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 saifyxpro/HeadlessX --skill cligit clone --depth 1 https://github.com/saifyxpro/HeadlessXWrote 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/saifyxpro/headlessx/cli)<a href="https://agentmods.dev/skills/saifyxpro/headlessx/cli"><img src="https://agentmods.dev/badge/skills/saifyxpro/headlessx/cli/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/saifyxpro/headlessx/cli"><img src="https://agentmods.dev/badge/skills/saifyxpro/headlessx/cli.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 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 System Prompt Leakage · line 13 Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.
- high System Prompt Leakage · line 61 Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.
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 | $0.00181 | $0.00820 |
| Opus 5.5 | $0.00072 | $0.00328 |
| Sonnet 5.5 | $0.00036 | $0.00164 |
| Haiku 4.5 | $0.00018 | $0.00082 |
Grade A, and why
cli 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 1mo 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
4 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.
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.
- 1mo ago First seen · 116 lines · 181 tokens per session scan A c72a70448086
cli is a skill published in the GitHub repository saifyxpro/HeadlessX (2,332 stars, last pushed 4d ago), with no licence file. It adds 181 tokens to every session and 820 once invoked, about $0.0007 per session on Opus 5.5. 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.
Other skills, from other repositories
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browser-automation-expert
Drive a real browser to navigate, extract data and complete flows on sites without an API: scraping, crawling, authentication, dynamic content and anti-bot handling. Use when the user mentions web scraping, crawling, browser automation, Puppeteer or headless Chrome, wants data pulled from a website, needs a login or…
browser-gateway
Real browser for web pages, from the terminal. Use when WebFetch fails (403, 402, 429, captcha, empty or JavaScript-only page), when a page needs a login, or when the user wants a screenshot of a website. Opens pages, reads them as markdown, clicks and types, on local Chrome or any cloud browser provider routed…
unbrowser
Cheap first-pass web discovery without launching Chrome — fetch SSR pages, run bounded JS, find routes/forms/API endpoints, extract structured data, and detect bot-wall or browser-only escalation points.
kasm-browser
Drive a persistent interactive browser via Chrome DevTools Protocol (KASM Chrome).
browser-screenshot
Capture a screenshot of a URL using a headless Chromium service (Browserless).