openchamber/.agents/skills/theme-system/SKILL.md

name, description, license, compatibility

name	description	license	compatibility
theme-system	Use when creating or modifying UI components, styling, visual elements, or icons in OpenChamber. All UI colors must use theme tokens - never hardcoded values or Tailwind color classes. All icons must use the shared Icon component from the SVG sprite system - never import from @remixicon/react directly.	MIT	opencode

Overview

OpenChamber uses a JSON-based theme system. Themes are defined in packages/ui/src/lib/theme/themes/. Users can also add custom themes via ~/.config/openchamber/themes/.

Core principle: UI colors must use theme tokens - never hardcoded hex colors or Tailwind color classes.

When to Use

• Creating or modifying UI components
• Working with colors, backgrounds, borders, or text
• Working with icons — adding, changing, or creating icon usages

Quick Decision Tree

1. Code display? → syntax.*
2. Feedback/status? → status.*
3. Primary CTA? → primary.*
4. Interactive/clickable? → interactive.*
5. Background layer? → surface.*
6. Text? → surface.foreground or surface.mutedForeground

Critical Rules

• surface.elevated = inputs, cards, panels
• interactive.hover = ONLY on clickable elements
• interactive.selection = active/selected states (not primary!)
• Status colors = ONLY for actual feedback (errors, warnings, success)
• Input footers = bg-transparent on elevated background

Button Rules (MANDATORY)

Use only the shared Button component from packages/ui/src/components/ui/button.tsx.

• Do not create wrapper button components (for example ButtonLarge, ButtonSmall).
• Do not hardcode button height/padding classes when a size variant exists.
• Use semantic button variants consistently; avoid ad-hoc one-off button styling.

Allowed Button Variants

Variant	Use for	Token direction
default	Primary action in a local section/dialog	primary.*
outline	Secondary visible action	surface.elevated + interactive.*
secondary	Soft secondary action	interactive.hover / interactive.active
ghost	Low-emphasis row/toolbar action	transparent + interactive.hover
destructive	Destructive actions (Delete, Revert all)	status.error*
link	Rare inline text action only	text-link style

Allowed Button Sizes

Size	Use for
xs	Dense controls in rows/lists
sm	Default compact action buttons
default	Standard form/page actions
lg	Prominent large actions
icon	Icon-only square button

Button Selection Quick Guide

1. Main CTA in section/dialog -> default
2. Side action next to CTA -> outline
3. Quiet auxiliary action -> ghost
4. Dangerous action -> destructive
5. Tiny row action -> keep same variant, set size="xs"

Never Use

• Hardcoded hex colors (#FF0000)
• Tailwind colors (bg-white, text-blue-500, bg-gray-*)
• Deprecated: bg-secondary, bg-muted

Usage

Via Hook

import { useThemeSystem } from '@/contexts/useThemeSystem';
const { currentTheme } = useThemeSystem();

<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>

Via CSS Variables

<div className="bg-[var(--surface-elevated)] hover:bg-[var(--interactive-hover)]">

Color Tokens

Surface Colors

Token	Usage
surface.background	Main app background
surface.elevated	Inputs, cards, panels, popovers
surface.muted	Secondary backgrounds, sidebars
surface.foreground	Primary text
surface.mutedForeground	Secondary text, hints
surface.subtle	Subtle dividers

Interactive Colors

Token	Usage
interactive.border	Default borders
interactive.hover	Hover on clickable elements only
interactive.selection	Active/selected items
interactive.selectionForeground	Text on selection
interactive.focusRing	Focus indicators

Status Colors

Token	Usage
status.error	Errors, validation failures
status.warning	Warnings, cautions
status.success	Success messages
status.info	Informational messages

Each has variants: *, *Foreground, *Background, *Border.

Primary Colors

Token	Usage
primary.base	Primary CTA buttons
primary.hover	Hover on primary elements
primary.foreground	Text on primary background

Primary vs Selection: Primary = "click me" (CTA), Selection = "currently active" (state).

Syntax Colors

For code display only. Never use for UI elements.

Token	Usage
syntax.base.background	Code block background
syntax.base.foreground	Default code text
syntax.base.keyword	Keywords
syntax.base.string	Strings
syntax.highlights.diffAdded	Added lines
syntax.highlights.diffRemoved	Removed lines

Examples

Input Area

const { currentTheme } = useThemeSystem();

<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <textarea className="bg-transparent" />
  <div className="bg-transparent">{/* Footer - transparent! */}</div>
</div>

Active Tab

<button className={isActive 
  ? 'bg-interactive-selection text-interactive-selection-foreground'
  : 'hover:bg-interactive-hover/50'
}>

Error Message

<div style={{ 
  color: currentTheme.colors.status.error,
  backgroundColor: currentTheme.colors.status.errorBackground 
}}>

Card

<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <h3 style={{ color: currentTheme.colors.surface.foreground }}>Title</h3>
  <p style={{ color: currentTheme.colors.surface.mutedForeground }}>Description</p>
</div>

Icon System (MANDATORY)

OpenChamber uses an SVG sprite-based icon system. Never import from @remixicon/react. Always use the shared Icon component.

