Stop re-explaining the same decisions to your AI

Name: justonce.ai
Author: justonce.ai

Every new chat starts without the decisions you made last week. JustOnce is a memory your assistant reads and writes, so a decision saved once (the retainer, the naming rule, the stack) is recalled in every later session, with the date it was made and the words you used. Change it and the old value stays in the history.

Get started free Prompts to copy

Why do I keep re-explaining the same decisions?

Because a chat is not a record. What you decided last Tuesday lives in a conversation you will not reopen, a note you will not find, or your head. So you re-explain the same client rules, the same preferences and the same choices, several times a week, or you maintain a context document you paste into every new chat.

JustOnce is a separate memory your assistant connects to at https://mcp.justonce.ai, so the record belongs to your account and outlives any single conversation.

What actually happens once it is connected?

You tell your assistant on Monday that a client bills at a fixed monthly retainer and hates being called a “partner”. On Thursday you open a new chat to draft their newsletter, and it already knows both. Nothing was pasted, nothing was re-typed. The assistant asked JustOnce and got the fact you saved.

Connecting takes one command per tool — claude mcp add --transport http justonce https://mcp.justonce.ai — or a one-click deeplink in Cursor and VS Code, or a pasted connector URL in Claude Desktop and ChatGPT. Sign-in is OAuth; there is no API key to copy around. Recall and search are free on every plan, including Free.

What happens when a fact changes?

It supersedes rather than overwrites. Tell any connected assistant that the retainer went up in August and the old figure is not deleted — it is marked as what was true until August. That matters the first time you need to reconstruct what you charged in July, or work out which version of a decision a document was written against.

Memories are bitemporal. Corrections create a new value and keep the previous one, so your assistant can answer “what was true as of 1 July” as well as “what is true now”, and show every value a fact has held.

Can I see what it remembers about me?

Yes — that is the point of the design. Every memory is a visible record in the web app that you can read, correct, scope or remove. Each one keeps your exact words alongside the tidied-up version, so you can always check what was actually said against what was summarised. Recall results carry a confidence tier, so a shaky inference does not get presented to you as a fact.

Verbatim-first storage keeps the raw text on every memory. Confidence tiers run from VerifiedFact (0.90+) down, and are surfaced in recall results. Forgetting a memory is a soft, reversible invalidation rather than a hard delete.

What does JustOnce not do?

It does not read your chat history. Nothing is captured automatically from ChatGPT, Claude, Slack, a CRM or your mailbox — a memory exists because you or your assistant saved it, you uploaded a file, or you forwarded an email to your own ingest address. And recall respects sharing boundaries: your assistant sees your own vault plus what other members have explicitly shared into a space with you — each shared result attributed to the person who shared it — and nothing beyond that. We would rather spell the limits out here than have you find out in week two.

There are no connectors that read a third-party product on your behalf. Assistant search covers the caller’s personal space plus memories shared with them through active shared spaces — nothing beyond what space membership grants.

Copy and paste

Prompts for this

Paste these into any assistant you've connected to JustOnce. They work as written.

Save a decision once

Stores it as a durable memory, classified and with the people and organisations in it extracted. Your assistant can recall it in any later chat.

Remember this: we bill Acme a fixed monthly retainer, invoiced on the 1st, and they specifically do not want to be called a "partner" in any copy.

Pick up where the last chat left off

Searches your vault and reads the standing context back, so a fresh chat starts where the last one finished.

Before we start, check JustOnce for what I already know about the Acme newsletter project and summarise it back to me.

Correct something without losing the old value

Supersedes the fact rather than overwriting it. The previous value stays available in the memory’s history.

Update what you know about the Acme retainer — it went up from 1 August. Keep the old amount in the history.

Ask what was true back then

Runs an as-of query and returns the value that was valid on that date, not the current one.

What was the Acme retainer as of 1 July this year?

Audit what it holds about a topic

Returns the memories with their confidence tiers, so you can spot anything stale or wrong and correct it.

List everything you have stored about Acme, and tell me how confident you are in each one.

Get set up in one line

Adds JustOnce to Claude Code. Run it once, sign in with OAuth, and the assistant can recall and save from then on.

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

The full prompt library

FAQ

Questions

Does JustOnce work with ChatGPT and Claude at the same time?

Yes. JustOnce is a remote MCP server, and each assistant connects to the same endpoint under your own account. Claude, Claude Code, ChatGPT, Cursor, VS Code, Windsurf and Gemini can all be connected at once, and they read and write the same memory. Free accounts get two connections; paid plans are unlimited.

Do I have to remember tool names or commands?

No. You talk to your assistant in plain language and it decides which JustOnce tool to call. “Remember that I bill Acme monthly” saves a memory; “what do I know about Acme” searches for one. The 21 tools exist for the assistant, not for you.

Is my memory used to train AI models?

No, never. Your memories are not used to train models by us or by anyone else. Data is hosted in Australia on Azure, and memory bodies and documents are encrypted at rest.

What happens if I stop paying?

Everything you have already saved stays searchable, because recall and search are free on every plan including Free. Paid plans meter what you add each month, not what you read back. Nothing is deleted when an allowance runs out.

How is this different from ChatGPT’s built-in memory?

ChatGPT’s memory keeps short notes about you inside ChatGPT and keeps only the latest value. It cannot hold a document, cannot be shared with a partner or team, and cannot say what a fact was last month. JustOnce keeps documents and your exact words, dated, where you can open, fix and share them.

Can I bring what ChatGPT already knows about me?

Yes. Ask ChatGPT to list its saved memories, then paste them into a connected assistant and ask it to import them into JustOnce. Bulk import loads 50 at a time, and every new account gets a one-time welcome bonus of extra memories you can spend on exactly this.

Which AI tools can connect?

Any MCP-compatible client. Claude Code and the Gemini CLI connect with a single command, Cursor and VS Code have one-click deeplinks, and Claude Desktop, ChatGPT and Windsurf take a pasted connector URL. There is no browser extension.