How to use box by Simular with Cursor

box by Simular gives Cursor's agent a computer in the cloud. One click adds a Linux desktop with Chrome, a shell and files to Cursor as an MCP server. The agent can open a real browser, sign in and check the app it is building.

Read the Quick Start

What Cursor can do with box

• See the app it just changed. Open the dev or staging URL in Chrome on the box, click through the flow and report what broke.
• Sign in to the services your app uses. Log in once on the box; the agent reuses that session next time.
• Hand off to other agents. Let Claude Code or Codex pick up on the same box, with the same files.

Set up box in Cursor

Add to Cursor adds box in one click. For other ways to add it, and how to sign in, see Cursor in the MCP guide or the Quick Start.

Try these prompts

• "Use box to open http://<staging URL> in Chrome, log in with the test account and check that the new settings page saves."
• "Use box to open GitHub Trending and tell me what today's top 3 repositories do."
• "Use box to take a screenshot of our pricing page at mobile width and tell me what overlaps."

What box adds to Cursor

FAQ

• Is there a one-click install? Yes, the Add to Cursor link above.
• Does box replace Cursor's own agents? No. box gives Cursor's agent a computer to use; Cursor stays your editor.
• Does box use my Cursor plan? Cursor's agent uses its own model. Model calls made by box's own tools use box credits.
• Where do I see what the agent did? At your box, live.

Troubleshooting

box disconnected, or no box tools in chat? See Cursor in the MCP guide and Troubleshooting.

Related: Quick Start · Connect box over MCP