Read the full file on GitHub · 35 lines

Files

What ships with it

9 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.

Changes

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.

2mo ago First seen · 35 lines · 89 tokens per session scan A 55dc6e36977f

Subscribe to this mod's changes

smart-contract-auditor is a skill published in the GitHub repository san-npm/skills-ws (4 stars, last pushed 1mo ago), licensed MIT. It adds 89 tokens to every session and 652 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-07.

Security Web3 and blockchain

smart-contract-auditor next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
smart-contract-auditorsan-npm/skills-ws	Skill	4	1mo ago	MIT	A	89	Codex
signature-replayPurpleAILAB/Decepticon	Skill	6.5k	8d ago	Apache-2.0	A	31	Claude Code, Codex
official-sui-skillsMystenLabs/sui	Skill	7.8k	yesterday	Apache-2.0	A	116	Claude Code, Codex
bridgealsk1992/CloddsBot	Skill	3.1k	1mo ago	MIT	A	13	Claude Code, Codex
onchainkitalsk1992/CloddsBot	Skill	3.1k	1mo ago	MIT	A	24	Claude Code, Codex
marginfialsk1992/CloddsBot	Skill	3.1k	1mo ago	MIT	A	11	Claude Code, Codex
devtools-event-clientTanStack/devtools	Skill	510	yesterday	MIT	A	79	Claude Code, Codex