[teamleaderleo]

Leo, 2026-11-02, about his chat showing a column of rows that alternated "Background task finished" with a lone "·" agent reply under each: "why do you still do these", then "should we improve the app then".

What changes

1. A run of background-task notifications folds into one line. Two or more in a row (a quiet background turn's ended line, a background shell's end noted as finished or stopped) draw as one muted line, the same look as the single line: 4 background tasks finished (or N background updates when a stopped shell or a scheduled check is among them). A click opens the run to its rows exactly as they drew before; each member line still opens to its own rows. A failed shell, a running line, a turn the agent answered with something to say, or any other row ends the run, so a real reply stays in sight. A single line stays as it was.
2. An agent reply of only punctuation and white space (., ·, …) draws no row. This widens isBareAgentText (Transcript: status and tool rows sit flush; a lone "." reply draws nothing #32726 hid a lone .) to any punctuation, so the row, its height and the turn's visibility agree, for an agent's reply and for another agent's received message. A person's . or ? is still a message. The check stops at 64 characters, so a streamed token never costs more than that. The Transcript: status and tool rows sit flush; a lone "." reply draws nothing #32726 test that said .. and … still draw is widened to match.

With #32798 (a quiet background line with nothing to open draws no line), a background turn whose only reply was · now has nothing to open, so it draws no line at all. That is Leo's exact screenshot: the four "Background task finished" + · pairs go away, and the stopped task's note stays. Runs of lines that did open to something (a log read, a check) fold into the one counted line.

No notification row loses information (open the run to see each one), and no other row type changes.

How

• conversation/backgroundRuns.ts: foldBackgroundRuns, one pass over a turn's shaped rows next to foldMessageRuns in shapedTurn (and the rows before the first prompt). The run line reuses the background turn row kind, so its height, spacing and look are the existing line's; it carries backgroundRun instead of background. Its open state lives in the transcript fold set, keyed by its first member, and is part of the cached turn's key (openBackgroundRuns). Its version hashes member versions and the open state, so memoized rows and the height cache keep it across snapshots.
• hiddenRowFolds opens the run (then the member line) for Find and links.
• BackgroundTurnLine draws the run line. Two new strings, in every catalog language.
• Transcript cost: no new pass over the whole transcript per token. The fold runs inside turn shaping, which already walks the live turn's rows, and finished turns stay cached.

The design spec for the transcript surface gets the same rule (leo-workspace design/chat-transcript.md).

References

Design references used: codex-mobile/live/grouped-activity-rows (Codex's "Finished 1 agent ›" count rows) and claude/live/transcript-tool-rows-and-task-list (Claude's "Ran 5 commands (1 failed) ›"). Both fold repeated activity into one counted line with a chevron, which is the look used here. Other wordings considered: "Finished 4 background tasks" (Codex's verb first) and "Background task finished ×4". The noun-first form matches the existing single line, so the line keeps its wording and only gains a count.

Gallery

agent-pane.background-runs, five variants: closed (Leo's case: four in a row with lone dots), open, mixed (a stopped shell among them), reply-kept (a task with a real reply splits the run), single-line.

Tests

• conversation/backgroundRuns.test.tsx: punctuation-only replies; four lines with lone dots fold, open in order; stopped shells count as updates; a real reply splits a run; failed and running lines end it; an individually opened member keeps its rows inside the run; Find opens run then member; version stability.
• conversation/visibleMessage.test.ts: punctuation-only agent words are bare; Done., ok, + are not.
• test/agent-pane-background-turns.test.ts: reducer-level reproductions of the chat's event shape: quiet turns answered only with · draw no line and no dot; quiet turns that also ran a check fold into one 4 background tasks finished line that opens to the four lines in order. Also of the chat's event shape (four quiet task turns, each answered with a · in its own message, with config updates between). The dots are tagged to their turns and the view draws one line with no dots.
• Fleet runs at the head: the focused files pass (36 tests), typecheck and bun run check pass. The review's finding (closing a run left its last member's opened rows visible) is fixed with a test. In the combined conversation + test/agent-pane-background* run, the only failure is only Open in terminal, inside the opened note, opens the task's terminal, which fails the same way on base 5ee63b3.

