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

Two steps. That's the bar.

~60 SECONDS · NO API KEY

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"
    }
  }
}

Click Allow. Then try it.

Reload the client. On first use it pops a browser tab — sign in to Hail (or sign up — takes 30 seconds), click Allow, and tokens flow back to the client. 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 negotiates OAuth from the URL alone via Dynamic Client Registration — first tool call opens the consent browser tab.
Project-scoped override: .cursor/mcp.json at the repo root takes precedence over the home-directory file.
Tool calls show up in Composer's tool drawer with full args.
Restart Composer after first config edit (subsequent edits hot-reload).
Manage or revoke this app at https://hail.so/console/apps after first connect.
Self-host? Set HAIL_API_KEY as the bearer; see docs/setup/mcp.

Cursor × Hail

Two steps. That's the bar.

Drop Hail into your config

Click Allow. Then try it.

Hail your first call — from this client.