[teamleaderleo]

Slice S2 of Leo's sidebar-organization ask (item A, the "now:" line). It builds on #23390.

What changes

While an agent chat in a workspace works, a row that already has a second line shows "Now: …" there, with what the agent is doing right now (for example "Now: Running the test suite"). The text is the acpmux lane's step, which acpmux already masks; the raw prompt is never shown.

• Rows keep their height. A one-line row stays one line, so rows don't grow and shrink as agents start and stop.
• Which chat. With several chats working in one workspace, the one that started last is shown.
• Toggle. Debug toggle sidebar.nowLine, on by default.
• Strings. New string sidebar.row.now, in all 21 locales.

Capture

The capture uses expanded rows; the Debug fixture sidebar.laneFixture gives each row a sample agent state, picked by workspace name so it is the same on every run. The working rows (mobile, api-server) show "Now: Running the test suite", and S1's words show on the rest.

Capture steps-f80a41da25 at 3bc155c1a105 (fleet build, capture mini, text checked for private data)

Light	Dark

Tests

Tests/CmuxNextAppTests/SidebarNowLineTests.swift (committed first):

• a working row knows its step and an idle one doesn't;
• a row with a second line says it there;
• a one-line row stays one line;
• toggle off.

Observed / Not run

• Ran:
  • scripts/cmux-next/prepush-gate.py: no new violations.
  • Fleet compile-check --app passed on 64c74b4 and 3bc155c.
  • Independent reviews: SHIP at 64c74b4, 32b71cc and 3bc155c.
• Not run locally: the Swift suites (no builds on this Mac); this PR's CI runs them.

Changelog

• Added: A working sidebar row's second line says what its agent is doing now.

Agent session: cosmic-gray

🤖 Generated with Claude Code

[teamleaderleo]

Owned by chief-sidebar on cosmic-gray · session

[github-actions]

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

Review 98e8a08: 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=pr23474 -f ref=leo/sidebar-now-line -f platform=macos -f backend_mode=local

Not verified: macOS jobs did not run: compile and app tests were skipped on 98e8a08bc6; ci-status is green without them.

CI passes on 98e8a08bc6 (run 39635743280 attempt 1).
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped (the macos job needs both to succeed). Re-run CI once they pass, before merging.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

Tour of 98e8a08bc6 (run)

Path-selected interactions

Interaction

Changed paths

core

Packages/macOS/CmuxNext/Sources/CmuxNextAgentLanes/SidebarLaneFixture.swift Packages/macOS/CmuxNext/Sources/CmuxNextAgentLanes/SidebarLaneStatus.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Logic/SidebarLayoutMetrics.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Logic/SidebarTunables.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Logic/WorkspaceRowContent.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Model/SidebarWorkspace.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Resources/Localizable.xcstrings Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Strings\+Priority.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Views/WorkspaceRowView\+Accessibility.swift Packages/macOS/CmuxNext/Sources/CmuxNextSidebar/Views/WorkspaceRowView.swift Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/SidebarNowLineTests.swift

Core UI (before): DEGRADED — 19 ok, 1 unavailable

Video (mp4)

#	Step	Result	Command
1	Launch	ok
2	New workspace	ok	cmux workspace new --name Tour
3	Type in the terminal	ok	cmux workspace name:Tour screen current pane current tab current terminal current write --text "echo hello from the cmux-next tour\r"
4	A command reports progress: tab loading spinner	ok	cmux workspace name:Tour screen current pane current tab current terminal current write --text "clear; printf '\\033]9;4;3\\007'; sleep 900\r"
5	Split right	ok	cmux action run splitRight
6	Split down	ok	cmux action run splitDown
7	New terminal tab	ok	cmux action run newSurface
8	Browser tab	ok	cmux tab new-browser --url https://example.com
9	Hide the sidebar	ok	cmux action run toggleSidebar
10	Show the sidebar	ok	cmux action run toggleSidebar
11	Notification	ok	cmux notify --title Tour --body "Hello from CI"
12	Notifications panel	ok	cmux action run showNotifications
13	Agent chat	ok	cmux agent new-chat
14	Agent workspace	ok	cmux workspace new --name Agent
15	Agent starts	ok	cmux workspace name:Agent screen current pane current tab current terminal current write --text "clear; printf '\\033]7501;state=working\\033\\\\'; sleep 8; printf '\\033]7501;state=done\\033\\\\'; sleep 900\r"
16	An agent works: row working spinner	ok	cmux workspace new --name Notes
17	The agent finishes: done mark in the spinner's place	ok
18	Session tree: keycaps on the first rows	ok	cmux settings set sidebar.sessionTree true
19	Session tree back off for later tours	ok	cmux settings set sidebar.sessionTree false
20	Profile menu	unavailable: exited 1 (the menu shot needs a screen capture route)	cmux action run sidebar.profileMenu

