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 personamanagmentlayer/pcl --skill browser-automation-expertgit clone --depth 1 https://github.com/personamanagmentlayer/pclWrote 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/personamanagmentlayer/pcl/browser-automation-expert)<a href="https://agentmods.dev/skills/personamanagmentlayer/pcl/browser-automation-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/browser-automation-expert/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/personamanagmentlayer/pcl/browser-automation-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/browser-automation-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00094 | $0.02562 |
| Opus 5 | $0.00047 | $0.01281 |
| Sonnet 5 | $0.00019 | $0.00512 |
| Haiku 4.5 | $0.00009 | $0.00256 |
Grade A, and why
browser-automation-expert 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 7d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
import asyncio, urllib.robotparser How it starts
The opening of the file, as written. The whole thing — 309 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Automation Expert
Driving a browser to obtain data or complete a flow that has no API. Distinct
from playwright-expert, which covers browsers as a testing tool against your
own application; this skill covers browsers as a client against someone else's.
Before Automating: Is It Allowed?
Automation of a third-party site is a legal and ethical question before it is a technical one. Check, and record the answer:
- Is there an API? Use it. It is faster, more stable and unambiguously permitted.
- Terms of service — automated access is often restricted. Read them.
robots.txt— not legally binding everywhere, but ignoring it is a deliberate act you should be able to justify.- Personal data — scraping triggers GDPR obligations regardless of the data being public. There must be a lawful basis, and data subjects have rights over what you collected.
- Copyright and database rights — publicly readable is not freely reusable.
- Load — your throughput is someone else's cost.
If the answer to any of these is unclear, escalate rather than proceeding. This skill will not help evade access controls, defeat CAPTCHAs on a site that has refused you, or scrape behind an authentication wall you are not entitled to cross.
Core Concepts
Choose the Lightest Tool
| Need | Tool |
|---|---|
| Static HTML | httpx + selectolax/BeautifulSoup — no browser |
| Data present in a JSON endpoint the page calls | Call that endpoint directly |
| JavaScript-rendered content | Headless browser |
| Interaction: login, upload, multi-step flow | Headless browser |
Open the network tab before writing a scraper. Most "JavaScript-heavy" sites fetch their data from a JSON endpoint you can call directly — a hundred times cheaper and far more stable than driving a browser.
What ships with it
1 file 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.
- 7d ago First seen · 309 lines · 94 tokens per session scan A 0c6ec35da545
browser-automation-expert is a skill published in the GitHub repository personamanagmentlayer/pcl (40 stars, last pushed 2d ago), licensed Apache-2.0. It adds 94 tokens to every session and 2,562 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.
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