A page shows its history

Who and what, on one line. The agent that made the change and the person it was acting for — the one who dropped the file or asked for the note — because an agent does not edit a page on its own. Then the kind of change: created the page, edited the page, renamed the page. Then when. A page nobody has written on says No changes yet. Three edits from one filing are three lines for now; folding them into one is a later refinement.

The text before and after, and where it came from. What the change replaced is struck through; what it wrote is highlighted. Page references inside them are links, as on the page. Below, the source the change came from and the spot in it — the page of a PDF, the line of a note — as a link that opens the original the way the row under Documents does: a new tab, or Couldn't open this beside it.

Your words are kept with the change. A note you asked Snoopy to file, or a correction you gave it, shows what you said. A source in a room you are not in reads Source not available to you — no name, no spot — the same refusal you get if you try to open it.

Older changes know what, not who or why. Before 5 September nothing recorded which agent made a change or which source it came from, so those lines say An agent and open to No source recorded. The text is still there. A page the old agent rewrote whole shows rewrote the page and opens to the two versions.

Undo stays with the agent for now — tell Snoopy in the channel and the reversal is recorded here like any other change; a button on the line is later. Correcting by reply is its own rung. A list of the page's sources, rolled up from these lines, is the step after. Nothing here tells you where a single sentence came from — a change is recorded per edit, so the source and page named are the edit's.