Screenshots (15)

1. Launch


2. New workspace


3. Type in the terminal


4. A command reports progress: tab loading spinner


5. Split right


6. Split down


7. New terminal tab


8. Browser tab


9. Hide the sidebar


11. Notification


12. Notifications panel


13. Agent chat


16. An agent works: row working spinner


17. The agent finishes: done mark in the spinner's place


18. Session tree: keycaps on the first rows

### Core UI \(after\): DEGRADED — 19 ok, 1 unavailable

Video (mp4)

#	Step	Result	Command
1	Launch	ok
2	New workspace	ok	cmux workspace new --name Tour
3	Type in the terminal	ok	cmux workspace name:Tour screen current pane current tab current terminal current write --text "echo hello from the cmux-next tour\r"
4	A command reports progress: tab loading spinner	ok	cmux workspace name:Tour screen current pane current tab current terminal current write --text "clear; printf '\\033]9;4;3\\007'; sleep 900\r"
5	Split right	ok	cmux action run splitRight
6	Split down	ok	cmux action run splitDown
7	New terminal tab	ok	cmux action run newSurface
8	Browser tab	ok	cmux tab new-browser --url https://example.com
9	Hide the sidebar	ok	cmux action run toggleSidebar
10	Show the sidebar	ok	cmux action run toggleSidebar
11	Notification	ok	cmux notify --title Tour --body "Hello from CI"
12	Notifications panel	ok	cmux action run showNotifications
13	Agent chat	ok	cmux agent new-chat
14	Agent workspace	ok	cmux workspace new --name Agent
15	Agent starts	ok	cmux workspace name:Agent screen current pane current tab current terminal current write --text "clear; printf '\\033]7501;state=working\\033\\\\'; sleep 8; printf '\\033]7501;state=done\\033\\\\'; sleep 900\r"
16	An agent works: row working spinner	ok	cmux workspace new --name Notes
17	The agent finishes: done mark in the spinner's place	ok
18	Session tree: keycaps on the first rows	ok	cmux settings set sidebar.sessionTree true
19	Session tree back off for later tours	ok	cmux settings set sidebar.sessionTree false
20	Profile menu	unavailable: exited 1 (the menu shot needs a screen capture route)	cmux action run sidebar.profileMenu

Screenshots (15)

1. Launch


2. New workspace


3. Type in the terminal


4. A command reports progress: tab loading spinner


5. Split right


6. Split down


7. New terminal tab


8. Browser tab


9. Hide the sidebar


11. Notification


12. Notifications panel


13. Agent chat


16. An agent works: row working spinner


17. The agent finishes: done mark in the spinner's place


18. Session tree: keycaps on the first rows

_{Tours are data in scripts/cmux-next/media/tours: add a step or a tour file to show your feature.}

[teamleaderleo]

Bead cx-usa2g created for this PR by the cmux coordinator.

[teamleaderleo]

Review (claude-review-subagent): SHIP at 64c74b4

I read the diff against the merge-base with feat-cmux-next. Nothing was built or run.

Correctness

• Isolation is fine. SidebarLayoutOptions.rowContent (nonisolated) reads only ws.agentStep and content.detail. Strings.rowNow is called only on the main actor, in WorkspaceRowView.configure and accessibilityText. .map(Strings.fn) is already used in this module (WorkspaceHoverCard.swift:544, PresenceDotsView.swift:40), so passing the main-actor function reference is fine.
• Row height does not change. SidebarLayoutMetrics.height(for:) only counts lines (content.detail == nil ? 0 : 1) and never measures text width. The new line is set only when detail != nil, and stays non-nil both while the agent works and after it stops. So the "Now: " prefix in the drawn text cannot change the row's height, and hasSubtitle = row.detail != nil still agrees with what is drawn. Every rowContent caller (SidebarLayout, +Fold, SidebarRowIndex patching) goes through the same function, so layout and in-place patches agree.
• The guard change in SidebarLaneStatus.applying is fine. Lanes are now read when only nowLine is on, and merge and chip are still each gated on their own toggle. rowStatus is on by default, so lanes were already read by default before this PR. No new cost by default.
• The chip from cmux-next sidebar: each row says when its agent needs you, finished or failed (the Priority view's words) #23390 works alongside this. The chip writes content.chip/content.time on the name line, and the new line writes content.now/content.detail on the second line. A working lane gets no chip, and a needs-you/failed lane gets no step (step keeps only .working). So both never describe the same lane.
• Tests:
  • aRowWithASecondLineSaysItThere: WorkspaceRowContent(expanded:) takes notification, then description, then lastMessage, so setting lastMessage gives detail != nil. Valid.
  • aOneLineRowStaysOneLine: under the default WorkspaceRowElements.standard, the only second-line text is agentStatus, and the fixture row has no status, so detail == nil. Valid.
  • SidebarLaneStatusTests.toggleOffLeavesRowsAsTheyWere checks only activity, and merge stays gated on laneStatus, so it is unaffected. SidebarRowStatusTests checks only chip, time, activity and order, so it is unaffected too.
• Localization: sidebar.row.now is valid JSON, has all 21 locales (no locale missing compared with the catalog), every value is translated, and each has exactly one %@. It has a translator comment and extractionState: manual, the same as nearby entries. Swift "Now: \(step)" interpolation produces %@, so the source and catalog match.

