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 joonlab/joonlab-claudecode-setting-for-share --skill browser-automationgit clone --depth 1 https://github.com/joonlab/joonlab-claudecode-setting-for-shareWrote 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/joonlab/joonlab-claudecode-setting-for-share/browser-automation)<a href="https://agentmods.dev/skills/joonlab/joonlab-claudecode-setting-for-share/browser-automation"><img src="https://agentmods.dev/badge/skills/joonlab/joonlab-claudecode-setting-for-share/browser-automation/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/joonlab/joonlab-claudecode-setting-for-share/browser-automation"><img src="https://agentmods.dev/badge/skills/joonlab/joonlab-claudecode-setting-for-share/browser-automation.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 | $0.00370 | $0.02123 |
| Opus 5 | $0.00185 | $0.01061 |
| Sonnet 5 | $0.00074 | $0.00425 |
| Haiku 4.5 | $0.00037 | $0.00212 |
Grade A, and why
browser-automation 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 9d 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 — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Automation
Two CLI backends drive real browsers. This skill picks the right one per task and gives verified commands for each. Both keep the user's logged-in sessions in their own persistent profiles, so both can operate authenticated sites (verified: Gmail inbox, X home, Google Calendar).
cmux browser— low-level, deterministic CLI. Each command is independent, fast (~1s), free (no LLM), and every surface is isolated → excellent for parallel fan-out and repeatable/scheduled workflows. Engine: WKWebView (no file downloads, no network capture).aside— a real AI browser. Two surfaces:aside repl(Playwright-compatible JS: snapshot / locator / download / dialog / PDF) andaside exec(an autonomous agent you delegate whole tasks to). Engine: full Playwright (downloads & dialogs work).execplans, has built-in web search, and works across logged-in apps — but costs tokens and is non-deterministic.
Choose the backend (decision matrix)
| Your need | Use | Why |
|---|---|---|
| Fast, deterministic read/scrape of public site(s) | cmux | ~1s/cmd, free, reproducible |
| Many sites at once (parallel fan-out) | cmux | each surface is isolated — no contention |
| Repeatable / scheduled logged-in workflow (cron, daily) | cmux | free + deterministic + session persists |
| Fill/submit forms, click flows, screenshots | cmux (or aside repl) | both do this well |
| Download / upload a file | aside repl | cmux (WKWebView) cannot download |
| Native JS dialog (alert/confirm/prompt) | aside repl | page.on('dialog', …); cmux needs an override hack |
| Save a PDF of a page | aside repl | page.pdf({ path }) |
| Delegate a fuzzy multi-step task ("just do X on the web") | aside exec | autonomous agent plans & acts |
| Cross-app logged-in work (read Gmail → create Calendar event) | aside exec | cookies + internal app APIs |
| Precise, reproducible verification / evidence capture | cmux or aside repl | scriptable, deterministic |
| Network interception / request capture | neither reliably | cmux = WKWebView unsupported; aside route untested |
What ships with it
2 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.
- 9d ago First seen · 124 lines · 370 tokens per session scan A b9f8d14aadf9
browser-automation is a skill published in the GitHub repository joonlab/joonlab-claudecode-setting-for-share (10 stars, last pushed 1mo ago), licensed MIT. It adds 370 tokens to every session and 2,123 once invoked, about $0.0019 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 2026-08-31.
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