A release-safety reviewer for smart-contract projects, which are applications running on a blockchain. It checks whether deployment and upgrades are supported safely by the repository’s code, scripts, automation, configuration, and operating procedures.

Use it before deploying contracts, preparing an upgrade, reviewing deployment scripts, hardening CI/CD pipelines, changing administrator roles, or checking ownership handoff.

It helps find risks in the process that publishes or upgrades contracts, such as unsafe automation, mismatched configuration, or poorly protected signing keys. It is not a full security audit or an economic analysis.

defender — Skill 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.

Any agent

npx skills add quillai-network/quillshield_skills --skill defender

Clone the repo

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

Made for: Claude Code.

Or install defender, the plugin that ships this one along with the rest of its 1 skill.

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/quillai-network/quillshield_skills/defender/github.svg)](https://agentmods.dev/skills/quillai-network/quillshield_skills/defender)

Your own site

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

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,611 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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	$0.00050	$0.01611
Opus 5	$0.00025	$0.00805
Sonnet 5	$0.00010	$0.00322
Haiku 4.5	$0.00005	$0.00161

Measured 10d ago against content hash a79d6c18f10d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

defender scanned grade A with 1 finding 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 10d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- curl/bash installs

plugins/defender/skills/defender/SKILL.md · 413 lines

How it starts

The opening of the file, as written. The whole thing — 413 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Defender

A blue-team release-gate skill for smart contract systems.

Defender determines whether a repository is safe to deploy or upgrade. It focuses on release execution risk, not exploit discovery.

Use when

deploying smart contracts
preparing upgrades
reviewing deploy scripts
hardening CI/CD
rotating admin roles
validating ownership handoff
enforcing release hygiene

Non-goals

Defender does NOT replace:

full security audits
economic analysis
invariant discovery
deep proxy vulnerability analysis (proxy-upgrade-safety)

It focuses only on execution safety of release.

Core rule

Evidence first.

Only report findings from:

contracts
deploy scripts
CI workflows
dependency manifests
configs / address books
tests / fork scripts
docs / runbooks

Separate:

Detection → what repo proves
Policy → what should be enforced

Execution order (STRICT)

Project classification
Defence pass
Severity scoring
Release verdict

Reference packs

Always load:

references/finding-catalog.md
references/severity-model.md
references/evidence-query-playbook.md

Load contextually:

classification → project-classification.md
CI → ci-supply-chain.md
deploy drift → config-drift-checks.md
upgrade → upgrade-readiness.md
signer → signer-opsec.md
false confidence → false-confidence.md
post-deploy → post-deploy-validation.md

Templates:

defender-report-template.md
checklist templates as needed

Phase 1 — Project classification

Framework

Detect:

Foundry / Hardhat / hybrid / other

Evidence:

foundry.toml, hardhat.config.*, scripts

Language

Solidity / Vyper / Cairo / mixed

Upgradeability

upgradeable / immutable / mixed

Evidence:

OZ upgrade imports
proxies
initializer usage

Protocol type

Infer:

token / vault / AMM / lending / bridge / governance / NFT / staking / other

Deployment surface

manual / script / CI / multisig / upgrade-task

Read the full file on GitHub · 413 lines

Files

What ships with it

22 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.

10d ago First seen · 413 lines · 50 tokens per session scan A a79d6c18f10d

Subscribe to this mod's changes

defender is a skill published in the GitHub repository quillai-network/quillshield_skills (121 stars, last pushed 5mo ago), licensed MIT. It adds 50 tokens to every session and 1,611 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). 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

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