Moon Blur doesn’t spot client, people or project names on its own. The “Your data to mask” list adds them to what it detects: each term on the list is replaced with a placeholder in everything that goes out to the model.
Where to find your listLink to the Where to find your list section
- Open “Settings” › “Data and privacy”.
- The “Moon Blur” section is at the top of the page: scroll down to “Your data to mask” (open it directly).
“Find a setting”, at the top of Settings, also takes you there: type “Moon Blur”.
You can also get there from the Moon Blur details of a message: the “Add a term to mask” button.
Plans that include itLink to the Plans that include it section
The list is included from the Constellation plan up (Constellation, Galaxie, Univers). How many terms it can hold depends on the plan: the page shows it as “12 of N terms”. To compare plans, see pricing.
The list is personal: it follows you in all your workspaces, but it only applies in a workspace whose plan includes it. What you see depending on the situation:
| Situation | What you see | What happens |
|---|---|---|
| The workspace plan includes the list | The “Add terms” area and the “Applied in this workspace” badge | Your terms are replaced in all your conversations in this workspace. |
| The plan doesn’t include it, empty list | A locked “Add terms” line with the required plan | Clicking it shows the plans that include the list. |
| The plan doesn’t include it, list already filled (another workspace, plan change) | “This workspace’s plan does not include your list. It is kept, but Moon Blur does not apply it here.” | The list is kept; you can read it and delete terms. |
| The list has more terms than the plan allows (after a plan change) | “Your list has more terms than this workspace’s plan allows. It is still applied in full.” | The whole list applies; adding is blocked until you have deleted enough terms. |
| The list is full | “Limit of N terms reached. Remove a term to add another.” | A “More terms” line shows the plans that accept a longer list. |
Routines and agents that work in a workspace follow that workspace’s plan.
Add termsLink to the Add terms section
- In “Add terms”, type a term, or paste several, one per line. Case and accents are ignored.
- Below the area, a preview shows what will happen: “3 to add”, “1 already in your list”, “1 repeated in the text”, “2 cannot be added”.
- Click “Add”. Rejected lines stay in the area with their reason, so you can fix them.
Term rulesLink to the Term rules section
| Rule | Message if it isn’t met |
|---|---|
| At least 2 characters | “Too short, 2 characters minimum” |
| At most 100 characters | “Too long, 100 characters maximum” |
| At least one letter or digit | “Needs at least one letter or digit” |
No word starting with MB_ (reserved for Moon Blur placeholders) | “A word starts with MB_, which is reserved for Moon Blur” |
| No control or unusable characters | “Contains a character that cannot be used” |
Two terms that differ only in case, accents or spaces are the same term: it is kept only once (“Already in your list”).
How your terms are recognizedLink to the How your terms are recognized section
Moon Blur looks for your terms in all the text sent to the model, including code blocks, web addresses and file names.
| Rule | Example with the list “Acme Holding”, “Paul Martin”, “Project Phoenix”, “Dupont” |
|---|---|
| Case and accents are ignored | “ACME HOLDING”, “acme holding” and “Acmé Holding” are masked. |
| Whole words only | The term “Paul” doesn’t mask “Paulette”. |
The _, - and . characters separate words | “Dupont” is masked in “Contract_Dupont_2026.pdf”. |
Within a term, spaces, _, - and . are equivalent | “Project Phoenix” is masked in “project-phoenix” and in “Project_Phoenix_v2.docx”. |
| The longest term goes first | With “Paul” and “Paul Martin” on the list, “Paul Martin” becomes a single placeholder. |
Each way a term is written gets its own placeholder: “Acme Holding” and “ACME HOLDING” become CUSTOM_01 and CUSTOM_02. In the answer, each one is put back exactly as you wrote it.
Your terms are also replaced in what Moon AI adds to your message for the model: conversation history, attached documents, tool results, an agent’s instructions and your custom instructions.
See your masked termsLink to the See your masked terms section
Below a message, the Moon Blur details (“Show”) list each term from your list with the placeholder CUSTOM_01, CUSTOM_02… and the note “From your list”.
Manage your listLink to the Manage your list section
- Counter: “12 of N terms” shows how many terms you have and how many the plan allows.
- Search: beyond 8 terms, the “Search your terms” field filters the list.
- Show more: the list is shown 100 terms at a time.
- Delete a term: the cross to the right of the term.
- Delete everything: the “Remove all” button, then confirm “Remove the whole list?” Moon Blur will no longer replace these terms.
Unreadable termLink to the Unreadable term section
If a term can no longer be read, it appears as “Unreadable term”. Delete it, then add it again. As long as the page says your messages aren’t being sent in this workspace, delete these terms before writing: Moon Blur refuses to send a message whose terms it couldn’t mask.
Where the list doesn’t applyLink to the Where the list doesn’t apply section
- Developer API and workspace keys: they don’t use your list. See Privacy and Moon Blur in the API.
- Moon CLI: it has its own Moon Blur on your computer. See Moon Blur in Moon CLI.
- What Moon Blur never covers (connected services, images, voice…): see the limits.