What is input-arithmetic-safety?

A plugin for checking smart-contract inputs and arithmetic. It looks for missing zero checks, precision and rounding errors, unsafe integer conversions, vault share inflation attacks, dust amounts, and risky unchecked Solidity code.

Use it when auditing contracts that accept user parameters or perform financial calculations, especially vault, staking, and token logic.

It helps identify calculation and validation bugs that can cause incorrect balances, prices, fees, or token distributions.

input-arithmetic-safety — Plugin for Claude Code by quillai-network

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.

Clone the repo

git clone --depth 1 https://github.com/quillai-network/quillshield_skills

Made for: Claude Code.

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/plugins/quillai-network/quillshield_skills/input-arithmetic-safety/github.svg)](https://agentmods.dev/plugins/quillai-network/quillshield_skills/input-arithmetic-safety)

Your own site

<a href="https://agentmods.dev/plugins/quillai-network/quillshield_skills/input-arithmetic-safety"><img src="https://agentmods.dev/badge/plugins/quillai-network/quillshield_skills/input-arithmetic-safety/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/plugins/quillai-network/quillshield_skills/input-arithmetic-safety"><img src="https://agentmods.dev/badge/plugins/quillai-network/quillshield_skills/input-arithmetic-safety.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 1 skill cost 95 tokens a session between them.

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.

Security

Grade A, and why

input-arithmetic-safety 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.

plugins/input-arithmetic-safety/.claude-plugin/plugin.json · 10 lines

What it actually says

{
  "name": "input-arithmetic-safety",
  "version": "1.0.0",
  "description": "Detects input validation failures and arithmetic vulnerabilities in smart contracts — the #1 direct exploitation cause at 34.6% of cases. Covers missing zero-checks, precision loss from division-before-multiplication, rounding direction exploitation, ERC4626 inflation attacks, unsafe casting, dust amount exploitation, and Solidity 0.8+ edge cases in unchecked blocks.",
  "author": {
    "name": "QuillShield",
    "url": "https://github.com/quillai-network"
  }
}

Contents

What it installs

The manifest is a name and a version. 1 skill travel with it, and installing the plugin installs all of them — 95 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Skill input-arithmetic-safety A 95 tokens

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 · 10 lines scan A 25a21ac156ce

Subscribe to this mod's changes

input-arithmetic-safety is a plugin published in the GitHub repository quillai-network/quillshield_skills (134 stars, last pushed 7mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-30.

Security Web3 and blockchain claude-plugin defi-security skills solidity-audit

input-arithmetic-safety next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
input-arithmetic-safetyquillai-network/quillshield_skills	Plugin	134	7mo ago	MIT	A	—	Claude Code
aomiaomi-labs/skills	Plugin	8	8d ago	MIT	A	—	Claude Code
yield-xyz-agentkit-builderstakekit/agentkit	Plugin	4	9d ago	MIT	A	—	Claude Code
yield-xyz-agentkit-moonpaystakekit/agentkit	Plugin	4	9d ago	MIT	A	—	Claude Code
yield-xyz-agentkit-privystakekit/agentkit	Plugin	4	9d ago	MIT	A	—	Claude Code
radius-devradiustechsystems/skills	Plugin	2	1mo ago	MIT	A	—	Claude Code
coinpaprikacoinpaprika/claude-marketplace	Plugin	9	22d ago	none	A	—	Claude Code