Nits (not blocking)

• The doc comment on SidebarLaneStatus.applying still says "with both toggles off no lane is read". There are now three toggles.
• On a compact row whose second line shows folder, branch, description, etc., the step replaces the whole line, not just one part of it. That matches the "in place of the second line's text" doc, so I take it as intended. If people miss the folder while an agent works, prepending the step to the line would be the follow-up.
• agentStep is shown as-is. If an acpmux step can contain a newline, the subtitle could show odd text. A trim or first-line cut in step(_:) would be cheap insurance.

[teamleaderleo]

cmux-next guards / defaults-snapshot is red on 20 of 21 fresh feat-cmux-next PR heads in the last 2:00:00, so it is most likely a base red, not this PR's. The base-reds lane has it; a base merge picks up the fix once it lands.

[teamleaderleo]

Review (claude-review-subagent): SHIP at 32b71cc

Scope: git diff 64c74b4fb5b3..32b71cc2e8e6 (read locally, no build or test run).

Correct:

• import Foundation (internal under InternalImportsByDefault) is fine: Foundation is used only inside the body of step(_:) (trimmingCharacters(in: .whitespaces)), never in a public or package signature. Sibling files in CmuxNextAgentLanes already import it the same way.
• split(whereSeparator: \.isNewline) on String gives [Substring] and drops empty pieces, so a leading blank line still yields the first real line; Substring.trimmingCharacters(in:) comes from Foundation's StringProtocol extension and returns String. The result type String? matches.
• Isolation: SidebarLaneStatus is @MainActor, and so is SidebarNowLineTests (@MainActor @Suite), so the synchronous call in aStepOfSeveralLinesShowsItsFirst compiles.
• Test expectation holds: AgentActivityLane.of(summary:) keeps the step as given (it only maps "" to nil), so " Running tests\nsecond line" becomes "Running tests".
• The doc comment fix ("every toggle") is accurate.

Findings:

1. (mismatch, not a blocker) The commit subject says "the lane fixture picks by name so captures are stable", but SidebarLaneFixture.swift is not in this commit: at this head it still hashes workspace.id (line 23). That change seems to be uncommitted in the author's worktree. Either push it (that new head then needs a quick re-review) or drop the claim from the squash message and PR body. It is Debug-only capture code, so it doesn't block.
2. (nit) If the latest working lane's step has only whitespace or blank lines, step returns nil instead of falling back to an older working lane that does have a step. This is rare and harmless: the row just stays one line.

[teamleaderleo]

Review (claude-review-subagent): SHIP at 3bc155c

Scope: git diff 32b71cc2e8e6..3bc155c1a105, one file, Packages/macOS/CmuxNext/Sources/CmuxNextAgentLanes/SidebarLaneFixture.swift (Debug capture fixture behind sidebar.laneFixture, off by default). Read locally only, not built or run.

• Correctness: the state pick now hashes workspace.name in place of workspace.id. WorkspaceModel.name is public internal(set) var name: String (CmuxNextDaemon/Store/WorkspaceModel.swift:12), so .unicodeScalars.reduce works the same as before. The & 0xFFFF mask keeps the accumulator non-negative, so % states.count stays in range. An empty name gives 0, which is still a valid index.
• Isolation: WorkspaceModel is @MainActor @Observable and SidebarLaneFixture is @MainActor, so the read is on the main actor. The function already read workspace.name for the lane's name/title, so Observation tracks nothing new.
• Identity: the lane id is still fixture:\(workspace.id), so lane ids stay unique per workspace. Two workspaces with the same name share a sample state, and renaming a row changes its state. Both are intended for a capture fixture (stable captures across slots, where ids differ).
• Doc comments were updated to match.

No findings.

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[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.3966508748201 (331e2e901c)