What you see

Mason has three surfaces: the island in the menu bar, the panel under it, and the app window. Each is made to be read in one to three seconds: a figure or a few words in large type, the detail one press away.

The island

A strip of dark glass inside the menu bar, growing leftwards from the notch: a hand at work, and the work share in per cent. It takes only the free room between the menus of the app in front and the notch, so it covers no menu, no status icon and no window. With little room it keeps only the mark, and behind an app with very many menus it is not there at all.

When something changes, one word shows for a few seconds: the name of the project, Private, Debrief ready.

To the right of the notch sits the eye:

The panel

Press the island. The project you were last in, where you left it in six words, and today's split in large type: work, social, other. They always sum to 100. Time inside a project counts as work whatever the window is called, and idle time over a minute is left out. The day turns over at 04:00, so a late night stays one day.

Two round buttons: hear where you left off, and the debrief call, lime when one is ready.

Press a figure to open the app window.

Today

The split of the day, then one line per project: its name, where it was left, the time, a play button. Press a line for the rest: what the project is, how it is put together, what was built, what is still open.

Two things turn up here by themselves.

The look back. After three days of work Mason says how the work was done, in at most three plain sentences: where you went right after sending a prompt, how long finished answers waited, how often you changed tool. It is written once and left as it was, with the numbers one press away. Mason is never told what a day is for.

A proposal. What you told your agents again and again, in several projects, is proposed as one rule, shown with the words it rests on. Mason does not write it. Give it to Claude Code (or Codex, or Cursor) opens that agent with a prompt that is ready and not sent. You read it, press Enter, and the agent shows the change before it saves. The wording can be changed first. A rule that would let agents publish or delete without asking is never proposed. See Rules for every agent.

Flow

The tools of the day with their own icons, and a line between two of them as thick as the jumps between them. Two figures on top: the jumps, and the longest unbroken stretch. A tool in a browser tab is known by the site it is on. Under the picture every tool of the day is named, and pressing one shows it among the tools it trades places with.

Replay cuts one piece of real work for someone else to sit beside: every prompt as it was said, how long the agent worked on it, where you were meanwhile, and how long the answer waited. Nothing is recorded for it: it is cut afterwards from what Mason keeps anyway. You read every line and press the ones to leave out. Until you switch names on, a project is "Project A". Save page writes one HTML file to data/share/, Copy as text puts it on the clipboard.

Share draws the flow of the day or the week as one picture, 1080 by 1350. Only the names of tools are on it. It starts with the five tools the work was done in, and any tool goes in or out with a press, seven at most.

Mason writes the file and posts nothing.

Days

A calendar of every day worked, back to the first day of each project, and each project's month as a strip. Beside the hours with agents stand the tokens they took, by day and by project, as the agents' own logs count them. It is a count, not a cost.

Workflow

Thirty days of the agents' logs as one card: which agent you talk to and how much, prompts an hour, how long an agent works on one prompt, how many projects a day, the tokens a day of work takes, and what you tell your agents again and again. It is read from logs that are already on the Mac, so it is there the first day.

Share makes it a picture and a file. Opening someone else's file puts theirs beside yours. See Share and try workflows.

Built

Mason asks one question at a time about a project you worked on: how it is put together, what you decided, what you built last, where you left it. Show gives what Mason remembers. Nothing is typed. Ask me aloud turns it into a call, with a voice switched on.

More

• Find. Type what it was about and get the project, by meaning and not by the words, in Swedish or English. With nothing typed it shows what you told your agents again and again across projects. Off until switched on: see Find by meaning.
• Recap. The week as a two-minute news bulletin in two voices. Needs a voice: see Models and voice.
• Agents. The address and the tools of the MCP server. See Agents and MCP.

A word on the island

A nudge is a word on the island at the moment it can be acted on. It rests on your own history, never on a clock or a list you keep. There are two:

• Waited 9 min · PROJECT. An answer has waited twice as long as you usually leave one, while you are at the Mac in another tool.
• Done before · PROJECT. A prompt you just sent is the same piece of work as one in another project, a day or more ago. Needs Find switched on.

Each nudge is followed up. A kind you ignore three times in a row goes quiet for two weeks by itself. At most one in ten minutes and six in a day. A word on the island in Settings shows how the last week went and switches them all off.

Calls

With a voice switched on, Mason can call you. Nothing rings: a call is offered, and you take it when you have two minutes.

• The debrief. After a block of real work the island says Debrief ready. Mason opens with what it saw and asks three or four short questions. An answer that holds a decision or a rule is saved in your words while you talk. It explains the whole thing back and asks what it got wrong.
• The recall call. The round ? beside a project. Mason asks you how your own project is put together, says what you had right and brings up what you left out.

You always see whether you are heard: the microphone's level moves around its icon, and one word says who has the floor.

It is free

After forty days of work a card says, the way an old archiver did, that the trial has ended and a license must be bought, and then that there is no license. It asks once for work for the man who built it. Use evaluation copy puts it away for good. Nothing is locked, before or after.

Go private

Press the pill at the top of the app window, the one that says what Mason is doing. Everything stops at once and the eye closes. Nothing is recorded until you press it again.