Aethyn Browser MCP — residential-proxy browser control for AI agents (pick the country, one identity per task)

An MCP server that lets an AI agent drive a real browser through residential proxies, choosing the exit country / city, tier, and a sticky per-task session — at call time. The browser (Playwright Chromium) runs locally on your machine; you bring your own proxy credentials. Defaults to Aethyn residential proxies, and works with any HTTP proxy you configure.

The only browser MCP where the agent picks the country and holds one identity per task.

Why this exists

• Playwright MCP drives a browser well, but its proxy is set once at server startup — one static exit for the whole session. The agent can't ask for a Japanese exit for one task and a German exit for the next.
• Hosted "web scraping" MCPs hide the proxy and hand back JSON — no runtime control over geo or session identity, and it's their pool at their price.

This server gives the agent runtime, per-task, steerable geo + sticky identity as tools — exactly what browser agents need to pull country-specific data (pricing, SERPs, catalogs, availability) and feed it into a chart or pipeline.

Quickstart

Add the server to your MCP client — Claude Desktop (claude_desktop_config.json) or Cursor (~/.cursor/mcp.json):

{
  "mcpServers": {
    "aethyn-browser": {
      "command": "npx",
      "args": ["-y", "aethyn-browser-mcp"],
      "env": {
        "AETHYN_USERNAME": "aethyn-XXXXX",
        "AETHYN_PASSWORD": "your-proxy-password",
        "AETHYN_DEFAULT_TIER": "premium"
      }
    }
  }
}

Chromium is downloaded automatically on first install (~170 MB, one-time). If your environment blocks post-install scripts, run it yourself: npx playwright install chromium.

⚠️ Set the tier to match your plan. AETHYN_DEFAULT_TIER defaults to premium (port 2099). If your account is Elite, set it to elite (port 5499) — otherwise traffic hits the Premium port and the proxy returns 407 (auth rejected), even though the browser launched fine. The agent can also override per task with tier: "elite".

That's it. Ask your agent something like "Launch a browser in Japan, open example.co.jp, verify the exit IP is Japanese, and give me the page as markdown."

Tools

How it's different

No trash-talk — just the capability delta. (Playwright MCP is great; it just wasn't built for per-task geo.)

Bring your own proxy

Aethyn is the default, but any HTTP proxy works — point PROXY_HOST at it and describe its username format with a template. [ ... ] segments are dropped when empty, and {country} {city} {state} {session} {lifetime} are filled from the agent's call:

{
  "mcpServers": {
    "browser": {
      "command": "npx",
      "args": ["-y", "aethyn-browser-mcp"],
      "env": {
        "PROXY_HOST": "gate.your-provider.com",
        "PROXY_PORT": "7000",
        "PROXY_USERNAME": "your-user",
        "PROXY_PASSWORD": "your-pass",
        "PROXY_USERNAME_TEMPLATE": "{username}-country-{country}[-city-{city}]-session-{session}-lifetime-{lifetime}"
      }
    }
  }
}

For a plain fixed proxy with no geo in the username, use "PROXY_USERNAME_TEMPLATE": "{username}".

Configuration

HTTP proxies only — Chromium can't authenticate SOCKS5, so this server is HTTP-only by design.

Guardrails

This tool is for collecting public data. Please:

• Respect robots.txt, rate limits, and each site's terms and the law. Can reach ≠ should.
• No login/credential-wall automation, and no CAPTCHA solving — there's no such capability. If a site shows a challenge, read the page and stop rather than trying to bypass it.
• Pace yourself. A residential IP firing dozens of requests per second is still obviously a bot.
• Your credentials stay in your MCP config on your machine; the proxy password is never logged.

Get credentials

Need residential proxy credentials? The free trial needs no card:

→ Create an Aethyn account · Quickstart docs · Pricing

Contributing

PRs welcome — especially extending data/locations.json with more countries, cities, and states (single lowercase alphanumeric tokens), and new client examples. Keep it real and runnable; use placeholder credentials only.

License

MIT — free to use, copy, and adapt.