Agent session: agent session

🤖 Generated with Claude Code

[teamleaderleo]

Owned by an agent session · session

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[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review bfee958: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr32884 -f ref=leo/collapse-bg-task-rows -f platform=macos -f backend_mode=local

Gallery before/after for bfee958: 16 states rendered, 10 images differ, 3083 more touched states not rendered. Images are in the run's artifact, not on this public PR; the independent review of this head reads them on its own, so the PR needs no hand-made screenshots of these states.

gh run download 41573818240 -R manaflow-ai/cmux -n gallery-advisory-32884-bfee958adf09579ea6bac9b6ec83ebd759f9c870 (then read gallery-review.json)

States

State	Theme	Status	Diff	Picked by
agent-pane.background-runs/closed	Apple System Colors Light	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/closed	Apple System Colors	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/open	Apple System Colors Light	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/open	Apple System Colors	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/mixed	Apple System Colors Light	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/mixed	Apple System Colors	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/reply-kept	Apple System Colors Light	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/reply-kept	Apple System Colors	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/single-line	Apple System Colors Light	new	0%	own BackgroundRuns.gallery.ts
agent-pane.background-runs/single-line	Apple System Colors	new	0%	own BackgroundRuns.gallery.ts
agent-pane.chat-width/standard	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.chat-width/standard	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.chat-width/wide	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.chat-width/wide	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.chat-width/wide-blocks	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.chat-width/wide-blocks	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-edge/short-edge	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-edge/short-edge	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-edge/wide-edge	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-edge/wide-edge	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-edge/no-edge	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-edge/no-edge	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-floats/scrolled-to-end	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-floats/scrolled-to-end	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-floats/composer-grown	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-floats/composer-grown	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-40	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-40	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-56	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-56	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-72	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.composer-rest-gap/gap-72	Apple System Colors	unchanged	0%	own App.tsx

_{Pick other states with a Gallery: entry.id, entry.id/variant line in the PR body.}

red: cmux-next checks (god files, concurrency, crash safety, l10n); no finished base run on 2f3ccfe to compare; do not merge until green; see lane-rules

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4158655642901 (38369c1a88)

[teamleaderleo]

Review (codex, router-review): SHIP at 7283f73

Reviewer: codex gpt-6-astra high, fast tier.

Follow-ups: 3. Each lands as an issue in this repo that links this receipt; the lane that opened the PR fixes it forward.

SHIP at 7283f73
Visual verdict: no images; Leo tries the build

1. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/turns.ts:1637: Preserve the inner message-run reveal key. With live runs enabled, Find on a quiet background turn containing SendMessage and Read opens the background run and member but leaves the target hidden inside messageRun. Base reveals it successfully. Include messageRunRevealKey and update link consumers that currently accept only two fold keys.

2. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/visibleMessage.ts:25: Preserve empty-message handling beyond the punctuation cutoff. An assistant reply containing 65 spaces now returns false from isVisiblyEmptyMessage, restoring blank rows and marking empty background turns as having content. Base hides it. Add coverage for long whitespace and zero-width-only replies.

3. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/BackgroundRuns.gallery.ts:97: Capture the gallery variants when available; this bundle contains no images for visual review.

Confirmed findings 1–2 against reconstructed base using isolated Node/Babel probes. The full Bun suite was unavailable.

Follow-ups:

• Reveal every nested fold for Find and links.
• Keep long blank agent replies invisible.
• Capture the gallery variants.

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[cmux-bot]

cmux-bot approves 7283f73: an independent review passed this exact head (router-review receipt by teamleaderleo). A push needs a new review; a later BLOCK at this head dismisses this approval.

[blacksmith-sh]

Found 6 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmp17synyq_/summary-fail.json (live):/summary-fail.json (live):	View Logs
/tmp/tmp_xps7a_e/summary-missing.json (live):/summary-missing.json (live):	View Logs
[new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows/ [new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows	View Logs
[new_workspaces] the window draws no frames/[new_workspaces] the window draws no frames	View Logs
[tabs] debug.tab_switch timed 0 of 40 switches/ [tabs] debug.tab_switch timed 0 of 40 switches	View Logs
[tabs] the window draws no frames/[tabs] the window draws no frames	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[teamleaderleo]

Review (codex, router-review): SHIP at bfee958

Reviewer: codex gpt-6.1-sol xhigh, fast tier.

Follow-ups: 3. Each lands as an issue in this repo that links this receipt; the lane that opened the PR fixes it forward.

SHIP at bfee958
Visual verdict: no images; Leo tries the build

1. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/backgroundRuns.ts:77 — Opening a member containing a nested message run can make the counted group disappear. foldMessageRuns creates a row without inBackground, which this branch treats as a run boundary. Preserve ownership through synthesized rows so the group remains available to close.

2. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/turns.ts:563 — Closing a group leaves an opened member’s late subagent completion visible when it landed after a later prompt. Group folding only covers the current turn; the global ownership filter tracks individual disclosures. Apply group closure to member rows across prompt boundaries.

3. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/BackgroundRuns.gallery.ts:95 — Supply the five gallery captures; no after images were available for visual verification.

Follow-ups:

• Preserve background ownership through nested message runs.
• Hide late member completions when their group closes.
• Capture the five gallery variants.

[cmux-bot]

cmux-bot approves bfee958: an independent review passed this exact head (router-review receipt by teamleaderleo). A push needs a new review; a later BLOCK at this head dismisses this approval.