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Connect Claude Code

One command in your terminal; the OAuth sign-in opens in your browser.

A
Written by Aaron Wittman
The Claude Code guide on justonce.ai/connect

  1. Open a terminal anywhere Claude Code runs — no project or config file to edit.

  2. Run:

    claude mcp add --transport http justonce https://mcp.justonce.ai
  3. Start Claude Code (or run /mcp in an open session) and choose justonce → Authenticate. Your browser opens the JustOnce sign-in. Sign in, or create your account there, then click Allow.

  4. Say "Remember that I prefer window seats" — then in a new session ask "What seat do I prefer?".

Troubleshooting

  • "Needs authentication" — run /mcp, select justonce and authenticate again. Tokens are per machine.

  • Command not found — update Claude Code; remote HTTP servers need a 2025-or-later build.

  • To remove: claude mcp remove justonce. You can then Forget its entry on the Connections page to tidy the list.

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