JustOnce

We test Claude, ChatGPT and Cursor end to end. The steps below follow each tool's own setup; if one doesn't connect, tell us which tool and what you saw.

gemini mcp add --transport http justonce https://mcp.justonce.ai

Start Gemini CLI. The JustOnce sign-in opens in your browser the first time a tool runs: sign in (or create your account), then click Allow.

Add a remote server with the URL <code>https://mcp.justonce.ai</code>.

Sign in to JustOnce (or create your account), click Allow, and the connection goes live.

1. Open Windsurf's MCP / plugins settings.
2. Add a remote server with the URL <code>https://mcp.justonce.ai</code>.
3. Sign in to JustOnce (or create your account), click Allow, and the connection goes live.

Windsurf shows up as Other client on the Connections page.

In Glama, open where MCP servers are configured and add a remote server with the URL above. Choose Streamable HTTP if asked for a transport.

When Glama sends you to the JustOnce sign-in, sign in (or create your account), then click Allow.

1. In Glama, open where MCP servers are configured and add a remote server with the URL above. Choose Streamable HTTP if asked for a transport.
2. When Glama sends you to the JustOnce sign-in, sign in (or create your account), then click Allow.

Look for "MCP servers", "custom connectors" or "remote tools" in your assistant's settings. Add a Streamable HTTP server at <code>https://mcp.justonce.ai</code>; when prompted, sign in — no API key required. Then ask it what it knows about you to confirm the link.

Apps that run on your own computer can usually sign in.

A hosted assistant (one that runs on a website) can only sign in once JustOnce trusts its return address. If the sign-in stops with The app's return address isn't one JustOnce trusts, tell us which assistant.

If your client only supports stdio servers, use its remote-proxy option (for example <code>mcp-remote</code>) pointed at the same URL.

- Apps that run on your own computer can usually sign in.
- A hosted assistant (one that runs on a website) can only sign in once JustOnce trusts its return address. If the sign-in stops with The app's return address isn't one JustOnce trusts, tell us which assistant.
- If your client only supports stdio servers, use its remote-proxy option (for example <code>mcp-remote</code>) pointed at the same URL.

Some newer agents don't let you add your own MCP server yet (as of October 2026):

Muse (Meta) — connects only to apps in Meta's own connector directory.

dots (OpenAI) — a dot's plugins are limited to apps OpenAI supports. Use JustOnce in ChatGPT instead (see Connect ChatGPT).

- Muse (Meta) — connects only to apps in Meta's own connector directory.
- dots (OpenAI) — a dot's plugins are limited to apps OpenAI supports. Use JustOnce in ChatGPT instead (see Connect ChatGPT).

We'll add steps here as soon as they open up. If you spot that one has, tell us.

Anything that supports a remote (Streamable HTTP) MCP server with OAuth works. Here are the common ones.

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