[teamleaderleo]

Leo, 2026-11-01: "the thoughts in between tool calls probably want a bit more padding"

What changed

A short interim note the agent writes between two runs of calls is folded into the run as a quiet line (turns.ts mergeShortNotes, drawn as .cv-tool-note in TurnRows.tsx). It had 3px to the tool rows around it, so in an opened run it sat tight against "List …" above and "Ran 2 commands" below.

• .cv-tool-note now has --cv-note-gap above and below it: the 12px plain status gap (--cv-status-gap-plain, the transcript's inner gap in design/grid.md 5.5). That is the room a longer reply between two runs already has (cmux#29124), so a note and a reply between tool rows read the same.
• model.ts activityStepHeight estimates a note as its 20px line plus the gap on both sides, so estimated heights match drawn ones.
• Unchanged: the gaps between consecutive tool rows, the status rows between replies (12/12 from Agent pane: status, tool and message rows and the action row line up with the prose #29124), the icon column, subagent rows, prompts and final replies, colours and type.

Design: leo-workspace design/chat-transcript.md (rows between replies, grouped steps); the spec gets a "Notes between tool rows" entry in a follow-up leo-workspace PR.

Gallery

agent-pane.interim-prose-gap: a running turn's opened run (a command, a note, "Ran 2 commands" opened, a note, a command). Variants: shipped (12px), tight (before, 3px), snug (8px, the message gap), roomy (16px, the turn gap). I picked 12 because it is the same room a longer reply between two runs has, so the two kinds of interim prose stay consistent; 8 is barely more than the rows' own leading, and 16 is the turn gap, which would make a note read like a turn boundary inside one run.

Verification

cd webviews && CMUX_BROWSER_TESTS=1 bun test test/transcript-interim-prose-gap.test.ts (Chromium, light and dark), on the build fleet through cmux-ci test:

• Red at the test commit 65867b8: each note had 3px above and below it (note -> Ran 2 commands: 3px, not 12px, and so on).
• Green at the fix: 12px on all four sides of the two notes, and every other gap in the run matches the tight variant.

Also on the fleet at the fix: rowEstimates.test.ts (21 pass), transcript-row-alignment.test.ts (2 pass, light and dark), and bun run check:pieces (lint, format, type check) clean.

Observed / Not run

• Observed: the fleet runs above.
• Not run: no native build or Mac capture; this is a webview CSS and estimate change.

Changelog

• Changed: Short notes between tool calls in the agent transcript have more room above and below them.

🤖 Generated with Claude Code

Agent session: agent session

---

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

---

Summary by cubic

Short notes the agent writes between tool calls in the transcript now have 12px of room above and below them, matching the spacing a longer reply between two runs already has, instead of 3px.

• Updates the note's CSS margin to use the plain status gap (--cv-note-gap, 12px) and adds gallery variants comparing 3, 8, 12, and 16px.
• Updates activityStepHeight in model.ts to estimate a note as its 20px line plus the gap on both sides.
• Adds a browser test measuring the gaps around notes in light and dark themes.

^{Written for commit 161b964. Summary will update on new commits.}

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[github-actions]

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

Review 161b964: 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=pr30400 -f ref=interim-prose-padding -f platform=macos -f backend_mode=local

Gallery before/after for 161b964: 16 states rendered, 0 images differ, 2882 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 41328087289 -R manaflow-ai/cmux -n gallery-advisory-30400-161b9647a11dbe781959b775cd440d5a63a62438 (then read gallery-review.json)

States

State	Theme	Status	Diff	Picked by
agent-pane.access-offer/turn-no-credits	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.access-offer/turn-no-credits	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.access-offer/turn-low-credits	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.access-offer/turn-low-credits	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.access-offer/turn-no-offer	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.access-offer/turn-no-offer	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.approval-edits/single	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.approval-edits/single	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.approval-edits/grouped	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.approval-edits/grouped	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.approval-edits/single-multiedit	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.approval-edits/single-multiedit	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.approval-edits/grouped-multiedit	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.approval-edits/grouped-multiedit	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.approval-edits/single-long	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.approval-edits/single-long	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.approval-edits/grouped-long	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.approval-edits/grouped-long	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/duration-columns	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/duration-columns	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/pinned-live-tail-light	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/pinned-live-tail-light	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/pinned-live-tail-dark	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/pinned-live-tail-dark	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/after-latest-message-light	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/after-latest-message-light	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/after-latest-message-dark	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/after-latest-message-dark	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/compact-pill-light	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/compact-pill-light	Apple System Colors	unchanged	0%	own conversation.css
agent-pane.background-activity/compact-pill-dark	Apple System Colors Light	unchanged	0%	own conversation.css
agent-pane.background-activity/compact-pill-dark	Apple System Colors	unchanged	0%	own conversation.css

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

Passes: CI passes on 161b9647a1.

CI passes on 161b9647a1 (run 41328087366 attempt 1).

