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Connect Cursor to the Arcus docs MCP server so its agent and chat panes can answer questions and write code grounded in the live spec.

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Prerequisites

  • Cursor 0.45 or newer (MCP support required)

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Setup

1

Open MCP settings

In Cursor, open Settings → Cursor Settings → MCP (or run the command palette: MCP: Add new server).
2

Add the Arcus server

Add an entry with the following configuration:
{
  "mcpServers": {
    "arcus-docs": {
      "url": "https://docs.arcus.xyz/mcp"
    }
  }
}
Save the file. Cursor stores user-level MCP servers in ~/.cursor/mcp.json and project-level ones in .cursor/mcp.json at the repo root — pick whichever scope fits.
3

Authenticate

Cursor will prompt you to authenticate the first time it talks to the server. Click Sign in, complete the OAuth flow in your browser, and return to Cursor.
4

Try it

Open the agent or chat pane and ask:
Show me how to subscribe to the orderbook WebSocket channel for BTC-USD.
Cursor will call the MCP server and ground its answer in the live Arcus reference.

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Notes

  • If the OAuth popup never appears, upgrade Cursor — remote MCP with OAuth landed in recent versions.
  • For the underlying server details, see the MCP server overview.