world-of-claudecraft: Skill for Claude Code

.claude/skills/release-malware-audit/SKILL.md

release-malware-audit is a skill for Claude Code from levy-street/world-of-claudecraft. It costs 119 tokens per session (1,437 once invoked), scanned A, original, MIT.

A release check for deliberately planted malicious code, such as crypto miners, secret theft, backdoors, remote code execution, and risky install hooks.

In plain words
What is it for?
Use it to scan the whole World of ClaudeCraft working tree before a release or when checking the supply chain.
Why use it?
It helps identify harmful code before a project is tagged or shipped, while distinguishing suspicious matches from legitimate code.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions AGENTS.md.

This is levy-street/world-of-claudecraft's own configuration. It tells Claude Code how to work on world-of-claudecraft itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything world-of-claudecraft configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is mkdir -p tmp && node scripts/malware_scan.mjs --json --quiet > tmp/malware_scan.json.

About the project

World of ClaudeCraft is a browser-based classic-style multiplayer online game with a persistent shared world that can also run locally or be controlled through a Python reinforcement-learning interface. Players can quest and raid in the online world, while developers can host it themselves and train AI agents to play. The catalogue skills, agents, instructions, hooks, and setting support workflows for interacting with and developing the game.

levy-street/world-of-claudecraft · 2,251 stars · on GitHub · worldofclaudecraft.com

Reuse

Borrowing it

Nothing to install: this file belongs to levy-street/world-of-claudecraft. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/levy-street/world-of-claudecraft/main/.claude/skills/release-malware-audit/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/levy-street/world-of-claudecraft

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.

agentmods badge for release-malware-audit

README.md
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Your own site
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Your own site · 80×15
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Per session 119 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,437 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00119 $0.01437
Opus 5 $0.00060 $0.00718
Sonnet 5 $0.00024 $0.00287
Haiku 4.5 $0.00012 $0.00144

Measured 13d ago against content hash b2dd6ffd6397, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

release-malware-audit 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 13d 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

knows this repo's legitimate patterns (the `$WOC` crypto-wallet, `child_process` in build
.claude/skills/release-malware-audit/SKILL.md · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Release malware audit: whole-tree check for planted malicious code

This is a release gate. Its one job is to answer: does this tree contain code that was deliberately written to harm users, operators, or the supply chain? Crypto miners, data/secret exfiltration, backdoors and auth bypasses, RCE/obfuscation, web3 wallet-drain / key theft (the class that would steal a user's $WOC), prompt-injection planted in the agent/skill instruction files, and package.json install hooks or risky dependencies. It does NOT look for accidental security bugs - that is privacy-security-review's job - and it never modifies code. A human acts on a BLOCK.

The work is split so each half does what it is good at:

  • scripts/malware_scan.mjs is a deterministic, high-recall FLAGGER. It greps a curated signature catalog and emits structured findings. It is deliberately noisy: a regex hit is a question, not a verdict.
  • The release-malware-audit agent is the JUDGE. It reads the flagged code in context, knows this repo's legitimate patterns (the $WOC crypto-wallet, child_process in build scripts, real auth comparisons), and decides real-vs-false-positive.

Steps

  1. Run the scanner over the whole tree:

    mkdir -p tmp && node scripts/malware_scan.mjs --json --quiet > tmp/malware_scan.json
    

    It exits non-zero whenever there are findings (expected; most are false positives). Note totalFindings and the per-category counts. A scan-failure exit (2) means fix the run before trusting any result - never report PASS off a scan that did not complete.

    npm run security:scan is the same human-readable flagger. CI and npm run security:gate run --gate, which exits non-zero only on a HIGH-severity finding that survives the path-aware priors (tests/malware_scan.test.ts asserts the tree is HIGH-clean, so a planted signature breaks npm test). This skill is the deeper, agent-judged pass on top of that.

  2. Triage by fanning out the agent. Group the findings by category. Dispatch the read-only release-malware-audit agent, one invocation per category that has findings (categories are independent, so run them in parallel in a single message). Give each agent its category's findings (or point it at tmp/malware_scan.json and the category) and have it read the flagged files and return confirmed-vs-dismissed for that category. For a small number of total findings, a single agent invocation over all of them is fine.

Read the full file on GitHub · 92 lines

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.

  1. 13d ago First seen · 92 lines · 119 tokens per session scan A b2dd6ffd6397

Subscribe to this mod's changes

release-malware-audit is a skill published in the GitHub repository levy-street/world-of-claudecraft (2,251 stars, last pushed yesterday), licensed MIT. It adds 119 tokens to every session and 1,437 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.