[teamleaderleo]

When the host offers tabRow.nativeRowTools: true with a positive row height, the chat's quick-action icons and Session Info/Summary toggle are described to the native tab-row host. A shared button list supplies both DOM and native labels, symbols, visibility, toggle state and callbacks. The opt-in remains off by default. This web half lands after the native implementation in #27133 and coordinator clearance.

Leo, 2026-10-29:

"speaking of that top right buttons section area thing, okay, what do you think about moving it into Swift? Like just going more native with it? Because I just feel like on my fing God, I've ran into so many fing different hacks and stuff just to get this nonsense working. ... we keep running into this nonsense, right? ... And then we could just RPC it or whatever the f*** into TypeScript sometimes. But I feel like, okay, more native buttons and stuff, maybe that might be nicer."

The page calls pane.tabRowTools.set through callNative with {tools: [{id, symbol, label, enabled, toggled}]}. tabRowToolInvoked {id, menuItemId?} arrives through cmux.agent.host.events and dispatches the shared callbacks. These buttons have no native menus; unknown ids, disabled tools and menu-item invocations do nothing. Labels are bounded to 64 characters and lists to 16 tools.

Values are deduplicated, so callback identity changes and token renders do not resend tools. Hiding/unmounting the header or disabling the opt-in clears the list and unregisters dispatch. A rejected host update restores the web buttons. No timers, polling, observers, animation loops or per-token RPCs are added.

Scope: quick actions plus Inspector/Summary only. Summary has no badge today; none is invented. Needs You retains its web button and correctly anchored rich popover (Allow/Deny/choices, Go to source, Ask about this); its native migration belongs to a later step. PR chip, worktree pill, presence, status, chat menu and clearance CSS are unchanged. Existing automation can still open Summary while its visible toggle is native.

The change is kept together because extracting the shared action list, its host bridge, and the native/off lifecycle tests establish one dispatch path; splitting the extraction from the consumer would leave the behavior invariant untested.

Risk: normal — opt-in web/native action routing. No default changes. The native renderer and tunable ship in #27133; this PR does not claim native appearance evidence.

Validation:

• Local Node 24 web lint passes; 19 focused tests pass (228 assertions).
• List/dispatch tests cover ids, shared SF Symbols, toggled/enabled state, absent Summary badge, all handlers, malformed events, value deduplication, current callbacks, off/hidden/unmount cleanup and failed-host recovery.
• The real header switches through page-level tabRow events and invokes Terminal/Summary through tabRowToolInvoked; web clicks use the same callbacks. Removing either the flag parser or invocation routing makes this regression fail. Native mode hides migrated DOM buttons, restoring them when disabled.
• Existing header behavior tests cover Browser/Preview routing, Changes, Files, Split Down, tooltips and customization.
• Gallery native-row-off/native-row-tools, light and dark: the web icons disappear only with native opt-in; Needs You and the chat menu remain.
• Combined exact-head lint and tests: run 40794610520, PASS: full web lint and all 19 tests / 228 assertions at 2af5d59e4175c09ce60921135c1edef38259bb00. This update strengthens the host-event regression without product changes.
• Independent Astra review: SHIP at 2af5d59e4175c09ce60921135c1edef38259bb00, including the page-level host-event regression.

Gallery comparison: native opt-in off/on in the same header fixture. The after image shows the remaining web controls; native icons are rendered by the separate native PR.

Theme	Before (off)	After (native on)
Dark
Light

Agent session: agent session

[github-actions]

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

Review e749d7d: 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=pr27135 -f ref=lane/orch-native-tools-b -f platform=macos -f backend_mode=local

Unclear: web / react-apps-check failed: no known signature; failed step: Check webview test shards.

CI failed on e749d7dc56 (run 41073290488 attempt 1): 1 code, 1 unknown.