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.

red: cmux-next checks (god files, concurrency, crash safety, l10n); base red: the same failure on the base ffcf61c; does not block

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4133598742701 (1e1948befb)
• cmux NEXT nightly 1.0.0-nightly.4133716725501 (d30463325c)
• cmux NEXT nightly 1.0.0-nightly.4133769596201 (0272db645e)
• cmux NEXT nightly 1.0.0-nightly.4133822529301 (68e3df851b)
• cmux NEXT nightly 1.0.0-nightly.4133907849701 (c2ef233b76)
• cmux NEXT nightly 1.0.0-nightly.4133963836301 (48e4448d11)
• cmux NEXT nightly 1.0.0-nightly.4134024448601 (94322a6ccf)

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/41330433296 at e0fa06f failed: cmux-next crash ends the app.
Those jobs last passed at 45b916e. This pull request is one of 5 merged since: #31133, #30400, #31145, #31066, #31069.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[cubic-dev-ai]

1 issue found across 4 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="webviews/src/agent-session/acpmux/model.ts">

<violation number="1" location="webviews/src/agent-session/acpmux/model.ts:977">
P2: This estimate assumes every short note is one line, but `mergeShortNotes` accepts up to 160 characters and `.cv-tool-note` wraps them. Compute the wrapped line count from the transcript width, including explicit line breaks, before adding the two 12px gaps; otherwise later virtual rows are initially placed too high and can jump when measured.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

View guided diff | Turn on auto-fix | Re-trigger cubic</sub>

[cubic-dev-ai]

P2: This estimate assumes every short note is one line, but mergeShortNotes accepts up to 160 characters and .cv-tool-note wraps them. Compute the wrapped line count from the transcript width, including explicit line breaks, before adding the two 12px gaps; otherwise later virtual rows are initially placed too high and can jump when measured.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At webviews/src/agent-session/acpmux/model.ts, line 977:

<comment>This estimate assumes every short note is one line, but `mergeShortNotes` accepts up to 160 characters and `.cv-tool-note` wraps them. Compute the wrapped line count from the transcript width, including explicit line breaks, before adding the two 12px gaps; otherwise later virtual rows are initially placed too high and can jump when measured.</comment>

<file context>
@@ -968,9 +968,13 @@ const TOOL_RUN_BOTTOM = 4;
 function activityStepHeight(item: AcpmuxActivity): number {
   const tool = item.tool;
-  if (!tool) return 26;
+  if (!tool) return item.kind === "note" ? NOTE_LINE + 2 * NOTE_GAP : 26;
   const mcp = mcpCall(tool);
   if (mcp) {
</file context>

[blacksmith-sh]

Found 6 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmp0a3mkopf/summary-fail.json (live):/summary-fail.json (live):	View Logs
/tmp/tmpk4t8fzyt/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 (independent Codex gpt-6.1-sol, high, via the review router; full diff from merge base 559ab05 to this head): SHIP at c041f57.

No P1/P2 findings.

[teamleaderleo]

Review (next-review patch-id; carried): SHIP at f1f3a6e

The independent SHIP at c041f57 carries to this head: the PR's own change (git diff $(git merge-base feat-cmux-next HEAD) HEAD) has the same git patch-id --verbatim (af13986da1e9fd01) at both heads, and no merge between them was resolved by hand. Nothing new to review. A newer BLOCK, or any change to the PR's own diff, ends the carry.

[teamleaderleo]

Review (codex, router-review): SHIP at f1f3a6e

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

Follow-ups: 1. Each lands as an issue in this repo that links this receipt; the lane that opened the PR fixes it forward.

SHIP at f1f3a6e

Visual verdict: Inspected all 16 supplied before/after pairs; they are identical. None show the changed note spacing.

No correctness bugs found. Tests could not run locally because Bun and dependencies are unavailable.

1. [P2] [follow-up] webviews/src/agent-session/acpmux/conversation/InterimProseGap.gallery.ts:48 — Supply light/dark captures of the note-spacing state. The provided screenshots cover unrelated states, leaving the intended visual change unverified.

Follow-ups:

• Add light/dark interim-prose-gap captures comparing shipped and tight spacing.

[cmux-bot]

cmux-bot approves f1f3a6e: 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.

[cursor]

Bugbot needs on-demand usage enabled

Bugbot uses usage-based billing for this team and requires on-demand usage to be enabled.

A team admin can enable on-demand usage in the Cursor dashboard.

[teamleaderleo]

Review (codex, router-review): SHIP at 161b964

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

Follow-ups: 1. Each lands as an issue in this repo that links this receipt; the lane that opened the PR fixes it forward.

SHIP at 161b964
Visual verdict: no images; Leo tries the build

1. [P2] [follow-up] model.ts:1042 assumes every note is one 20px line, but .cv-tool-note wraps and notes can be up to 160 characters. In a narrow pane, wrapped notes are underestimated, causing virtualized transcript rows to shift when mounted. Estimate wrapped lines or add narrow-width coverage.

Follow-ups:

• [P2] Update note height estimation for wrapped notes.