Multi Account Isolation

What it does

When your agent uses it

• Several of your own accounts
• Test identities run from one machine and the setup needs checking
• A profile tested clean but something still looks off
• Choosing which detection suites to run (CreepJS

Example prompts

• “profile isolation check”
• “fingerprint consistency test”
• “timezone mismatch”
• “/multi-account-isolation”

Requirements

• Python 3
• Node.js
• A credential in ANTI_DETECT_BROWSER_KEY

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Profile name reused? list_profiles, or compare browser.profile_dir per identity. Two identities in one directory explains everything else…
2. 2Same address twice? Confirm each public_ip is distinct.
3. 3Clock disagrees with the address? Print browser.timezone and browser.public_ip together.
4. 4Persona regenerated? If the canvas hash moved between launches, the profile is not frozen - check whether profile_dir or the cache…
5. 5Only then the fingerprint itself, verified with the suites above rather than assumed.

What it can do on your machine

Read from SKILL.md and the folder at commit b800e3a. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • python
  • npx
  • npm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • antibrow.com

  Also links to:

  • browserleaks.com
  • abrahamjuliot.github.io
  • whoer.net
  • pixelscan.net
  • liarjs.dev

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • ANTI_DETECT_BROWSER_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Multi Account Isolation loads about 2.9k tokens when it runs. Until then it costs about 256 tokens; SKILL.md has 1,290 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~256

When it runs · the whole SKILL.md, loaded when a task matches

~2.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from antibrow/anti-detect-browser-skills at commit b800e3a, republished under its MIT licence (© antibrow). 1,290 words, ~2,856 tokens.

name

multi-account-isolation

description

Verify that browser profiles are actually isolated from one another instead of assuming it - confirm each profile's timezone agrees with its own exit IP, that WebRTC exposes only the proxy, that canvas and WebGL hashes stay identical across relaunches of one profile, and that no two profiles share a persona, a cookie jar, or an address. Use when several of your own accounts or test identities run from one machine and the setup needs checking, when a profile tested clean but something still looks off, when choosing which detection suites to run (CreepJS, whoer, browserleaks WebRTC, pixelscan, liarjs), when auditing what a vendor runtime does with API and proxy credentials, or when asking which layers browser isolation cannot cover at all. Also for 'profile isolation check', 'fingerprint consistency test', 'timezone mismatch', 'WebRTC leak', 'canvas hash unstable', 'account association', 'temporary profile', '防关联', '多账号', '隔离自检'. The SDK is anti-detect-browser; MCP is browser-mcp-agent.

license

MIT

identity  →  profile  →  persona  →  proxy  →  timezone
   1      :     1     :     1     :    1    :     1

import { AntiDetectBrowser } from 'anti-detect-browser'

const ab = new AntiDetectBrowser({ key: process.env.ANTI_DETECT_BROWSER_KEY })

const identities = [
  { profile: 'fixture-us-01', proxy: process.env.PROXY_US_1, tags: ['Windows 10', 'Chrome'] },
  { profile: 'fixture-us-02', proxy: process.env.PROXY_US_2, tags: ['Apple Mac', 'Safari'] },
  { profile: 'fixture-de-01', proxy: process.env.PROXY_DE_1, tags: ['Windows 10', 'Edge'] },
]

for (const id of identities) {
  const { browser, page } = await ab.launch({
    profile: id.profile,              // isolated cookies, storage, login state
    proxy: id.proxy,                  // from the environment, one per identity
    fingerprint: { tags: id.tags },   // drawn once, frozen, replayed after
    label: id.profile,                // address-bar tag drawn by the kernel, unreadable from the page
  })
  // ... run the checks below, then ...
  await browser.close()
}

import os
from antibrow import launch

with launch(
    profile="fixture-us-01",
    proxy=os.environ["PROXY_US_1"],   # from the environment, never a literal
    geoip=True,            # timezone + WebRTC follow the proxy exit
    label="fixture-us-01",
) as browser:
    page = browser.new_page()
    print(browser.timezone, browser.public_ip)

python -m antibrow info          # kernels, profiles, license state, cache dir

browser.plan.redacted_args()     # exact kernel command line, secrets masked - safe to paste in a bug report

© antibrow, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in multi-account-isolation of antibrow/anti-detect-browser-skills.

Open the folder on GitHubat commit b800e3a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in antibrow/anti-detect-browser-skills, which our catalogue first saw on October 7, 2026.

• aiskillstore/marketplaceskills/antibrow/multi-account-isolation