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box by Simular

Official registry AI and agents

A cloud Linux desktop for your AI: browse, click, type, read the screen and run commands.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http box-by-simular 'https://relay.simular.cloud/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "box-by-simular": {
            "type": "http",
            "url": "https://relay.simular.cloud/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

box by Simular: plugins

box gives your AI agent a computer of its own: a cloud Linux desktop with Chrome and a shell that it drives over MCP, while your own computer stays free. You can watch it live and take over at https://box.simular.ai/box.

Most agents need no plugin: add the MCP server https://relay.simular.cloud/mcp and sign in once (see https://box.simular.ai/install). This repository holds a package for each agent that installs box its own way. Each folder stands alone and is released through that agent's channel.

AgentFolderSign-inInstall
Claude Code and Coworkclaude/OAuth, once in the browser/plugin marketplace add simular-ai/box-plugin, then /plugin install box@simular-box
DeepSeek Harness (dsh)dsh/Personal key (cb_...)dsh/README.md

Adding an agent

Add a folder named after the agent with its own manifest, MCP config and, where the agent supports skills, a copy of claude/skills/box/SKILL.md. Point it at https://relay.simular.cloud/mcp. Use OAuth sign-in where the agent supports it; otherwise read a personal key from an environment variable, never from a file in the package. Add a row above.

Releasing

  • claude/: bump version in claude/.claude-plugin/plugin.json; Claude Code picks it up from the marketplace.
  • dsh/: bump version in dsh/package.json, then push a tag dsh-vX.Y.Z. The release workflow attaches dsh-box.tgz.

Frequently asked questions

What is box by Simular?

A cloud Linux desktop for your AI: browse, click, type, read the screen and run commands.

How do I install box by Simular?

It runs as a remote server. In Claude Code: claude mcp add --transport http box-by-simular 'https://relay.simular.cloud/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does box by Simular need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is box by Simular open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains box by Simular?

It is published by simular-ai. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.