Agent Activity Panel

The Agent Activity Panel is the primary surface for reviewing what an agent has been doing across your knowledge base. Where the presence bar tells you an agent exists and the inline margin bursts show what changed on the doc you're viewing, the Activity Panel answers the bigger question: what has this agent done in its session across every file?

The panel lives inside the document panel on the right (the same panel that houses the outline, backlinks, graph, and timeline tabs). At the top of the document panel is a mode toggle: Document (the default — shows info about the file you're currently viewing) and Activity (shows an agent's session). Click the mode toggle at any time to flip between the two; click the panel's collapse button in the editor header to hide the panel entirely.

Opening the panel

Click any agent's avatar in the presence bar. This flips the document panel to Activity mode and scopes it to that agent. If the panel is currently collapsed, it auto-expands. Clicking the same avatar a second time flips back to Document mode. Clicking a different agent's avatar swaps the scoped agent (stays in Activity mode).

The Activity mode button is disabled when no agents have active sessions — you'll see a tooltip "No active agents".

The panel is keyed to a single agent. Observing two agents side by side is not supported in v1.

Anatomy

Header

• Avatar + display name. Identifies the agent this panel is for.
• Status chip. "Active" while the agent's session is alive. "Ended" when their MCP keep-alive connection has closed past the grace window and the per-session state has been garbage-collected.
• Close (×). Closes the panel. Esc also closes.

File list

One row per file the agent has touched in this session, ordered by most-recent activity descending.

• Carrot (▸ / ▾). Toggles the file row between collapsed and expanded.
• Filename. A clickable link. Clicking navigates the main editor to that doc and leaves the panel open with the expanded state preserved. This is the only affordance in the panel that navigates — opening the panel, expanding rows, and dispatching undo never move the main editor.
• Cumulative diff stat (+N −M). Sum across every burst for this file.
• Most-recent-burst timestamp. How long since the agent last wrote to this file.
• Writing indicator. When the agent is currently writing to this specific file, the row shows a subtle writing… label with a soft pulse.

Bursts

Each expanded file row lists that session's bursts — one per captured Y.UndoManager StackItem. Rapid-fire writes within 500 ms merge into a single burst (matching Y.UndoManager's default capture window); sequential tool calls with normal LLM / network latency map 1:1 to bursts.

Each burst row shows a timestamp and its own +N −M stat. Clicking a burst row expands it to reveal the inline unified diff for just that burst — what the agent inserted (green) and deleted (red), with three lines of context around each hunk.

Bursts are display-only. All undo lives at the file row, not at individual bursts.

Undoing agent edits

Two buttons live at the bottom of each expanded file row:

Both buttons are safe under concurrent writers. The panel only touches Items this specific agent's session owns — another agent's writes on the same file, or your own WYSIWYG edits, are never affected.

Both buttons are disabled when the session has ended or the stack is empty.

After an undo, the panel re-fetches automatically. When a file row has zero remaining bursts, the row disappears.

When a session ends

Once an agent's MCP connection closes past the grace window (about 30 seconds), the server garbage-collects their per-session state. Clicking that agent's (now-greyed) avatar flips the panel to Activity mode with a Session ended banner; undo buttons within any residual rows render disabled. Historical review across ended sessions is future work — the Activity Panel is a live-session surface.

Live updates

The panel subscribes to a push signal on the server's __system__ Y.Doc. When the agent you're watching writes to a new file, a new row appears within roughly half a second of the write landing — no polling, no refresh.

What the panel does NOT do

• It never auto-navigates. Opening the panel, expanding rows, and dispatching undo all leave the main editor's active doc and scroll position untouched. Only an explicit filename click navigates.
• It does not decorate the sidebar. No badges, no "this file was touched" markers on the filetree. The panel is the review surface; the sidebar stays focused on your own navigation.
• It does not follow the agent. If you want to tail what the agent is doing, click the avatar, watch the panel, and keep your editor wherever you like.

See also

• [[timeline]] — historical view of every revision on the current document, across all writers.
• [[collaboration-recovery]] — how the editor protects content when concurrent writes collide.