ANYSPHERE · MCP CLIENTQUICKSTART · 2 MIN

Cursor × Hail

Cursor's Composer agent reads MCP configs from your home directory. Add Hail to give Composer the ability to call humans, send SMS confirmations, and send emails — without leaving the editor.

Cursor EditorComposer Agent

Three steps. That's the bar.

~120 SECONDS · COFFEE OPTIONAL

Grab an API key

Sign in to the Hail console and create a project key. Keep it scoped to the project — you can rotate or kill it any time without touching the rest of your stack.

console.hail.so → Keys → New

Drop Hail into your config

Add the Hail MCP server using the snippet below. Paste it where this client expects MCP servers — the path varies, the shape doesn't.

Cursor Settings → Features → Model Context Protocol

JSON · ~/.cursor/mcp.json

{
  "mcpServers": {
    "hail": {
      "url": "https://mcp.hail.so/v1",
      "headers": { "Authorization": "Bearer hl_live_••••" }
    }
  }
}

Try it once. It works or it doesn't.

Reload the client. The Hail tools should surface in the agent's toolset. Send the prompt below — if a call is placed, an SMS lands, or an email shows up in the inbox view, you're done.

Composer prompt: "Email design@acme.dev a summary of today's changes."

■ NOTES & GOTCHAS

Cursor supports both stdio and remote MCP. Remote is recommended for Hail.
Tool calls show up in Composer's tool drawer with full args.
Restart Composer after first config edit (subsequent edits hot-reload).

Cursor × Hail

Three steps. That's the bar.

Grab an API key

Drop Hail into your config

Try it once. It works or it doesn't.

Hail your first call — from this client.