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Box by Simular

Drive a cloud Linux desktop through MCP: browse Chrome, interact with the screen, and run shell commands.

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Install Box by Simular

Pick your client, then add it in one click or paste the config.

Streamable HTTP (Remote)
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "box-by-simular": {
      "command": "npx",
      "args": [
        "-y",
        "@simular-ai/box"
      ],
      "env": {
        "MCP_BOX_API_KEY": "YOUR_VALUE_HERE"
      }
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

Values are written into the snippet above so you can paste it as is. They never leave your browser.

Hosted endpointLive · TodayLive Remote EndpointOur automated health check connected to this remote MCP endpoint successfully.Last checked 11/9/2026, 6:15:32 PM

Clients with native remote MCP support can connect directly to this URL.

Remote endpoint
https://mcp.box.simular.ai/mcp
We couldn’t confirm it starts correctly

The install command installed and started the server, which then stopped for configuration (such as an API key) that our sandbox does not have — expected for servers that connect to your account.

npx -y @simular-ai/box

Process exited before answering initialize.

This is an experimental automated check and can have false negatives — missing environment variables, a slow cold install, etc. It doesn’t necessarily mean something’s wrong. Last checked Today.

Overview

box by Simular MCP server gives AI agents access to a cloud Linux desktop with Chrome and a shell. Agents interact with the remote environment through MCP to browse, click, type, read the screen, and execute commands while the user's computer remains available. The desktop can be watched live and taken over at box.simular.ai/box. Reach for it when an agent needs an isolated browser or coding environment, or when a task should continue remotely while you are offline.

Use cases

  • Browse websites in an isolated cloud desktop
  • Run coding commands without occupying the local machine
  • Inspect and interact with graphical web applications
  • Offload a coding task while you are away
  • Take over a live remote session when needed

Key features

  • Cloud Linux desktop with Chrome
  • Remote shell command execution
  • Screen reading and graphical interaction
  • Live viewing and manual takeover
  • Coding-task offload and return workflow
  • OAuth and personal-key authentication paths

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked Today

Recent health check succeeded.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 4d ago via OSV.dev · @simular-ai/box (npm)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads4.7kPackage downloads in the last 30 days.
Last commitTodayMost recent push to the default branch.
Install checkRunsOur sandbox started it; it then asked for an API key or config.

How Box by Simular works

What box by Simular MCP server does

box by Simular connects an AI agent to a hosted Linux desktop rather than the computer where the agent is running. The desktop includes Chrome and a shell, giving an agent a place to browse websites, interact with graphical interfaces, inspect the screen, and run terminal commands.

The remote session is accessible at https://mcp.box.simular.ai/mcp. You can watch the desktop and take control from https://box.simular.ai/box, which is useful for checking agent activity or handling an interaction yourself.

How it works

The agent sends MCP requests to the hosted box endpoint. Browser and desktop actions happen in the cloud environment, while shell commands execute there instead of on the user's local machine. This separation lets the local computer remain available for other work.

The repository contains agent-specific packages for Claude Code and Cowork, DeepSeek Harness, the command-line connector, and Hermes Agent. The command-line connector also supports an offload workflow: a coding task can be moved into a fresh Claude Code, Codex, or Cursor session in the box, then brought back with its commits and handover text. Claude Code exposes this workflow through /box:offload and /box:back; other agents and terminals use npx @simular-ai/box offload and npx @simular-ai/box back.

Setup and configuration

For most agents, add the MCP endpoint and complete a one-time browser sign-in through the box installation flow. The CLI connector can be installed with:

Terminal
npx @simular-ai/box connect

Run npx @simular-ai/box doctor to check the CLI setup. Claude Code and Cowork use the Simular plugin marketplace commands. Hermes uses a personal key in MCP_BOX_API_KEY, with OAuth available as an alternative. DeepSeek Harness uses a personal cb_... key entered on its plugin page. Hermes and OpenClaw can also use a personal key with the CLI's --auth key option.

Tools and capabilities

  • Browse with Chrome in the cloud desktop.
  • Click and type in graphical applications.
  • Read the remote screen.
  • Execute commands in the cloud Linux shell.
  • Watch the session and take over through the box web interface.
  • Offload coding work to a remote agent session and bring back commits and handover notes.

Limitations and notes

Authentication depends on the client package: supported clients may use OAuth, while some integrations require a personal key. Agent-specific installation packages are distributed through different channels, so setup commands vary by client. The offload and back commands are available through the Claude Code plugin or the CLI workflow rather than being described as generic MCP operations.

Read the full README View source on GitHub

Reviews

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Frequently Asked Questions about Box by Simular

box by Simular is an MCP server that connects AI agents to a cloud Linux desktop with Chrome and a shell. Its main tools let agents browse, click, type, read the remote screen, and run commands. Users can watch the desktop live and take control through the box web interface.

Install it through your agent's supported package or connect the MCP endpoint at https://mcp.box.simular.ai/mcp. For the CLI integration, run `npx @simular-ai/box connect`, then use `npx @simular-ai/box doctor` to check the setup. Most agents require a one-time OAuth sign-in.

Yes, box by Simular supports Cursor through the CLI connector and can also run an offloaded coding task in a fresh Cursor session. Connect it with `npx @simular-ai/box connect`; the connector uses OAuth unless the selected workflow calls for a personal key.

Yes, you can watch the remote desktop and take control at https://box.simular.ai/box. Agent actions occur in the cloud Linux environment, while the web interface provides live visibility and manual interaction.

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