[devswha]

Change

Maintainer decision: keep the chat composer minimal. The composer's New tab with an agent… icon button (#1512, beside the mic, desktop only) is now off by default. It shows only after this device turns it on in Settings. The same New tab dialog is still reachable from the tab menu, New tab, and the workspace menu, and the dialog itself is unchanged.

• New device setting composerNewTabButton (src/lib/settings.ts): default false, boolean-checked in sanitizeSettings, device scope (not shared between browsers), and left out of the telemetry snapshot like followHerdrFocus.
• Settings → Chat → Composer gets a New tab button toggle below Send queued messages automatically. The toggle appears only in a mouse-driven window: a touch screen never shows the button, so it doesn't offer the toggle. The label and description are in English, Korean, Japanese and Chinese.
• Composer.tsx draws the button only when the setting is on. Nothing else in the composer changes.
• feat(chat): start an agent with its model, effort and skills from Chat #1512 is unreleased (git tag --contains 7cd3648c lists nothing), so this edits its fragment, changelog.d/new-session-skills.md, to say the button is opt-in from Settings instead of adding a new entry. DESIGN.md's New tab and Settings dialog entries say the same and name the precedent: the Codex and Claude apps keep their composer row to attach and the mic, and start a new thread from the sidebar.

Validation

• bun run check fast: exit 0 on the pushed head (4448f15): workflow syntax, generated types and themes, typecheck, build, and unit tests (5818 pass, 0 fail, 8 skip). An earlier run exited 1 only because server/session-history.test.ts › "never reads a crashed writer's uncommitted change from a rollback-journal store" timed out under a load average of about 41–45. That test fails on main too (the merge pass reproduced the timeout on main alone), so it is unrelated to this branch and is being fixed separately.
• src/lib/settings.test.ts: a new test covers the default (off), the boolean check, the device scope, and absence from SHARED_SETTING_KEYS.
• bun scripts/new-session-skills-browser-qa.ts (in CI's browser lane): exit 0, 7/7 scenarios pass. A new first scenario opens the demo on a desktop with nothing stored and checks that the composer has no .composer-new-session. It then turns the toggle on through Settings (?settings=chat&section=composer) and checks that the button appears and opens the dialog. The phone scenario now checks that a phone's card has no button even with the setting on.
• Demo screenshots at 1280×800, light and dark, show the composer off and on, plus the Settings toggle off, then on. On the phone's Composer group, getByRole("switch", { name: "New tab button" }) counts 0. I checked the screenshots by eye: turning the setting on only inserts the button between the mic and the plan chip.

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📝 Summary

Summary by CodeRabbit

• New Features

  • Added an optional desktop-only “New tab button” for launching an agent tab from the composer.
  • The button is disabled by default and can be enabled under Settings → Chat → Composer.
  • The tab menu remains available on all devices, while the new button is unavailable on touch devices.
  • Added Japanese, Korean, and Simplified Chinese translations for the setting.

• Tests

  • Added coverage for default behavior, device-specific settings, and desktop/mobile availability.

The composer’s New tab button is disabled by default and controlled by a device-local setting. The setting and button are omitted on touch devices. When enabled, eligible desktop composers show the button; the tab menu can still open the launch dialog.

Changes: Composer New Tab Button

Layer / File(s)	Summary
Device-local setting contract src/lib/settings.ts, src/lib/settings.test.ts, src/lib/settings.legacy-fixture.ts	Adds composerNewTabButton with a false default, boolean sanitization, and device-local scope. The setting is excluded from shared settings and telemetry. Tests cover these properties.
Settings and composer integration src/components/SettingsDialog.tsx, src/components/Composer.tsx, src/lib/i18n.*.ts, scripts/new-session-skills-browser-qa.ts, DESIGN.md, changelog.d/new-session-skills.md	Adds a non-touch Settings toggle and gates the composer button on the setting. Browser QA covers the default-off state, enabling the button, opening and canceling the dialog, and its absence on phones. The design, changelog, and translations describe the setting and button.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Possibly related issues

• devswha/herdr-web-ui#1546 — The changelog entry now describes the Composer setting that gates the New tab button.

Suggested reviewers: haeminway1

Merge Risk: 🔵 Low · up to 4448f

Users can enable the setting without seeing the New tab button in narrow desktop windows.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: the composer's New tab button is shown only when enabled in Settings.
Description check		The description follows the required Change and Validation sections. It explains the behavior, setting scope, affected devices, documentation updates, tests, browser QA, and reported validation result…
Docstring Coverage		Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 9 files. (2 skipped: 2 u…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description follows the required Change and Validation sections. It explains the behavior, setting scope, affected devices, documentation updates, tests, browser QA, and reported validation results.

Full details: Docstring Coverage

Explanation

Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 9 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/components/SettingsDialog.tsx:
- Line 376: Update the toggle visibility condition in the SettingsDialog render
near {!touch && ...} to match the Composer button’s media-query visibility logic
at its corresponding button locations, including the 640px boundary, so the
setting is shown only when the button is available.

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📥 Commits

Reviewing files that changed from the base of the PR and between 90b66e8 and 4448f15.

📒 Files selected for processing: 11

• DESIGN.md
• changelog.d/new-session-skills.md
• scripts/new-session-skills-browser-qa.ts
• src/components/Composer.tsx
• src/components/SettingsDialog.tsx
• src/lib/i18n.ja.ts
• src/lib/i18n.ko.ts
• src/lib/i18n.zh.ts
• src/lib/settings.legacy-fixture.ts
• src/lib/settings.test.ts
• src/lib/settings.ts

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[devswha]

Merge pass: CodeRabbit reviewed 4448f15; its one thread is fixed in 3557e95 and resolved. CodeRabbit did not re-review 3557e95. This merges on omo-native-code-reviewer and Codex (gpt-6-astra), both PASS on 3557e95, and required CI on GitHub-hosted runners.