Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/Liberty91LTD/cti-skillsnpx agentmods add skills/liberty91ltd/cti-skills/lookup-virustotalWrote 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/liberty91ltd/cti-skills/lookup-virustotal)<a href="https://agentmods.dev/skills/liberty91ltd/cti-skills/lookup-virustotal"><img src="https://agentmods.dev/badge/skills/liberty91ltd/cti-skills/lookup-virustotal/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/liberty91ltd/cti-skills/lookup-virustotal"><img src="https://agentmods.dev/badge/skills/liberty91ltd/cti-skills/lookup-virustotal.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00087 | $0.01378 |
| Opus 5 | $0.00044 | $0.00689 |
| Sonnet 5 | $0.00017 | $0.00276 |
| Haiku 4.5 | $0.00009 | $0.00138 |
Grade A, and why
lookup-virustotal 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.
lookup-virustotal
Queries VirusTotal API v3 for reputation data on IPs, domains, file hashes, and URLs. Retrieval only — do not interpret, assess, or conclude. The invoking skill or agent reasons about the result.
When to invoke
- User asks to check an IP, domain, hash, or URL against VirusTotal
- Investigation skill needs reputation context for a collected indicator
- IOC enrichment pipeline is deduplicating + scoring a batch
How to invoke
Two CLIs are provided. Pick by capability needed:
Basic lookup — Node CLI (zero deps)
node tools/clis/virustotal.js <type> <value>
# where <type> is one of: ip, domain, hash, url
Hits the basic object endpoint only and distils to a verdict. Best for fast retrieval inside an investigation chain.
Full surface — Python CLI (stdlib only)
python3 tools/clis/virustotal.py file <hash> [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py ip <ip> [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py domain <domain> [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py url <url> [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py submit-url <url>
python3 tools/clis/virustotal.py comments <type> <id>
python3 tools/clis/virustotal.py search <query> # Intel — premium
Stdlib only — no install, no venv.
Capabilities the Node CLI doesn't have:
- Relationship traversal — the killer feature for pivoting. For an IP, fetch
communicating_files,downloaded_files,resolutions,urls,related_threat_actors,historical_whois. For a file:contacted_ips,contacted_domains,dropped_files,similar_files,behaviours. For a domain:subdomains,siblings,resolutions. For a URL:contacted_ips,contacted_domains,last_serving_ip_address. Each--relationshipsentry is a separate API request — be deliberate about which to pull. - URL submission (
submit-url) — push a URL into the analysis queue; returns an analysis ID. - Comments — community comments on any object.
- Intel search — VT Intelligence query language (
type:peexe size:1mb+ p:5+). Premium endpoint; will 403 on free.
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.
- 12d ago First seen · 116 lines · 87 tokens per session scan A cf9bee2b5c47
lookup-virustotal is a skill published in the GitHub repository Liberty91LTD/cti-skills (18 stars, last pushed 1mo ago), licensed MIT. It adds 87 tokens to every session and 1,378 once invoked, about $0.0004 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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