Import

import { Icon } from "@/components/icon/Icon";
import type { IconName } from "@/components/icon/icons";

Usage

<Icon name="arrow-down-s" className="h-4 w-4" />
<Icon name="loader-4" className="size-4 animate-spin" />

Naming Convention

Convert Remixicon component names to kebab-case sprite names:

1. Strip Ri prefix
2. Strip Line suffix
3. Convert PascalCase to kebab-case
4. Lowercase everything

Remixicon	Sprite name
RiArrowDownSLine	arrow-down-s
RiCheckLine	check
RiLoader4Line	loader-4
RiGithubFill	github-fill
RiBrainAi3Line	brain-ai-3

Fill Variants

For filled (solid) icon variants, append -fill explicitly. The generator tries Line suffix first, then Fill, then bare name.

<Icon name="github-fill" />   {/* RiGithubFill */}
<Icon name="github" />        {/* RiGithubLine (default) */}

Sizing

The Icon component has no size prop. Use Tailwind classes:

<Icon name="check" className="h-4 w-4" />     {/* 16px - most common */}
<Icon name="check" className="size-5" />        {/* 20px */}
<Icon name="check" className="h-3 w-3" />       {/* 12px */}

Adding a New Icon (Workflow)

In order:

1. Use the icon in code with the correct kebab-case name:

   <Icon name="new-icon-name" className="h-4 w-4" />
   

2. If used as a value (not JSX), use IconName type:

   const config = { icon: "new-icon-name" as const };
   

3. Regenerate the sprite:

   bun run icons:generate
   

4. The script scans all source files, reverse-maps to Remixicon names, extracts SVG paths, and regenerates sprite.ts.

5. Verify: bun run type-check

Do NOT manually edit sprite.ts. Always regenerate.

Type Safety for Icon Values

When icons are stored in objects/arrays, change the type from ComponentType to IconName and render via <Icon name={value} />:

// ❌ Old: component reference
const items = [{ icon: RiStackLine }];
return <items[0].icon className="h-4 w-4" />;

// ✅ New: IconName string
import type { IconName } from "@/components/icon/icons";
const items: { icon: IconName }[] = [{ icon: "stack" }];
return <Icon name={items[0].icon} className="h-4 w-4" />;

Wrong vs Right

Wrong

// ❌ Importing from @remixicon/react
import { RiArrowDownSLine } from "@remixicon/react";
<RiArrowDownSLine className="h-4 w-4" />

// ❌ Hardcoded colors
<div style={{ backgroundColor: '#F2F0E5' }}>
<button className="bg-blue-500">

// Primary for active tab
<Tab className="bg-primary">Active</Tab>

// Hover on static element
<div className="hover:bg-interactive-hover">Static card</div>

// Colored footer on input
<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <textarea />
  <div style={{ backgroundColor: currentTheme.colors.surface.muted }}>Footer</div>
</div>

Right

// ✅ Using the Icon component
import { Icon } from "@/components/icon/Icon";
<Icon name="arrow-down-s" className="h-4 w-4" />

// Theme tokens
<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
<button style={{ backgroundColor: currentTheme.colors.primary.base }}>

// Selection for active tab
<Tab style={{ backgroundColor: currentTheme.colors.interactive.selection }}>Active</Tab>

// Hover only on clickable
<button className="hover:bg-[var(--interactive-hover)]">Click</button>

// Transparent footer
<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <textarea className="bg-transparent" />
  <div className="bg-transparent">Footer</div>
</div>

References

• Adding Themes - Built-in and custom themes

Key Files

• Theme types: packages/ui/src/types/theme.ts
• Theme hook: packages/ui/src/contexts/useThemeSystem.ts
• CSS generator: packages/ui/src/lib/theme/cssGenerator.ts
• Built-in themes: packages/ui/src/lib/theme/themes/
• Icon component: packages/ui/src/components/icon/Icon.tsx
• Icon sprite data: packages/ui/src/components/icon/sprite.ts (auto-generated)
• Icon types: packages/ui/src/components/icon/icons.ts
• Icon sprite generator: scripts/generate-icon-sprite.mjs
• Icon docs: packages/ui/src/components/icon/README.md