Run many browser profiles with an AI agent
Let Claude Code, Cursor, VS Code or Antigravity create, open and work inside many signed-in browser profiles, each with its own proxy, without sharing cookies between accounts.
The problem
You manage many accounts on the same sites: shops, Facebook pages, ad accounts, customer inboxes. An AI agent could do the repetitive part, but a typical browser automation tool starts a fresh, signed-out browser on every run, and one shared Chrome mixes cookies between accounts.
What NextCore Browser does
- One profile per account. Each profile is a separate Chromium browser with its own cookies, sign-ins, storage, extensions, proxy and fingerprint. Accounts stay signed in between runs.
- A local MCP server in the app. Your agent connects to
http:/with a token. Nothing is exposed to the internet./ 127.0.0.1:<port>/ mcp - One-click setup for Claude Code, Cursor, VS Code and Antigravity: the app writes the config file and a separate token for each assistant. Other MCP clients use the JSON shown in the app.
- Page control inside each profile with
browser_*tools that have the same names as the official Playwright MCP, so an agent that knows Playwright MCP already knows them. - The agent manages profiles for you: list, create, edit, open, close, arrange windows into a grid, back up to an encrypted file, check a profile's proxy, and check it for IP, timezone and WebRTC leaks.
- Several agents at once. One MCP session drives one profile; open more sessions to run several profiles in parallel. A profile held by one session is refused to the others.
Numbers (version 0.3.165)
| MCP tools, full set | about 190 |
| Smaller sets for clients with a tool limit | 127 tools (?bo=app, fits VS Code's limit of 128) · about 50 tools (?bo=co-ban) |
| Assistants with one-click setup | 4 (Claude Code, Cursor, VS Code, Antigravity) |
| Operating systems | Windows 10/11, macOS (Apple silicon and Intel), Linux |
What to ask your agent
- "List my NextCore Browser profiles in group Shop that have a failing proxy."
- "Create 10 profiles named Shop 01 to Shop 10 and attach these proxies in order."
- "Open 4 profiles of group Farm 2 and arrange them as a 2×2 grid on the second monitor."
- "Open profile Shop 03, go to my Facebook group and tell me how many posts are waiting for approval."
How it compares
| Playwright MCP alone | One Chrome with several profiles | NextCore Browser | |
|---|---|---|---|
| Stays signed in between runs | No, fresh browser each run | Yes | Yes |
| Proxy per account | No | No, one proxy for the whole browser | Yes, per profile, with a health check |
| Agent can create and manage profiles | No | No | Yes, through MCP |
| Several agents on separate accounts at once | One browser per server | Cookies can leak between accounts | Yes, one session per profile |
| Runs only on your machine | Yes | Yes | Yes, MCP listens on 127.0.0.1 |
Get started
- Download the app from homestaynextcore.org/nextcore-browser and sign in.
- Create profiles and attach proxies: Profiles, Proxy.
- Connect your assistant: MCP for AI agents.
The linked setup pages are in Vietnamese for now. The app starts with a free trial before you choose a plan.
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