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mcp/harbor

Cursor BorealHost create_mailbox

How to: Cursor BorealHost create_mailbox

client:Cursor transport:streamable-http tool:create_mailbox

Add BorealHost to Cursor

  1. 01

    Open ~/.cursor/mcp.json and merge this in. Keep any servers already there. 

{
  "mcpServers": {
    "mcp": {
      "url": "https://borealhost.ai/mcp/"
    }
  }
}
  1. 02

    Save the file and restart Cursor.

  2. 03

    Ask for something create_mailbox does. Cursor lists the server's tools on connect and calls create_mailbox itself — you do not invoke it by name.

  3. 04

    If nothing happens, check the server is running and that BorealHost's identifier in your config matches the one above exactly.

Use .cursor/mcp.json in a project root instead to scope it to that project. Cursor merges both. Cursor docs

Set these first

BorealHost will not start until these are set, so create_mailbox never becomes available.

  • BOREALHOST_API_KEY

Same tool, other clients

This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what the server actually exposes, not what its listing claims.

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.

BorealHost MCP server