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 vladmdgolam/agent-skills --skill reverse-engineer-jsgit clone --depth 1 https://github.com/vladmdgolam/agent-skillsWrote 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/vladmdgolam/agent-skills/reverse-engineer-js)<a href="https://agentmods.dev/skills/vladmdgolam/agent-skills/reverse-engineer-js"><img src="https://agentmods.dev/badge/skills/vladmdgolam/agent-skills/reverse-engineer-js/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/vladmdgolam/agent-skills/reverse-engineer-js"><img src="https://agentmods.dev/badge/skills/vladmdgolam/agent-skills/reverse-engineer-js.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 16 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Excessive Agency · line 26 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
- high Excessive Agency · line 35 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
- high Excessive Agency · line 50 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
- high Excessive Agency · line 120 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
- high Tool Misuse · line 161 Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
- medium MCP Rug Pull · line 26 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 35 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 38 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 50 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 77 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 92 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 105 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 120 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 149 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 103 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 121 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00146 | $0.02261 |
| Opus 5 | $0.00073 | $0.01130 |
| Sonnet 5 | $0.00029 | $0.00452 |
| Haiku 4.5 | $0.00015 | $0.00226 |
Grade A, and why
reverse-engineer-js 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 yesterday.
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 — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Reverse Engineer JS
LLM-assisted deobfuscation of minified / mangled JavaScript using humanifyjs plus surrounding tooling for extracting and reintegrating modules.
Tools at a glance
| Tool | Purpose | When |
|---|---|---|
humanifyjs (npx) |
Rename mangled vars/functions via LLM | Mangled but already valid JS |
prettier / js-beautify |
Reformat single-line minified code | Before humanify, if needed |
webcrack |
Unpack webpack / browserify bundles into per-module files | When bundle is one big file |
| Source-map sleuthing | // # sourceMappingURL=... may exist next to the bundle |
Always check first — beats LLM rename |
Always check for a sourcemap (bundle.js.map or sourceMappingURL comment in the file) before spending tokens on humanify. If found, original sources are recoverable for free.
Default humanify invocation
Use Gemini unless the user says otherwise:
npx humanifyjs gemini -m "gemini-3.8-flash" -o <outputDir> <inputFile>
Requires GEMINI_API_KEY in env (the project's root .env is the usual place).
Other backends:
# OpenAI
npx humanifyjs openai --apiKey="$OPENAI_API_KEY" --model gpt-4.1-mini bundle.js
# Local (slower, free)
npx humanifyjs local bundle.js
Critical gotchas
1. Pseudo-TTY required in non-interactive shells
humanify calls process.stdout.cursorTo(...) for its progress bar. In Claude Code / CI / piped contexts, stdout is not a TTY and the call crashes with TypeError: process.stdout.cursorTo is not a function.
Wrap the call in script -q /dev/null:
script -q /dev/null npx humanifyjs gemini -m "gemini-3.8-flash" -o "$OUT" "$IN"
(macOS/BSD script syntax. On Linux: script -qc "<cmd>" /dev/null.)
2. Output filename is fixed
humanify always writes its result as <outputDir>/deobfuscated.js regardless of input filename. Don't expect module_1234.js in → module_1234.js out.
3. Long files = long runs
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.
- yesterday Changed · -2 tokens per session 79ccb6dc681e
- 10d ago First seen · 162 lines · 148 tokens per session scan A 1519783c3fe2
reverse-engineer-js is a skill published in the GitHub repository vladmdgolam/agent-skills (8 stars, last pushed yesterday), licensed MIT. It adds 146 tokens to every session and 2,261 once invoked, about $0.0007 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 2026-08-30.
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