Open a terminal anywhere Claude Code runs — no project or config file to edit.
Run:
claude mcp add --transport http justonce https://mcp.justonce.ai
Start Claude Code (or run
/mcpin an open session) and choose justonce → Authenticate. Your browser opens the JustOnce sign-in. Sign in, or create your account there, then click Allow.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.
