Skip to content

Give your agent a memory in about a minute

Add the remote MCP server https://mcp.justonce.ai to your assistant and sign in with OAuth; there is no API key to paste. Claude, Cursor and VS Code take a one-click link; Claude Code, Gemini CLI and Codex CLI take one command; ChatGPT takes the URL on the web. Switch assistants or use several: your memory stays in one place, so what you save in one is already there in the next.

Works with Claude, ChatGPT (Business, Enterprise and Edu), Cursor, VS Code, Gemini CLI, Codex and Claude Code. On ChatGPT Pro your assistant can read your memory but not save to it. The board below has each one’s state and the day we checked it.

https://mcp.justonce.aiOAuth sign-inStreamable HTTP
Setup stepsWhat works today

What works today.

Each row shows the day we checked it, and moves only after a live test. A guide below doesn’t mean the client works yet.

Works
Connects and signs in today, checked against our live server: your assistant can recall and save.
Recall only
It can find what you saved, but can’t save new things.
Testing
There’s a way to set it up, but no live test has passed yet. It may not work.
Not yet
No tested way to connect it to JustOnce yet.

Assistants

  • Claude

    claude.ai, Claude Desktop and the Claude app

    Works

    One custom connector on your Claude account covers every Claude app. Every plan, Free included: Free allows one custom connector, which is all JustOnce needs.

    Setup steps

    Checked 26 October 2026

  • Claude Code

    Works

    One command in your terminal, then /mcp to sign in. Or use the connector on your Claude account.

    Setup steps

    Checked 26 October 2026

  • ChatGPT

    ChatGPT on the web (Business, Enterprise and Edu)

    Works

    Works on ChatGPT Business, Enterprise and Edu, on the web; an admin adds it for the workspace. Not offered on Free or Go; Plus unconfirmed. Through ChatGPT, JustOnce refuses to save what looks like a password, PIN, card, bank or ID number; add those in the app instead.

    • ChatGPT ProRecall only
    Setup steps

    Checked 26 October 2026

  • Cursor

    Works

    One-click install link; sign in when Cursor shows “Needs login”.

    Setup steps

    Checked 26 October 2026

  • VS Code

    GitHub Copilot agent mode

    Works

    Command Palette → MCP: Add Server, or the install link. On Copilot Business or Enterprise your org must allow MCP servers in Copilot.

    Setup steps

    Checked 26 October 2026

  • Gemini CLI

    Works

    One command, then /mcp auth justonce inside Gemini CLI.

    Setup steps

    Checked 26 October 2026

  • Codex CLI

    Works

    One command, codex mcp add justonce --url https://mcp.justonce.ai, then codex mcp login justonce.

    Setup steps

    Checked 26 October 2026

  • Glama

    Works

    Works at the protocol level; its in-app steps are unconfirmed.

    Setup steps

    Checked 26 October 2026

  • Windsurf

    Testing

    Windsurf doesn’t publish the sign-in address it uses, so we haven’t been able to test it. It may not connect yet.

    Setup steps

    Checked 26 October 2026

  • Gemini app

    Not yet

    Google doesn’t document a way to add a custom MCP server to the Gemini app yet. Gemini CLI works.

    Checked 26 October 2026

  • Copilot (consumer)

    Not yet

    Microsoft doesn’t document a way to add a custom MCP server to the consumer Copilot app. VS Code with GitHub Copilot works.

    Checked 26 October 2026

  • Grok

    Not yet

    No tested way to connect yet.

    Checked 26 October 2026

Personal agents (Grok Bot, OpenClaw and others) are on /agents.

Choose your assistant, follow four steps.

About a minute, no API key, just a sign-in. Each guide carries its state from the board; a guide marked Testing isn’t verified yet.

Claude Code

One command in your terminal

  1. 1

    Open your terminal

    Anywhere Claude Code runs — no project or config file to edit first.

  2. 2

    Run the connect command

    Registers JustOnce as a remote MCP server over Streamable HTTP.

  3. 3

    Sign in with OAuth

    Run /mcp in Claude Code and pick JustOnce; it opens your browser to sign in with Auth0. No API key needed.

  4. 4

    Tell it to remember something

    Say “remember that…” and Claude stores it — then recalls it in every session.

Terminal
$claude mcp add --transport http justonce https://mcp.justonce.ai

Run this command

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

Sign in with OAuth — no API key to paste. JustOnce uses Auth0 (PKCE, with CIMD or Dynamic Client Registration).

Adds JustOnce as a remote MCP server; /mcp then opens the OAuth sign-in in your browser. Or use the connector on your Claude account, which Claude Code can use too.

Connected

Your assistant can now read your JustOnce memory, and save to it where its plan allows.

Every guide, one endpoint.

Each guide adds the same remote MCP server and signs in to the same memory. No per-tool accounts, no key juggling.

Claude Code

Works

One command in your terminal.

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

Claude

Works

claude.ai, Claude Desktop and the Claude app · one-click add.

https://mcp.justonce.ai

Add to Claude

ChatGPT

Works

ChatGPT on the web · Business, Enterprise and Edu.

https://mcp.justonce.ai

Cursor

Works

One-click install link.

https://mcp.justonce.ai

Add to Cursor

VS Code

Works

One-click install link.

https://mcp.justonce.ai

Add to VS Code

Gemini CLI

Works

One command in your terminal.

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

Codex CLI

Works

One command in your terminal.

codex mcp add justonce --url https://mcp.justonce.ai

Glama

Works

Add a remote MCP server.

https://mcp.justonce.ai

Windsurf

Testing

Add a remote MCP server.

https://mcp.justonce.ai

Other MCP clients

Untested · try a remote connector by URL.

https://mcp.justonce.ai

Get started free

Free: 20 memories and 10 document pages a month, no card. We never train AI on your memories.

Connecting, answered

Something else? Ask us.

Do I need an API key to connect?

No. Every client signs in with OAuth (Auth0) — using PKCE, with a client metadata document (CIMD) or Dynamic Client Registration, so there is no API key to copy, paste, or store. You just approve a browser sign-in the first time.

Which AI tools can connect to JustOnce?

Works with Claude, ChatGPT (Business, Enterprise and Edu), Cursor, VS Code, Gemini CLI, Codex and Claude Code. On ChatGPT Pro your assistant can read your memory but not save to it. Glama connects at the protocol level, and Windsurf is still in testing (checked 26 October 2026; the board at the top of this page has each one's state). MCP clients that sign in with OAuth on your own computer can connect; we add hosted apps one at a time, once we've seen their sign-in address, so if yours is refused, tell us which one.

What is the connection endpoint?

https://mcp.justonce.ai — a remote MCP server over Streamable HTTP. Add it once per tool and sign in with OAuth; no local install or proxy is required.

Is my memory shared across every tool?

Yes: every assistant you connect reads the same JustOnce memory. Switch assistants or use several: your memory stays in one place, so what you save in one is already there in the next. Works with Claude, ChatGPT (Business, Enterprise and Edu), Cursor, VS Code, Gemini CLI, Codex and Claude Code. On ChatGPT Pro your assistant can read your memory but not save to it.

No JustOnce account yet?

No account yet? Sign up in the sign-in window when you connect. Or create your free account on the web first; it will be waiting when you connect.

Give your agent a memory

Free: 20 memories and 10 document pages a month, no card. Connecting takes a minute at a computer.

Get started free

Works with Claude, ChatGPT (Business, Enterprise, Edu), Cursor, VS Code, Gemini CLI and Codex