Job	Verdict	Why
web / react-apps-base-check (3)	code	a web test failed
web / react-apps-check	unknown	no known signature; failed step: Check webview test shards

Failures:

• seen on other PRs motion-scale.test.ts motion scale > no webview CSS, TS or TSX animates off the scale: failed (job)
• seen on other PRs reasoning-chip-steps.test.ts New Tab at 300 px: the model button's effort reads "Med" whole: failed (job)

Matched log lines

web / react-apps-base-check (3): (fail) motion scale > no webview CSS, TS or TSX animates off the scale [746.72ms]

Not re-run automatically: web / react-apps-base-check (3), web / react-apps-check are not machine failures.

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: web / Web status; base red: the same failure on the base f287294; does not block
red: web / react-apps-base-check (3); no finished base run on f287294 to compare; do not merge until green; see lane-rules
red: web / react-apps-check; base red: the same failure on the base f287294; does not block

Gallery before/after for e749d7d: 16 states rendered, 0 images differ, 2481 more touched states not rendered. Images are in the run's artifact, not on this public PR.

gh run download 41073290708 -R manaflow-ai/cmux -n gallery-advisory-27135-e749d7dc56b51bc2108bddb46153395dc9df1b57 (then read gallery-review.json)

States

State	Theme	Status	Diff	Picked by
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.continuation-spacing/shipped	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/shipped	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/two-thirds	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/two-thirds	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/half-tucked	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/half-tucked	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/before	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.continuation-spacing/before	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.copy-controls/output	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.copy-controls/output	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.docked-chat/new-chat	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.docked-chat/new-chat	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.docked-chat/after-turn	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.docked-chat/after-turn	Apple System Colors	unchanged	0%	own App.tsx
agent-pane.docked-chat/working	Apple System Colors Light	unchanged	0%	own App.tsx
agent-pane.docked-chat/working	Apple System Colors	unchanged	0%	own App.tsx

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

[teamleaderleo]

Review (Astra): SHIP at 8697d78

The seven-line test-only delta correctly initializes and clears shared quick-action and lit state. Earlier product review still applies; no new findings.

[teamleaderleo]

Bead cx-qldau1 created for this PR by the cmux coordinator.

[teamleaderleo]

Review (Astra): SHIP at 2af5d59

[teamleaderleo]

Orphaned: no activity for 13 h, and no lane holds a lease on it. The orphan sweep could not merge feat-cmux-next in: conflicts in webviews/src/agent-session/acpmux/inspector/ChatInspector.tsx. Listed for a lane to resolve.

[blacksmith-sh]

Found 4 test failures on Blacksmith runners:

Failures

Test	View Logs
test/motion-scale.test.ts/motion-scale.test	View Logs
test/motion-scale.test.ts/motion-scale.test	View Logs
test/reasoning-chip-steps.test.ts/reasoning-chip-steps.test	View Logs
test/reasoning-chip-steps.test.ts/reasoning-chip-steps.test	View Logs

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

[teamleaderleo]

Review (codex gpt-6-astra): SHIP at e749d7d

No P1/P2/P3 findings. Full review of the PR against feat-cmux-next 570b452 (merge base f287294, which includes the native half #27133). The review box's target is pinned to head e749d7d. In the reviewer's words: "The native descriptor protocol, host-event dispatch, fallback behavior, stale callback handling, and existing header behavior align with the native Swift implementation and added tests." Scope: the message and field contract against the Swift host and policy.json; the opt-in off and zero-height paths; no duplicate or missing buttons; toggle sync; stale callbacks; cleanup on unmount; and the merge resolution in react-pages.md and the header gallery.

CI at this head (run 41075450537): bun test test/native-row-tools.test.tsx test/chat-header-lit.test.tsx: 7 pass, 0 fail.

Base reds, not from this PR, which changes no Swift, policy or latency files:

• cmux-agent-pane-policy the_known_params_are_the_macos_hosts: acp.session.fork live is in Swift (d6c70e6) but not in policy.json. It fails the same way on the base tree (run 41075890156), and the fix is open as agent-pane-policy: allow acp.session.fork's live param (base red from d6c70e66) #28332.
• tsc: test/latency/probe.ts(115,60) interactionId.

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4108273398901 (4ab956c562)
• cmux NEXT nightly 1.0.0-nightly.4108444840601 (fb33c09a23)
• cmux NEXT nightly 1.0.0-nightly.4108762076801 (8e3aaa2401)