improvement(chat): shimmer active subagent and tool labels instead of spinners

[waleedlatif1]

Summary

• Extracted the ThinkingLoader label shimmer into a reusable ShimmerText primitive (components/ui), same gradient/timing/dark-mode stops, with a reduced-motion fallback
• Subagent group headers keep their agent icon and shimmer the label while the subagent is working, instead of swapping the icon for a PillsRing spinner
• Executing tool rows show their tool icon (or an outline circle when none) with a shimmering title, instead of a per-row spinner
• Expand/collapse chevron on subagent rows is now hover-revealed instead of permanently visible; rotation still indicates state
• Presentational only — no changes to segment/lane/resolve logic

Type of Change

• Improvement

Testing

Tested manually; message-content test suite passes (32 tests)

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Jul 12, 2026 1:35am

[cursor]

PR Summary

Low Risk
Presentational UI only in chat message content; no changes to streaming, lane, or resolve logic.

Overview
Chat agent group and tool call rows now signal in-progress work with shimmering labels instead of PillsRing spinners, while keeping stable icons on the left.

A shared ShimmerText primitive (components/ui) centralizes the ThinkingLoader-style gradient sweep (dark mode + prefers-reduced-motion opacity pulse via --shimmer-rest). ThinkingLoader composes that module instead of duplicating shimmer CSS.

Subagent headers always show the agent icon; the label shimmers when isWorking (delegating/unresolved or streaming with an open lane). The expand chevron is hidden until hover/focus-visible.

Executing tool rows show the tool icon (or a new outline circle fallback) with a shimmering title; completed/cancelled states are unchanged.

^{Reviewed by Cursor Bugbot for commit 8bb0808. Configure here.}

[greptile-apps]

Greptile Summary

This PR replaces spinner-based activity indicators with shimmering text labels. The main changes are:

• Adds a reusable ShimmerText UI primitive.
• Uses shimmering subagent labels while a subagent is working.
• Uses shimmering tool titles while a tool is executing.
• Keeps agent and tool icons visible instead of swapping them for spinners.
• Moves ThinkingLoader shimmer styling into the shared shimmer module.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.
• The focused chevron path now includes a keyboard focus reveal state.
• The shimmer extraction keeps styling local to the affected components.

Important Files Changed

Filename	Overview
apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/agent-group.tsx	Subagent headers now keep the agent icon, shimmer the label during active work, and reveal the chevron on hover or keyboard focus.
apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/tool-call-item.tsx	Executing tool rows now keep a tool icon or outline marker and shimmer the title text.
apps/sim/components/ui/shimmer-text.tsx	Adds the reusable ShimmerText component.
apps/sim/components/ui/shimmer-text.module.css	Defines the shared shimmer effect, dark-mode gradient, and reduced-motion fallback.
apps/sim/components/ui/thinking-loader.module.css	Composes the ThinkingLoader label shimmer from the shared shimmer module.
apps/sim/components/ui/index.ts	Exports ShimmerText from the shared UI barrel.

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[waleedlatif1]

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[waleedlatif1]

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✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 8bb0808. Configure here.}