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Connect Cursor

A one-click deeplink installs JustOnce as a remote MCP server; sign in the first time Cursor calls a tool.

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Written by Aaron Wittman
The Cursor guide with the Add to Cursor button

  1. Click Add to Cursor on justonce.ai/connect. Cursor opens with JustOnce pre-filled as a remote MCP server ({"url": "https://mcp.justonce.ai"}).

  2. Confirm the install — Cursor shows the server details; accept to add it to your MCP settings.

  3. The first time Cursor calls a JustOnce tool it opens the JustOnce sign-in. Sign in (or create your account there), then click Allow.

  4. Ask Cursor what it knows about your project conventions — it recalls the same memory as your other assistants.

Manual route: Cursor Settings → MCP → Add new global MCP server and paste:

{
  "mcpServers": {
    "justonce": { "url": "https://mcp.justonce.ai" }
  }
}

Troubleshooting

  • If justonce shows as needing authentication in Cursor's MCP settings, select it and finish the sign-in.

  • If the sign-in window never returns to Cursor, check the Connections page in the app: if the connection is listed, restart Cursor.

  • Cursor's own tool-call approval applies; allow JustOnce tools when prompted.

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