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 pencil20388-eng/browser-automation-skills --skill fingerprintinggit clone --depth 1 https://github.com/pencil20388-eng/browser-automation-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/pencil20388-eng/browser-automation-skills/fingerprinting)<a href="https://agentmods.dev/skills/pencil20388-eng/browser-automation-skills/fingerprinting"><img src="https://agentmods.dev/badge/skills/pencil20388-eng/browser-automation-skills/fingerprinting/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/pencil20388-eng/browser-automation-skills/fingerprinting"><img src="https://agentmods.dev/badge/skills/pencil20388-eng/browser-automation-skills/fingerprinting.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 | $0.00000 | $0.00962 |
| Opus 5 | $0.00000 | $0.00481 |
| Sonnet 5 | $0.00000 | $0.00192 |
| Haiku 4.5 | $0.00000 | $0.00096 |
Grade A, and why
fingerprinting 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 — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Fingerprinting Skill
Understand how websites identify browsers through fingerprinting, and how to manage fingerprint isolation for multi-account scenarios.
What is browser fingerprinting?
Websites collect dozens of browser attributes to create a unique "fingerprint" that identifies your browser across sessions — even without cookies. Key attributes include:
| Attribute | What it reveals | Uniqueness |
|---|---|---|
| User-Agent | OS, browser, version | Low |
| Screen resolution | Display size, pixel ratio | Medium |
| Canvas | GPU rendering differences | High |
| WebGL | Graphics card info, rendering | High |
| AudioContext | Audio processing fingerprint | High |
| Fonts | Installed system fonts | High |
| Timezone | Geographic region | Low |
| Language | Browser/OS language settings | Low |
| WebRTC | Real IP address (even behind VPN) | Critical |
| Hardware concurrency | CPU core count | Medium |
| Device memory | RAM amount | Medium |
| Platform | OS architecture | Low |
Check your fingerprint
# Open BrowserScan to see your fingerprint profile
# Works with Selenium or Playwright
driver.get("https://www.browserscan.net/")
# or
page.goto("https://www.browserscan.net/")
Other fingerprint checking sites:
- https://www.browserscan.net/
- https://browserleaks.com/
- https://amiunique.org/
- https://coveryourtracks.eff.org/
Canvas fingerprinting
Canvas fingerprinting draws invisible shapes on an HTML5 canvas and hashes the pixel data. Different GPUs and rendering engines produce different results.
// How sites detect canvas fingerprint (conceptual)
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
ctx.textBaseline = 'top';
ctx.font = '14px Arial';
ctx.fillText('fingerprint test', 2, 2);
const hash = canvas.toDataURL().hashCode();
To spoof: Antidetect browsers like AdsPower inject noise into canvas rendering so each profile produces a different hash.
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 · 126 lines · 0 tokens per session scan A 5b8355a44f3c
fingerprinting is a skill published in the GitHub repository pencil20388-eng/browser-automation-skills (4 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 962 tokens. 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 2026-08-31.
Other skills, from other repositories
mk:playwright-cli
Session-persistent browser automation via Playwright CLI — form filling, screenshots, data extraction, multi-step flows. Use when the user needs to navigate websites, interact with web pages, fill forms, take screenshots, test web applications, or extract information across multiple requests. NOT for AI-driven…
unicli
Comprehensive guide to Uni-CLI — the open Agent-Computer Interface runtime for real software. Trigger when the user needs to fetch data from websites (Twitter, Bilibili, HackerNews, GitHub, Reddit, Bloomberg, Zhihu, WeChat, and hundreds more); interact with news, finance, social, academic, shopping, or video…
unicli-smart-search
Route search queries to the best platform via unicli. Use when searching across websites, social media, tech forums, news, finance, shopping, or academic sources.
unicli-browser
Control broker-owned hidden, existing-Chrome, or remote browser targets with explicit Agent identity, visibility, profile partitions, and lifecycle.
unicli-operate
Compatibility guide for unicli operate. Prefer unicli browser, which now exposes the same operator surface plus broker/session diagnostics.
camofox-browser
Anti-detection browser automation for AI agents. Use when the user needs stealth web browsing, undetectable scraping, fingerprint spoofing, proxy rotation, or privacy-focused browser automation. Triggers include "stealth scrape", "anti-detection", "bypass fingerprinting", "camofox", "camoufox", "undetectable browser"…