[m1trenv0]

With legacy Plan mode on, the Build/Plan toggle sat at the far right of the composer footer next to the model and effort, and always took a labelled chip, even in the default Build mode.

The toggle now sits on the left next to the attach button. Build shows only its icon. Plan keeps its label, so you can still see at a glance that you're not in the default mode. The collapsed mobile composer has no attach slot there, so it keeps the toggle in its controls row as before. The toggle's markup moved into a small ComposerInteractionModeToggle component that both places use.

	Before	After
Build
Plan

Checked with vp run check:changed (format, lint, knip, typecheck, react compiler, nearby tests), plus a manual pass in the web dev build with Settings → Labs → Plan mode (legacy) turned on.

Made with Claude Opus 5.5 in Claude Code (T3 Code).

[macroscopeapp]

Approvability

Verdict: Approved at 7495180

Macroscope's review found this PR approvable — Repositions the existing Build/Plan toggle and shares its rendering across expanded and collapsed layouts. Mode defaults and behavior remain unchanged; the impact is limited to presentation.

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[coderabbitai]

Walkthrough

The PR adds a shared interaction-mode toggle and updates its rendering in the expanded composer footer and collapsed controls bar. The toggle displays mode-specific controls and invokes the supplied callback when clicked.

Changes: Composer interaction-mode toggle

Layer / File(s)	Summary
Shared toggle component and footer integration apps/web/src/components/chat/ComposerInteractionModeToggle.tsx, apps/web/src/components/chat/ComposerFooterControls.tsx	The new shared component renders mode-specific icons, labels, tooltip text, and accessible text. The footer passes the current interaction mode and toggle callback to it.
Expanded and collapsed composer placement apps/web/src/components/chat/ChatComposer.tsx, apps/web/src/components/chat/ComposerControlsBar.tsx	The expanded footer places the toggle beside attachments when Plan UI is enabled. In collapsed controls, the controls bar owns and displays the toggle under the updated visibility conditions.

Priority: Low

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

Change: Feature

Possibly related PRs

• pingdotgg/t3code#24837: Updates interaction-mode toggle rendering and visibility in the composer footer.
• pingdotgg/t3code#25869: Changes ownership and placement of composer interaction-mode controls.
• pingdotgg/t3code#26777: Places a composer toggle beside the attachment button using the expanded-footer wrapper.

Suggested reviewers: juliusmarminge, macroscopeapp

Merge Risk: Minimal · up to 74951

The toggle moves beside attachments while remaining in the compact controls on mobile. No merge-blocking risk was identified.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary change: moving the Build/Plan toggle beside the attach button.
Description check		The description explains the problem and change, includes before/after screenshots, and documents focused checks and manual verification. It does not include a separate Scope and approval section, but…
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 explains the problem and change, includes before/after screenshots, and documents focused checks and manual verification. It does not include a separate Scope and approval section, but the description is otherwise sufficiently complete and directly related to the changes.

Finishing Touches

🧪 Generate unit tests (beta)

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[maria-rcks]

Note

Written by gpt-6.1-sol on behalf of Maria

This intentional composer design change needs prior approval. The diff moves the Build/Plan toggle beside Attach and removes the visible Build label; the description explains the preferred layout but establishes no broken behavior and links no maintainer approval. Please obtain approval of the placement and labeling direction and scope, link it, and request reconsideration. The screenshots and checks establish the proposed appearance but do not replace approval.