Correct a fact rather than replacing it, and the old value stays on record. When your agent corrects one of your memories in JustOnce, the earlier value is kept in its history, so months later you can ask "where did we live on 1 February?" and get the answer from then. That history covers your own memories.
Corrections keep the old value — ask what was true last March. Memories others share with you show their current value. It works for a policy that renews, too. Ask "what did the car policy say before it renewed?" and you get the earlier excess, not today's, as long as the renewal was saved as a correction to your policy memory.
Why does the old value still matter?
Life changes constantly. The insurance renews with a new excess. You move in March. The electricity account gets a new number when you switch retailers. Many tools treat the new value as the only value, so the old one disappears the moment you update it.
But the old value keeps coming back. A form asks for your previous address. A claim or a refund depends on what the policy said on the day something happened. A letter arrives quoting the old account number, and you need to know it's yours. Paper filing handled this by keeping both letters.
Some assistants do keep history for their own memory. OpenAI says ChatGPT's saved-memory controls, depending on your plan and platform, "can also include search, sorting, automatic prioritization, and version history" (checked 26 October 2026). The difference with JustOnce is where it lives: your memory lives in JustOnce, not inside one assistant, so the history is there for each assistant you connect. As of 26 October 2026, 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.
Correct it once, and keep the history
When something changes, ask your assistant to correct the existing memory rather than save a new one. Give it the whole corrected statement, not just the change:
In JustOnce, correct my address memory: since 1 March 2026 we have lived at [new address]. Before that we lived at [old address]. Keep the history.
A correction supersedes the old value instead of erasing it. The earlier wording and values stay readable, with the dates each one was true and the date the record changed. The history lives on the memory itself, which is why the correction matters: if your assistant saves a second, separate memory instead, the two values never appear together in one history.
The same goes for documents. When the renewal notice arrives, hand it to your assistant and ask it to read it, update the policy memory with the new excess and dates, and keep the new schedule with it. Your AI does the reading; JustOnce does the remembering.
If that memory is shared into a space, the people you share with see the corrected value the next time their assistant checks the space, credited to you. They don't need to do anything, and nobody keeps answering from last year's excess. The history stays on your memory, where you can look back through it whenever a form or a claim asks about the past.
Ask what was true on a date
There are two different questions you can ask, and JustOnce keeps them apart.
What was true on a past date?
Ask "Where did we live on 1 February 2026?" Your assistant asks for the value as of that date and gets back the old address, with the period it was valid for. This works best for facts like where you live, where you work, or anything you've told it in the form "my X is Y".
What did the record say before I corrected it?
Sometimes the old value was never true. You typed the policy number wrong in January and fixed it in May. Asking what the record said on 1 April gives you the mistaken number, which explains why a letter from April quotes it. This only differs from the first question where a correction replaced an earlier belief.
For a single memory, you can also ask for its full history: "Show me the history of the car insurance memory." Your assistant gets every value it has held, with both sets of dates.
Where can I see a memory's history?
Every memory has its own page in the web app, and that page shows its history as a timeline: each earlier value, when it was true, and when it was replaced. It's the quickest way to check a correction landed where you meant it to.
What are the limits of memory history?
- Your own memories only. Through an assistant, as-of questions and history cover the memories you saved. A memory someone shared with you comes back with its current value. If your partner saved the car policy and shared it, they can ask about its history.
- Who can correct a shared memory. The person who saved it, or an Owner or Editor of the space, through their own assistant or the web app. Only the person who saved it can erase it.
- Forgetting is permanent. A correction keeps history. Forget means gone — there's no restore. If you only want something out of the way, archive it in the web app instead; an archived memory can be restored.
- It only knows what you told it. If nobody saved the old policy, there's no old excess to look up. Start keeping the trail now and it builds from today.
Starter prompts
Copy these into your assistant once JustOnce is connected. In Claude, custom connectors are available on every plan, Free included, and the setup guide has the steps for each assistant.
We've moved. Correct my address memory in JustOnce to [new address], from [date]. Keep the old address in its history.
Our car insurance has renewed. Read this renewal notice and correct the existing policy memory with the new excess, premium and renewal date. Keep the history, and keep the new schedule with it.
Where did we live on [date]? Check JustOnce as of that date.
What did my policy memory say before I last corrected it? Show me its history.
I need my previous address for a form. Look it up in JustOnce and tell me the dates we lived there.
The features page has more on how your agent's memory works, the document store guide covers keeping policies and letters, and sharing memories with anyone covers sharing them.
