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 agentmods add skills/web-infra-dev/midscene-skills/browsernpx skills add web-infra-dev/midscene-skills --skill browsergit clone --depth 1 https://github.com/web-infra-dev/midscene-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/web-infra-dev/midscene-skills/browser)<a href="https://agentmods.dev/skills/web-infra-dev/midscene-skills/browser"><img src="https://agentmods.dev/badge/skills/web-infra-dev/midscene-skills/browser.svg" alt="Measured on agentmods" 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 | $0.00191 | $0.05936 |
| Opus 5 | $0.00096 | $0.02968 |
| Sonnet 5 | $0.00038 | $0.01187 |
| Haiku 4.5 | $0.00019 | $0.00594 |
Grade A, and why
browser-automation 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 5d 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.
curl -s --max-time 2 -o /dev/null -w "%{http_code}" -H "Upgrade: websocket" -H "Connection: Upgrade" -H "Sec-WebSocket-Version: 13" -H "Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==" http://127.0.0.1:9222/devtools/browser How it starts
The opening of the file, as written. The whole thing — 411 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Automation
CRITICAL RULES — VIOLATIONS WILL BREAK THE WORKFLOW:
- Never run midscene commands in the background. Each command must run synchronously so you can read its output (especially screenshots) before deciding the next action. Background execution breaks the screenshot-analyze-act loop.
- Run only one midscene command at a time. Wait for the previous command to finish, read the screenshot, then decide the next action. Never chain multiple commands together.
- Allow enough time for each command to complete. Midscene commands involve AI inference and screen interaction, which can take longer than typical shell commands. A typical command needs about 1 minute; complex
actcommands may need even longer.- Always report task results before finishing. After completing the automation task, you MUST proactively summarize the results to the user — including key data found, actions completed, screenshots taken, and any relevant findings. Never silently end after the last automation step; the user expects a complete response in a single interaction.
Automate web browsing using npx -y @midscene/web@1. By default, launches a headless Chrome via Puppeteer that persists across CLI calls — no session loss between commands. Also supports CDP mode and Bridge mode to connect to an existing Chrome browser.
What act Can Do
Inside a single act call in the browser, Midscene can click, right-click, double-click, hover, type or clear text, press keys, scroll, drag, long-press, and continue through multi-step page flows based on what is currently visible. When touch input is enabled, it can also handle swipe- or pinch-style interactions on touch-oriented pages.
When to Use
This skill has three modes. Choose based on the user's intent:
Mode Selection Guide
| Mode | When to use | How it works |
|---|---|---|
| Puppeteer (default) | User wants to browse a URL, scrape data, test UI — no need for their own browser | Launches a new headless Chrome, isolated from user's browser |
| CDP mode | User says "connect to my Chrome", "control my browser", "CDP", "remote debugging", or wants to operate their existing browser. Also use when the task implicitly requires login state (e.g., "check my orders", "open my dashboard", "look at my account") | Connects to user's Chrome via DevTools Protocol. Requires remote debugging enabled (chrome://inspect > "Allow remote debugging"). No extension needed |
| Bridge mode | User explicitly mentions "bridge", "extension", or has Midscene Chrome Extension installed and prefers to use it | Connects to user's Chrome via the Midscene Chrome Extension |
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.
- 5d ago First seen · 411 lines · 191 tokens per session scan A 9aa7c602a700
browser-automation is a skill published in the GitHub repository web-infra-dev/midscene-skills (306 stars, last pushed 18d ago), licensed MIT. It adds 191 tokens to every session and 5,936 once invoked, about $0.0010 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 2026-08-30.
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